code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2019 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019, 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer parted)
  #:use-module (gnu installer steps)
  #:use-module (gnu installer utils)
  #:use-module (gnu installer newt page)
  #:use-module (gnu system uuid)
  #:use-module ((gnu build file-systems)
                #:select (read-partition-uuid
                          read-luks-partition-uuid))
  #:use-module ((gnu build linux-modules)
                #:select (missing-modules))
  #:use-module ((gnu system linux-initrd)
                #:select (%base-initrd-modules))
  #:use-module (guix build syscalls)
  #:use-module (guix build utils)
  #:use-module (guix records)
  #:use-module (guix utils)
  #:use-module (guix i18n)
  #:use-module (parted)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:use-module (rnrs io ports)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:export (<user-partition>
            user-partition
            make-user-partition
            user-partition?
            user-partition-name
            user-partition-type
            user-partition-file-name
            user-partition-disk-file-name
            user-partition-crypt-label
            user-partition-crypt-password
            user-partition-fs-type
            user-partition-bootable?
            user-partition-esp?
            user-partition-bios-grub?
            user-partition-size
            user-partition-start
            user-partition-end
            user-partition-mount-point
            user-partition-need-formatting?
            user-partition-parted-object

            find-esp-partition
            small-freespace-partition?
            esp-partition?
            boot-partition?
            default-esp-mount-point

            with-delay-device-in-use?
            force-device-sync
            non-install-devices
            partition-user-type
            user-fs-type-name
            partition-filesystem-user-type
            partition-get-flags
            partition->user-partition
            create-special-user-partitions
            find-user-partition-by-parted-object

            device-description
            partition-end-formatted
            partition-print-number
            partition-description
            partitions-descriptions
            user-partition-description

            &max-primary-exceeded
            max-primary-exceeded?
            &extended-creation-error
            extended-creation-error?
            &logical-creation-error
            logical-creation-error?

            can-create-partition?
            mklabel
            mkpart
            rmpart

            auto-partition!

            &no-root-mount-point
            no-root-mount-point?

            check-user-partitions
            set-user-partitions-file-name
            format-user-partitions
            mount-user-partitions
            umount-user-partitions
            with-mounted-partitions
            user-partitions->file-systems
            user-partitions->configuration

            init-parted
            free-parted))

;;;
;;; Partition record.
;;;

(define-record-type* <user-partition>
  user-partition make-user-partition
  user-partition?
  (name                 user-partition-name ;string
                        (default #f))
  (type                 user-partition-type
                        (default 'normal)) ; 'normal | 'logical | 'extended
  (file-name            user-partition-file-name
                        (default #f))
  (disk-file-name       user-partition-disk-file-name
                        (default #f))
  (crypt-label          user-partition-crypt-label
                        (default #f))
  (crypt-password       user-partition-crypt-password
                        (default #f))
  (fs-type              user-partition-fs-type
                        (default 'ext4))
  (bootable?            user-partition-bootable?
                        (default #f))
  (esp?                 user-partition-esp?
                        (default #f))
  (bios-grub?           user-partition-bios-grub?
                        (default #f))
  (size                 user-partition-size
                        (default #f))
  (start                user-partition-start ;start as string (e.g. '11MB')
                        (default #f))
  (end                  user-partition-end ;same as start
                        (default #f))
  (mount-point          user-partition-mount-point ;string
                        (default #f))
  (need-formatting?     user-partition-need-formatting? ; boolean
                        (default #f))
  (parted-object        user-partition-parted-object ; <partition> from parted
                        (default #f)))

;;
;; Utilities.
;;

(define (find-esp-partition partitions)
  "Find and return the ESP partition among PARTITIONS."
  (find esp-partition? partitions))

(define* (small-freespace-partition? device
                                     partition
                                     #:key (max-size MEBIBYTE-SIZE))
  "Return #t is PARTITION is a free-space partition with less a size strictly
inferior to MAX-SIZE, #f otherwise."
  (let ((size (partition-length partition))
        (max-sector-size (/ max-size
                            (device-sector-size device))))
    (< size max-sector-size)))

(define (partition-user-type partition)
  "Return the type of PARTITION, to be stored in the TYPE field of
<user-partition> record. It can be 'normal, 'extended or 'logical."
  (cond ((normal-partition? partition)
         'normal)
        ((extended-partition? partition)
         'extended)
        ((logical-partition? partition)
         'logical)
        (else #f)))

(define (esp-partition? partition)
  "Return #t if partition has the ESP flag, return #f otherwise."
  (let* ((disk (partition-disk partition))
         (disk-type (disk-disk-type disk))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED)))
    (and (data-partition? partition)
         (not has-extended?)
         (partition-is-flag-available? partition PARTITION-FLAG-ESP)
         (partition-get-flag partition PARTITION-FLAG-ESP))))

(define (boot-partition? partition)
  "Return #t if partition has the boot flag, return #f otherwise."
  (and (data-partition? partition)
       (partition-is-flag-available? partition PARTITION-FLAG-BOOT)
       (partition-get-flag partition PARTITION-FLAG-BOOT)))

;; The default mount point for ESP partitions.
(define default-esp-mount-point
  (make-parameter "/boot/efi"))

(define (efi-installation?)
  "Return #t if an EFI installation should be performed, #f otherwise."
  (file-exists? "/sys/firmware/efi"))

(define (user-fs-type-name fs-type)
  "Return the name of FS-TYPE as specified by libparted."
  (case fs-type
    ((ext4)  "ext4")
    ((btrfs) "btrfs")
    ((fat16) "fat16")
    ((fat32) "fat32")
    ((jfs)   "jfs")
    ((ntfs)  "ntfs")
    ((swap)  "linux-swap")))

(define (user-fs-type->mount-type fs-type)
  "Return the mount type of FS-TYPE."
  (case fs-type
    ((ext4)  "ext4")
    ((btrfs) "btrfs")
    ((fat16) "fat")
    ((fat32) "vfat")
    ((jfs)   "jfs")
    ((ntfs)  "ntfs")))

(define (partition-filesystem-user-type partition)
  "Return the filesystem type of PARTITION, to be stored in the FS-TYPE field
of <user-partition> record."
  (let ((fs-type (partition-fs-type partition)))
    (and fs-type
         (let ((name (filesystem-type-name fs-type)))
           (cond
            ((string=? name "ext4") 'ext4)
            ((string=? name "btrfs") 'btrfs)
            ((string=? name "fat16") 'fat16)
            ((string=? name "fat32") 'fat32)
            ((string=? name "jfs") 'jfs)
            ((string=? name "ntfs") 'ntfs)
            ((or (string=? name "swsusp")
                 (string=? name "linux-swap(v0)")
                 (string=? name "linux-swap(v1)"))
             'swap)
            (else
             (error (format #f "Unhandled ~a fs-type~%" name))))))))

(define (partition-get-flags partition)
  "Return the list of flags supported by the given PARTITION."
  (filter-map (lambda (flag)
                (and (partition-get-flag partition flag)
                     flag))
              (partition-flags partition)))

(define (partition->user-partition partition)
  "Convert PARTITION into a <user-partition> record and return it."
  (let* ((disk (partition-disk partition))
         (device (disk-device disk))
         (disk-type (disk-disk-type disk))
         (has-name? (disk-type-check-feature
                     disk-type
                     DISK-TYPE-FEATURE-PARTITION-NAME))
         (name (and has-name?
                    (data-partition? partition)
                    (partition-get-name partition))))
    (user-partition
     (name (and (and name
                     (not (string=? name "")))
                name))
     (type (or (partition-user-type partition)
               'normal))
     (file-name (partition-get-path partition))
     (disk-file-name (device-path device))
     (fs-type (or (partition-filesystem-user-type partition)
                  'ext4))
     (mount-point (and (esp-partition? partition)
                       (default-esp-mount-point)))
     (bootable? (boot-partition? partition))
     (esp? (esp-partition? partition))
     (parted-object partition))))

(define (create-special-user-partitions partitions)
  "Return a list with a <user-partition> record describing the ESP partition
found in PARTITIONS, if any."
  (filter-map (lambda (partition)
                (and (esp-partition? partition)
                     (partition->user-partition partition)))
              partitions))

(define (find-user-partition-by-parted-object user-partitions
                                              partition)
  "Find and return the <user-partition> record in USER-PARTITIONS list which
PARTED-OBJECT field equals PARTITION, return #f if not found."
  (find (lambda (user-partition)
          (equal? (user-partition-parted-object user-partition)
                  partition))
        user-partitions))

;;
;; Devices
;;

(define (with-delay-device-in-use? file-name)
  "Call DEVICE-IN-USE? with a few retries, as the first re-read will often
fail. See rereadpt function in wipefs.c of util-linux for an explanation."
  ;; Kernel always return EINVAL for BLKRRPART on loopdevices.
  (and (not (string-match "/dev/loop*" file-name))
       (let loop ((try 4))
         (usleep 250000)
         (let ((in-use? (device-in-use? file-name)))
           (if (and in-use? (> try 0))
               (loop (- try 1))
               in-use?)))))

