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diff --git a/builtin/verify-pack.c b/builtin/verify-pack.c
--- /dev/null
+++ b/builtin/verify-pack.c
@@ -0,0 +1,166 @@
+#include "builtin.h"
+#include "cache.h"
+#include "pack.h"
+#include "pack-revindex.h"
+#include "parse-options.h"
+
+#define MAX_CHAIN 50
+
+#define VERIFY_PACK_VERBOSE 01
+#define VERIFY_PACK_STAT_ONLY 02
+
+static void show_pack_info(struct packed_git *p, unsigned int flags)
+{
+ uint32_t nr_objects, i;
+ int cnt;
+ int stat_only = flags & VERIFY_PACK_STAT_ONLY;
+ unsigned long chain_histogram[MAX_CHAIN+1], baseobjects;
+
+ nr_objects = p->num_objects;
+ memset(chain_histogram, 0, sizeof(chain_histogram));
+ baseobjects = 0;
+
+ for (i = 0; i < nr_objects; i++) {
+ const unsigned char *sha1;
+ unsigned char base_sha1[20];
+ const char *type;
+ unsigned long size;
+ unsigned long store_size;
+ off_t offset;
+ unsigned int delta_chain_length;
+
+ sha1 = nth_packed_object_sha1(p, i);
+ if (!sha1)
+ die("internal error pack-check nth-packed-object");
+ offset = nth_packed_object_offset(p, i);
+ type = packed_object_info_detail(p, offset, &size, &store_size,
+ &delta_chain_length,
+ base_sha1);
+ if (!stat_only)
+ printf("%s ", sha1_to_hex(sha1));
+ if (!delta_chain_length) {
+ if (!stat_only)
+ printf("%-6s %lu %lu %"PRIuMAX"\n",
+ type, size, store_size, (uintmax_t)offset);
+ baseobjects++;
+ }
+ else {
+ if (!stat_only)
+ printf("%-6s %lu %lu %"PRIuMAX" %u %s\n",
+ type, size, store_size, (uintmax_t)offset,
+ delta_chain_length, sha1_to_hex(base_sha1));
+ if (delta_chain_length <= MAX_CHAIN)
+ chain_histogram[delta_chain_length]++;
+ else
+ chain_histogram[0]++;
+ }
+ }
+
+ if (baseobjects)
+ printf("non delta: %lu object%s\n",
+ baseobjects, baseobjects > 1 ? "s" : "");
+
+ for (cnt = 1; cnt <= MAX_CHAIN; cnt++) {
+ if (!chain_histogram[cnt])
+ continue;
+ printf("chain length = %d: %lu object%s\n", cnt,
+ chain_histogram[cnt],
+ chain_histogram[cnt] > 1 ? "s" : "");
+ }
+ if (chain_histogram[0])
+ printf("chain length > %d: %lu object%s\n", MAX_CHAIN,
+ chain_histogram[0],
+ chain_histogram[0] > 1 ? "s" : "");
+}
+
+static int verify_one_pack(const char *path, unsigned int flags)
+{
+ char arg[PATH_MAX];
+ int len;
+ int verbose = flags & VERIFY_PACK_VERBOSE;
+ int stat_only = flags & VERIFY_PACK_STAT_ONLY;
+ struct packed_git *pack;
+ int err;
+
+ len = strlcpy(arg, path, PATH_MAX);
+ if (len >= PATH_MAX)
+ return error("name too long: %s", path);
+
+ /*
+ * In addition to "foo.idx" we accept "foo.pack" and "foo";
+ * normalize these forms to "foo.idx" for add_packed_git().
+ */
+ if (has_extension(arg, ".pack")) {
+ strcpy(arg + len - 5, ".idx");
+ len--;
+ } else if (!has_extension(arg, ".idx")) {
+ if (len + 4 >= PATH_MAX)
+ return error("name too long: %s.idx", arg);
+ strcpy(arg + len, ".idx");
+ len += 4;
+ }
+
+ /*
+ * add_packed_git() uses our buffer (containing "foo.idx") to
+ * build the pack filename ("foo.pack"). Make sure it fits.
+ */
+ if (len + 1 >= PATH_MAX) {
+ arg[len - 4] = '\0';
+ return error("name too long: %s.pack", arg);
+ }
+
+ pack = add_packed_git(arg, len, 1);
+ if (!pack)
+ return error("packfile %s not found.", arg);
+
+ install_packed_git(pack);
+
+ if (!stat_only)
+ err = verify_pack(pack);
+ else
+ err = open_pack_index(pack);
+
+ if (verbose || stat_only) {
+ if (err)
+ printf("%s: bad\n", pack->pack_name);
+ else {
+ show_pack_info(pack, flags);
+ if (!stat_only)
+ printf("%s: ok\n", pack->pack_name);
+ }
+ }
+
+ return err;
+}
+
+static const char * const verify_pack_usage[] = {
+ "git verify-pack [-v|--verbose] [-s|--stat-only] <pack>...",
+ NULL
+};
+
+int cmd_verify_pack(int argc, const char **argv, const char *prefix)
+{
+ int err = 0;
+ unsigned int flags = 0;
+ int i;
+ const struct option verify_pack_options[] = {
+ OPT_BIT('v', "verbose", &flags, "verbose",
+ VERIFY_PACK_VERBOSE),
+ OPT_BIT('s', "stat-only", &flags, "show statistics only",
+ VERIFY_PACK_STAT_ONLY),
+ OPT_END()
+ };
+
+ git_config(git_default_config, NULL);
+ argc = parse_options(argc, argv, prefix, verify_pack_options,
+ verify_pack_usage, 0);
+ if (argc < 1)
+ usage_with_options(verify_pack_usage, verify_pack_options);
+ for (i = 0; i < argc; i++) {
+ if (verify_one_pack(argv[i], flags))
+ err = 1;
+ discard_revindex();
+ }
+
+ return err;
+}