334f4831e5
Previously, we updated the tracking refs (which match refs we are pushing) while generating the list of refs to send. However, at that point we don't know whether the refs were accepted. Instead, we now wait until we get a response code from the server. If an error was indicated, we don't update any local tracking refs. Technically some refs could have been updated on the remote, but since the local ref update is just an optimization to avoid an extra fetch, we are better off erring on the side of correctness. The user-visible message is now generated much later in the program, and has been tweaked to make more sense. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
464 lines
11 KiB
C
464 lines
11 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "refs.h"
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#include "pkt-line.h"
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#include "run-command.h"
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#include "remote.h"
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static const char send_pack_usage[] =
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"git-send-pack [--all] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
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" --all and explicit <ref> specification are mutually exclusive.";
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static const char *receivepack = "git-receive-pack";
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static int verbose;
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static int send_all;
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static int force_update;
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static int use_thin_pack;
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static int dry_run;
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/*
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* Make a pack stream and spit it out into file descriptor fd
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*/
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static int pack_objects(int fd, struct ref *refs)
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{
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/*
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* The child becomes pack-objects --revs; we feed
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* the revision parameters to it via its stdin and
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* let its stdout go back to the other end.
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*/
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const char *args[] = {
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"pack-objects",
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"--all-progress",
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"--revs",
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"--stdout",
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NULL,
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NULL,
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};
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struct child_process po;
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if (use_thin_pack)
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args[4] = "--thin";
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memset(&po, 0, sizeof(po));
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po.argv = args;
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po.in = -1;
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po.out = fd;
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po.git_cmd = 1;
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if (start_command(&po))
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die("git-pack-objects failed (%s)", strerror(errno));
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/*
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* We feed the pack-objects we just spawned with revision
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* parameters by writing to the pipe.
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*/
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while (refs) {
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char buf[42];
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if (!is_null_sha1(refs->old_sha1) &&
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has_sha1_file(refs->old_sha1)) {
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memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
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buf[0] = '^';
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buf[41] = '\n';
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if (!write_or_whine(po.in, buf, 42,
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"send-pack: send refs"))
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break;
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}
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if (!is_null_sha1(refs->new_sha1)) {
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memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
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buf[40] = '\n';
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if (!write_or_whine(po.in, buf, 41,
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"send-pack: send refs"))
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break;
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}
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refs = refs->next;
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}
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if (finish_command(&po))
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return error("pack-objects died with strange error");
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return 0;
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}
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static void unmark_and_free(struct commit_list *list, unsigned int mark)
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{
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while (list) {
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struct commit_list *temp = list;
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temp->item->object.flags &= ~mark;
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list = temp->next;
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free(temp);
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}
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}
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static int ref_newer(const unsigned char *new_sha1,
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const unsigned char *old_sha1)
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{
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struct object *o;
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struct commit *old, *new;
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struct commit_list *list, *used;
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int found = 0;
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/* Both new and old must be commit-ish and new is descendant of
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* old. Otherwise we require --force.