(define* (force-device-sync device)
  "Force a flushing of the given DEVICE."
  (device-open device)
  (device-sync device)
  (device-close device))

(define (remove-logical-devices)
  "Remove all active logical devices."
  (with-null-output-ports
   (invoke "dmsetup" "remove_all")))

(define (non-install-devices)
  "Return all the available devices, except the busy one, allegedly the
install device. DEVICE-IS-BUSY? is a parted call, checking if the device is
mounted. The install image uses an overlayfs so the install device does not
appear as mounted and won't be considered as busy. So use also DEVICE-IN-USE?
from (guix build syscalls) module, who will try to re-read the device's
partition table to determine whether or not it is already used (like sfdisk
from util-linux)."
  (remove (lambda (device)
            (let ((file-name (device-path device)))
              (or (device-is-busy? device)
                  (with-delay-device-in-use? file-name))))
          (devices)))

;;
;; Disk and partition printing.
;;

(define* (device-description device #:optional disk)
  "Return a string describing the given DEVICE."
  (let* ((type (device-type device))
         (file-name (device-path device))
         (model (device-model device))
         (type-str (device-type->string type))
         (disk-type (if disk
                        (disk-disk-type disk)
                        (disk-probe device)))
         (length (device-length device))
         (sector-size (device-sector-size device))
         (end (unit-format-custom-byte device
                                       (* length sector-size)
                                       UNIT-GIGABYTE)))
    (string-join
     `(,@(if (string=? model "")
             `(,type-str)
             `(,model ,(string-append "(" type-str ")")))
       ,file-name
       ,end
       ,@(if disk-type
             `(,(disk-type-name disk-type))
             '()))
     " ")))

(define (partition-end-formatted device partition)
  "Return as a string the end of PARTITION with the relevant unit."
  (unit-format-byte
   device
   (-
    (* (+ (partition-end partition) 1)
       (device-sector-size device))
    1)))

(define (partition-print-number partition)
  "Convert the given partition NUMBER to string."
  (let ((number (partition-number partition)))
    (number->string number)))

(define (partition-description partition user-partition)
  "Return a string describing the given PARTITION, located on the DISK of
DEVICE."

  (define (partition-print-type partition)
    "Return the type of PARTITION as a string."
    (if (freespace-partition? partition)
        (G_ "Free space")
        (let ((type (partition-type partition)))
          (match type
            ((type-symbol)
             (symbol->string type-symbol))))))

  (define (partition-print-flags partition)
    "Return the flags of PARTITION as a string of comma separated flags."
    (string-join
     (filter-map
      (lambda (flag)
        (and (partition-get-flag partition flag)
             (partition-flag-get-name flag)))
      (partition-flags partition))
     ","))

  (define (maybe-string-pad string length)
    "Returned a string formatted by padding STRING of LENGTH characters to the
right. If STRING is #f use an empty string."
    (if (and string (not (string=? string "")))
        (string-pad-right string length)
        ""))

  (let* ((disk (partition-disk partition))
         (device (disk-device disk))
         (disk-type (disk-disk-type disk))
         (has-name? (disk-type-check-feature
                     disk-type
                     DISK-TYPE-FEATURE-PARTITION-NAME))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED))
         (part-type (partition-print-type partition))
         (number (and (not (freespace-partition? partition))
                      (partition-print-number partition)))
         (name (and has-name?
                    (if (freespace-partition? partition)
                        (G_ "Free space")
                        (partition-get-name partition))))
         (start (unit-format device
                             (partition-start partition)))
         (end (partition-end-formatted device partition))
         (size (unit-format device (partition-length partition)))
         (fs-type (partition-fs-type partition))
         (fs-type-name (and fs-type
                            (filesystem-type-name fs-type)))
         (crypt-label (and user-partition
                           (user-partition-crypt-label user-partition)))
         (flags (and (not (freespace-partition? partition))
                     (partition-print-flags partition)))
         (mount-point (and user-partition
                           (user-partition-mount-point user-partition))))
    `(,(or number "")
      ,@(if has-extended?
            (list part-type)
            '())
      ,size
      ,(or fs-type-name "")
      ,(or flags "")
      ,(or mount-point "")
      ,(or crypt-label "")
      ,(maybe-string-pad name 30))))

(define (partitions-descriptions partitions user-partitions)
  "Return a list of strings describing all the partitions found on
DEVICE. METADATA partitions are not described. The strings are padded to the
right so that they can be displayed as a table."

  (define (max-length-column lists column-index)
    "Return the maximum length of the string at position COLUMN-INDEX in the
list of string lists LISTS."
    (apply max
           (map (lambda (list)
                  (string-length
                   (list-ref list column-index)))
                lists)))

  (define (pad-descriptions descriptions)
    "Return a padded version of the list of string lists DESCRIPTIONS. The
strings are padded to the length of the longer string in a same column, as
determined by MAX-LENGTH-COLUMN procedure."
    (let* ((description-length (length (car descriptions)))
           (paddings (map (lambda (index)
                            (max-length-column descriptions index))
                          (iota description-length))))
      (map (lambda (description)
             (map string-pad-right description paddings))
           descriptions)))

  (let* ((descriptions
          (map
           (lambda (partition)
             (let ((user-partition
                    (find-user-partition-by-parted-object user-partitions
                                                          partition)))
               (partition-description partition user-partition)))
           partitions))
         (padded-descriptions (if (null? partitions)
                                  '()
                                  (pad-descriptions descriptions))))
    (map (cut string-join <> " ") padded-descriptions)))

(define (user-partition-description user-partition)
  "Return a string describing the given USER-PARTITION record."
  (let* ((partition (user-partition-parted-object user-partition))
         (disk (partition-disk partition))
         (disk-type (disk-disk-type disk))
         (device (disk-device disk))
         (has-name? (disk-type-check-feature
                     disk-type
                     DISK-TYPE-FEATURE-PARTITION-NAME))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED))
         (name (user-partition-name user-partition))
         (type (user-partition-type user-partition))
         (type-name (symbol->string type))
         (fs-type (user-partition-fs-type user-partition))
         (fs-type-name (user-fs-type-name fs-type))
         (bootable? (user-partition-bootable? user-partition))
         (esp? (user-partition-esp? user-partition))
         (need-formatting? (user-partition-need-formatting? user-partition))
         (crypt-label (user-partition-crypt-label user-partition))
         (size (user-partition-size user-partition))
         (mount-point (user-partition-mount-point user-partition)))
    `(,@(if has-name?
            `((name . ,(string-append "Name: " (or name "None"))))
            '())
      ,@(if (and has-extended?
                 (freespace-partition? partition)
                 (not (eq? type 'logical)))
            `((type . ,(string-append "Type: " type-name)))
            '())
      ,@(if (eq? type 'extended)
            '()
            `((fs-type . ,(string-append "Filesystem type: " fs-type-name))))
      ,@(if (or (eq? type 'extended)
                (eq? fs-type 'swap)
                (not has-extended?))
            '()
            `((bootable . ,(string-append "Bootable flag: "
                                          (if bootable? "On" "Off")))))
      ,@(if (and (not has-extended?)
                 (not (eq? fs-type 'swap)))
            `((esp? . ,(string-append "ESP flag: "
                                      (if esp? "On" "Off"))))
            '())
      ,@(if (freespace-partition? partition)
            (let ((size-formatted
                   (or size (unit-format device
                                         (partition-length partition)))))
              `((size . ,(string-append "Size : " size-formatted))))
            '())
      ,@(if (or (eq? type 'extended)
                (eq? fs-type 'swap))
            '()
            `((crypt-label
               . ,(string-append
                   "Encryption: "
                   (if crypt-label
                       (format #f "Yes (label ~a)" crypt-label)
                       "No")))))
      ,@(if (or (freespace-partition? partition)
                (eq? fs-type 'swap))
            '()
            `((need-formatting?
               . ,(string-append "Format the partition? : "
                                 (if need-formatting? "Yes" "No")))))
      ,@(if (or (eq? type 'extended)
                (eq? fs-type 'swap))
            '()
            `((mount-point
               . ,(string-append "Mount point : "
                                 (or mount-point
                                     (and esp? (default-esp-mount-point))
                                     "None"))))))))

;;
;; Partition table creation.
;;

(define (mklabel device type-name)
  "Create a partition table on DEVICE. TYPE-NAME is the type of the partition
table, \"msdos\" or \"gpt\"."
  (let ((type (disk-type-get type-name)))
    (disk-new-fresh device type)))

;;
;; Partition creation.
;;

;; The maximum count of primary partitions is exceeded.
(define-condition-type &max-primary-exceeded &condition
  max-primary-exceeded?)

;; It is not possible to create an extended partition.
(define-condition-type &extended-creation-error &condition
  extended-creation-error?)

;; It is not possible to create a logical partition.
(define-condition-type &logical-creation-error &condition
  logical-creation-error?)

