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[PATCH] setup: avoid double slashes when looking for HEAD

From: Jeff King <peff@xxxxxxxx>

Andrew Baumann reported that when called outside of any Git worktree,
`git rev-parse --is-inside-work-tree` eventually tries to access
`//HEAD`, i.e.  any `HEAD` file in the root directory, but with a double

This double slash is not only unintentional, but is allowed by the POSIX
standard to have a special meaning. And most notably on Windows, it
does, where it refers to a UNC path of the form `//server/share/`.

As a consequence, afore-mentioned `rev-parse` call not only looks for
the wrong thing, but it also causes serious delays, as Windows will try
to access a server called `HEAD`.  Let's simply avoid the unintended
double slash.

Signed-off-by: Jeff King <peff@xxxxxxxx>
Acked-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
Published-As: https://github.com/dscho/git/releases/tag/double-slash-HEAD-v1
Fetch-It-Via: git fetch https://github.com/dscho/git double-slash-HEAD-v1

	And here it is, as a proper, easy-to-pull branch, and also in the
	form Junio prefers.

 setup.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/setup.c b/setup.c
index 03f51e056cd..94768512b79 100644
--- a/setup.c
+++ b/setup.c
@@ -312,7 +312,9 @@ int is_git_directory(const char *suspect)
 	size_t len;
 	/* Check worktree-related signatures */
-	strbuf_addf(&path, "%s/HEAD", suspect);
+	strbuf_addstr(&path, suspect);
+	strbuf_complete(&path, '/');
+	strbuf_addstr(&path, "HEAD");
 	if (validate_headref(path.buf))
 		goto done;

base-commit: cb5918aa0d50f50e83787f65c2ddc3dcb10159fe