Merge branch 'ph/checkout'

diff --git a/read-cache.c b/read-cache.c
index ac9a8e7e323bb7b0728b2b199ab4f4a9bc5ce22f..a50a851125db765f06f3869873623bf7592de405 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;
 }
 
@@ -512,7 +528,7 @@ int add_to_index(struct index_state *istate, const char *path, struct stat *st,
                ce = create_alias_ce(ce, alias);
        ce->ce_flags |= CE_ADDED;
 
-       /* It was suspected to be recily clean, but it turns out to be Ok */
+       /* It was suspected to be racily clean, but it turns out to be Ok */
        was_same = (alias &&
                    !ce_stage(alias) &&
                    !hashcmp(alias->sha1, ce->sha1) &&
@@ -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;
@@ -955,7 +980,10 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p
        int not_new = (flags & REFRESH_IGNORE_MISSING) != 0;
        int ignore_submodules = (flags & REFRESH_IGNORE_SUBMODULES) != 0;
        unsigned int options = really ? CE_MATCH_IGNORE_VALID : 0;
+       const char *needs_update_message;
 
+       needs_update_message = ((flags & REFRESH_SAY_CHANGED)
+                               ? "locally modified" : "needs update");
        for (i = 0; i < istate->cache_nr; i++) {
                struct cache_entry *ce, *new;
                int cache_errno = 0;
@@ -994,7 +1022,7 @@ int refresh_index(struct index_state *istate, unsigned int flags, const char **p
                        }
                        if (quiet)
                                continue;
-                       printf("%s: needs update\n", ce->name);
+                       printf("%s: %s\n", ce->name, needs_update_message);
                        has_errors = 1;
                        continue;
                }
@@ -1385,3 +1413,34 @@ int write_index(const struct index_state *istate, int newfd)
        }
        return ce_flush(&c, newfd);
 }
+
+/*
+ * Read the index file that is potentially unmerged into given
+ * index_state, dropping any unmerged entries.  Returns true is
+ * the index is unmerged.  Callers who want to refuse to work
+ * from an unmerged state can call this and check its return value,
+ * instead of calling read_cache().
+ */
+int read_index_unmerged(struct index_state *istate)
+{
+       int i;
+       struct cache_entry **dst;
+       struct cache_entry *last = NULL;
+
+       read_index(istate);
+       dst = istate->cache;
+       for (i = 0; i < istate->cache_nr; i++) {
+               struct cache_entry *ce = istate->cache[i];
+               if (ce_stage(ce)) {
+                       remove_name_hash(ce);
+                       if (last && !strcmp(ce->name, last->name))
+                               continue;
+                       cache_tree_invalidate_path(istate->cache_tree, ce->name);
+                       last = ce;
+                       continue;
+               }
+               *dst++ = ce;
+       }
+       istate->cache_nr = dst - istate->cache;
+       return !!last;
+}