(define (can-create-primary? disk)
  "Return #t if it is possible to create a primary partition on DISK, return
#f otherwise."
  (let ((max-primary (disk-get-max-primary-partition-count disk)))
    (find (lambda (number)
            (not (disk-get-partition disk number)))
          (iota max-primary 1))))

(define (can-create-extended? disk)
  "Return #t if it is possible to create an extended partition on DISK, return
#f otherwise."
  (let* ((disk-type (disk-disk-type disk))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED)))
    (and (can-create-primary? disk)
         has-extended?
         (not (disk-extended-partition disk)))))

(define (can-create-logical? disk)
  "Return #t is it is possible to create a logical partition on DISK, return
#f otherwise."
  (let* ((disk-type (disk-disk-type disk))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED)))
    (and has-extended?
         (disk-extended-partition disk))))

(define (can-create-partition? user-part)
  "Return #t if it is possible to create the given USER-PART record, return #f
otherwise."
  (let* ((type (user-partition-type user-part))
         (partition (user-partition-parted-object user-part))
         (disk (partition-disk partition)))
    (case type
      ((normal)
       (or (can-create-primary? disk)
           (raise
            (condition (&max-primary-exceeded)))))
      ((extended)
       (or (can-create-extended? disk)
           (raise
            (condition (&extended-creation-error)))))
      ((logical)
       (or (can-create-logical? disk)
           (raise
            (condition (&logical-creation-error))))))))

(define* (mkpart disk user-partition
                 #:key (previous-partition #f))
  "Create the given USER-PARTITION on DISK. The PREVIOUS-PARTITION argument as
to be set to the partition preceding USER-PARTITION if any."

  (define (parse-start-end start end)
    "Parse start and end strings as positions on DEVICE expressed with a unit,
like '100GB' or '12.2KiB'. Return a list of 4 elements, the start sector, its
range (1 unit large area centered on start sector), the end sector and its
range."
    (let ((device (disk-device disk)))
      (call-with-values
          (lambda ()
            (unit-parse start device))
        (lambda (start-sector start-range)
          (call-with-values
              (lambda ()
                (unit-parse end device))
            (lambda (end-sector end-range)
              (list start-sector start-range
                    end-sector end-range)))))))

  (define* (extend-ranges! start-range end-range
                           #:key (offset 0))
    "Try to extend START-RANGE by 1 MEBIBYTE to the right and END-RANGE by 1
MEBIBYTE to the left. This way, if the disk is aligned on 2048 sectors of
512KB (like frequently), we will have a chance for the
'optimal-align-constraint' to succeed. Do not extend ranges if that would
cause them to cross."
    (let* ((device (disk-device disk))
           (start-range-end (geometry-end start-range))
           (end-range-start (geometry-start end-range))
           (mebibyte-sector-size (/ MEBIBYTE-SIZE
                                    (device-sector-size device)))
           (new-start-range-end
            (+ start-range-end mebibyte-sector-size offset))
           (new-end-range-start
            (- end-range-start mebibyte-sector-size offset)))
      (when (< new-start-range-end new-end-range-start)
        (geometry-set-end start-range new-start-range-end)
        (geometry-set-start end-range new-end-range-start))))

  (match (parse-start-end (user-partition-start user-partition)
                          (user-partition-end user-partition))
    ((start-sector start-range end-sector end-range)
     (let* ((prev-end (if previous-partition
                          (partition-end previous-partition)
                          0))
            (start-distance (- start-sector prev-end))
            (type (user-partition-type user-partition))
            ;; There should be at least 2 unallocated sectors in front of each
            ;; logical partition, otherwise parted will fail badly:
            ;; https://gparted.org/h2-fix-msdos-pt.php#apply-action-fail.
            (start-offset (if previous-partition
                              (- 3 start-distance)
                              0))
            (start-sector* (if (and (eq? type 'logical)
                                    (< start-distance 3))
                               (+ start-sector start-offset)
                               start-sector)))
       ;; This is a hack.  Parted almost always fails to create optimally
       ;; aligned partitions (unless specifying percentages) because the
       ;; default range of 1MB centered on the start sector is not enough when
       ;; the optimal alignment is 2048 sectors of 512KB.
       (extend-ranges! start-range end-range #:offset start-offset)

       (let* ((device (disk-device disk))
              (disk-type (disk-disk-type disk))
              (length (device-length device))
              (name (user-partition-name user-partition))
              (filesystem-type
               (filesystem-type-get
                (user-fs-type-name
                 (user-partition-fs-type user-partition))))
              (flags `(,@(if (user-partition-bootable? user-partition)
                             `(,PARTITION-FLAG-BOOT)
                             '())
                       ,@(if (user-partition-esp? user-partition)
                             `(,PARTITION-FLAG-ESP)
                             '())
                       ,@(if (user-partition-bios-grub? user-partition)
                             `(,PARTITION-FLAG-BIOS-GRUB)
                             '())))
              (has-name? (disk-type-check-feature
                          disk-type
                          DISK-TYPE-FEATURE-PARTITION-NAME))
              (partition-type (partition-type->int type))
              (partition (partition-new disk
                                        #:type partition-type
                                        #:filesystem-type filesystem-type
                                        #:start start-sector*
                                        #:end end-sector))
              (user-constraint (constraint-new
                                #:start-align 'any
                                #:end-align 'any
                                #:start-range start-range
                                #:end-range end-range
                                #:min-size 1
                                #:max-size length))
              (dev-constraint
               (device-get-optimal-aligned-constraint device))
              (final-constraint (constraint-intersect user-constraint
                                                      dev-constraint))
              (no-constraint (constraint-any device))
              ;; Try to create a partition with an optimal alignment
              ;; constraint. If it fails, fallback to creating a partition with
              ;; no specific constraint.
              (partition-ok?
               (or (disk-add-partition disk partition final-constraint)
                   (disk-add-partition disk partition no-constraint))))
         ;; Set the partition name if supported.
         (when (and partition-ok? has-name? name)
           (partition-set-name partition name))

         ;; Set flags is required.
         (for-each (lambda (flag)
                     (and (partition-is-flag-available? partition flag)
                          (partition-set-flag partition flag 1)))
                   flags)

         (and partition-ok?
              (partition-set-system partition filesystem-type)
              partition))))))

;;
;; Partition destruction.
;;

(define (rmpart disk number)
  "Remove the partition with the given NUMBER on DISK."
  (let ((partition (disk-get-partition disk number)))
    (disk-remove-partition* disk partition)))

;;
;; Auto partitionning.
;;

(define* (create-adjacent-partitions! disk partitions
                                      #:key (last-partition-end 0))
  "Create the given PARTITIONS on DISK. LAST-PARTITION-END is the sector from
which we want to start creating partitions. The START and END of each created
partition are computed from its SIZE value and the position of the last
partition."
  (let ((device (disk-device disk)))
    (let loop ((partitions partitions)
               (remaining-space (- (device-length device)
                                   last-partition-end))
               (start last-partition-end))
      (match partitions
        (() '())
        ((partition . rest)
         (let* ((size (user-partition-size partition))
                (percentage-size (and (string? size)
                                      (read-percentage size)))
                (sector-size (device-sector-size device))
                (partition-size (if percentage-size
                                    (exact->inexact
                                     (* (/ percentage-size 100)
                                        remaining-space))
                                    size))
                (end-partition (min (- (device-length device) 1)
                                    (nearest-exact-integer
                                     (+ start partition-size 1))))
                (name (user-partition-name partition))
                (type (user-partition-type partition))
                (fs-type (user-partition-fs-type partition))
                (start-formatted (unit-format-custom device
                                                     start
                                                     UNIT-SECTOR))
                (end-formatted (unit-format-custom device
                                                   end-partition
                                                   UNIT-SECTOR))
                (new-user-partition (user-partition
                                     (inherit partition)
                                     (start start-formatted)
                                     (end end-formatted)))
                (new-partition
                 (mkpart disk new-user-partition)))
           (if new-partition
               (cons (user-partition
                      (inherit new-user-partition)
                      (file-name (partition-get-path new-partition))
                      (disk-file-name (device-path device))
                      (parted-object new-partition))
                     (loop rest
                           (if (eq? type 'extended)
                               remaining-space
                               (- remaining-space
                                  (partition-length new-partition)))
                           (if (eq? type 'extended)
                               (+ start 1)
                               (+ (partition-end new-partition) 1))))
               (error
                (format #f "Unable to create partition ~a~%" name)))))))))

(define (force-user-partitions-formatting user-partitions)
  "Set the NEED-FORMATING? fields to #t on all <user-partition> records of
USER-PARTITIONS list and return the updated list."
  (map (lambda (p)
         (user-partition
          (inherit p)
          (need-formatting? #t)))
       user-partitions))

(define* (auto-partition! disk
                          #:key
                          (scheme 'entire-root))
  "Automatically create partitions on DISK. All the previous
partitions (except the ESP on a GPT disk, if present) are wiped. SCHEME is the
desired partitioning scheme. It can be 'entire-root or
'entire-root-home. 'entire-root will create a swap partition and a root
partition occupying all the remaining space. 'entire-root-home will create a
swap partition, a root partition and a home partition.

