[PATCH 1/3] read-cache: use shared perms when writing shared index

[Christian Couder <christian.couder@gmail.com>]

Since f6ecc62dbf (write_shared_index(): use tempfile module, 2015-08-10)
write_shared_index() has been using mks_tempfile() to create the
temporary file that will become the shared index.

But even before that, it looks like the functions used to create this
file didn't call adjust_shared_perm(), which means that the shared
index file has always been created with 600 permissions regardless
of the shared permission settings.

This means that on repositories created with `git init --shared=all`
and using the split index feature one gets an error like:

fatal: .git/sharedindex.a52f910b489bc462f187ab572ba0086f7b5157de: index file open failed: Permission denied

when another user performs any operation that reads the shared index.

Let's fix that by using create_tempfile() instead of mks_tempfile()
to create the shared index file.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 read-cache.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/read-cache.c b/read-cache.c
index bc156a133e..eb71e93aa4 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2414,7 +2414,7 @@ static int write_shared_index(struct index_state *istate,
 	struct split_index *si = istate->split_index;
 	int fd, ret;
 
-	fd = mks_tempfile(&temporary_sharedindex, git_path("sharedindex_XXXXXX"));
+	fd = create_tempfile(&temporary_sharedindex, git_path("sharedindex_XXXXXX"));
 	if (fd < 0) {
 		hashclr(si->base_sha1);
 		return do_write_locked_index(istate, lock, flags);
-- 
2.13.1.516.g05ec6e13aa