main: Support using repo from current directory

$ cd repo
$ ostree ls foo /
...

Can be a lot more convenient than typing --repo=repo a lot.

src/ostree/ot-main.c

@@ -115,9 +115,6 @@ ostree_run (int    argc,
   else if (g_file_test (host_repo_path, G_FILE_TEST_EXISTS))
     repo = host_repo_path;
 
-  if (repo)
-    repo_file = g_file_new_for_path (repo);
-
   if (!have_repo_arg)
     {
       arg_off = 2;
@@ -147,12 +144,23 @@ ostree_run (int    argc,
   g_set_prgname (g_strdup_printf ("ostree %s", cmd));
 
   if (repo == NULL && !(command->flags & OSTREE_BUILTIN_FLAG_NO_REPO))
+    {
+      if (g_file_test ("objects", G_FILE_TEST_IS_DIR)
+          && g_file_test ("config", G_FILE_TEST_IS_REGULAR))
+        {
+          repo = ".";
+        }
+      else
         {
           g_set_error_literal (&error, G_IO_ERROR, G_IO_ERROR_FAILED,
                                "Command requires a --repo argument");
           ostree_usage (argv, commands, TRUE);
           goto out;
         }
+    }
+
+  if (repo)
+    repo_file = g_file_new_for_path (repo);
   
   ostree_prep_builtin_argv (cmd, argc-arg_off, argv+arg_off, &cmd_argc, &cmd_argv);
 

tests/test-basic.sh

@@ -19,7 +19,7 @@
 
 set -e
 
-echo "1..33"
+echo "1..34"
 
 . $(dirname $0)/libtest.sh
 
@@ -34,6 +34,9 @@ $OSTREE rev-parse 'test2^'
 $OSTREE rev-parse 'test2^^' 2>/dev/null && (echo 1>&2 "rev-parse test2^^ unexpectedly succeeded!"; exit 1)
 echo "ok rev-parse"
 
+(cd repo && ostree rev-parse test2)
+echo "ok repo-in-cwd"
+
 $OSTREE refs > reflist
 assert_file_has_content reflist '^test2$'
 rm reflist