Return the complete list of partitions on DISK, including the ESP when it
exists."
  (let* ((device (disk-device disk))
         (disk-type (disk-disk-type disk))
         (has-extended? (disk-type-check-feature
                         disk-type
                         DISK-TYPE-FEATURE-EXTENDED))
         (partitions (filter data-partition? (disk-partitions disk)))
         (esp-partition (find-esp-partition partitions))
         ;; According to
         ;; https://wiki.archlinux.org/index.php/EFI_system_partition, the ESP
         ;; size should be at least 550MiB.
         (new-esp-size (nearest-exact-integer
                        (/ (* 550 MEBIBYTE-SIZE)
                           (device-sector-size device))))
         (end-esp-partition (and esp-partition
                                 (partition-end esp-partition)))
         (non-boot-partitions (remove esp-partition? partitions))
         (bios-grub-size (/ (* 3 MEBIBYTE-SIZE)
                            (device-sector-size device)))
         (five-percent-disk (nearest-exact-integer
                             (* 0.05 (device-length device))))
         (default-swap-size (nearest-exact-integer
                             (/ (* 4 GIGABYTE-SIZE)
                                (device-sector-size device))))
         ;; Use a 4GB size for the swap if it represents less than 5% of the
         ;; disk space. Otherwise, set the swap size to 5% of the disk space.
         (swap-size (min default-swap-size five-percent-disk)))

    (if has-extended?
        ;; msdos - remove everything.
        (disk-remove-all-partitions disk)
        ;; gpt - remove everything but esp if it exists.
        (for-each
         (lambda (partition)
           (and (data-partition? partition)
                (disk-remove-partition* disk partition)))
         non-boot-partitions))

    (let* ((start-partition
            (and (not has-extended?)
                 (not esp-partition)
                 (if (efi-installation?)
                     (user-partition
                      (fs-type 'fat32)
                      (esp? #t)
                      (size new-esp-size)
                      (mount-point (default-esp-mount-point)))
                     (user-partition
                      (fs-type 'ext4)
                      (bootable? #t)
                      (bios-grub? #t)
                      (size bios-grub-size)))))
           (new-partitions
            (cond
             ((or (eq? scheme 'entire-root)
                  (eq? scheme 'entire-encrypted-root))
              (let ((encrypted? (eq? scheme 'entire-encrypted-root)))
                `(,@(if start-partition
                        `(,start-partition)
                        '())
                  ,@(if encrypted?
                        '()
                        `(,(user-partition
                            (fs-type 'swap)
                            (size swap-size))))
                  ,(user-partition
                    (fs-type 'ext4)
                    (bootable? has-extended?)
                    (crypt-label (and encrypted? "cryptroot"))
                    (size "100%")
                    (mount-point "/")))))
             ((or (eq? scheme 'entire-root-home)
                  (eq? scheme 'entire-encrypted-root-home))
              (let ((encrypted? (eq? scheme 'entire-encrypted-root-home)))
                `(,@(if start-partition
                        `(,start-partition)
                        '())
                  ,(user-partition
                    (fs-type 'ext4)
                    (bootable? has-extended?)
                    (crypt-label (and encrypted? "cryptroot"))
                    (size "33%")
                    (mount-point "/"))
                  ,@(if has-extended?
                        `(,(user-partition
                            (type 'extended)
                            (size "100%")))
                        '())
                  ,@(if encrypted?
                        '()
                        `(,(user-partition
                            (type (if has-extended?
                                      'logical
                                      'normal))
                            (fs-type 'swap)
                            (size swap-size))))
                  ,(user-partition
                    (type (if has-extended?
                              'logical
                              'normal))
                    (fs-type 'ext4)
                    (crypt-label (and encrypted? "crypthome"))
                    (size "100%")
                    (mount-point "/home")))))))
           (new-partitions* (force-user-partitions-formatting
                             new-partitions)))
      (append (if esp-partition
                  (list (partition->user-partition esp-partition))
                  '())
              (create-adjacent-partitions! disk
                                           new-partitions*
                                           #:last-partition-end
                                           (or end-esp-partition 0))))))

;;
;; Convert user-partitions.
;;

;; No root mount point found.
(define-condition-type &no-root-mount-point &condition
  no-root-mount-point?)

(define (check-user-partitions user-partitions)
  "Return #t if the USER-PARTITIONS lists contains one <user-partition> record
with a mount-point set to '/', raise &no-root-mount-point condition
otherwise."
  (let ((mount-points
         (map user-partition-mount-point user-partitions)))
    (or (member "/" mount-points)
        (raise
         (condition (&no-root-mount-point))))))

(define (set-user-partitions-file-name user-partitions)
  "Set the partition file-name of <user-partition> records in USER-PARTITIONS
list and return the updated list."
  (map (lambda (p)
         (let* ((partition (user-partition-parted-object p))
                (file-name (partition-get-path partition)))
           (user-partition
            (inherit p)
            (file-name file-name))))
       user-partitions))

(define-syntax-rule (with-null-output-ports exp ...)
  "Evaluate EXP with both the output port and the error port pointing to the
bit bucket."
  (with-output-to-port (%make-void-port "w")
    (lambda ()
      (with-error-to-port (%make-void-port "w")
        (lambda () exp ...)))))

(define (create-btrfs-file-system partition)
  "Create a btrfs file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.btrfs" "-f" partition)))

(define (create-ext4-file-system partition)
  "Create an ext4 file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.ext4" "-F" partition)))

(define (create-fat16-file-system partition)
  "Create a fat16 file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.fat" "-F16" partition)))

(define (create-fat32-file-system partition)
  "Create a fat32 file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.fat" "-F32" partition)))

(define (create-jfs-file-system partition)
  "Create a JFS file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "jfs_mkfs" "-f" partition)))

(define (create-ntfs-file-system partition)
  "Create a JFS file-system for PARTITION file-name."
  (with-null-output-ports
   (invoke "mkfs.ntfs" "-F" "-f" partition)))

(define (create-swap-partition partition)
  "Set up swap area on PARTITION file-name."
  (with-null-output-ports
   (invoke "mkswap" "-f" partition)))

(define (call-with-luks-key-file password proc)
  "Write PASSWORD in a temporary file and pass it to PROC as argument."
  (call-with-temporary-output-file
   (lambda (file port)
     (put-string port password)
     (close port)
     (proc file))))

(define (user-partition-upper-file-name user-partition)
  "Return the file-name of the virtual block device corresponding to
USER-PARTITION if it is encrypted, or the plain file-name otherwise."
  (let ((crypt-label (user-partition-crypt-label user-partition))
        (file-name (user-partition-file-name user-partition)))
    (if crypt-label
        (string-append "/dev/mapper/" crypt-label)
        file-name)))

(define (luks-format-and-open user-partition)
  "Format and open the encrypted partition pointed by USER-PARTITION."
  (let* ((file-name (user-partition-file-name user-partition))
         (label (user-partition-crypt-label user-partition))
         (password (user-partition-crypt-password user-partition)))
    (call-with-luks-key-file
     password
     (lambda (key-file)
       (syslog "formatting and opening LUKS entry ~s at ~s~%"
               label file-name)
       (system* "cryptsetup" "-q" "luksFormat" file-name key-file)
       (system* "cryptsetup" "open" "--type" "luks"
                "--key-file" key-file file-name label)))))

(define (luks-close user-partition)
  "Close the encrypted partition pointed by USER-PARTITION."
  (let ((label (user-partition-crypt-label user-partition)))
    (syslog "closing LUKS entry ~s~%" label)
    (system* "cryptsetup" "close" label)))

(define (format-user-partitions user-partitions)
  "Format the <user-partition> records in USER-PARTITIONS list with
NEED-FORMATING? field set to #t."
  (for-each
   (lambda (user-partition)
     (let* ((need-formatting?
             (user-partition-need-formatting? user-partition))
            (type (user-partition-type user-partition))
            (crypt-label (user-partition-crypt-label user-partition))
            (file-name (user-partition-upper-file-name user-partition))
            (fs-type (user-partition-fs-type user-partition)))
       (when crypt-label
         (luks-format-and-open user-partition))

       (case fs-type
         ((btrfs)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-btrfs-file-system file-name)))
         ((ext4)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-ext4-file-system file-name)))
         ((fat16)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-fat16-file-system file-name)))
         ((fat32)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-fat32-file-system file-name)))
         ((jfs)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-jfs-file-system file-name)))
         ((ntfs)
          (and need-formatting?
               (not (eq? type 'extended))
               (create-ntfs-file-system file-name)))
         ((swap)
          (create-swap-partition file-name))
         (else
          ;; TODO: Add support for other file-system types.
          #t))))
   user-partitions))

(define (sort-partitions user-partitions)
  "Sort USER-PARTITIONS by mount-points, so that the more nested mount-point
comes last. This is useful to mount/umount partitions in a coherent order."
  (sort user-partitions
        (lambda (a b)
          (let ((mount-point-a (user-partition-mount-point a))
                (mount-point-b (user-partition-mount-point b)))
            (string-prefix? mount-point-a mount-point-b)))))

(define (mount-user-partitions user-partitions)
  "Mount the <user-partition> records in USER-PARTITIONS list on their
respective mount-points."
  (let* ((mount-partitions (filter user-partition-mount-point user-partitions))
         (sorted-partitions (sort-partitions mount-partitions)))
    (for-each (lambda (user-partition)
                (let* ((mount-point
                        (user-partition-mount-point user-partition))
                       (target
                        (string-append (%installer-target-dir)
                                       mount-point))
                       (fs-type
                        (user-partition-fs-type user-partition))
                       (crypt-label
                        (user-partition-crypt-label user-partition))
                       (mount-type
                        (user-fs-type->mount-type fs-type))
                       (file-name
                        (user-partition-upper-file-name user-partition)))
                  (mkdir-p target)
                  (syslog "mounting ~s on ~s~%" file-name target)
                  (mount file-name target mount-type)))
              sorted-partitions)))

