X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=read-tree.c;h=aa6172b52eeadb4f118e5145c182270342a70bf0;hb=aedb8995f841949ce29e05ea7e5c03c2d5466089;hp=66c0120f1352f8edf6ea1afcd037c96b373273a8;hpb=fc71b89fb61fd2ca98dad481cc44671e7680f9ce;p=git.git

diff --git a/read-tree.c b/read-tree.c
index 66c0120f1..aa6172b52 100644
--- a/read-tree.c
+++ b/read-tree.c
@@ -13,6 +13,7 @@
 #include <sys/time.h>
 #include <signal.h>
 
+static int reset = 0;
 static int merge = 0;
 static int update = 0;
 static int index_only = 0;
@@ -21,6 +22,7 @@ static int trivial_merges_only = 0;
 static int aggressive = 0;
 static int verbose_update = 0;
 static volatile int progress_update = 0;
+static const char *prefix = NULL;
 
 static int head_idx = -1;
 static int merge_size = 0;
@@ -369,7 +371,8 @@ static int unpack_trees(merge_fn_t fn)
 			posns[i] = ((struct tree *) posn->item)->entries;
 			posn = posn->next;
 		}
-		if (unpack_trees_rec(posns, len, "", fn, &indpos))
+		if (unpack_trees_rec(posns, len, prefix ? prefix : "",
+				     fn, &indpos))
 			return -1;
 	}
 
@@ -417,6 +420,10 @@ static void verify_uptodate(struct cache_entry *ce)
 			return;
 		errno = 0;
 	}
+	if (reset) {
+		ce->ce_flags |= htons(CE_UPDATE);
+		return;
+	}
 	if (errno == ENOENT)
 		return;
 	die("Entry '%s' not uptodate. Cannot merge.", ce->name);
@@ -446,6 +453,8 @@ static int merged_entry(struct cache_entry *merge, struct cache_entry *old)
 			invalidate_ce_path(old);
 		}
 	}
+	else
+		invalidate_ce_path(merge);
 	merge->ce_flags &= ~htons(CE_STAGEMASK);
 	add_cache_entry(merge, ADD_CACHE_OK_TO_ADD);
 	return 1;
@@ -677,6 +686,28 @@ static int twoway_merge(struct cache_entry **src)
 		return deleted_entry(oldtree, current);
 }
 
+/*
+ * Bind merge.
+ *
+ * Keep the index entries at stage0, collapse stage1 but make sure
+ * stage0 does not have anything in prefix.
+ */
+static int bind_merge(struct cache_entry **src)
+{
+	struct cache_entry *old = src[0];
+	struct cache_entry *a = src[1];
+
+	if (merge_size != 1)
+		return error("Cannot do a bind merge of %d trees\n",
+			     merge_size);
+	if (!a)
+		return merged_entry(old, NULL);
+	if (old)
+		die("Entry '%s' overlaps.  Cannot bind.", a->name);
+
+	return merged_entry(a, NULL);
+}
+
 /*
  * One-way merge.
  *
@@ -694,9 +725,15 @@ static int oneway_merge(struct cache_entry **src)
 
 	if (!a) {
 		invalidate_ce_path(old);
-		return 0;
+		return deleted_entry(old, NULL);
 	}
 	if (old && same(old, a)) {
+		if (reset) {
+			struct stat st;
+			if (lstat(old->name, &st) ||
+			    ce_match_stat(old, &st, 1))
+				old->ce_flags |= htons(CE_UPDATE);
+		}
 		return keep_entry(old);
 	}
 	return merged_entry(a, NULL);
@@ -758,13 +795,13 @@ static void prime_cache_tree(void)
 
 }
 
-static const char read_tree_usage[] = "git-read-tree (<sha> | -m [--aggressive] [-u | -i] <sha1> [<sha2> [<sha3>]])";
+static const char read_tree_usage[] = "git-read-tree (<sha> | [[-m [--aggressive] | --reset | --prefix=<prefix>] [-u | -i]] <sha1> [<sha2> [<sha3>]])";
 
 static struct cache_file cache_file;
 
 int main(int argc, char **argv)
 {
-	int i, newfd, reset, stage = 0;
+	int i, newfd, stage = 0;
 	unsigned char sha1[20];
 	merge_fn_t fn = NULL;
 
@@ -803,9 +840,24 @@ int main(int argc, char **argv)
 			continue;
 		}
 
+		/* "--prefix=<subdirectory>/" means keep the current index
+		 *  entries and put the entries from the tree under the
+		 * given subdirectory.
+		 */
+		if (!strncmp(arg, "--prefix=", 9)) {
+			if (stage || merge || prefix)
+				usage(read_tree_usage);
+			prefix = arg + 9;
+			merge = 1;
+			stage = 1;
+			if (read_cache_unmerged())
+				die("you need to resolve your current index first");
+			continue;
+		}
+
 		/* This differs from "-m" in that we'll silently ignore unmerged entries */
 		if (!strcmp(arg, "--reset")) {
-			if (stage || merge)
+			if (stage || merge || prefix)
 				usage(read_tree_usage);
 			reset = 1;
 			merge = 1;
@@ -826,7 +878,7 @@ int main(int argc, char **argv)
 
 		/* "-m" stands for "merge", meaning we start in stage 1 */
 		if (!strcmp(arg, "-m")) {
-			if (stage || merge)
+			if (stage || merge || prefix)
 				usage(read_tree_usage);
 			if (read_cache_unmerged())
 				die("you need to resolve your current index first");
@@ -839,8 +891,8 @@ int main(int argc, char **argv)
 		if (1 < index_only + update)
 			usage(read_tree_usage);
 
-		if (get_sha1(arg, sha1) < 0)
-			usage(read_tree_usage);
+		if (get_sha1(arg, sha1))
+			die("Not a valid object name %s", arg);
 		if (list_tree(sha1) < 0)
 			die("failed to unpack tree object %s", arg);
 		stage++;
@@ -848,12 +900,31 @@ int main(int argc, char **argv)
 	if ((update||index_only) && !merge)
 		usage(read_tree_usage);
 
+	if (prefix) {
+		int pfxlen = strlen(prefix);
+		int pos;
+		if (prefix[pfxlen-1] != '/')
+			die("prefix must end with /");
+		if (stage != 2)
+			die("binding merge takes only one tree");
+		pos = cache_name_pos(prefix, pfxlen);
+		if (0 <= pos)
+			die("corrupt index file");
+		pos = -pos-1;
+		if (pos < active_nr &&
+		    !strncmp(active_cache[pos]->name, prefix, pfxlen))
+			die("subdirectory '%s' already exists.", prefix);
+		pos = cache_name_pos(prefix, pfxlen-1);
+		if (0 <= pos)
+			die("file '%.*s' already exists.", pfxlen-1, prefix);
+	}
+
 	if (merge) {
 		if (stage < 2)
 			die("just how do you expect me to merge %d trees?", stage-1);
 		switch (stage - 1) {
 		case 1:
-			fn = oneway_merge;
+			fn = prefix ? bind_merge : oneway_merge;
 			break;
 		case 2:
 			fn = twoway_merge;
@@ -879,8 +950,8 @@ int main(int argc, char **argv)
 	 * valid cache-tree because the index must match exactly
 	 * what came from the tree.
 	 */
-	if (trees->item && (!merge || (stage == 2))) {
-		cache_tree_free(&active_cache_tree);		
+	if (trees && trees->item && (!merge || (stage == 2))) {
+		cache_tree_free(&active_cache_tree);
 		prime_cache_tree();
 	}