Merge branch 'mk/diff'

* mk/diff:
  Diff between two blobs should take mode changes into account now.
  use mode of the tree in git-diff, if <tree>:<file> syntax is used
  store mode in rev_list, if <tree>:<filename> syntax is used
  add add_object_array_with_mode
  add get_sha1_with_mode
  Add S_IFINVALID mode

builtin-diff.c

@@ -13,13 +13,10 @@
 #include "log-tree.h"
 #include "builtin.h"
 
-/* NEEDSWORK: struct object has place for name but we _do_
- * know mode when we extracted the blob out of a tree, which
- * we currently lose.
- */
 struct blobinfo {
 	unsigned char sha1[20];
 	const char *name;
+	unsigned mode;
 };
 
 static const char builtin_diff_usage[] =
@@ -35,7 +32,7 @@ static void stuff_change(struct diff_options *opt,
 	struct diff_filespec *one, *two;
 
 	if (!is_null_sha1(old_sha1) && !is_null_sha1(new_sha1) &&
-	    !hashcmp(old_sha1, new_sha1))
+	    !hashcmp(old_sha1, new_sha1) && (old_mode == new_mode))
 		return;
 
 	if (opt->reverse_diff) {
@@ -70,8 +67,12 @@ static int builtin_diff_b_f(struct rev_info *revs,
 		die("'%s': %s", path, strerror(errno));
 	if (!(S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)))
 		die("'%s': not a regular file or symlink", path);
+
+	if (blob[0].mode == S_IFINVALID)
+		blob[0].mode = canon_mode(st.st_mode);
+
 	stuff_change(&revs->diffopt,
-		     canon_mode(st.st_mode), canon_mode(st.st_mode),
+		     blob[0].mode, canon_mode(st.st_mode),
 		     blob[0].sha1, null_sha1,
 		     path, path);
 	diffcore_std(&revs->diffopt);
@@ -88,8 +89,14 @@ static int builtin_diff_blobs(struct rev_info *revs,
 	if (argc > 1)
 		usage(builtin_diff_usage);
 
+	if (blob[0].mode == S_IFINVALID)
+		blob[0].mode = mode;
+
+	if (blob[1].mode == S_IFINVALID)
+		blob[1].mode = mode;
+
 	stuff_change(&revs->diffopt,
-		     mode, mode,
+		     blob[0].mode, blob[1].mode,
 		     blob[0].sha1, blob[1].sha1,
 		     blob[0].name, blob[1].name);
 	diffcore_std(&revs->diffopt);
@@ -272,6 +279,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
 				die("more than two blobs given: '%s'", name);
 			hashcpy(blob[blobs].sha1, obj->sha1);
 			blob[blobs].name = name;
+			blob[blobs].mode = list->mode;
 			blobs++;
 			continue;
 

cache.h

@@ -24,6 +24,9 @@
 #define DTYPE(de)	DT_UNKNOWN
 #endif
 
+/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
+#define S_IFINVALID     0030000
+
 /*
  * A "directory link" is a link to another git directory.
  *
@@ -339,6 +342,7 @@ static inline unsigned int hexval(unsigned int c)
 #define DEFAULT_ABBREV 7
 
 extern int get_sha1(const char *str, unsigned char *sha1);
+extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 extern char *sha1_to_hex(const unsigned char *sha1);	/* static buffer result! */
 extern int read_ref(const char *filename, unsigned char *sha1);

object.c

@@ -230,6 +230,11 @@ int object_list_contains(struct object_list *list, struct object *obj)
 }
 
 void add_object_array(struct object *obj, const char *name, struct object_array *array)
+{
+	add_object_array_with_mode(obj, name, array, S_IFINVALID);
+}
+
+void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode)
 {
 	unsigned nr = array->nr;
 	unsigned alloc = array->alloc;
@@ -243,5 +248,6 @@ void add_object_array(struct object *obj, const char *name, struct object_array
 	}
 	objects[nr].item = obj;
 	objects[nr].name = name;
+	objects[nr].mode = mode;
 	array->nr = ++nr;
 }

object.h

@@ -17,6 +17,7 @@ struct object_array {
 	struct object_array_entry {
 		struct object *item;
 		const char *name;
+		unsigned mode;
 	} *objects;
 };
 
