From: Jeff Hostetler <jeffh...@microsoft.com>

Teach do_write_index() to close the index.lock file
before getting the mtime and updating the istate.timestamp
fields.

On Windows, a file's mtime is not updated until the file is
closed.  On Linux, the mtime is set after the last flush.

Signed-off-by: Jeff Hostetler <jeffh...@microsoft.com>
Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
Published-As: https://github.com/dscho/git/releases/tag/do-write-index-mtime-v1
Fetch-It-Via: git fetch https://github.com/dscho/git do-write-index-mtime-v1

 read-cache.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/read-cache.c b/read-cache.c
index 008b335844c..b0276fd5510 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2051,9 +2051,10 @@ void update_index_if_able(struct index_state *istate, 
struct lock_file *lockfile
                rollback_lock_file(lockfile);
 }
 
-static int do_write_index(struct index_state *istate, int newfd,
+static int do_write_index(struct index_state *istate, struct tempfile 
*tempfile,
                          int strip_extensions)
 {
+       int newfd = tempfile->fd;
        git_SHA_CTX c;
        struct cache_header hdr;
        int i, err, removed, extended, hdr_version;
@@ -2162,7 +2163,11 @@ static int do_write_index(struct index_state *istate, 
int newfd,
                        return -1;
        }
 
-       if (ce_flush(&c, newfd, istate->sha1) || fstat(newfd, &st))
+       if (ce_flush(&c, newfd, istate->sha1))
+               return -1;
+       if (close_tempfile(tempfile))
+               return error(_("could not close '%s'"), tempfile->filename.buf);
+       if (lstat(tempfile->filename.buf, &st))
                return -1;
        istate->timestamp.sec = (unsigned int)st.st_mtime;
        istate->timestamp.nsec = ST_MTIME_NSEC(st);
@@ -2185,7 +2190,7 @@ static int commit_locked_index(struct lock_file *lk)
 static int do_write_locked_index(struct index_state *istate, struct lock_file 
*lock,
                                 unsigned flags)
 {
-       int ret = do_write_index(istate, get_lock_file_fd(lock), 0);
+       int ret = do_write_index(istate, &lock->tempfile, 0);
        if (ret)
                return ret;
        assert((flags & (COMMIT_LOCK | CLOSE_LOCK)) !=
@@ -2282,7 +2287,7 @@ static int write_shared_index(struct index_state *istate,
                return do_write_locked_index(istate, lock, flags);
        }
        move_cache_to_base_index(istate);
-       ret = do_write_index(si->base, fd, 1);
+       ret = do_write_index(si->base, &temporary_sharedindex, 1);
        if (ret) {
                delete_tempfile(&temporary_sharedindex);
                return ret;

base-commit: e2cb6ab84c94f147f1259260961513b40c36108a
-- 
2.12.2.windows.2.800.gede8f145e06

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