(define (umount-user-partitions user-partitions)
  "Unmount all the <user-partition> records in USER-PARTITIONS list."
  (let* ((mount-partitions (filter user-partition-mount-point user-partitions))
         (sorted-partitions (sort-partitions mount-partitions)))
    (for-each (lambda (user-partition)
                (let* ((mount-point
                        (user-partition-mount-point user-partition))
                       (crypt-label
                        (user-partition-crypt-label user-partition))
                       (target
                        (string-append (%installer-target-dir)
                                       mount-point)))
                  (syslog "unmounting ~s~%" target)
                  (umount target)
                  (when crypt-label
                    (luks-close user-partition))))
              (reverse sorted-partitions))))

(define (find-swap-user-partitions user-partitions)
  "Return the subset of <user-partition> records in USER-PARTITIONS list with
the FS-TYPE field set to 'swap, return the empty list if none found."
  (filter (lambda (user-partition)
            (let ((fs-type (user-partition-fs-type user-partition)))
              (eq? fs-type 'swap)))
          user-partitions))

(define (start-swapping user-partitions)
  "Start swaping on <user-partition> records with FS-TYPE equal to 'swap."
  (let* ((swap-user-partitions (find-swap-user-partitions user-partitions))
         (swap-devices (map user-partition-file-name swap-user-partitions)))
    (for-each swapon swap-devices)))

(define (stop-swapping user-partitions)
  "Stop swaping on <user-partition> records with FS-TYPE equal to 'swap."
  (let* ((swap-user-partitions (find-swap-user-partitions user-partitions))
         (swap-devices (map user-partition-file-name swap-user-partitions)))
    (for-each swapoff swap-devices)))

(define-syntax-rule (with-mounted-partitions user-partitions exp ...)
  "Mount USER-PARTITIONS and start swapping within the dynamic extent of EXP."
  (dynamic-wind
    (lambda ()
      (mount-user-partitions user-partitions)
      (start-swapping user-partitions))
    (lambda ()
      exp ...)
    (lambda ()
      (umount-user-partitions user-partitions)
      (stop-swapping user-partitions)
      #f)))

(define (user-partition->file-system user-partition)
  "Convert the given USER-PARTITION record in a FILE-SYSTEM record from
(gnu system file-systems) module and return it."
  (let* ((mount-point (user-partition-mount-point user-partition))
         (fs-type (user-partition-fs-type user-partition))
         (crypt-label (user-partition-crypt-label user-partition))
         (mount-type (user-fs-type->mount-type fs-type))
         (file-name (user-partition-file-name user-partition))
         (upper-file-name (user-partition-upper-file-name user-partition))
         ;; Only compute uuid if partition is not encrypted.
         (uuid (or crypt-label
                   (uuid->string (read-partition-uuid file-name) fs-type))))
    `(file-system
       (mount-point ,mount-point)
       (device ,@(if crypt-label
                     `(,upper-file-name)
                     `((uuid ,uuid (quote ,fs-type)))))
       (type ,mount-type)
       ,@(if crypt-label
             '((dependencies mapped-devices))
             '()))))

(define (user-partitions->file-systems user-partitions)
  "Convert the given USER-PARTITIONS list of <user-partition> records into a
list of <file-system> records."
  (filter-map
   (lambda (user-partition)
     (let ((mount-point
            (user-partition-mount-point user-partition)))
       (and mount-point
            (user-partition->file-system user-partition))))
   user-partitions))

(define (user-partition->mapped-device user-partition)
  "Convert the given USER-PARTITION record into a MAPPED-DEVICE record
from (gnu system mapped-devices) and return it."
  (let ((label (user-partition-crypt-label user-partition))
        (file-name (user-partition-file-name user-partition)))
    `(mapped-device
      (source (uuid ,(uuid->string
                      (read-luks-partition-uuid file-name)
                      'luks)))
      (target ,label)
      (type luks-device-mapping))))

(define (root-user-partition? partition)
  "Return true if PARTITION is the root partition."
  (let ((mount-point (user-partition-mount-point partition)))
    (and mount-point
         (string=? mount-point "/"))))

(define (bootloader-configuration user-partitions)
  "Return the bootloader configuration field for USER-PARTITIONS."
  (let* ((root-partition (find root-user-partition?
                               user-partitions))
         (root-partition-disk (user-partition-disk-file-name root-partition)))
    `((bootloader-configuration
       ,@(if (efi-installation?)
             `((bootloader grub-efi-bootloader)
               (target ,(default-esp-mount-point)))
             `((bootloader grub-bootloader)
               (target ,root-partition-disk)))

       ;; XXX: Assume we defined the 'keyboard-layout' field of
       ;; <operating-system> right above.
       (keyboard-layout keyboard-layout)))))

(define (user-partition-missing-modules user-partitions)
  "Return the list of kernel modules missing from the default set of kernel
modules to access USER-PARTITIONS."
  (let ((devices (filter user-partition-crypt-label user-partitions))
        (root    (find root-user-partition? user-partitions)))
    (delete-duplicates
     (append-map (lambda (device)
                   (catch 'system-error
                     (lambda ()
                       (missing-modules device %base-initrd-modules))
                     (const '())))
                 (delete-duplicates
                  (map user-partition-file-name
                       (cons root devices)))))))

(define (initrd-configuration user-partitions)
  "Return an 'initrd-modules' field with everything needed for
USER-PARTITIONS, or return nothing."
  (match (user-partition-missing-modules user-partitions)
    (()
     '())
    ((modules ...)
     `((initrd-modules (append ',modules
                               %base-initrd-modules))))))

(define (user-partitions->configuration user-partitions)
  "Return the configuration field for USER-PARTITIONS."
  (let* ((swap-user-partitions (find-swap-user-partitions user-partitions))
         (swap-devices (map user-partition-file-name swap-user-partitions))
         (encrypted-partitions
          (filter user-partition-crypt-label user-partitions)))
    `((bootloader ,@(bootloader-configuration user-partitions))
      ,@(initrd-configuration user-partitions)
      ,@(if (null? swap-devices)
            '()
            `((swap-devices (list ,@swap-devices))))
      ,@(if (null? encrypted-partitions)
            '()
            `((mapped-devices
               (list ,@(map user-partition->mapped-device
                            encrypted-partitions)))))
      (file-systems (cons*
                     ,@(user-partitions->file-systems user-partitions)
                     %base-file-systems)))))

;;
;; Initialization.
;;

(define (init-parted)
  "Initialize libparted support."
  (probe-all-devices!)
  ;; Remove all logical devices, otherwise "device-is-busy?" will report true
  ;; on all devices containaing active logical volumes.
  (remove-logical-devices)
  (exception-set-handler (lambda (exception)
                           EXCEPTION-OPTION-UNHANDLED)))

(define (free-parted devices)
  "Deallocate memory used for DEVICES in parted, force sync them and wait for
the devices not to be used before returning."
  ;; XXX: Formatting and further operations on disk partition table may fail
  ;; because the partition table changes are not synced, or because the device
  ;; is still in use, even if parted should have finished editing
  ;; partitions. This is not well understood, but syncing devices and waiting
  ;; them to stop returning EBUSY to BLKRRPART ioctl seems to be enough. The
  ;; same kind of issue is described here:
  ;; https://mail.gnome.org/archives/commits-list/2013-March/msg18423.html.
  (let ((device-file-names (map device-path devices)))
    (for-each force-device-sync devices)
    (for-each (lambda (file-name)
                (let ((in-use? (with-delay-device-in-use? file-name)))
                  (and in-use?
                       (error
                        (format #f (G_ "Device ~a is still in use.")
                                file-name)))))
              device-file-names)))


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer proxy)
  #:use-module (gnu services herd)
  #:export (set-http-proxy
            clear-http-proxy))

(define-syntax-rule (with-silent-shepherd exp ...)
  (parameterize ((shepherd-message-port
                  (%make-void-port "w")))
    exp ...))

(define (set-http-proxy proxy)
  (with-silent-shepherd
    (with-shepherd-action 'guix-daemon
        ('set-http-proxy proxy)
        result
      result)))

(define (clear-http-proxy)
  (with-silent-shepherd
    (with-shepherd-action 'guix-daemon
        ('set-http-proxy)
        result
      result)))

;; Local Variables:
;; eval: (put 'with-silent-shepherd 'scheme-indent-function 0)
;; End:

license: mit


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2020 Florian Pelz <pelzflorian@pelzflorian.de>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer record)
  #:use-module (guix records)
  #:use-module (srfi srfi-1)
  #:export (<installer>
            installer
            make-installer
            installer?
            installer-name
            installer-init
            installer-exit
            installer-exit-error
            installer-final-page
            installer-keymap-page
            installer-locale-page
            installer-menu-page
            installer-network-page
            installer-timezone-page
            installer-hostname-page
            installer-user-page
            installer-partition-page
            installer-services-page
            installer-welcome-page
            installer-parameters-menu
            installer-parameters-page))

;;;
;;; Installer record.
;;;

;; The <installer> record contains pages that will be run to prompt the user
;; for the system configuration. The goal of the installer is to produce a
;; complete <operating-system> record and install it.

