completion: respect $GIT_DIR

The __gitdir() helper function finds out the path of the git repository by running 'git rev-parse --git-dir'. However, it has a shortcut first to avoid the overhead of running a git command in a subshell when the current directory is at the top of the work tree, i.e. when it contains a '.git' subdirectory. If the 'GIT_DIR' environment variable is set then it specifies the path to the git repository, and the autodetection of the '.git' directory is not necessary. However, $GIT_DIR is only taken into acocunt by 'git rev-parse --git-dir', and the check for the '.git' subdirectory is performed first, so it wins over the path given in $GIT_DIR. There are several completion (helper) functions that depend on __gitdir(), and when the above case triggers the completion script will do weird things, like offering refs, aliases, or stashes from a different repository, or displaying wrong or broken prompt, etc. So check first whether $GIT_DIR is set, and only proceed with checking the '.git' directory in the current directory if it isn't. 'git rev-parse' would also check whether the path in $GIT_DIR is a proper '.git' directory, i.e. 'HEAD', 'refs/', and 'objects/' are present and accessible, but we don't have to be that thorough for the bash prompt. And we've lived with an equally permissive check for '.git' in the current working directory for years anyway. Signed-off-by: SZEDER Gábor <szeder@ira.uka.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>