@@ -77,5 +78,6 @@ int object_list_contains(struct object_list *list, struct object *obj);
 
 /* Object array handling .. */
 void add_object_array(struct object *obj, const char *name, struct object_array *array);
+void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode);
 
 #endif /* OBJECT_H */

revision.c

@@ -115,10 +115,15 @@ void mark_parents_uninteresting(struct commit *commit)
 }
 
 void add_pending_object(struct rev_info *revs, struct object *obj, const char *name)
+{
+	add_pending_object_with_mode(revs, obj, name, S_IFINVALID);
+}
+
+void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode)
 {
 	if (revs->no_walk && (obj->flags & UNINTERESTING))
 		die("object ranges do not make sense when not walking revisions");
-	add_object_array(obj, name, &revs->pending);
+	add_object_array_with_mode(obj, name, &revs->pending, mode);
 	if (revs->reflog_info && obj->type == OBJ_COMMIT)
 		add_reflog_for_walk(revs->reflog_info,
 				(struct commit *)obj, name);
@@ -723,6 +728,7 @@ int handle_revision_arg(const char *arg, struct rev_info *revs,
 			int flags,
 			int cant_be_filename)
 {
+	unsigned mode;
 	char *dotdot;
 	struct object *object;
 	unsigned char sha1[20];
@@ -796,12 +802,12 @@ int handle_revision_arg(const char *arg, struct rev_info *revs,
 		local_flags = UNINTERESTING;
 		arg++;
 	}
-	if (get_sha1(arg, sha1))
+	if (get_sha1_with_mode(arg, sha1, &mode))
 		return -1;
 	if (!cant_be_filename)
 		verify_non_filename(revs->prefix, arg);
 	object = get_reference(revs, arg, sha1, flags ^ local_flags);
-	add_pending_object(revs, object, arg);
+	add_pending_object_with_mode(revs, object, arg, mode);
 	return 0;
 }
 
@@ -1177,10 +1183,11 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, const ch
 	if (def && !revs->pending.nr) {
 		unsigned char sha1[20];
 		struct object *object;
-		if (get_sha1(def, sha1))
+		unsigned mode;
+		if (get_sha1_with_mode(def, sha1, &mode))
 			die("bad default revision '%s'", def);
 		object = get_reference(revs, def, sha1, 0);
-		add_pending_object(revs, object, def);
+		add_pending_object_with_mode(revs, object, def, mode);
 	}
 
 	if (revs->topo_order)

revision.h

@@ -131,5 +131,6 @@ extern void add_object(struct object *obj,
 		       const char *name);
 
 extern void add_pending_object(struct rev_info *revs, struct object *obj, const char *name);
+extern void add_pending_object_with_mode(struct rev_info *revs, struct object *obj, const char *name, unsigned mode);
 
 #endif

sha1_name.c

@@ -643,11 +643,17 @@ static int get_sha1_oneline(const char *prefix, unsigned char *sha1)
  */
 int get_sha1(const char *name, unsigned char *sha1)
 {
-	int ret, bracket_depth;
 	unsigned unused;
+	return get_sha1_with_mode(name, sha1, &unused);
+}
+
+int get_sha1_with_mode(const char *name, unsigned char *sha1, unsigned *mode)
+{
+	int ret, bracket_depth;
 	int namelen = strlen(name);
 	const char *cp;
 
+	*mode = S_IFINVALID;
 	prepare_alt_odb();
 	ret = get_sha1_1(name, namelen, sha1);
 	if (!ret)
@@ -685,6 +691,7 @@ int get_sha1(const char *name, unsigned char *sha1)
 				break;
 			if (ce_stage(ce) == stage) {
 				hashcpy(sha1, ce->sha1);
+				*mode = ntohl(ce->ce_mode);
 				return 0;
 			}
 			pos++;
@@ -703,7 +710,7 @@ int get_sha1(const char *name, unsigned char *sha1)
 		unsigned char tree_sha1[20];
 		if (!get_sha1_1(name, cp-name, tree_sha1))
 			return get_tree_entry(tree_sha1, cp+1, sha1,
-					      &unused);
+					      mode);
 	}
 	return ret;
 }