grep: fix "--" rev/pathspec disambiguation

diff --git a/builtin/grep.c b/builtin/grep.c
index 2c727ef499c0fa7b44c0cf1890cc44427dc8921f..e83b33bdaa784320211fe8f1e17f2cbdccfe7f25 100644 (file)
--- a/builtin/grep.c
+++ b/builtin/grep.c
@@ -1149,26 +1149,62 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
 
        compile_grep_patterns(&opt);
 
-       /* Check revs and then paths */
+       /*
+        * We have to find "--" in a separate pass, because its presence
+        * influences how we will parse arguments that come before it.
+        */
+       for (i = 0; i < argc; i++) {
+               if (!strcmp(argv[i], "--")) {
+                       seen_dashdash = 1;
+                       break;
+               }
+       }
+
+       /*
+        * Resolve any rev arguments. If we have a dashdash, then everything up
+        * to it must resolve as a rev. If not, then we stop at the first
+        * non-rev and assume everything else is a path.
+        */
        for (i = 0; i < argc; i++) {
                const char *arg = argv[i];
                unsigned char sha1[20];
                struct object_context oc;
-               /* Is it a rev? */
-               if (!get_sha1_with_context(arg, 0, sha1, &oc)) {
-                       struct object *object = parse_object_or_die(sha1, arg);
-                       if (!seen_dashdash)
-                               verify_non_filename(prefix, arg);
-                       add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
-                       continue;
-               }
+               struct object *object;
+
                if (!strcmp(arg, "--")) {
                        i++;
-                       seen_dashdash = 1;
+                       break;
                }
-               break;
+
+               if (get_sha1_with_context(arg, 0, sha1, &oc)) {
+                       if (seen_dashdash)
+                               die(_("unable to resolve revision: %s"), arg);
+                       break;
+               }
+
+               object = parse_object_or_die(sha1, arg);
+               if (!seen_dashdash)
+                       verify_non_filename(prefix, arg);
+               add_object_array_with_path(object, arg, &list, oc.mode, oc.path);
+       }
+
+       /*
+        * Anything left over is presumed to be a path. But in the non-dashdash
+        * "do what I mean" case, we verify and complain when that isn't true.
+        */
+       if (!seen_dashdash) {
+               int j;
+               for (j = i; j < argc; j++)
+                       verify_filename(prefix, argv[j], j == i);
        }
 
+       parse_pathspec(&pathspec, 0,
+                      PATHSPEC_PREFER_CWD |
+                      (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
+                      prefix, argv + i);
+       pathspec.max_depth = opt.max_depth;
+       pathspec.recursive = 1;
+
 #ifndef NO_PTHREADS
        if (list.nr || cached || show_in_pager)
                num_threads = 0;
@@ -1190,20 +1226,6 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
        }
 #endif
 
-       /* The rest are paths */
-       if (!seen_dashdash) {
-               int j;
-               for (j = i; j < argc; j++)
-                       verify_filename(prefix, argv[j], j == i);
-       }
-
-       parse_pathspec(&pathspec, 0,
-                      PATHSPEC_PREFER_CWD |
-                      (opt.max_depth != -1 ? PATHSPEC_MAXDEPTH_VALID : 0),
-                      prefix, argv + i);
-       pathspec.max_depth = opt.max_depth;
-       pathspec.recursive = 1;
-
        if (recurse_submodules) {
                gitmodules_config();
                compile_submodule_options(&opt, &pathspec, cached, untracked,