Add "--git-dir" flag to git-rev-parse

From: Linus Torvalds <torvalds@osdl.org>
Date: Sep 18, 2005, 18:18 UTC
Message-ID: <Pine.LNX.4.58.0509181114190.26803@g5.osdl.org>

Especially when you're deep inside the git repository, it's not all that trivial for scripts to figure out where GIT_DIR is if it isn't set.

So add a flag to git-rev-parse to show where it is, since it will have figured it out anyway.

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/rev-parse.c b/rev-parse.c
--- a/rev-parse.c
+++ b/rev-parse.c
@@ -191,6 +191,22 @@ int main(int argc, char **argv)
 					puts(prefix);
 				continue;
 			}
+			if (!strcmp(arg, "--git-dir")) {
+				const char *gitdir = getenv(GIT_DIR_ENVIRONMENT);
+				static char cwd[PATH_MAX];
+				if (gitdir) {
+					puts(gitdir);
+					continue;
+				}
+				if (!prefix) {
+					puts(".git");
+					continue;
+				}
+				if (!getcwd(cwd, PATH_MAX))
+					die("unable to get current working directory");
+				printf("%s/.git\n", cwd);
+				continue;
+			}
 			if (verify)
 				die("Needed a single revision");
 			show_flag(arg);