git-whatchanged: Add usage string

diff --git a/send-pack.c b/send-pack.c
index 4d015fd6e47e5c8cc518fac1d5601cfa012a46d4..6ce0d9f7884e34c9dc6c90f98bc9f7745c07e12a 100644 (file)
--- a/send-pack.c
+++ b/send-pack.c
@@ -105,36 +105,53 @@ static int pack_objects(int fd, struct ref *refs)
        return 0;
 }
 
+static void unmark_and_free(struct commit_list *list, unsigned int mark)
+{
+       while (list) {
+               struct commit_list *temp = list;
+               temp->item->object.flags &= ~mark;
+               list = temp->next;
+               free(temp);
+       }
+}
+
 static int ref_newer(const unsigned char *new_sha1,
                     const unsigned char *old_sha1)
 {
        struct object *o;
        struct commit *old, *new;
-       struct commit_list *list;
+       struct commit_list *list, *used;
+       int found = 0;
 
        /* Both new and old must be commit-ish and new is descendant of
         * old.  Otherwise we require --force.
         */
-       o = deref_tag(parse_object(old_sha1));
+       o = deref_tag(parse_object(old_sha1), NULL, 0);
        if (!o || o->type != commit_type)
                return 0;
        old = (struct commit *) o;
 
-       o = deref_tag(parse_object(new_sha1));
+       o = deref_tag(parse_object(new_sha1), NULL, 0);
        if (!o || o->type != commit_type)
                return 0;
        new = (struct commit *) o;
 
        if (parse_commit(new) < 0)
                return 0;
-       list = NULL;
+
+       used = list = NULL;
        commit_list_insert(new, &list);
        while (list) {
                new = pop_most_recent_commit(&list, 1);
-               if (new == old)
-                       return 1;
+               commit_list_insert(new, &used);
+               if (new == old) {
+                       found = 1;
+                       break;
+               }
        }
-       return 0;
+       unmark_and_free(list, 1);
+       unmark_and_free(used, 1);
+       return found;
 }
 
 static struct ref *local_refs, **local_tail;
@@ -162,9 +179,10 @@ static int send_pack(int in, int out, int nr_refspec, char **refspec)
 {
        struct ref *ref;
        int new_refs;
+       int ret = 0;
 
        /* No funny business with the matcher */
-       remote_tail = get_remote_heads(in, &remote_refs, 0, NULL);
+       remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
        get_local_heads();
 
        /* match them up */
@@ -173,6 +191,12 @@ static int send_pack(int in, int out, int nr_refspec, char **refspec)
        if (match_refs(local_refs, remote_refs, &remote_tail,
                       nr_refspec, refspec, send_all))
                return -1;
+
+       if (!remote_refs) {
+               fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
+               return 0;
+       }
+
        /*
         * Finally, tell the other end!
         */
@@ -189,7 +213,8 @@ static int send_pack(int in, int out, int nr_refspec, char **refspec)
                /* This part determines what can overwrite what.
                 * The rules are:
                 *
-                * (0) you can always use --force.
+                * (0) you can always use --force or +A:B notation to
+                *     selectively force individual ref pairs.
                 *
                 * (1) if the old thing does not exist, it is OK.
                 *
@@ -201,16 +226,20 @@ static int send_pack(int in, int out, int nr_refspec, char **refspec)
                 *     descendant of old, it is OK.
                 */
 
-               if (!force_update && !is_zero_sha1(ref->old_sha1)) {
+               if (!force_update &&
+                   !is_zero_sha1(ref->old_sha1) &&
+                   !ref->force) {
                        if (!has_sha1_file(ref->old_sha1)) {
                                error("remote '%s' object %s does not "
                                      "exist on local",
                                      ref->name, sha1_to_hex(ref->old_sha1));
+                               ret = -2;
                                continue;
                        }
+
                        /* We assume that local is fsck-clean.  Otherwise
-                        * you _could_ have a old tag which points at
-                        * something you do not have which may or may not
+                        * you _could_ have an old tag which points at
+                        * something you do not have, which may or may not
                         * be a commit.
                         */
                        if (!ref_newer(ref->peer_ref->new_sha1,
@@ -218,12 +247,14 @@ static int send_pack(int in, int out, int nr_refspec, char **refspec)
                                error("remote ref '%s' is not a strict "
                                      "subset of local ref '%s'.", ref->name,
                                      ref->peer_ref->name);
+                               ret = -2;
                                continue;
                        }
                }
                memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
                if (is_zero_sha1(ref->new_sha1)) {
                        error("cannot happen anymore");
+                       ret = -3;
                        continue;
                }
                new_refs++;
@@ -240,7 +271,7 @@ static int send_pack(int in, int out, int nr_refspec, char **refspec)
        if (new_refs)
                pack_objects(out, remote_refs);
        close(out);
-       return 0;
+       return ret;
 }
 
 
@@ -252,6 +283,7 @@ int main(int argc, char **argv)
        int fd[2], ret;
        pid_t pid;
 
+       setup_git_directory();
        argv++;
        for (i = 1; i < argc; i++, argv++) {
                char *arg = *argv;