#include "cache.h"
+#include "commit.h"
+#include "tag.h"
+#include "refs.h"
#include "pkt-line.h"
-static const char send_pack_usage[] = "git-send-pack [--exec=other] destination [heads]*";
+static const char send_pack_usage[] =
+"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
+" --all and explicit <head> specification are mutually exclusive.";
static const char *exec = "git-receive-pack";
+static int send_all = 0;
+static int force_update = 0;
-struct ref {
- struct ref *next;
- unsigned char old_sha1[20];
- unsigned char new_sha1[20];
- char name[0];
-};
+static int is_zero_sha1(const unsigned char *sha1)
+{
+ int i;
+
+ for (i = 0; i < 20; i++) {
+ if (*sha1++)
+ return 0;
+ }
+ return 1;
+}
static void exec_pack_objects(void)
{
char *buf = malloc(100);
if (i > 900)
die("git-rev-list environment overflow");
- args[i++] = buf;
- snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
- buf += 50;
- args[i++] = buf;
- snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
+ if (!is_zero_sha1(refs->old_sha1) &&
+ has_sha1_file(refs->old_sha1)) {
+ args[i++] = buf;
+ snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
+ buf += 50;
+ }
+ if (!is_zero_sha1(refs->new_sha1)) {
+ args[i++] = buf;
+ snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
+ }
refs = refs->next;
}
args[i] = NULL;
return 0;
}
-static int read_ref(const char *ref, unsigned char *sha1)
+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)
{
- int fd, ret;
- char buffer[60];
+ struct object *o;
+ struct commit *old, *new;
+ struct commit_list *list, *used;
+ int found = 0;
- fd = open(git_path("%s", ref), O_RDONLY);
- if (fd < 0)
- return -1;
- ret = -1;
- if (read(fd, buffer, sizeof(buffer)) >= 40)
- ret = get_sha1_hex(buffer, sha1);
- close(fd);
- return ret;
+ /* 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), NULL, 0);
+ if (!o || o->type != commit_type)
+ return 0;
+ old = (struct commit *) o;
+
+ 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;
+
+ used = list = NULL;
+ commit_list_insert(new, &list);
+ while (list) {
+ new = pop_most_recent_commit(&list, 1);
+ commit_list_insert(new, &used);
+ if (new == old) {
+ found = 1;
+ break;
+ }
+ }
+ unmark_and_free(list, 1);
+ unmark_and_free(used, 1);
+ return found;
}
-static int send_pack(int in, int out, int nr_match, char **match)
+static struct ref *local_refs, **local_tail;
+static struct ref *remote_refs, **remote_tail;
+
+static int one_local_ref(const char *refname, const unsigned char *sha1)
{
- struct ref *ref_list = NULL, **last_ref = &ref_list;
struct ref *ref;
+ int len = strlen(refname) + 1;
+ ref = xcalloc(1, sizeof(*ref) + len);
+ memcpy(ref->new_sha1, sha1, 20);
+ memcpy(ref->name, refname, len);
+ *local_tail = ref;
+ local_tail = &ref->next;
+ return 0;
+}
- for (;;) {
- unsigned char old_sha1[20];
- unsigned char new_sha1[20];
- static char buffer[1000];
- char *name;
- int len;
+static void get_local_heads(void)
+{
+ local_tail = &local_refs;
+ for_each_ref(one_local_ref);
+}
- len = packet_read_line(in, buffer, sizeof(buffer));
- if (!len)
- break;
- if (buffer[len-1] == '\n')
- buffer[--len] = 0;
+static int send_pack(int in, int out, int nr_refspec, char **refspec)
+{
+ struct ref *ref;
+ int new_refs;
+
+ /* No funny business with the matcher */
+ remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, 1);
+ get_local_heads();
- if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
- die("protocol error: expected sha/ref, got '%s'", buffer);
- name = buffer + 41;
- if (nr_match && !path_match(name, nr_match, match))
+ /* match them up */
+ if (!remote_tail)
+ remote_tail = &remote_refs;
+ if (match_refs(local_refs, remote_refs, &remote_tail,
+ nr_refspec, refspec, send_all))
+ return -1;
+ /*
+ * Finally, tell the other end!
+ */
+ new_refs = 0;
+ for (ref = remote_refs; ref; ref = ref->next) {
+ char old_hex[60], *new_hex;
+ if (!ref->peer_ref)
continue;
- if (read_ref(name, new_sha1) < 0)
- return error("no such local reference '%s'", name);
- if (!has_sha1_file(old_sha1))
- return error("remote '%s' points to object I don't have", name);
- if (!memcmp(old_sha1, new_sha1, 20)) {
- fprintf(stderr, "'%s' unchanged\n", name);
+ if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
+ fprintf(stderr, "'%s': up-to-date\n", ref->name);
continue;
}
- ref = xmalloc(sizeof(*ref) + len - 40);
- memcpy(ref->old_sha1, old_sha1, 20);
- memcpy(ref->new_sha1, new_sha1, 20);
- memcpy(ref->name, buffer + 41, len - 40);
- ref->next = NULL;
- *last_ref = ref;
- last_ref = &ref->next;
- }
- for (ref = ref_list; ref; ref = ref->next) {
- char old_hex[60], *new_hex;
+ /* This part determines what can overwrite what.
+ * The rules are:
+ *
+ * (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.
+ *
+ * (2) if you do not have the old thing, you are not allowed
+ * to overwrite it; you would not know what you are losing
+ * otherwise.
+ *
+ * (3) if both new and old are commit-ish, and new is a
+ * descendant of old, it is OK.
+ */
+
+ 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));
+ continue;
+ }
+
+ /* We assume that local is fsck-clean. Otherwise
+ * 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,
+ ref->old_sha1)) {
+ error("remote ref '%s' is not a strict "
+ "subset of local ref '%s'.", ref->name,
+ ref->peer_ref->name);
+ continue;
+ }
+ }
+ memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
+ if (is_zero_sha1(ref->new_sha1)) {
+ error("cannot happen anymore");
+ continue;
+ }
+ new_refs++;
strcpy(old_hex, sha1_to_hex(ref->old_sha1));
new_hex = sha1_to_hex(ref->new_sha1);
packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
- fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex);
+ fprintf(stderr, "updating '%s'", ref->name);
+ if (strcmp(ref->name, ref->peer_ref->name))
+ fprintf(stderr, " using '%s'", ref->peer_ref->name);
+ fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
}
-
+
packet_flush(out);
- if (ref_list)
- pack_objects(out, ref_list);
+ if (new_refs)
+ pack_objects(out, remote_refs);
close(out);
return 0;
}
+
int main(int argc, char **argv)
{
int i, nr_heads = 0;
pid_t pid;
argv++;
- for (i = 1; i < argc; i++) {
- char *arg = *argv++;
+ for (i = 1; i < argc; i++, argv++) {
+ char *arg = *argv;
if (*arg == '-') {
if (!strncmp(arg, "--exec=", 7)) {
exec = arg + 7;
continue;
}
+ if (!strcmp(arg, "--all")) {
+ send_all = 1;
+ continue;
+ }
+ if (!strcmp(arg, "--force")) {
+ force_update = 1;
+ continue;
+ }
usage(send_pack_usage);
}
- dest = arg;
+ if (!dest) {
+ dest = arg;
+ continue;
+ }
heads = argv;
- nr_heads = argc - i -1;
+ nr_heads = argc - i;
break;
}
if (!dest)
usage(send_pack_usage);
+ if (heads && send_all)
+ usage(send_pack_usage);
pid = git_connect(fd, dest, exec);
if (pid < 0)
return 1;