(define-record-type* <installer>
  installer make-installer
  installer?
  ;; symbol
  (name installer-name)
  ;; procedure: void -> void
  (init installer-init)
  ;; procedure: void -> void
  (exit installer-exit)
  ;; procedure (key arguments) -> void
  (exit-error installer-exit-error)
  ;; procedure void -> void
  (final-page installer-final-page)
  ;; procedure (layouts context) -> (list layout variant options)
  (keymap-page installer-keymap-page)
  ;; procedure: (#:key supported-locales iso639-languages iso3166-territories)
  ;; -> glibc-locale
  (locale-page installer-locale-page)
  ;; procedure: (steps) -> step-id
  (menu-page installer-menu-page)
  ;; procedure void -> void
  (network-page installer-network-page)
  ;; procedure (zonetab) -> posix-timezone
  (timezone-page installer-timezone-page)
  ;; procedure void -> void
  (hostname-page installer-hostname-page)
  ;; procedure void -> void
  (user-page installer-user-page)
  ;; procedure void -> void
  (partition-page installer-partition-page)
  ;; procedure void -> void
  (services-page installer-services-page)
  ;; procedure (logo) -> void
  (welcome-page installer-welcome-page)
  ;; procedure (menu-proc) -> void
  (parameters-menu installer-parameters-menu)
  ;; procedure (keyboard-layout-selection) -> void
  (parameters-page installer-parameters-page))


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer services)
  #:use-module (guix records)
  #:use-module (srfi srfi-1)
  #:export (system-service?
            system-service-name
            system-service-type
            system-service-recommended?
            system-service-snippet
            system-service-packages

            desktop-system-service?
            networking-system-service?

            %system-services
            system-services->configuration))

(define-record-type* <system-service>
  system-service make-system-service
  system-service?
  (name            system-service-name)           ;string
  (type            system-service-type)           ;'desktop | 'networking
  (recommended?    system-service-recommended?    ;Boolean
                   (default #f))
  (snippet         system-service-snippet         ;list of sexps
                   (default '()))
  (packages        system-service-packages        ;list of sexps
                   (default '())))

;; This is the list of desktop environments supported as services.
(define %system-services
  (let-syntax ((desktop-environment (syntax-rules ()
                                      ((_ fields ...)
                                       (system-service
                                        (type 'desktop)
                                        fields ...))))
               (G_ (syntax-rules ()               ;for xgettext
                     ((_ str) str))))
    (list
     (desktop-environment
      (name "GNOME")
      (snippet '((service gnome-desktop-service-type))))
     (desktop-environment
      (name "Xfce")
      (snippet '((service xfce-desktop-service-type))))
     (desktop-environment
      (name "MATE")
      (snippet '((service mate-desktop-service-type))))
     (desktop-environment
      (name "Enlightenment")
      (snippet '((service enlightenment-desktop-service-type))))
     (desktop-environment
      (name "Openbox")
      (packages '((specification->package "openbox"))))
     (desktop-environment
      (name "awesome")
      (packages '((specification->package "awesome"))))
     (desktop-environment
      (name "i3")
      (packages (map (lambda (package)
                       `(specification->package ,package))
                     '("i3-wm" "i3status" "dmenu" "st"))))
     (desktop-environment
      (name "ratpoison")
      (packages '((specification->package "ratpoison")
                  (specification->package "xterm"))))

     ;; Networking.
     (system-service
      (name (G_ "OpenSSH secure shell daemon (sshd)"))
      (type 'networking)
      (snippet '((service openssh-service-type))))
     (system-service
      (name (G_ "Tor anonymous network router"))
      (type 'networking)
      (snippet '((service tor-service-type))))
     (system-service
      (name (G_ "Mozilla NSS certificates, for HTTPS access"))
      (type 'networking)
      (packages '((specification->package "nss-certs")))
      (recommended? #t))

     ;; Network connectivity management.
     (system-service
      (name (G_ "NetworkManager network connection manager"))
      (type 'network-management)
      (snippet '((service network-manager-service-type)
                 (service wpa-supplicant-service-type))))
     (system-service
      (name (G_ "Connman network connection manager"))
      (type 'network-management)
      (snippet '((service connman-service-type)
                 (service wpa-supplicant-service-type))))
     (system-service
      (name (G_ "DHCP client (dynamic IP address assignment)"))
      (type 'network-management)
      (snippet '((service dhcp-client-service-type)))))))

(define (desktop-system-service? service)
  "Return true if SERVICE is a desktop environment service."
  (eq? 'desktop (system-service-type service)))

(define (networking-system-service? service)
  "Return true if SERVICE is a desktop environment service."
  (eq? 'networking (system-service-type service)))

(define (system-services->configuration services)
  "Return the configuration field for SERVICES."
  (let* ((snippets (append-map system-service-snippet services))
         (packages (append-map system-service-packages services))
         (desktop? (find desktop-system-service? services))
         (base     (if desktop?
                       '%desktop-services
                       '%base-services)))
    (if (null? snippets)
        `(,@(if (null? packages)
                '()
                `((packages (append (list ,@packages)
                                    %base-packages))))
          (services ,base))
        `(,@(if (null? packages)
                '()
                `((packages (append (list ,@packages)
                                    %base-packages))))
          (services (append (list ,@snippets

                                  ,@(if desktop?
                                        ;; XXX: Assume 'keyboard-layout' is in
                                        ;; scope.
                                        '((set-xorg-configuration
                                           (xorg-configuration
                                            (keyboard-layout keyboard-layout))))
                                        '()))
                           ,base))))))


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018, 2019 Mathieu Othacehe <m.othacehe@gmail.com>
;;; Copyright © 2020 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer steps)
  #:use-module (guix records)
  #:use-module (guix build utils)
  #:use-module (gnu installer utils)
  #:use-module (ice-9 match)
  #:use-module (ice-9 pretty-print)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:use-module (rnrs io ports)
  #:export (&installer-step-abort
            installer-step-abort?

            &installer-step-break
            installer-step-break?

            <installer-step>
            installer-step
            make-installer-step
            installer-step?
            installer-step-id
            installer-step-description
            installer-step-compute
            installer-step-configuration-formatter

            run-installer-steps
            find-step-by-id
            result->step-ids
            result-step
            result-step-done?

            %installer-configuration-file
            %installer-target-dir
            %configuration-file-width
            format-configuration
            configuration->file))

;; This condition may be raised to abort the current step.
(define-condition-type &installer-step-abort &condition
  installer-step-abort?)

;; This condition may be raised to break out from the steps execution.
(define-condition-type &installer-step-break &condition
  installer-step-break?)

;; An installer-step record is basically an id associated to a compute
;; procedure. The COMPUTE procedure takes exactly one argument, an association
;; list containing the results of previously executed installer-steps (see
;; RUN-INSTALLER-STEPS description). The value returned by the COMPUTE
;; procedure will be stored in the results list passed to the next
;; installer-step and so on.
(define-record-type* <installer-step>
  installer-step make-installer-step
  installer-step?
  (id                         installer-step-id) ;symbol
  (description                installer-step-description ;string
                              (default #f)

                              ;; Make it thunked so that 'G_' is called at the
                              ;; right time, as opposed to being called once
                              ;; when the installer starts.
                              (thunked))
  (compute                    installer-step-compute) ;procedure
  (configuration-formatter    installer-step-configuration-formatter ;procedure
                              (default #f)))

(define* (run-installer-steps #:key
                              steps
                              (rewind-strategy 'previous)
                              (menu-proc (const #f)))
  "Run the COMPUTE procedure of all <installer-step> records in STEPS
sequencially. If the &installer-step-abort condition is raised, fallback to a
previous install-step, accordingly to the specified REWIND-STRATEGY.

REWIND-STRATEGY possible values are 'previous, 'menu and 'start.  If 'previous
is selected, the execution will resume at the previous installer-step. If
'menu is selected, the MENU-PROC procedure will be called. Its return value
has to be an installer-step ID to jump to. The ID has to be the one of a
previously executed step. It is impossible to jump forward. Finally if 'start
is selected, the execution will resume at the first installer-step.

The result of every COMPUTE procedures is stored in an association list, under
the form:

		'((STEP-ID . COMPUTE-RESULT) ...)

where STEP-ID is the ID field of the installer-step and COMPUTE-RESULT the
result of the associated COMPUTE procedure. This result association list is
passed as argument of every COMPUTE procedure. It is finally returned when the
computation is over.

