Merge branch 'sb/rerere-lib'

diff --git a/read-cache.c b/read-cache.c
index 47dd2013fb937c6aaaf9fecd156c87f44fee4780..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;
 }
 
@@ -462,15 +478,17 @@ static struct cache_entry *create_alias_ce(struct cache_entry *ce, struct cache_
        return new;
 }
 
-int add_to_index(struct index_state *istate, const char *path, struct stat *st, int verbose)
+int add_to_index(struct index_state *istate, const char *path, struct stat *st, int flags)
 {
-       int size, namelen;
+       int size, namelen, was_same;
        mode_t st_mode = st->st_mode;
        struct cache_entry *ce, *alias;
        unsigned ce_option = CE_MATCH_IGNORE_VALID|CE_MATCH_RACY_IS_DIRTY;
+       int verbose = flags & (ADD_CACHE_VERBOSE | ADD_CACHE_PRETEND);
+       int pretend = flags & ADD_CACHE_PRETEND;
 
        if (!S_ISREG(st_mode) && !S_ISLNK(st_mode) && !S_ISDIR(st_mode))
-               die("%s: can only add regular files, symbolic links or git-directories", path);
+               return error("%s: can only add regular files, symbolic links or git-directories", path);
 
        namelen = strlen(path);
        if (S_ISDIR(st_mode)) {
@@ -505,23 +523,32 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
                return 0;
        }
        if (index_path(ce->sha1, path, st, 1))
-               die("unable to index file %s", path);
+               return error("unable to index file %s", path);
        if (ignore_case && alias && different_name(ce, alias))
                ce = create_alias_ce(ce, alias);
        ce->ce_flags |= CE_ADDED;
-       if (add_index_entry(istate, ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE))
-               die("unable to add %s to index",path);
-       if (verbose)
+
+       /* It was suspected to be recily clean, but it turns out to be Ok */
+       was_same = (alias &&
+                   !ce_stage(alias) &&
+                   !hashcmp(alias->sha1, ce->sha1) &&
+                   ce->ce_mode == alias->ce_mode);
+
+       if (pretend)
+               ;
+       else if (add_index_entry(istate, ce, ADD_CACHE_OK_TO_ADD|ADD_CACHE_OK_TO_REPLACE))
+               return error("unable to add %s to index",path);
+       if (verbose && !was_same)
                printf("add '%s'\n", path);
        return 0;
 }
 
-int add_file_to_index(struct index_state *istate, const char *path, int verbose)
+int add_file_to_index(struct index_state *istate, const char *path, int flags)
 {
        struct stat st;
        if (lstat(path, &st))
                die("%s: unable to stat (%s)", path, strerror(errno));
-       return add_to_index(istate, path, &st, verbose);
+       return add_to_index(istate, path, &st, flags);
 }
 
 struct cache_entry *make_cache_entry(unsigned int mode,
@@ -882,6 +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;