diff options
Diffstat (limited to 'builtin-send-pack.c')
| -rw-r--r-- | builtin-send-pack.c | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/builtin-send-pack.c b/builtin-send-pack.c new file mode 100644 index 0000000000..22cb50bc2b --- /dev/null +++ b/builtin-send-pack.c @@ -0,0 +1,469 @@ +#include "cache.h" +#include "commit.h" +#include "tag.h" +#include "refs.h" +#include "pkt-line.h" +#include "run-command.h" +#include "remote.h" +#include "send-pack.h" + +static const char send_pack_usage[] = +"git-send-pack [--all] [--dry-run] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n" +" --all and explicit <ref> specification are mutually exclusive."; + +static struct send_pack_args args = { + /* .receivepack = */ "git-receive-pack", +}; + +/* + * Make a pack stream and spit it out into file descriptor fd + */ +static int pack_objects(int fd, struct ref *refs) +{ + /* + * The child becomes pack-objects --revs; we feed + * the revision parameters to it via its stdin and + * let its stdout go back to the other end. + */ + const char *argv[] = { + "pack-objects", + "--all-progress", + "--revs", + "--stdout", + NULL, + NULL, + }; + struct child_process po; + + if (args.use_thin_pack) + argv[4] = "--thin"; + memset(&po, 0, sizeof(po)); + po.argv = argv; + po.in = -1; + po.out = fd; + po.git_cmd = 1; + if (start_command(&po)) + die("git-pack-objects failed (%s)", strerror(errno)); + + /* + * We feed the pack-objects we just spawned with revision + * parameters by writing to the pipe. + */ + while (refs) { + char buf[42]; + + if (!is_null_sha1(refs->old_sha1) && + has_sha1_file(refs->old_sha1)) { + memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40); + buf[0] = '^'; + buf[41] = '\n'; + if (!write_or_whine(po.in, buf, 42, + "send-pack: send refs")) + break; + } + if (!is_null_sha1(refs->new_sha1)) { + memcpy(buf, sha1_to_hex(refs->new_sha1), 40); + buf[40] = '\n'; + if (!write_or_whine(po.in, buf, 41, + "send-pack: send refs")) + break; + } + refs = refs->next; + } + + if (finish_command(&po)) + return error("pack-objects died with strange error"); + 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, *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), NULL, 0); + if (!o || o->type != OBJ_COMMIT) + return 0; + old = (struct commit *) o; + + o = deref_tag(parse_object(new_sha1), NULL, 0); + if (!o || o->type != OBJ_COMMIT) + 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 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, int flag, void *cb_data) +{ + struct ref *ref; + int len = strlen(refname) + 1; + ref = xcalloc(1, sizeof(*ref) + len); + hashcpy(ref->new_sha1, sha1); + memcpy(ref->name, refname, len); + *local_tail = ref; + local_tail = &ref->next; + return 0; +} + +static void get_local_heads(void) +{ + local_tail = &local_refs; + for_each_ref(one_local_ref, NULL); +} + +static int receive_status(int in) +{ + char line[1000]; + int ret = 0; + int len = packet_read_line(in, line, sizeof(line)); + if (len < 10 || memcmp(line, "unpack ", 7)) { + fprintf(stderr, "did not receive status back\n"); + return -1; + } + if (memcmp(line, "unpack ok\n", 10)) { + fputs(line, stderr); + ret = -1; + } + while (1) { + len = packet_read_line(in, line, sizeof(line)); + if (!len) + break; + if (len < 3 || + (memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) { + fprintf(stderr, "protocol error: %s\n", line); + ret = -1; + break; + } + if (!memcmp(line, "ok", 2)) + continue; + fputs(line, stderr); + ret = -1; + } + return ret; +} + +static void update_tracking_ref(struct remote *remote, struct ref *ref) +{ + struct refspec rs; + int will_delete_ref; + + rs.src = ref->name; + rs.dst = NULL; + + if (!ref->peer_ref) + return; + + will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1); + + if (!will_delete_ref && + !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) + return; + + if (!remote_find_tracking(remote, &rs)) { + fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst); + if (is_null_sha1(ref->peer_ref->new_sha1)) { + if (delete_ref(rs.dst, NULL)) + error("Failed to delete"); + } else + update_ref("update by push", rs.dst, + ref->new_sha1, NULL, 0, 0); + free(rs.dst); + } +} + +static int do_send_pack(int in, int out, struct remote *remote, int nr_refspec, const char **refspec) +{ + struct ref *ref; + int new_refs; + int ret = 0; + int ask_for_status_report = 0; + int allow_deleting_refs = 0; + int expect_status_report = 0; + + /* No funny business with the matcher */ + remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL); + get_local_heads(); + + /* Does the other end support the reporting? */ + if (server_supports("report-status")) + ask_for_status_report = 1; + if (server_supports("delete-refs")) + allow_deleting_refs = 1; + + /* match them up */ + if (!remote_tail) + remote_tail = &remote_refs; + if (match_refs(local_refs, remote_refs, &remote_tail, + nr_refspec, refspec, args.send_all)) + return -1; + + if (!remote_refs) { + fprintf(stderr, "No refs in common and none specified; doing nothing.