1 files changed, 183 insertions, 62 deletions

diff --git a/cache-tree.c b/cache-tree.c
index 077f034369..28ed6574a2 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "tree.h"
+#include "tree-walk.h"
 #include "cache-tree.h"
 
 #ifndef DEBUG
@@ -21,8 +22,10 @@ void cache_tree_free(struct cache_tree **it_p)
 	if (!it)
 		return;
 	for (i = 0; i < it->subtree_nr; i++)
-		if (it->down[i])
+		if (it->down[i]) {
 			cache_tree_free(&it->down[i]->cache_tree);
+			free(it->down[i]);
+		}
 	free(it->down);
 	free(it);
 	*it_p = NULL;
@@ -147,21 +150,28 @@ void cache_tree_invalidate_path(struct cache_tree *it, const char *path)
 }
 
 static int verify_cache(struct cache_entry **cache,
-			int entries)
+			int entries, int flags)
 {
 	int i, funny;
+	int silent = flags & WRITE_TREE_SILENT;
 
 	/* Verify that the tree is merged */
 	funny = 0;
 	for (i = 0; i < entries; i++) {
 		struct cache_entry *ce = cache[i];
 		if (ce_stage(ce)) {
+			if (silent)
+				return -1;
 			if (10 < ++funny) {
 				fprintf(stderr, "...\n");
 				break;
 			}
-			fprintf(stderr, "%s: unmerged (%s)\n",
-				ce->name, sha1_to_hex(ce->sha1));
+			if (ce_stage(ce))
+				fprintf(stderr, "%s: unmerged (%s)\n",
+					ce->name, sha1_to_hex(ce->sha1));
+			else
+				fprintf(stderr, "%s: not added yet\n",
+					ce->name);
 		}
 	}
 	if (funny)
@@ -232,11 +242,11 @@ static int update_one(struct cache_tree *it,
 		      int entries,
 		      const char *base,
 		      int baselen,
-		      int missing_ok,
-		      int dryrun)
+		      int flags)
 {
-	unsigned long size, offset;
-	char *buffer;
+	struct strbuf buffer;
+	int missing_ok = flags & WRITE_TREE_MISSING_OK;
+	int dryrun = flags & WRITE_TREE_DRY_RUN;
 	int i;
 
 	if (0 <= it->entry_count && has_sha1_file(it->sha1))
@@ -280,8 +290,7 @@ static int update_one(struct cache_tree *it,
 				    cache + i, entries - i,
 				    path,
 				    baselen + sublen + 1,
-				    missing_ok,
-				    dryrun);
+				    flags);
 		if (subcnt < 0)
 			return subcnt;
 		i += subcnt - 1;
@@ -293,9 +302,7 @@ static int update_one(struct cache_tree *it,
 	/*
 	 * Then write out the tree object for this level.
 	 */
-	size = 8192;
-	buffer = xmalloc(size);
-	offset = 0;
+	strbuf_init(&buffer, 8192);
 
 	for (i = 0; i < entries; i++) {
 		struct cache_entry *ce = cache[i];
@@ -323,24 +330,21 @@ static int update_one(struct cache_tree *it,
 		}
 		else {
 			sha1 = ce->sha1;
-			mode = ntohl(ce->ce_mode);
+			mode = ce->ce_mode;
 			entlen = pathlen - baselen;
 		}
-		if (mode != S_IFGITLINK && !missing_ok && !has_sha1_file(sha1))
-			return error("invalid object %s", sha1_to_hex(sha1));
+		if (mode != S_IFGITLINK && !missing_ok && !has_sha1_file(sha1)) {
+			strbuf_release(&buffer);
+			return error("invalid object %06o %s for '%.*s'",
+				mode, sha1_to_hex(sha1), entlen+baselen, path);
+		}
 
-		if (!ce->ce_mode)
-			continue; /* entry being removed */
+		if (ce->ce_flags & (CE_REMOVE | CE_INTENT_TO_ADD))
+			continue; /* entry being removed or placeholder */
 
-		if (size < offset + entlen + 100) {
-			size = alloc_nr(offset + entlen + 100);
-			buffer = xrealloc(buffer, size);
-		}
-		offset += sprintf(buffer + offset,
-				  "%o %.*s", mode, entlen, path + baselen);
-		buffer[offset++] = 0;
-		hashcpy((unsigned char*)buffer + offset, sha1);
-		offset += 20;
+		strbuf_grow(&buffer, entlen + 100);
+		strbuf_addf(&buffer, "%o %.*s%c", mode, entlen, path + baselen, '\0');
+		strbuf_add(&buffer, sha1, 20);
 
