rev-list --objects-edge

This new flag is similar to --objects, but causes rev-list to
show list of "uninteresting" commits that appear on the edge
commit prefixed with '-'.

Downstream pack-objects will be changed to take these as hints
to use the trees and blobs contained with them as base objects
of resulting pack, producing an incomplete (not self-contained)
pack.

Such a pack cannot be used in .git/objects/pack (it is prevented
by git-index-pack erroring out if it is fed to git-fetch-pack -k
or git-clone-pack), but would be useful when transferring only
small changes to huge blobs.

Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/rev-list.c b/rev-list.c
index f2d1105..373549e 100644 (file)
--- a/rev-list.c
+++ b/rev-list.c
@@ -30,7 +30,7 @@ static const char rev_list_usage[] =
 "    --date-order\n"
 "  formatting output:\n"
 "    --parents\n"
-"    --objects\n"
+"    --objects | --objects-edge\n"
 "    --unpacked\n"
 "    --header | --pretty\n"
 "    --abbrev=nr | --no-abbrev\n"
@@ -44,6 +44,7 @@ static int bisect_list = 0;
 static int tag_objects = 0;
 static int tree_objects = 0;
 static int blob_objects = 0;
+static int edge_hint = 0;
 static int verbose_header = 0;
 static int abbrev = DEFAULT_ABBREV;
 static int show_parents = 0;
@@ -430,16 +431,30 @@ static struct commit_list *find_bisection(struct commit_list *list)
        return best;
 }
 
+static void mark_edge_parents_uninteresting(struct commit *commit)
+{
+       struct commit_list *parents;
+
+       for (parents = commit->parents; parents; parents = parents->next) {
+               struct commit *parent = parents->item;
+               if (!(parent->object.flags & UNINTERESTING))
+                       continue;
+               mark_tree_uninteresting(parent->tree);
+               if (edge_hint)
+                       printf("-%s\n", sha1_to_hex(parent->object.sha1));
+       }
+}
+
 static void mark_edges_uninteresting(struct commit_list *list)
 {
        for ( ; list; list = list->next) {
-               struct commit_list *parents = list->item->parents;
+               struct commit *commit = list->item;
 
-               for ( ; parents; parents = parents->next) {
-                       struct commit *commit = parents->item;
-                       if (commit->object.flags & UNINTERESTING)
-                               mark_tree_uninteresting(commit->tree);
+               if (commit->object.flags & UNINTERESTING) {
+                       mark_tree_uninteresting(commit->tree);
+                       continue;
                }
+               mark_edge_parents_uninteresting(commit);
        }
 }
 
@@ -843,6 +858,13 @@ int main(int argc, const char **argv)
                        blob_objects = 1;
                        continue;
                }
+               if (!strcmp(arg, "--objects-edge")) {
+                       tag_objects = 1;
+                       tree_objects = 1;
+                       blob_objects = 1;
+                       edge_hint = 1;
+                       continue;
+               }
                if (!strcmp(arg, "--unpacked")) {
                        unpacked = 1;
                        limited = 1;

diff --git a/rev-parse.c b/rev-parse.c
index a5fb93c..610eacb 100644 (file)
--- a/rev-parse.c
+++ b/rev-parse.c
@@ -43,6 +43,7 @@ static int is_rev_argument(const char *arg)
                "--min-age=",
                "--no-merges",
                "--objects",
+               "--objects-edge",
                "--parents",
                "--pretty",
                "--show-breaks",