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*/
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o = deref_tag(parse_object(old_sha1), NULL, 0);
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if (!o || o->type != OBJ_COMMIT)
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return 0;
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old = (struct commit *) o;
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o = deref_tag(parse_object(new_sha1), NULL, 0);
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if (!o || o->type != OBJ_COMMIT)
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return 0;
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new = (struct commit *) o;
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if (parse_commit(new) < 0)
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return 0;
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used = list = NULL;
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commit_list_insert(new, &list);
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while (list) {
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new = pop_most_recent_commit(&list, 1);
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commit_list_insert(new, &used);
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if (new == old) {
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found = 1;
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break;
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}
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}
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unmark_and_free(list, 1);
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unmark_and_free(used, 1);
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return found;
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}
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static struct ref *local_refs, **local_tail;
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static struct ref *remote_refs, **remote_tail;
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static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
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{
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struct ref *ref;
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int len = strlen(refname) + 1;
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ref = xcalloc(1, sizeof(*ref) + len);
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hashcpy(ref->new_sha1, sha1);
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memcpy(ref->name, refname, len);
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*local_tail = ref;
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local_tail = &ref->next;
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return 0;
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}
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static void get_local_heads(void)
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{
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local_tail = &local_refs;
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for_each_ref(one_local_ref, NULL);
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}
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static int receive_status(int in)
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{
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char line[1000];
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int ret = 0;
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int len = packet_read_line(in, line, sizeof(line));
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if (len < 10 || memcmp(line, "unpack ", 7)) {
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fprintf(stderr, "did not receive status back\n");
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return -1;
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}
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if (memcmp(line, "unpack ok\n", 10)) {
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fputs(line, stderr);
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ret = -1;
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}
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while (1) {
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len = packet_read_line(in, line, sizeof(line));
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if (!len)
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break;
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if (len < 3 ||
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(memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
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fprintf(stderr, "protocol error: %s\n", line);
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ret = -1;
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break;
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}
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if (!memcmp(line, "ok", 2))
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continue;
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fputs(line, stderr);
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ret = -1;
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}
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return ret;
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}
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static void update_tracking_ref(struct remote *remote, struct ref *ref)
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{
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struct refspec rs;
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int will_delete_ref;
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rs.src = ref->name;
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rs.dst = NULL;
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if (!ref->peer_ref)
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return;
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will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
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if (!will_delete_ref &&
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!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1))
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return;
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if (!remote_find_tracking(remote, &rs)) {
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fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst);
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if (is_null_sha1(ref->peer_ref->new_sha1)) {
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if (delete_ref(rs.dst, NULL))
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error("Failed to delete");
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} else
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update_ref("update by push", rs.dst,
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ref->new_sha1, NULL, 0, 0);
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free(rs.dst);
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}
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}
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static int send_pack(int in, int out, struct remote *remote, int nr_refspec, char **refspec)
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{
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struct ref *ref;
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int new_refs;
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int ret = 0;
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int ask_for_status_report = 0;
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int allow_deleting_refs = 0;
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int expect_status_report = 0;
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/* No funny business with the matcher */
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remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
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get_local_heads();
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/* Does the other end support the reporting? */
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if (server_supports("report-status"))
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ask_for_status_report = 1;
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if (server_supports("delete-refs"))
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allow_deleting_refs = 1;
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/* match them up */
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if (!remote_tail)
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remote_tail = &remote_refs;
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if (match_refs(local_refs, remote_refs, &remote_tail,
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nr_refspec, refspec, send_all))
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return -1;
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if (!remote_refs) {
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fprintf(stderr, "No refs in common and none specified; doing nothing.\n"
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"Perhaps you should specify a branch such as 'master'.\n");
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return 0;
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}
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/*
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* Finally, tell the other end!
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*/
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new_refs = 0;
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for (ref = remote_refs; ref; ref = ref->next) {
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char old_hex[60], *new_hex;
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int will_delete_ref;
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if (!ref->peer_ref)
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continue;
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will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
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if (will_delete_ref && !allow_deleting_refs) {
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error("remote does not support deleting refs");
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ret = -2;
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continue;
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}
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if (!will_delete_ref &&
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!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
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if (verbose)
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fprintf(stderr, "'%s': up-to-date\n", ref->name);
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continue;
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}
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/* This part determines what can overwrite what.
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* The rules are:
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*
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* (0) you can always use --force or +A:B notation to
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* selectively force individual ref pairs.
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*
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* (1) if the old thing does not exist, it is OK.
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*
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* (2) if you do not have the old thing, you are not allowed
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* to overwrite it; you would not know what you are losing
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* otherwise.
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*
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* (3) if both new and old are commit-ish, and new is a
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* descendant of old, it is OK.
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*
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* (4) regardless of all of the above, removing :B is
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* always allowed.
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*/
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if (!force_update &&
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!will_delete_ref &&
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!is_null_sha1(ref->old_sha1) &&
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!ref->force) {
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if (!has_sha1_file(ref->old_sha1) ||
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!ref_newer(ref->peer_ref->new_sha1,
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ref->old_sha1)) {
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/* We do not have the remote ref, or
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* we know that the remote ref is not
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* an ancestor of what we are trying to
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* push. Either way this can be losing
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* commits at the remote end and likely
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* we were not up to date to begin with.
