Commit ce9b8aab5 (setup_git_directory_1(): avoid changing global state,
2017-03-13) changed how the git directory is discovered, and as a side
effect when the discovery reaches the root directory Git tries to
access paths like '//HEAD' and '//objects'. This interacts badly with
Cygwin, which interprets it as a UNC file share, and so demand-loads a
bunch of extra DLLs and attempts to resolve/contact the server named
HEAD. This obviously doesn't work too well, especially over a slow
network link.
Special case the root directory in is_git_directory() to prevent
accessing paths with leading double slashes.
Reported-by: Andrew Baumann <andrew.baum...@microsoft.com>
Signed-off-by: SZEDER Gábor <szeder....@gmail.com>
---
I'm not quite sure whether this is the right or complete fix. I can't
test it on Cygwin, and I don't know whether Git for Windows is
affected with it's drive prefixes in paths. Anyway, at least strace
output on Linux looks good to me.
setup.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/setup.c b/setup.c
index 03f51e056..0cfc5e676 100644
--- a/setup.c
+++ b/setup.c
@@ -311,6 +311,10 @@ int is_git_directory(const char *suspect)
int ret = 0;
size_t len;
+ /* To avoid accessing '//HEAD' & co when checking the root directory */
+ if (!strcmp(suspect, "/"))
+ suspect = "";
+
/* Check worktree-related signatures */
strbuf_addf(&path, "%s/HEAD", suspect);
if (validate_headref(path.buf))
--
2.15.0.67.gb67a46776
