gitk: Simplify calculation of gitdir
Since 5024baa4 ([PATCH] Make gitk work when launched in a subdirectory, 2007-01-09), gitk has used 'git rev-parse --git-dir' to find the .git directory. However, gitk still first checks for the $GIT_DIR environment variable and that the value returned from git-rev-parse does not point to a file. Since git-rev-parse does both of these checks already, the checks can safely be removed from gitk. This makes the gitdir procedure small enough to inline. This cleanup introduces a UI regression in that the error message will now be "Cannot find a git repository here." even in the case where GIT_DIR points to a file, for which the error message was previously "Cannot find the git directory \"%s\".". It should be noted, though, that even before this patch, 'gitk --git-dir=path/to/some/file' would give the former error message. Signed-off-by: NMartin von Zweigbergk <martin.von.zweigbergk@gmail.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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