Add test-dump-cache-tree

This was useful in diagnosing the corrupt index.aux format
problem.  But do not bother building or installing it by
default.

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 32 insertions, 0 deletions

diff --git a/dump-cache-tree.c b/dump-cache-tree.c
new file mode 100644
index 0000000000..80f8683f39
--- /dev/null
+++ b/dump-cache-tree.c
@@ -0,0 +1,32 @@
+#include "cache.h"
+#include "tree.h"
+#include "cache-tree.h"
+
+static unsigned char active_cache_sha1[20];
+static struct cache_tree *active_cache_tree;
+
+static void dump_cache_tree(struct cache_tree *it, const char *pfx)
+{
+	int i;
+	if (it->entry_count < 0)
+		printf("%-40s %s\n", "invalid", pfx);
+	else
+		printf("%s %s (%d entries)\n",
+		       sha1_to_hex(it->sha1),
+		       pfx, it->entry_count);
+	for (i = 0; i < it->subtree_nr; i++) {
+		char path[PATH_MAX];
+		struct cache_tree_sub *down = it->down[i];
+		sprintf(path, "%s%.*s/", pfx, down->namelen, down->name);
+		dump_cache_tree(down->cache_tree, path);
+	}
+}
+
+int main(int ac, char **av)
+{
+	if (read_cache_1(active_cache_sha1) < 0)
+		die("unable to read index file");
+	active_cache_tree = read_cache_tree(active_cache_sha1);
+	dump_cache_tree(active_cache_tree, "");
+	return 0;
+}