diff options
Diffstat (limited to 'builtin-send-pack.c')
| -rw-r--r-- | builtin-send-pack.c | 663 |
1 files changed, 663 insertions, 0 deletions
diff --git a/builtin-send-pack.c b/builtin-send-pack.c new file mode 100644 index 0000000000..d76260c09e --- /dev/null +++ b/builtin-send-pack.c @@ -0,0 +1,663 @@ +#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 | --mirror] [--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; + } + + close(po.in); + 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, struct ref *refs) +{ + struct ref *hint; + char line[1000]; + int ret = 0; + int len = packet_read_line(in, line, sizeof(line)); + if (len < 10 || memcmp(line, "unpack ", 7)) + return error("did not receive remote status"); + if (memcmp(line, "unpack ok\n", 10)) { + char *p = line + strlen(line) - 1; + if (*p == '\n') + *p = '\0'; + error("unpack failed: %s", line + 7); + ret = -1; + } + hint = NULL; + while (1) { + char *refname; + char *msg; + len = packet_read_line(in, line, sizeof(line)); + if (!len) + break; + if (len < 3 || + (memcmp(line, "ok ", 3) && memcmp(line, "ng ", 3))) { + fprintf(stderr, "protocol error: %s\n", line); + ret = -1; + break; + } + + line[strlen(line)-1] = '\0'; + refname = line + 3; + msg = strchr(refname, ' '); + if (msg) + *msg++ = '\0'; + + /* first try searching at our hint, falling back to all refs */ + if (hint) + hint = find_ref_by_name(hint, refname); + if (!hint) + hint = find_ref_by_name(refs, refname); + if (!hint) { + warning("remote reported status on unknown ref: %s", + refname); + continue; + } + if (hint->status != REF_STATUS_EXPECTING_REPORT) { + warning("remote reported status on unexpected ref: %s", + refname); + continue; + } + + if (line[0] == 'o' && line[1] == 'k') + hint->status = REF_STATUS_OK; + else { + hint->status = REF_STATUS_REMOTE_REJECT; + ret = -1; + } + if (msg) + hint->remote_status = xstrdup(msg); + /* start our next search from the next ref */ + hint = hint->next; + } + return ret; +} + +static void update_tracking_ref(struct remote *remote, struct ref *ref) +{ + struct refspec rs; + + if (ref->status != REF_STATUS_OK) + return; + + rs.src = ref->name; + rs.dst = NULL; + + if (!remote_find_tracking(remote, &rs)) { + if (args.verbose) + fprintf(stderr, "updating local tracking ref '%s'\n", rs.dst); + if (ref->deletion) { + 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 const char *prettify_ref(const struct ref *ref) +{ + const char *name = ref->name; + return name + ( + !prefixcmp(name, "refs/heads/") ? 11 : + !prefixcmp(name, "refs/tags/") ? 10 : + !prefixcmp(name, "refs/remotes/") ? 13 : + 0); +} + +#define SUMMARY_WIDTH (2 * DEFAULT_ABBREV + 3) + +static void print_ref_status(char flag, const char *summary, struct ref *to, struct ref *from, const char *msg) +{ + fprintf(stderr, " %c %-*s ", flag, SUMMARY_WIDTH, summary); + if (from) + fprintf(stderr, "%s -> %s", prettify_ref(from), prettify_ref(to)); + else + fputs(prettify_ref(to), stderr); + if (msg) { + fputs(" (", stderr); + fputs(msg, stderr); + fputc(')', stderr); + } + fputc('\n', stderr); +} + +static const char *status_abbrev(unsigned char sha1[20]) +{ + return find_unique_abbrev(sha1, DEFAULT_ABBREV); +} + +static void print_ok_ref_status(struct ref *ref) +{ + if (ref->deletion) + print_ref_status('-', "[deleted]", ref, NULL, NULL); + else if (is_null_sha1(ref->old_sha1)) + print_ref_status('*', + (!prefixcmp(ref->name, "refs/tags/") ? "[new tag]" : + "[new branch]"), + ref, ref->peer_ref, NULL); + else { + char quickref[84]; + char type; + const char *msg; + + strcpy(quickref, status_abbrev(ref->old_sha1)); + if (ref->nonfastforward) { + strcat(quickref, "..."); + type = '+'; + msg = "forced update"; + } else { + strcat(quickref, ".."); + type = ' '; + msg = NULL; + } + strcat(quickref, status_abbrev(ref->new_sha1)); + + print_ref_status(type, quickref, ref, ref->peer_ref, msg); + } +} + +static int print_one_push_status(struct ref *ref, const char *dest, int count) +{ + if (!count) + fprintf(stderr, "To %s\n", dest); + + switch(ref->status) { + case REF_STATUS_NONE: + print_ref_status('X', "[no match]", ref, NULL, NULL); + break; + case REF_STATUS_REJECT_NODELETE: + print_ref_status('!', "[rejected]", ref, NULL, + "remote does not support deleting refs"); + break; + case REF_STATUS_UPTODATE: + print_ref_status('=', "[up to date]", ref, + ref->peer_ref, NULL); + break; + case REF_STATUS_REJECT_NONFASTFORWARD: + print_ref_status('!', "[rejected]", ref, ref->peer_ref, + "non-fast forward"); + break; + case REF_STATUS_REMOTE_REJECT: + print_ref_status('!', "[remote rejected]", ref, + ref->deletion ? NULL : ref->peer_ref, + ref->remote_status); + break; + case