If the &installer-step-break condition is raised, stop the computation and
return the accumalated result so far."
  (define (pop-result list)
    (cdr list))

  (define (first-step? steps step)
    (match steps
      ((first-step . rest-steps)
       (equal? first-step step))))

  (define* (skip-to-step step result
                         #:key todo-steps done-steps)
    (match todo-steps
      ((todo . rest-todo)
       (let ((found? (eq? (installer-step-id todo)
                          (installer-step-id step))))
         (cond
          (found?
           (run result
                #:todo-steps todo-steps
                #:done-steps done-steps))
          ((and (not found?)
                (null? done-steps))
           (error (format #f "Step ~a not found" (installer-step-id step))))
          (else
           (match done-steps
             ((prev-done ... last-done)
              (skip-to-step step (pop-result result)
                            #:todo-steps (cons last-done todo-steps)
                            #:done-steps prev-done)))))))))

  (define* (run result #:key todo-steps done-steps)
    (match todo-steps
      (() (reverse result))
      ((step . rest-steps)
       (guard (c ((installer-step-abort? c)
                  (case rewind-strategy
                    ((previous)
                     (match done-steps
                       (()
                        ;; We cannot go previous the first step. So re-raise
                        ;; the exception. It might be useful in the case of
                        ;; nested run-installer-steps. Abort to 'raise-above
                        ;; prompt to prevent the condition from being catched
                        ;; by one of the previously installed guard.
                        (abort-to-prompt 'raise-above c))
                       ((prev-done ... last-done)
                        (run (pop-result result)
                             #:todo-steps (cons last-done todo-steps)
                             #:done-steps prev-done))))
                    ((menu)
                     (let ((goto-step (menu-proc
                                       (append done-steps (list step)))))
                       (if (eq? goto-step step)
                           (run result
                                #:todo-steps todo-steps
                                #:done-steps done-steps)
                           (skip-to-step goto-step result
                                         #:todo-steps todo-steps
                                         #:done-steps done-steps))))
                    ((start)
                     (if (null? done-steps)
                         ;; Same as above, it makes no sense to jump to start
                         ;; when we are at the first installer-step. Abort to
                         ;; 'raise-above prompt to re-raise the condition.
                         (abort-to-prompt 'raise-above c)
                         (run '()
                              #:todo-steps steps
                              #:done-steps '())))))
                 ((installer-step-break? c)
                  (reverse result)))
         (syslog "running step '~a'~%" (installer-step-id step))
         (let* ((id (installer-step-id step))
                (compute (installer-step-compute step))
                (res (compute result done-steps)))
           (run (alist-cons id res result)
                #:todo-steps rest-steps
                #:done-steps (append done-steps (list step))))))))

  ;; Ignore SIGPIPE so that we don't die if a client closes the connection
  ;; prematurely.
  (sigaction SIGPIPE SIG_IGN)

  (with-server-socket
    (call-with-prompt 'raise-above
      (lambda ()
        (run '()
             #:todo-steps steps
             #:done-steps '()))
      (lambda (k condition)
        (raise condition)))))

(define (find-step-by-id steps id)
  "Find and return the step in STEPS whose id is equal to ID."
  (find (lambda (step)
          (eq? (installer-step-id step) id))
        steps))

(define (result-step results step-id)
  "Return the result of the installer-step specified by STEP-ID in
RESULTS."
  (assoc-ref results step-id))

(define (result-step-done? results step-id)
  "Return #t if the installer-step specified by STEP-ID has a COMPUTE value
stored in RESULTS. Return #f otherwise."
  (and (assoc step-id results) #t))

(define %installer-configuration-file (make-parameter "/mnt/etc/config.scm"))
(define %installer-target-dir (make-parameter "/mnt"))
(define %configuration-file-width (make-parameter 79))

(define (format-configuration steps results)
  "Return the list resulting from the application of the procedure defined in
CONFIGURATION-FORMATTER field of <installer-step> on the associated result
found in RESULTS."
  (let ((configuration
         (append-map
          (lambda (step)
            (let* ((step-id (installer-step-id step))
                   (conf-formatter
                    (installer-step-configuration-formatter step))
                   (result-step (result-step results step-id)))
              (if (and result-step conf-formatter)
                  (conf-formatter result-step)
                  '())))
          steps))
        (modules '((use-modules (gnu))
                   (use-service-modules desktop networking ssh xorg))))
    `(,@modules
      ()
      (operating-system ,@configuration))))

(define* (configuration->file configuration
                              #:key (filename (%installer-configuration-file)))
  "Write the given CONFIGURATION to FILENAME."
  (mkdir-p (dirname filename))
  (call-with-output-file filename
    (lambda (port)
      (format port ";; This is an operating system configuration generated~%")
      (format port ";; by the graphical installer.~%")
      (newline port)
      (for-each (lambda (part)
                  (if (null? part)
                      (newline port)
                      (pretty-print part port)))
                configuration)
      (flush-output-port port))))

;;; Local Variables:
;;; eval: (put 'with-server-socket 'scheme-indent-function 0)
;;; End:


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2020 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer tests)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:use-module (ice-9 match)
  #:use-module (ice-9 regex)
  #:use-module (ice-9 pretty-print)
  #:export (&pattern-not-matched
            pattern-not-matched?

            %installer-socket-file
            open-installer-socket

            converse
            conversation-log-port

            choose-locale+keyboard
            enter-host-name+passwords
            choose-services
            choose-partitioning
            conclude-installation

            edit-configuration-file))

;;; Commentary:
;;;
;;; This module provides tools to test the guided "graphical" installer in a
;;; non-interactive fashion.  The core of it is 'converse': it allows you to
;;; state Expect-style dialogues, which happen over the Unix-domain socket the
;;; installer listens to.  Higher-level procedures such as
;;; 'choose-locale+keyboard' are provided to perform specific parts of the
;;; dialogue.
;;;
;;; Code:

(define %installer-socket-file
  ;; Socket the installer listens to.
  "/var/guix/installer-socket")

(define* (open-installer-socket #:optional (file %installer-socket-file))
  "Return a socket connected to the installer."
  (let ((sock (socket AF_UNIX SOCK_STREAM 0)))
    (connect sock AF_UNIX file)
    sock))

(define-condition-type &pattern-not-matched &error
  pattern-not-matched?
  (pattern pattern-not-matched-pattern)
  (sexp    pattern-not-matched-sexp))

(define (pattern-error pattern sexp)
  (raise (condition
          (&pattern-not-matched
           (pattern pattern) (sexp sexp)))))

(define conversation-log-port
  ;; Port where debugging info is logged
  (make-parameter (current-error-port)))

(define (converse-debug pattern)
  (format (conversation-log-port)
          "conversation expecting pattern ~s~%"
          pattern))

(define-syntax converse
  (lambda (s)
    "Convert over PORT: read sexps from there, match them against each
PATTERN, and send the corresponding REPLY.  Raise to '&pattern-not-matched'
when one of the PATTERNs is not matched."

    ;; XXX: Strings that appear in PATTERNs must be in the language the
    ;; installer is running in.  In the future, we should add support to allow
    ;; writing English strings in PATTERNs and have the pattern matcher
    ;; automatically translate them.

    ;; Here we emulate 'pmatch' syntax on top of 'match'.  This is ridiculous
    ;; but that's because 'pmatch' compares objects with 'eq?', making it
    ;; pretty useless, and it doesn't support ellipses and such.

    (define (quote-pattern s)
      ;; Rewrite the pattern S from pmatch style (a ,b) to match style like
      ;; ('a b).
      (with-ellipsis :::
        (syntax-case s (unquote _ ...)
          ((unquote id) #'id)
          (_ #'_)
          (... #'...)
          (id
           (identifier? #'id)
           #''id)
          ((lst :::) (map quote-pattern #'(lst :::)))
          (pattern #'pattern))))

    (define (match-pattern s)
      ;; Match one pattern without a guard.
      (syntax-case s ()
        ((port (pattern reply) continuation)
         (with-syntax ((pattern (quote-pattern #'pattern)))
           #'(let ((pat 'pattern))
               (converse-debug pat)
               (match (read port)
                 (pattern
                  (let ((data (call-with-values (lambda () reply)
                                list)))
                    (for-each (lambda (obj)
                                (write obj port)
                                (newline port))
                              data)
                    (force-output port)
                    (continuation port)))
                 (sexp
                  (pattern-error pat sexp))))))))

    (syntax-case s ()
      ((_ port (pattern reply) rest ...)
       (match-pattern #'(port (pattern reply)
                              (lambda (port)
                                (converse port rest ...)))))
      ((_ port (pattern guard reply) rest ...)
       #`(let ((skip? (not guard))
               (next  (lambda (p)
                        (converse p rest ...))))
           (if skip?
               (next port)
               #,(match-pattern #'(port (pattern reply) next)))))
      ((_ port)
       #t))))

(define* (choose-locale+keyboard port
                                 #:key
                                 (language "English")
                                 (location "Hong Kong")
                                 (timezone '("Europe" "Zagreb"))
                                 (keyboard
                                  '("English (US)"
                                    "English (intl., with AltGr dead keys)")))
  "Converse over PORT with the guided installer to choose the specified
LANGUAGE, LOCATION, TIMEZONE, and KEYBOARD."
  (converse port
    ((list-selection (title "Locale language")
                     (multiple-choices? #f)
                     (items _))
     language)
    ((list-selection (title "Locale location")
                     (multiple-choices? #f)
                     (items _))
     location)
    ((menu (title "GNU Guix install")
           (text _)
           (items (,guided _ ...)))           ;"Guided graphical installation"
     guided)
    ((list-selection (title "Timezone")
                     (multiple-choices? #f)
                     (items _))
     (first timezone))
    ((list-selection (title "Timezone")
                     (multiple-choices? #f)
                     (items _))
     (second timezone))
    ((list-selection (title "Layout")
                     (multiple-choices? #f)
                     (items _))
     (first keyboard))
    ((list-selection (title "Variant")
                     (multiple-choices? #f)
                     (items _))
     (second keyboard))))

