raise OSError including the error message derived from errno
raise OSError including the error message derived from errno

also: deal with path being a integer FD

edgimar/borg,raxenak/borg,RonnyPfannschmidt/borg,edgimar/borg,edgewood/borg,raxenak/borg,edgimar/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,edgewood/borg,raxenak/borg,edgimar/borg,RonnyPfannschmidt/borg,edgewood/borg,RonnyPfannschmidt/borg,raxenak/borg,edgewood/borg