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*/
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error("remote '%s' is not a strict "
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"subset of local ref '%s'. "
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"maybe you are not up-to-date and "
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"need to pull first?",
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ref->name,
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ref->peer_ref->name);
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ret = -2;
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continue;
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}
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}
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hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
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if (!will_delete_ref)
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new_refs++;
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strcpy(old_hex, sha1_to_hex(ref->old_sha1));
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new_hex = sha1_to_hex(ref->new_sha1);
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if (!dry_run) {
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if (ask_for_status_report) {
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packet_write(out, "%s %s %s%c%s",
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old_hex, new_hex, ref->name, 0,
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"report-status");
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ask_for_status_report = 0;
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expect_status_report = 1;
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}
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else
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packet_write(out, "%s %s %s",
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old_hex, new_hex, ref->name);
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}
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if (will_delete_ref)
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fprintf(stderr, "deleting '%s'\n", ref->name);
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else {
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fprintf(stderr, "updating '%s'", ref->name);
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if (strcmp(ref->name, ref->peer_ref->name))
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fprintf(stderr, " using '%s'",
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ref->peer_ref->name);
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fprintf(stderr, "\n from %s\n to %s\n",
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old_hex, new_hex);
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}
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}
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packet_flush(out);
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if (new_refs && !dry_run)
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ret = pack_objects(out, remote_refs);
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close(out);
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if (expect_status_report) {
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if (receive_status(in))
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ret = -4;
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}
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if (!dry_run && remote && ret == 0) {
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for (ref = remote_refs; ref; ref = ref->next)
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update_tracking_ref(remote, ref);
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}
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if (!new_refs && ret == 0)
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fprintf(stderr, "Everything up-to-date\n");
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return ret;
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}
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static void verify_remote_names(int nr_heads, char **heads)
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{
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int i;
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for (i = 0; i < nr_heads; i++) {
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const char *remote = strchr(heads[i], ':');
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remote = remote ? (remote + 1) : heads[i];
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switch (check_ref_format(remote)) {
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case 0: /* ok */
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case -2: /* ok but a single level -- that is fine for
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* a match pattern.
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*/
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case -3: /* ok but ends with a pattern-match character */
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continue;
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}
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die("remote part of refspec is not a valid name in %s",
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heads[i]);
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}
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}
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int main(int argc, char **argv)
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{
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int i, nr_heads = 0;
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char *dest = NULL;
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char **heads = NULL;
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int fd[2], ret;
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pid_t pid;
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char *remote_name = NULL;
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struct remote *remote = NULL;
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setup_git_directory();
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git_config(git_default_config);
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argv++;
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for (i = 1; i < argc; i++, argv++) {
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char *arg = *argv;
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if (*arg == '-') {
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if (!prefixcmp(arg, "--receive-pack=")) {
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receivepack = arg + 15;
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continue;
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}
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if (!prefixcmp(arg, "--exec=")) {
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receivepack = arg + 7;
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continue;
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}
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if (!prefixcmp(arg, "--remote=")) {
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remote_name = arg + 9;
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continue;
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}
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if (!strcmp(arg, "--all")) {
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send_all = 1;
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continue;
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}
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if (!strcmp(arg, "--dry-run")) {
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dry_run = 1;
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continue;
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}
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if (!strcmp(arg, "--force")) {
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force_update = 1;
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continue;
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}
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if (!strcmp(arg, "--verbose")) {
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verbose = 1;
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continue;
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}
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if (!strcmp(arg, "--thin")) {
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use_thin_pack = 1;
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continue;
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}
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usage(send_pack_usage);
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}
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if (!dest) {
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dest = arg;
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continue;
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}
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heads = argv;
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nr_heads = argc - i;
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break;
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}
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if (!dest)
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usage(send_pack_usage);
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if (heads && send_all)
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usage(send_pack_usage);
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verify_remote_names(nr_heads, heads);
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if (remote_name) {
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remote = remote_get(remote_name);
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if (!remote_has_uri(remote, dest)) {
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die("Destination %s is not a uri for %s",
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dest, remote_name);
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}
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}
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pid = git_connect(fd, dest, receivepack, verbose ? CONNECT_VERBOSE : 0);
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if (pid < 0)
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return 1;
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ret = send_pack(fd[0], fd[1], remote, nr_heads, heads);
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close(fd[0]);
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close(fd[1]);
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ret |= finish_connect(pid);
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return !!ret;
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}
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