debian/patches/update-index-stat-updated-files-earlier.diff

From 8fb8d8ca3122affc447e81d61588081dc5107bff Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Mon, 14 May 2018 11:00:56 -0400
Subject: update-index: stat updated files earlier

commit eb12dd0c764d2b71bebd5ffffb7379a3835253ae upstream.

In the update_one(), we check verify_path() on the proposed
path before doing anything else. In preparation for having
verify_path() look at the file mode, let's stat the file
earlier, so we can check the mode accurately.

This is made a bit trickier by the fact that this function
only does an lstat in a few code paths (the ones that flow
down through process_path()). So we can speculatively do the
lstat() here and pass the results down, and just use a dummy
mode for cases where we won't actually be updating the index
from the filesystem.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
---
 builtin/update-index.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/builtin/update-index.c b/builtin/update-index.c
index f3f07e7f1c..e14f928a63 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -354,10 +354,9 @@ static int process_directory(const char *path, int len, struct stat *st)
 	return error("%s: is a directory - add files inside instead", path);
 }
 
-static int process_path(const char *path)
+static int process_path(const char *path, struct stat *st, int stat_errno)
 {
 	int pos, len;
-	struct stat st;
 	const struct cache_entry *ce;
 
 	len = strlen(path);
@@ -381,13 +380,13 @@ static int process_path(const char *path)
 	 * First things first: get the stat information, to decide
 	 * what to do about the pathname!
 	 */
-	if (lstat(path, &st) < 0)
-		return process_lstat_error(path, errno);
+	if (stat_errno)
+		return process_lstat_error(path, stat_errno);
 
-	if (S_ISDIR(st.st_mode))
-		return process_directory(path, len, &st);
+	if (S_ISDIR(st->st_mode))
+		return process_directory(path, len, st);
 
-	return add_one_path(ce, path, len, &st);
+	return add_one_path(ce, path, len, st);
 }
 
 static int add_cacheinfo(unsigned int mode, const struct object_id *oid,
@@ -439,6 +438,16 @@ static void chmod_path(char flip, const char *path)
 
 static void update_one(const char *path)
 {
+	int stat_errno = 0;
+	struct stat st;
+
+	if (mark_valid_only || mark_skip_worktree_only || force_remove)
+		st.st_mode = 0;
+	else if (lstat(path, &st) < 0) {
+		st.st_mode = 0;
+		stat_errno = errno;
+	} /* else stat is valid */
+
 	if (!verify_path(path)) {
 		fprintf(stderr, "Ignoring path %s\n", path);
 		return;
@@ -460,7 +469,7 @@ static void update_one(const char *path)
 		report("remove '%s'", path);
 		return;
 	}
-	if (process_path(path))
+	if (process_path(path, &st, stat_errno))
 		die("Unable to process path %s", path);
 	report("add '%s'", path);
 }
-- 
2.17.0.921.gf22659ad46