Teach "git apply" to prepend a prefix with "--root=<root>"

[git.git] / read-cache.c

diff --git a/read-cache.c b/read-cache.c
index ac9a8e7e323bb7b0728b2b199ab4f4a9bc5ce22f..f83de8c4158e08bab3e0445c4d15caf2d4d105aa 100644 (file)
--- a/read-cache.c
+++ b/read-cache.c
@@ -138,6 +138,16 @@ static int ce_modified_check_fs(struct cache_entry *ce, struct stat *st)
        return 0;
 }
 
+static int is_empty_blob_sha1(const unsigned char *sha1)
+{
+       static const unsigned char empty_blob_sha1[20] = {
+               0xe6,0x9d,0xe2,0x9b,0xb2,0xd1,0xd6,0x43,0x4b,0x8b,
+               0x29,0xae,0x77,0x5a,0xd8,0xc2,0xe4,0x8c,0x53,0x91
+       };
+
+       return !hashcmp(sha1, empty_blob_sha1);
+}
+
 static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st)
 {
        unsigned int changed = 0;
@@ -193,6 +203,12 @@ static int ce_match_stat_basic(struct cache_entry *ce, struct stat *st)
        if (ce->ce_size != (unsigned int) st->st_size)
                changed |= DATA_CHANGED;
 
+       /* Racily smudged entry? */
+       if (!ce->ce_size) {
+               if (!is_empty_blob_sha1(ce->sha1))
+                       changed |= DATA_CHANGED;
+       }
+
        return changed;
 }
 
@@ -893,6 +909,15 @@ static struct cache_entry *refresh_cache_ent(struct index_state *istate,
        if (ce_uptodate(ce))
                return ce;
 
+       /*
+        * CE_VALID means the user promised us that the change to
+        * the work tree does not matter and told us not to worry.
+        */
+       if (!ignore_valid && (ce->ce_flags & CE_VALID)) {
+               ce_mark_uptodate(ce);
+               return ce;
+       }
+
        if (lstat(ce->name, &st) < 0) {
                if (err)
                        *err = errno;