\n" + "Perhaps you should specify a branch such as 'master'.\n"); + return 0; + } + + /* + * Finally, tell the other end! + */ + new_refs = 0; + for (ref = remote_refs; ref; ref = ref->next) { + char old_hex[60], *new_hex; + int will_delete_ref; + + if (!ref->peer_ref) + continue; + + + will_delete_ref = is_null_sha1(ref->peer_ref->new_sha1); + if (will_delete_ref && !allow_deleting_refs) { + error("remote does not support deleting refs"); + ret = -2; + continue; + } + if (!will_delete_ref && + !hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) { + if (args.verbose) + fprintf(stderr, "'%s': up-to-date\n", ref->name); + continue; + } + + /* 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. + * + * (4) regardless of all of the above, removing :B is + * always allowed. + */ + + if (!args.force_update && + !will_delete_ref && + !is_null_sha1(ref->old_sha1) && + !ref->force) { + if (!has_sha1_file(ref->old_sha1) || + !ref_newer(ref->peer_ref->new_sha1, + ref->old_sha1)) { + /* We do not have the remote ref, or + * we know that the remote ref is not + * an ancestor of what we are trying to + * push. Either way this can be losing + * commits at the remote end and likely + * we were not up to date to begin with. + */ + error("remote '%s' is not an ancestor of\n" + " local '%s'.\n" + " Maybe you are not up-to-date and " + "need to pull first?", + ref->name, + ref->peer_ref->name); + ret = -2; + continue; + } + } + hashcpy(ref->new_sha1, ref->peer_ref->new_sha1); + if (!will_delete_ref) + new_refs++; + strcpy(old_hex, sha1_to_hex(ref->old_sha1)); + new_hex = sha1_to_hex(ref->new_sha1); + + if (!args.dry_run) { + if (ask_for_status_report) { + packet_write(out, "%s %s %s%c%s", + old_hex, new_hex, ref->name, 0, + "report-status"); + ask_for_status_report = 0; + expect_status_report = 1; + } + else + packet_write(out, "%s %s %s", + old_hex, new_hex, ref->name); + } + if (will_delete_ref) + fprintf(stderr, "deleting '%s'\n", ref->name); + else { + 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 (new_refs && !args.dry_run) + ret = pack_objects(out, remote_refs); + close(out); + + if (expect_status_report) { + if (receive_status(in)) + ret = -4; + } + + if (!args.dry_run && remote && ret == 0) { + for (ref = remote_refs; ref; ref = ref->next) + if (!is_null_sha1(ref->new_sha1)) + update_tracking_ref(remote, ref); + } + + if (!new_refs && ret == 0) + fprintf(stderr, "Everything up-to-date\n"); + return ret; +} + +static void verify_remote_names(int nr_heads, const char **heads) +{ + int i; + + for (i = 0; i < nr_heads; i++) { + const char *remote = strchr(heads[i], ':'); + + remote = remote ? (remote + 1) : heads[i]; + switch (check_ref_format(remote)) { + case 0: /* ok */ + case -2: /* ok but a single level -- that is fine for + * a match pattern. + */ + case -3: /* ok but ends with a pattern-match character */ + continue; + } + die("remote part of refspec is not a valid name in %s", + heads[i]); + } +} + +int cmd_send_pack(int argc, const char **argv, const char *prefix) +{ + int i, nr_heads = 0; + const char **heads = NULL; + const char *remote_name = NULL; + struct remote *remote = NULL; + const char *dest = NULL; + + argv++; + for (i = 1; i < argc; i++, argv++) { + const char *arg = *argv; + + if (*arg == '-') { + if (!prefixcmp(arg, "--receive-pack=")) { + args.receivepack = arg + 15; + continue; + } + if (!prefixcmp(arg, "--exec=")) { + args.receivepack = arg + 7; + continue; + } + if (!prefixcmp(arg, "--remote=")) { + remote_name = arg + 9; + continue; + } + if (!strcmp(arg, "--all")) { + args.send_all = 1; + continue; + } + if (!strcmp(arg, "--dry-run")) { + args.dry_run = 1; + continue; + } + if (!strcmp(arg, "--force")) { + args.force_update = 1; + continue; + } + if (!strcmp(arg, "--verbose")) { + args.verbose = 1; + continue; + } + if (!strcmp(arg, "--thin")) { + args.use_thin_pack = 1; + continue; + } + usage(send_pack_usage); + } + if (!dest) { + dest = arg; + continue; + } + heads = (const char **) argv; + nr_heads = argc - i; + break; + } + if (!dest) + usage(send_pack_usage); + if (heads && args.send_all) + usage(send_pack_usage); + + if (remote_name) { + remote = remote_get(remote_name); + if (!remote_has_url(remote, dest)) { + die("Destination %s is not a uri for %s", + dest, remote_name); + } + } + + return send_pack(&args, dest, remote, nr_heads, heads); +} + +int send_pack(struct send_pack_args *my_args, + const char *dest, struct remote *remote, + int nr_heads, const char **heads) +{ + int fd[2], ret; + struct child_process *conn; + + memcpy(&args, my_args, sizeof(args)); + + verify_remote_names(nr_heads, heads); + + conn = git_connect(fd, dest, args.receivepack, args.verbose ? CONNECT_VERBOSE : 0); + ret = do_send_pack(fd[0], fd[1], remote, nr_heads, heads); + close(fd[0]); + close(fd[1]); + ret |= finish_connect(conn); + return !!ret; +} |