git: add --no-replace-objects option to disable replacing

diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index ca198250c3082be82cdca09954198d6617b95bf8..b0a4029c94d1bdb1c673fe604cdbfec93df875aa 100644 (file)
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -23,8 +23,10 @@ static const char *fast_export_usage[] = {
 };
 
 static int progress;
-static enum { VERBATIM, WARN, STRIP, ABORT } signed_tag_mode = ABORT;
+static enum { ABORT, VERBATIM, WARN, STRIP } signed_tag_mode = ABORT;
+static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ABORT;
 static int fake_missing_tagger;
+static int no_data;
 
 static int parse_opt_signed_tag_mode(const struct option *opt,
                                     const char *arg, int unset)
@@ -42,6 +44,20 @@ static int parse_opt_signed_tag_mode(const struct option *opt,
        return 0;
 }
 
+static int parse_opt_tag_of_filtered_mode(const struct option *opt,
+                                         const char *arg, int unset)
+{
+       if (unset || !strcmp(arg, "abort"))
+               tag_of_filtered_mode = ABORT;
+       else if (!strcmp(arg, "drop"))
+               tag_of_filtered_mode = DROP;
+       else if (!strcmp(arg, "rewrite"))
+               tag_of_filtered_mode = REWRITE;
+       else
+               return error("Unknown tag-of-filtered mode: %s", arg);
+       return 0;
+}
+
 static struct decoration idnums;
 static uint32_t last_idnum;
 
@@ -101,6 +117,9 @@ static void handle_object(const unsigned char *sha1)
        char *buf;
        struct object *object;
 
+       if (no_data)
+               return;
+
        if (is_null_sha1(sha1))
                return;
 
@@ -158,7 +177,7 @@ static void show_filemodify(struct diff_queue_struct *q,
                         * Links refer to objects in another repositories;
                         * output the SHA-1 verbatim.
                         */
-                       if (S_ISGITLINK(spec->mode))
+                       if (no_data || S_ISGITLINK(spec->mode))
                                printf("M %06o %s %s\n", spec->mode,
                                       sha1_to_hex(spec->sha1), spec->path);
                        else {
@@ -289,6 +308,23 @@ static void handle_tag(const char *name, struct tag *tag)
        char *buf;
        const char *tagger, *tagger_end, *message;
        size_t message_size = 0;
+       struct object *tagged;
+       int tagged_mark;
+       struct commit *p;
+
+       /* Trees have no identifer in fast-export output, thus we have no way
+        * to output tags of trees, tags of tags of trees, etc.  Simply omit
+        * such tags.
+        */
+       tagged = tag->tagged;
+       while (tagged->type == OBJ_TAG) {
+               tagged = ((struct tag *)tagged)->tagged;
+       }
+       if (tagged->type == OBJ_TREE) {
+               warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
+                       sha1_to_hex(tag->object.sha1));
+               return;
+       }
 
        buf = read_sha1_file(tag->object.sha1, &type, &size);
        if (!buf)
@@ -333,10 +369,45 @@ static void handle_tag(const char *name, struct tag *tag)
                        }
        }
 
+       /* handle tag->tagged having been filtered out due to paths specified */
+       tagged = tag->tagged;
+       tagged_mark = get_object_mark(tagged);
+       if (!tagged_mark) {
+               switch(tag_of_filtered_mode) {
+               case ABORT:
+                       die ("Tag %s tags unexported object; use "
+                            "--tag-of-filtered-object=<mode> to handle it.",
+                            sha1_to_hex(tag->object.sha1));
+               case DROP:
+                       /* Ignore this tag altogether */
+                       return;
+               case REWRITE:
+                       if (tagged->type != OBJ_COMMIT) {
+                               die ("Tag %s tags unexported %s!",
+                                    sha1_to_hex(tag->object.sha1),
+                                    typename(tagged->type));
+                       }
+                       p = (struct commit *)tagged;
+                       for (;;) {
+                               if (p->parents && p->parents->next)
+                                       break;
+                               if (p->object.flags & UNINTERESTING)
+                                       break;
+                               if (!(p->object.flags & TREESAME))
+                                       break;
+                               if (!p->parents)
+                                       die ("Can't find replacement commit for tag %s\n",
+                                            sha1_to_hex(tag->object.sha1));
+                               p = p->parents->item;
+                       }
+                       tagged_mark = get_object_mark(&p->object);
+               }
+       }
+
        if (!prefixcmp(name, "refs/tags/"))
                name += 10;
        printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
-              name, get_object_mark(tag->tagged),
+              name, tagged_mark,
               (int)(tagger_end - tagger), tagger,
               tagger == tagger_end ? "" : "\n",
               (int)message_size, (int)message_size, message ? message : "");
@@ -504,12 +575,18 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
                OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, "mode",
                             "select handling of signed tags",
                             parse_opt_signed_tag_mode),
+               OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, "mode",
+                            "select handling of tags that tag filtered objects",
+                            parse_opt_tag_of_filtered_mode),
                OPT_STRING(0, "export-marks", &export_filename, "FILE",
                             "Dump marks to this file"),
                OPT_STRING(0, "import-marks", &import_filename, "FILE",
                             "Import marks from this file"),
                OPT_BOOLEAN(0, "fake-missing-tagger", &fake_missing_tagger,
                             "Fake a tagger when tags lack one"),
+               { OPTION_NEGBIT, 0, "data", &no_data, NULL,
+                       "Skip output of blob data",
+                       PARSE_OPT_NOARG | PARSE_OPT_NEGHELP, NULL, 1 },
                OPT_END()
        };
 
@@ -520,6 +597,9 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
        git_config(git_default_config, NULL);
 
        init_revisions(&revs, prefix);
+       revs.topo_order = 1;
+       revs.show_source = 1;
+       revs.rewrite_parents = 1;
        argc = setup_revisions(argc, argv, &revs, NULL);
        argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
        if (argc > 1)
@@ -530,18 +610,13 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
 
        get_tags_and_duplicates(&revs.pending, &extra_refs);
 
-       revs.topo_order = 1;
        if (prepare_revision_walk(&revs))
                die("revision walk setup failed");
        revs.diffopt.format_callback = show_filemodify;
        DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
        while ((commit = get_revision(&revs))) {
                if (has_unshown_parent(commit)) {
-                       struct commit_list *parent = commit->parents;
                        add_object_array(&commit->object, NULL, &commits);
-                       for (; parent; parent = parent->next)
-                               if (!parent->item->util)
-                                       parent->item->util = commit->util;
                }
                else {
                        handle_commit(commit, &revs);