Check the directory containing the script too.
Check the directory containing the script too.

Use $HOME instead of /home to check for the 'root' drive.
It could be an nfs dir but /home is often not very useful to check since it's
not mapped to a writeable partition.

R=cmp@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/9113015

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@116517 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build