[PATCH v2 1/2] create_default_files(): don't set u+x bit on $GIT_DIR/config

[Michael Haggerty <mhagger@alum.mit.edu>]

Since time immemorial, the test of whether to set "core.filemode" has
been done by trying to toggle the u+x bit on $GIT_DIR/config and then
testing whether the change "took". It is somewhat odd to use the
config file for this test, but whatever.

The test code didn't set the u+x bit back to its original state
itself, instead relying on the subsequent call to git_config_set() to
re-write the config file with correct permissions.

But ever since

    daa22c6f8d config: preserve config file permissions on edits (2014-05-06)

git_config_set() copies the permissions from the old config file to
the new one. This is a good change in and of itself, but it interacts
badly with create_default_files()'s sloppiness, causing "git init" to
leave the executable bit set on $GIT_DIR/config.

So change create_default_files() to reset the permissions on
$GIT_DIR/config after its test.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 builtin/init-db.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/builtin/init-db.c b/builtin/init-db.c
index 56f85e2..4c8021d 100644
--- a/builtin/init-db.c
+++ b/builtin/init-db.c
@@ -255,6 +255,7 @@ static int create_default_files(const char *template_path)
 		filemode = (!chmod(path, st1.st_mode ^ S_IXUSR) &&
 				!lstat(path, &st2) &&
 				st1.st_mode != st2.st_mode);
+		filemode &= !chmod(path, st1.st_mode);
 	}
 	git_config_set("core.filemode", filemode ? "true" : "false");
 
-- 
2.1.1