REF_STATUS_EXPECTING_REPORT: + print_ref_status('!', "[remote failure]", ref, + ref->deletion ? NULL : ref->peer_ref, + "remote failed to report status"); + break; + case REF_STATUS_OK: + print_ok_ref_status(ref); + break; + } + + return 1; +} + +static void print_push_status(const char *dest, struct ref *refs) +{ + struct ref *ref; + int n = 0; + + if (args.verbose) { + for (ref = refs; ref; ref = ref->next) + if (ref->status == REF_STATUS_UPTODATE) + n += print_one_push_status(ref, dest, n); + } + + for (ref = refs; ref; ref = ref->next) + if (ref->status == REF_STATUS_OK) + n += print_one_push_status(ref, dest, n); + + for (ref = refs; ref; ref = ref->next) { + if (ref->status != REF_STATUS_NONE && + ref->status != REF_STATUS_UPTODATE && + ref->status != REF_STATUS_OK) + n += print_one_push_status(ref, dest, n); + } +} + +static int refs_pushed(struct ref *ref) +{ + for (; ref; ref = ref->next) { + switch(ref->status) { + case REF_STATUS_NONE: + case REF_STATUS_UPTODATE: + break; + default: + return 1; + } + } + return 0; +} + +static int do_send_pack(int in, int out, struct remote *remote, const char *dest, int nr_refspec, const char **refspec) +{ + struct ref *ref; + int new_refs; + int ask_for_status_report = 0; + int allow_deleting_refs = 0; + int expect_status_report = 0; + int flags = MATCH_REFS_NONE; + int ret; + + if (args.send_all) + flags |= MATCH_REFS_ALL; + if (args.send_mirror) + flags |= MATCH_REFS_MIRROR; + + /* 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, flags)) { + close(out); + 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"); + close(out); + return 0; + } + + /* + * Finally, tell the other end! + */ + new_refs = 0; + for (ref = remote_refs; ref; ref = ref->next) { + const unsigned char *new_sha1; + + if (!ref->peer_ref) { + if (!args.send_mirror) + continue; + new_sha1 = null_sha1; + } + else + new_sha1 = ref->peer_ref->new_sha1; + + + ref->deletion = is_null_sha1(new_sha1); + if (ref->deletion && !allow_deleting_refs) { + ref->status = REF_STATUS_REJECT_NODELETE; + continue; + } + if (!ref->deletion && + !hashcmp(ref->old_sha1, new_sha1)) { + ref->status = REF_STATUS_UPTODATE; + 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. + */ + + ref->nonfastforward = + !ref->deletion && + !is_null_sha1(ref->old_sha1) && + (!has_sha1_file(ref->old_sha1) + || !ref_newer(new_sha1, ref->old_sha1)); + + if (ref->nonfastforward && !ref->force && !args.force_update) { + ref->status = REF_STATUS_REJECT_NONFASTFORWARD; + continue; + } + + hashcpy(ref->new_sha1, new_sha1); + if (!ref->deletion) + new_refs++; + + if (!args.dry_run) { + char *old_hex = sha1_to_hex(ref->old_sha1); + char *new_hex = sha1_to_hex(ref->new_sha1); + + 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); + } + ref->status = expect_status_report ? + REF_STATUS_EXPECTING_REPORT : + REF_STATUS_OK; + } + + packet_flush(out); + if (new_refs && !args.dry_run) { + if (pack_objects(out, remote_refs) < 0) + return -1; + } + else + close(out); + + if (expect_status_report) + ret = receive_status(in, remote_refs); + else + ret = 0; + + print_push_status(dest, remote_refs); + + if (!args.dry_run && remote) { + for (ref = remote_refs; ref; ref = ref->next) + update_tracking_ref(remote, ref); + } + + if (!refs_pushed(remote_refs)) + fprintf(stderr, "Everything up-to-date\n"); + if (ret < 0) + return ret; + for (ref = remote_refs; ref; ref = ref->next) { + switch (ref->status) { + case REF_STATUS_NONE: + case REF_STATUS_UPTODATE: + case REF_STATUS_OK: + break; + default: + return -1; + } + } + return 0; +} + +static void verify_remote_names(int nr_heads, const char **heads) +{ + int i; + + for (i = 0; i < nr_heads; i++) { + const char *local = heads[i]; + const char *remote = strrchr(heads[i], ':'); + + if (*local == '+') + local++; + + /* A matching refspec is okay. */ + if (remote == local && remote[1] == '\0') + continue; + + remote = remote ? (remote + 1) : local; + switch (check_ref_format(remote)) { + case 0: /* ok */ + case CHECK_REF_FORMAT_ONELEVEL: + /* ok but a single level -- that is fine for + * a match pattern. + */ + case CHECK_REF_FORMAT_WILDCARD: + /* 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, "--mirror")) { + args.send_mirror = 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); + /* + * --all and --mirror are incompatible; neither makes sense + * with any refspecs. + */ + if ((heads && (args.send_all || args.send_mirror)) || + (args.send_all && args.send_mirror)) + 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, dest, nr_heads, heads); + close(fd[0]); + /* do_send_pack always closes fd[1] */ + ret |= finish_connect(conn); + return !!ret; +} |