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git-sh-setup: move the repository check to a core program.
Any core commands that use setup_git_directory() now check if given GIT_DIR is really a valid repository, so the same check in git-sh-setup can use it without reimplementing it in shell. This commit changes git-sh-setup to use git-var command for that, although any other commands would do. Note that we export GIT_DIR explicitly when calling git-var; without it, the caller of this script would use GIT_DIR that we return (which is to assume ./.git unless the caller has it elsewhere) while git-var would go up to find a .git directory in our parent directories, which would be checking a different directory from what our callers will be using. Signed-off-by: Junio C Hamano <junkio@cox.net>
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