Merge branch 'sb/repack-in-c'

Rewrite "git repack" in C.

* sb/repack-in-c:
  repack: improve warnings about failure of renaming and removing files
  repack: retain the return value of pack-objects
  repack: rewrite the shell script in C

git.c

@@ -419,6 +419,7 @@ static void handle_internal_command(int argc, const char **argv)
 		{ "remote", cmd_remote, RUN_SETUP },
 		{ "remote-ext", cmd_remote_ext },
 		{ "remote-fd", cmd_remote_fd },
+		{ "repack", cmd_repack, RUN_SETUP },
 		{ "replace", cmd_replace, RUN_SETUP },
 		{ "repo-config", cmd_repo_config, RUN_SETUP_GENTLY },
 		{ "rerere", cmd_rerere, RUN_SETUP },