 #if DEBUG
 		fprintf(stderr, "cache-tree update-one %o %.*s\n",
@@ -349,10 +353,13 @@ static int update_one(struct cache_tree *it,
 	}
 
 	if (dryrun)
-		hash_sha1_file(buffer, offset, tree_type, it->sha1);
-	else
-		write_sha1_file(buffer, offset, tree_type, it->sha1);
-	free(buffer);
+		hash_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1);
+	else if (write_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1)) {
+		strbuf_release(&buffer);
+		return -1;
+	}
+
+	strbuf_release(&buffer);
 	it->entry_count = i;
 #if DEBUG
 	fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n",
@@ -365,25 +372,20 @@ static int update_one(struct cache_tree *it,
 int cache_tree_update(struct cache_tree *it,
 		      struct cache_entry **cache,
 		      int entries,
-		      int missing_ok,
-		      int dryrun)
+		      int flags)
 {
 	int i;
-	i = verify_cache(cache, entries);
+	i = verify_cache(cache, entries, flags);
 	if (i)
 		return i;
-	i = update_one(it, cache, entries, "", 0, missing_ok, dryrun);
+	i = update_one(it, cache, entries, "", 0, flags);
 	if (i < 0)
 		return i;
 	return 0;
 }
 
-static void *write_one(struct cache_tree *it,
-		       char *path,
-		       int pathlen,
-		       char *buffer,
-		       unsigned long *size,
-		       unsigned long *offset)
+static void write_one(struct strbuf *buffer, struct cache_tree *it,
+                      const char *path, int pathlen)
 {
 	int i;
 
@@ -393,13 +395,9 @@ static void *write_one(struct cache_tree *it,
 	 * tree-sha1 (missing if invalid)
 	 * subtree_nr "cache-tree" entries for subtrees.
 	 */
-	if (*size < *offset + pathlen + 100) {
-		*size = alloc_nr(*offset + pathlen + 100);
-		buffer = xrealloc(buffer, *size);
-	}
-	*offset += sprintf(buffer + *offset, "%.*s%c%d %d\n",
-			   pathlen, path, 0,
-			   it->entry_count, it->subtree_nr);
+	strbuf_grow(buffer, pathlen + 100);
+	strbuf_add(buffer, path, pathlen);
+	strbuf_addf(buffer, "%c%d %d\n", 0, it->entry_count, it->subtree_nr);
 
 #if DEBUG
 	if (0 <= it->entry_count)
@@ -412,8 +410,7 @@ static void *write_one(struct cache_tree *it,
 #endif
 
 	if (0 <= it->entry_count) {
-		hashcpy((unsigned char*)buffer + *offset, it->sha1);
-		*offset += 20;
+		strbuf_add(buffer, it->sha1, 20);
 	}
 	for (i = 0; i < it->subtree_nr; i++) {
 		struct cache_tree_sub *down = it->down[i];
@@ -423,21 +420,13 @@ static void *write_one(struct cache_tree *it,
 					     prev->name, prev->namelen) <= 0)
 				die("fatal - unsorted cache subtree");
 		}
-		buffer = write_one(down->cache_tree, down->name, down->namelen,
-				   buffer, size, offset);
+		write_one(buffer, down->cache_tree, down->name, down->namelen);
 	}
-	return buffer;
 }
 
-void *cache_tree_write(struct cache_tree *root, unsigned long *size_p)
+void cache_tree_write(struct strbuf *sb, struct cache_tree *root)
 {
-	char path[PATH_MAX];
-	unsigned long size = 8192;
-	char *buffer = xmalloc(size);
-
-	*size_p = 0;
-	path[0] = 0;
-	return write_one(root, path, 0, buffer, &size, size_p);
+	write_one(sb, root, "", 0);
 }
 
 static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
@@ -530,8 +519,10 @@ struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
 	return read_one(&buffer, &size);
 }
 
-struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
+static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
 {
+	if (!it)
+		return NULL;
 	while (*path) {
 		const char *slash;
 		struct cache_tree_sub *sub;
@@ -555,3 +546,133 @@ struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
 	}
 	return it;
 }
+
+int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
+{
+	int entries, was_valid, newfd;
+	struct lock_file *lock_file;
+
+	/*
+	 * We can't free this memory, it becomes part of a linked list
+	 * parsed atexit()
+	 */
+	lock_file = xcalloc(1, sizeof(struct lock_file));
+
+	newfd = hold_locked_index(lock_file, 1);
+
+	entries = read_cache();
+	if (entries < 0)
+		return WRITE_TREE_UNREADABLE_INDEX;
+	if (flags & WRITE_TREE_IGNORE_CACHE_TREE)
+		cache_tree_free(&(active_cache_tree));
+
+	if (!active_cache_tree)
+		active_cache_tree = cache_tree();
+
+	was_valid = cache_tree_fully_valid(active_cache_tree);
+	if (!was_valid) {
+		if (cache_tree_update(active_cache_tree,
+				      active_cache, active_nr,
+				      flags) < 0)
+			return WRITE_TREE_UNMERGED_INDEX;
+		if (0 <= newfd) {
+			if (!write_cache(newfd, active_cache, active_nr) &&
+			    !commit_lock_file(lock_file))
+				newfd = -1;
+		}
+		/* Not being able to write is fine -- we are only interested
+		 * in updating the cache-tree part, and if the next caller
+		 * ends up using the old index with unupdated cache-tree part
+		 * it misses the work we did here, but that is just a
+		 * performance penalty and not a big deal.
+		 */
+	}
+
+	if (prefix) {
+		struct cache_tree *subtree =
+			cache_tree_find(active_cache_tree, prefix);
+		if (!subtree)
+			return WRITE_TREE_PREFIX_ERROR;
+		hashcpy(sha1, subtree->sha1);
+	}
+	else
+		hashcpy(sha1, active_cache_tree->sha1);
+
+	if (0 <= newfd)
+		rollback_lock_file(lock_file);
+
+	return 0;
+}
+
+static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
+{
+	struct tree_desc desc;
+	struct name_entry entry;
+	int cnt;
+
+	hashcpy(it->sha1, tree->object.sha1);
+	init_tree_desc(&desc, tree->buffer, tree->size);
+	cnt = 0;
+	while (tree_entry(&desc, &entry)) {
+		if (!S_ISDIR(entry.mode))
+			cnt++;
+		else {
+			struct cache_tree_sub *sub;
+			struct tree *subtree = lookup_tree(entry.sha1);
+			if (!subtree->object.parsed)
+				parse_tree(subtree);
+			sub = cache_tree_sub(it, entry.path);
+			sub->cache_tree = cache_tree();
+			prime_cache_tree_rec(sub->cache_tree, subtree);
+			cnt += sub->cache_tree->entry_count;
+		}
+	}
+	it->entry_count = cnt;
+}
+
+void prime_cache_tree(struct cache_tree **it, struct tree *tree)
+{
+	cache_tree_free(it);
+	*it = cache_tree();
+	prime_cache_tree_rec(*it, tree);
+}
+
+/*
+ * find the cache_tree that corresponds to the current level without
+ * exploding the full path into textual form.  The root of the
+ * cache tree is given as "root", and our current level is "info".
+ * (1) When at root level, info->prev is NULL, so it is "root" itself.
+ * (2) Otherwise, find the cache_tree that corresponds to one level
+ *     above us, and find ourselves in there.
+ */
+static struct cache_tree *find_cache_tree_from_traversal(struct cache_tree *root,
+							 struct traverse_info *info)
+{
+	struct cache_tree *our_parent;
+
+	if (!info->prev)
+		return root;
+	our_parent = find_cache_tree_from_traversal(root, info->prev);
+	return cache_tree_find(our_parent, info->name.path);
+}
+
+int cache_tree_matches_traversal(struct cache_tree *root,
+				 struct name_entry *ent,
+				 struct traverse_info *info)
+{
+	struct cache_tree *it;
+
+	it = find_cache_tree_from_traversal(root, info);
+	it = cache_tree_find(it, ent->path);
+	if (it && it->entry_count > 0 && !hashcmp(ent->sha1, it->sha1))
+		return it->entry_count;
+	return 0;
+}
+
+int update_main_cache_tree(int flags)
+{
+	if (!the_index.cache_tree)
+		the_index.cache_tree = cache_tree();
+	return cache_tree_update(the_index.cache_tree,
+				 the_index.cache, the_index.cache_nr, flags);
+}