(define* (enter-host-name+passwords port
                                    #:key
                                    (host-name "guix")
                                    (root-password "foo")
                                    (users '(("alice" "pass1")
                                             ("bob" "pass2")
                                             ("charlie" "pass3"))))
  "Converse over PORT with the guided installer to choose HOST-NAME,
ROOT-PASSWORD, and USERS."
  (converse port
    ((input (title "Hostname") (text _) (default _))
     host-name)
    ((input (title "System administrator password") (text _) (default _))
     root-password)
    ((input (title "Password confirmation required") (text _) (default _))
     root-password)
    ((add-users)
     (match users
       (((names passwords) ...)
        (map (lambda (name password)
               `(user (name ,name) (real-name ,(string-titlecase name))
                      (home-directory ,(string-append "/home/" name))
                      (password ,password)))
             names passwords))))))

(define* (choose-services port
                          #:key
                          (choose-desktop-environment? (const #f))
                          (choose-network-service?
                           (lambda (service)
                             (or (string-contains service "SSH")
                                 (string-contains service "NSS"))))
                          (choose-network-management-tool?
                           (lambda (service)
                             (string-contains service "DHCP"))))
  "Converse over PORT to choose networking services."
  (define desktop-environments '())

  (converse port
    ((checkbox-list (title "Desktop environment") (text _)
                    (items ,services))
     (let ((desktops (filter choose-desktop-environment? services)))
       (set! desktop-environments desktops)
       desktops))
    ((checkbox-list (title "Network service") (text _)
                    (items ,services))
     (filter choose-network-service? services))

    ;; The "Network management" dialog shows up only when no desktop
    ;; environments have been selected, hence the guard.
    ((list-selection (title "Network management")
                     (multiple-choices? #f)
                     (items ,services))
     (null? desktop-environments)
     (find choose-network-management-tool? services))))

(define (edit-configuration-file file)
  "Edit FILE, an operating system configuration file generated by the
installer, by adding a marionette service such that the installed OS is
instrumented for further testing."
  (define (read-expressions port)
    (let loop ((result '()))
      (match (read port)
        ((? eof-object?)
         (reverse result))
        (exp
         (loop (cons exp result))))))

  (define (edit exp)
    (match exp
      (('operating-system _ ...)
       `(marionette-operating-system ,exp
                                     #:imported-modules
                                     '((gnu services herd)
                                       (guix build utils)
                                       (guix combinators))))
      (_
       exp)))

  (let ((content (call-with-input-file file read-expressions)))
    (call-with-output-file file
      (lambda (port)
        (format port "\
;; Operating system configuration edited for automated testing.~%~%")

        (pretty-print '(use-modules (gnu tests)) port)
        (for-each (lambda (exp)
                    (pretty-print (edit exp) port)
                    (newline port))
                  content)))

    #t))

(define* (choose-partitioning port
                              #:key
                              (encrypted? #t)
                              (passphrase "thepassphrase")
                              (edit-configuration-file
                               edit-configuration-file))
  "Converse over PORT to choose the partitioning method.  When ENCRYPTED? is
true, choose full-disk encryption with PASSPHRASE as the LUKS passphrase.
This conversation goes past the final dialog box that shows the configuration
file, actually starting the installation process."
  (converse port
    ((list-selection (title "Partitioning method")
                     (multiple-choices? #f)
                     (items (,not-encrypted ,encrypted _ ...)))
     (if encrypted?
         encrypted
         not-encrypted))
    ((list-selection (title "Disk") (multiple-choices? #f)
                     (items (,disks ...)))
     ;; When running the installation from an ISO image, the CD/DVD drive
     ;; shows up in the list.  Avoid it.
     (find (lambda (disk)
             (not (or (string-contains disk "DVD")
                      (string-contains disk "CD-ROM"))))
           disks))

    ;; The "Partition table" dialog pops up only if there's not already a
    ;; partition table.
    ((list-selection (title "Partition table")
                     (multiple-choices? #f)
                     (items _))
     "gpt")
    ((list-selection (title "Partition scheme")
                     (multiple-choices? #f)
                     (items (,one-partition _ ...)))
     one-partition)
    ((list-selection (title "Guided partitioning")
                     (multiple-choices? #f)
                     (items (,disk _ ...)))
     disk)
    ((input (title "Password required")
            (text _) (default #f))
     encrypted?                                   ;only when ENCRYPTED?
     passphrase)
    ((input (title "Password confirmation required")
            (text _) (default #f))
     encrypted?
     passphrase)
    ((confirmation (title "Format disk?") (text _))
     #t)
    ((info (title "Preparing partitions") _ ...)
     (values))                                    ;nothing to return
    ((file-dialog (title "Configuration file")
                  (text _)
                  (file ,configuration-file))
     (edit-configuration-file configuration-file))))

(define (conclude-installation port)
  "Conclude the installation by checking over PORT that we get the final
messages once the 'guix system init' process has completed."
  (converse port
    ((pause)                                      ;"Press Enter to continue."
     #t)
    ((installation-complete)                      ;congratulations!
     (values))))

;;; Local Variables:
;;; eval: (put 'converse 'scheme-indent-function 1)
;;; eval: (put 'with-ellipsis 'scheme-indent-function 1)
;;; End:


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer timezone)
  #:use-module (gnu installer utils)
  #:use-module (guix i18n)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:use-module (srfi srfi-34)
  #:use-module (srfi srfi-35)
  #:use-module (ice-9 match)
  #:use-module (ice-9 receive)
  #:export (locate-children
            timezone->posix-tz
            timezone-has-child?
            zonetab->timezone-tree
            posix-tz->configuration))

(define %not-blank
  (char-set-complement char-set:blank))

(define (posix-tz->timezone tz)
  "Convert given TZ in Posix format like \"Europe/Paris\" into a list like
(\"Europe\" \"Paris\")."
  (string-split tz #\/))

(define (timezone->posix-tz timezone)
  "Convert given TIMEZONE like (\"Europe\" \"Paris\") into a Posix timezone
like \"Europe/Paris\"."
  (string-join timezone "/"))

(define (zonetab->timezones zonetab)
  "Parse ZONETAB file and return the corresponding list of timezones."

  (define (zonetab-line->posix-tz line)
    (let ((tokens (string-tokenize line %not-blank)))
      (match tokens
        ((code coordinates tz _ ...)
         tz))))

  (call-with-input-file zonetab
    (lambda (port)
      (let* ((lines (read-lines port))
             ;; Filter comment lines starting with '#' character.
             (tz-lines (filter (lambda (line)
                                 (not (eq? (string-ref line 0)
                                           #\#)))
                               lines)))
        (map (lambda (line)
               (posix-tz->timezone
                (zonetab-line->posix-tz line)))
             tz-lines)))))

(define (timezones->timezone-tree timezones)
  "Convert the list of timezones, TIMEZONES into a tree under the form:

	(\"America\" (\"North_Dakota\" \"New_Salem\" \"Center\"))

representing America/North_Dakota/New_Salem and America/North_Dakota/Center
timezones."

  (define (remove-first lists)
    "Remove the first element of every sublists in the argument LISTS."
    (map (lambda (list)
           (if (null? list) list (cdr list)))
         lists))

  (let loop ((cur-timezones timezones))
    (match cur-timezones
      (() '())
      (((region . rest-region) . rest-timezones)
       (if (null? rest-region)
           (cons (list region) (loop rest-timezones))
           (receive (same-region other-region)
               (partition (lambda (timezone)
                            (string=? (car timezone) region))
                          cur-timezones)
             (acons region
                    (loop (remove-first same-region))
                    (loop other-region))))))))

(define (locate-children tree path)
  "Return the children of the timezone indicated by PATH in the given
TREE. Raise a condition if the PATH could not be found."
  (let ((extract-proc (cut map car <>)))
    (match path
      (() (sort (extract-proc tree) string<?))
      ((region . rest)
       (or (and=> (assoc-ref tree region)
                  (cut locate-children <> rest))
           (raise
            (condition
             (&message
              (message
               (format #f (G_ "Unable to locate path: ~a.") path))))))))))

(define (timezone-has-child? tree timezone)
  "Return #t if the given TIMEZONE any child in TREE and #f otherwise."
  (not (null? (locate-children tree timezone))))

(define* (zonetab->timezone-tree zonetab)
  "Return the timezone tree corresponding to the given ZONETAB file."
  (timezones->timezone-tree (zonetab->timezones zonetab)))

;;;
;;; Configuration formatter.
;;;

(define (posix-tz->configuration timezone)
  "Return the configuration field for TIMEZONE."
  `((timezone ,timezone)))


code:
;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2018 Mathieu Othacehe <m.othacehe@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu installer user)
  #:use-module (guix records)
  #:use-module (srfi srfi-1)
  #:export (<user>
            user
            make-user
            user-name
            user-real-name
            user-group
            user-home-directory
            user-password

            users->configuration))

(define-record-type* <user>
  user make-user
  user?
  (name            user-name)
  (real-name       user-real-name
                   (default ""))
  (group           user-group
                   (default "users"))
  (password        user-password)
  (home-directory  user-home-directory))

(define (users->configuration users)
  "Return the configuration field for USERS."
  (define (user->sexp user)
    `(user-account
      (name ,(user-name user))
      (comment ,(user-real-name user))
      (group ,(user-group user))
      (home-directory ,(user-home-directory user))
      (supplementary-groups '("wheel" "netdev"
                              "audio" "video"))))

  `((users (cons*
            ,@(filter-map (lambda (user)
                            ;; Do not emit a 'user-account' form for "root".
                            (and (not (string=? (user-name user) "root"))
                                 (user->sexp user)))
                          users)
            %base-user-accounts))))