diff options
Diffstat (limited to 'send-pack.c')
| -rw-r--r-- | send-pack.c | 526 |
1 files changed, 526 insertions, 0 deletions
diff --git a/send-pack.c b/send-pack.c new file mode 100644 index 0000000000..9d2b0c52ed --- /dev/null +++ b/send-pack.c @@ -0,0 +1,526 @@ +#include "builtin.h" +#include "commit.h" +#include "refs.h" +#include "pkt-line.h" +#include "sideband.h" +#include "run-command.h" +#include "remote.h" +#include "connect.h" +#include "send-pack.h" +#include "quote.h" +#include "transport.h" +#include "version.h" +#include "sha1-array.h" +#include "gpg-interface.h" + +static int feed_object(const unsigned char *sha1, int fd, int negative) +{ + char buf[42]; + + if (negative && !has_sha1_file(sha1)) + return 1; + + memcpy(buf + negative, sha1_to_hex(sha1), 40); + if (negative) + buf[0] = '^'; + buf[40 + negative] = '\n'; + return write_or_whine(fd, buf, 41 + negative, "send-pack: send refs"); +} + +/* + * Make a pack stream and spit it out into file descriptor fd + */ +static int pack_objects(int fd, struct ref *refs, struct sha1_array *extra, struct send_pack_args *args) +{ + /* + * 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-implied", + "--revs", + "--stdout", + NULL, + NULL, + NULL, + NULL, + NULL, + NULL, + }; + struct child_process po = CHILD_PROCESS_INIT; + int i; + + i = 4; + if (args->use_thin_pack) + argv[i++] = "--thin"; + if (args->use_ofs_delta) + argv[i++] = "--delta-base-offset"; + if (args->quiet || !args->progress) + argv[i++] = "-q"; + if (args->progress) + argv[i++] = "--progress"; + if (is_repository_shallow()) + argv[i++] = "--shallow"; + po.argv = argv; + po.in = -1; + po.out = args->stateless_rpc ? -1 : fd; + po.git_cmd = 1; + if (start_command(&po)) + die_errno("git pack-objects failed"); + + /* + * We feed the pack-objects we just spawned with revision + * parameters by writing to the pipe. + */ + for (i = 0; i < extra->nr; i++) + if (!feed_object(extra->sha1[i], po.in, 1)) + break; + + while (refs) { + if (!is_null_sha1(refs->old_sha1) && + !feed_object(refs->old_sha1, po.in, 1)) + break; + if (!is_null_sha1(refs->new_sha1) && + !feed_object(refs->new_sha1, po.in, 0)) + break; + refs = refs->next; + } + + close(po.in); + + if (args->stateless_rpc) { + char *buf = xmalloc(LARGE_PACKET_MAX); + while (1) { + ssize_t n = xread(po.out, buf, LARGE_PACKET_MAX); + if (n <= 0) + break; + send_sideband(fd, -1, buf, n, LARGE_PACKET_MAX); + } + free(buf); + close(po.out); + po.out = -1; + } + + if (finish_command(&po)) + return -1; + return 0; +} + +static int receive_status(int in, struct ref *refs) +{ + struct ref *hint; + int ret = 0; + char *line = packet_read_line(in, NULL); + if (!starts_with(line, "unpack ")) + return error("did not receive remote status"); + if (strcmp(line, "unpack ok")) { + error("unpack failed: %s", line + 7); + ret = -1; + } + hint = NULL; + while (1) { + char *refname; + char *msg; + line = packet_read_line(in, NULL); + if (!line) + break; + if (!starts_with(line, "ok ") && !starts_with(line, "ng ")) { + error("invalid ref status from remote: %s", line); + ret = -1; + break; + } + + 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 int sideband_demux(int in, int out, void *data) +{ + int *fd = data, ret; +#ifdef NO_PTHREADS + close(fd[1]); +#endif + ret = recv_sideband("send-pack", fd[0], out); + close(out); + return ret; +} + +static int advertise_shallow_grafts_cb(const struct commit_graft *graft, void *cb) +{ + struct strbuf *sb = cb; + if (graft->nr_parent == -1) + packet_buf_write(sb, "shallow %s\n", sha1_to_hex(graft->sha1)); + return 0; +} + +static void advertise_shallow_grafts_buf(struct strbuf *sb) +{ + if (!is_repository_shallow()) + return; + for_each_commit_graft(advertise_shallow_grafts_cb, sb); +} + +#define CHECK_REF_NO_PUSH -1 +#define CHECK_REF_STATUS_REJECTED -2 +#define CHECK_REF_UPTODATE -3 +static int check_to_send_update(const struct ref *ref, const struct send_pack_args *args) +{ + if (!ref->peer_ref && !args->send_mirror) + return CHECK_REF_NO_PUSH; + + /* Check for statuses set by set_ref_status_for_push() */ + switch (ref->status) { + case REF_STATUS_REJECT_NONFASTFORWARD: + case REF_STATUS_REJECT_ALREADY_EXISTS: + case REF_STATUS_REJECT_FETCH_FIRST: + case REF_STATUS_REJECT_NEEDS_FORCE: + case REF_STATUS_REJECT_STALE: + case REF_STATUS_REJECT_NODELETE: + return CHECK_REF_STATUS_REJECTED; + case REF_STATUS_UPTODATE: + return CHECK_REF_UPTODATE; + default: + return 0; + } +} + +/* + * the beginning of the next line, or the end of buffer. + * + * NEEDSWORK: perhaps move this to git-compat-util.h or somewhere and + * convert many similar uses found by "git grep -A4 memchr". + */ +static const char *next_line(const char *line, size_t len) +{ + const char *nl = memchr(line, '\n', len); + if (!nl) + return line + len; /* incomplete line */ + return nl + 1; +} + +static int generate_push_cert(struct strbuf *req_buf, + const struct ref *remote_refs, + struct send_pack_args *args, + const char *cap_string, + const char *push_cert_nonce) +{ + const struct ref *ref; + char *signing_key = xstrdup(get_signing_key()); + const char *cp, *np; + struct strbuf cert = STRBUF_INIT; + int update_seen = 0; + + strbuf_addf(&cert, "certificate version 0.1\n"); + strbuf_addf(&cert, "pusher %s ", signing_key); + datestamp(&cert); + strbuf_addch(&cert, '\n'); + if (args->url && *args->url) { + char *anon_url = transport_anonymize_url(args->url); + strbuf_addf(&cert, "pushee %s\n", anon_url); + free(anon_url); + } + if (push_cert_nonce[0]) + strbuf_addf(&cert, "nonce %s\n", push_cert_nonce); + strbuf_addstr(&cert, "\n"); + + for (ref = remote_refs; ref; ref = ref->next) { + if (check_to_send_update(ref, args) < 0) + continue; + update_seen = 1; + strbuf_addf(&cert, "%s %s %s\n", + sha1_to_hex(ref->old_sha1), + sha1_to_hex(ref->new_sha1), + ref->name); + } + if (!update_seen) + goto free_return; + + if (sign_buffer(&cert, &cert, signing_key)) + die(_("failed to sign the push certificate")); + + packet_buf_write(req_buf, "push-cert%c%s", 0, cap_string); + for (cp = cert.buf; cp < cert.buf + cert.len; cp = np) { + np = next_line(cp, cert.buf + cert.len - cp); + packet_buf_write(req_buf, + "%.*s", (int)(np - cp), cp); + } + packet_buf_write(req_buf, "push-cert-end\n"); + +free_return: + free(signing_key); + strbuf_release(&cert); + return update_seen; +} + + +static int atomic_push_failure(struct send_pack_args *args, + struct ref *remote_refs, + struct ref *failing_ref) +{ + struct ref *ref; + /* Mark other refs as failed */ + for (ref = remote_refs; ref; ref = ref->next) { + if (!ref->peer_ref && !args->send_mirror) + continue; + + switch (ref->status) { + case REF_STATUS_EXPECTING_REPORT: + ref->status = REF_STATUS_ATOMIC_PUSH_FAILED; + continue; + default: + break; /* do nothing */ + } + } + return error("atomic push failed for ref %s. status: %d\n", + failing_ref->name, failing_ref->status); +} + +int send_pack(struct send_pack_args *args, + int fd[], struct child_process *conn, + struct ref *remote_refs, + struct sha1_array *extra_have) +{ + int in = fd[0]; + int out = fd[1]; + struct strbuf req_buf = STRBUF_INIT; + struct strbuf cap_buf = STRBUF_INIT; + struct ref *ref; + int need_pack_data = 0; + int allow_deleting_refs = 0; + int status_report = 0; + int use_sideband = 0; + int quiet_supported = 0; + int agent_supported = 0; + int use_atomic = 0; + int atomic_supported = 0; + unsigned cmds_sent = 0; + int ret; + struct async demux; + const char *push_cert_nonce = NULL; + + /* Does the other end support the reporting? */ + if (server_supports("report-status")) + status_report = 1; + if (server_supports("delete-refs")) + allow_deleting_refs = 1; + if (server_supports("ofs-delta")) + args->use_ofs_delta = 1; + if (server_supports("side-band-64k")) + use_sideband = 1; + if (server_supports("quiet")) + quiet_supported = 1; + if (server_supports("agent")) + agent_supported = 1; + if (server_supports("no-thin")) + args->use_thin_pack = 0; + if (server_supports("atomic")) + atomic_supported = 1; + if (args->push_cert) { + int len; + + push_cert_nonce = server_feature_value("push-cert", &len); + if (!push_cert_nonce) + die(_("the receiving end does not support --signed push")); + push_cert_nonce = xmemdupz(push_cert_nonce, len); + } + + 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; + } + if (args->atomic && !atomic_supported) + die(_("server does not support --atomic push")); + + use_atomic = atomic_supported && args->atomic; + + if (status_report) + strbuf_addstr(&cap_buf, " report-status"); + if (use_sideband) + strbuf_addstr(&cap_buf, " side-band-64k"); + if (quiet_supported && (args->quiet || !args->progress)) + strbuf_addstr(&cap_buf, " quiet"); + if (use_atomic) + strbuf_addstr(&cap_buf, " atomic"); + if (agent_supported) + strbuf_addf(&cap_buf, " agent=%s", git_user_agent_sanitized()); + + /* + * NEEDSWORK: why does delete-refs have to be so specific to + * send-pack machinery that set_ref_status_for_push() cannot + * set this bit for us??? + */ + for (ref = remote_refs; ref; ref = ref->next) + if (ref->deletion && !allow_deleting_refs) + ref->status = REF_STATUS_REJECT_NODELETE; + + if (!args->dry_run) + advertise_shallow_grafts_buf(&req_buf); + + if (!args->dry_run && args->push_cert) + cmds_sent = generate_push_cert(&req_buf, remote_refs, args, + cap_buf.buf, push_cert_nonce); + + /* + * Clear the status for each ref and see if we need to send + * the pack data. + */ + for (ref = remote_refs; ref; ref = ref->next) { + switch (check_to_send_update(ref, args)) { + case 0: /* no error */ + break; + case CHECK_REF_STATUS_REJECTED: + /* + * When we know the server would reject a ref update if + * we were to send it and we're trying to send the refs + * atomically, abort the whole operation. + */ + if (use_atomic) + return atomic_push_failure(args, remote_refs, ref); + /* Fallthrough for non atomic case. */ + default: + continue; + } + if (!ref->deletion) + need_pack_data = 1; + + if (args->dry_run || !status_report) + ref->status = REF_STATUS_OK; + else + ref->status = REF_STATUS_EXPECTING_REPORT; + } + + /* + * Finally, tell the other end! + */ + for (ref = remote_refs; ref; ref = ref->next) { + char *old_hex, *new_hex; + + if (args->dry_run || args->push_cert) + continue; + + if (check_to_send_update(ref, args) < 0) + continue; + + old_hex = sha1_to_hex(ref->old_sha1); + new_hex = sha1_to_hex(ref->new_sha1); + if (!cmds_sent) { + packet_buf_write(&req_buf, + "%s %s %s%c%s", + old_hex, new_hex, ref->name, 0, + cap_buf.buf); + cmds_sent = 1; + } else { + packet_buf_write(&req_buf, "%s %s %s", + old_hex, new_hex, ref->name); + } + } + + if (args->stateless_rpc) { + if (!args->dry_run && (cmds_sent || is_repository_shallow())) { + packet_buf_flush(&req_buf); + send_sideband(out, -1, req_buf.buf, req_buf.len, LARGE_PACKET_MAX); + } + } else { + write_or_die(out, req_buf.buf, req_buf.len); + packet_flush(out); + } + strbuf_release(&req_buf); + strbuf_release(&cap_buf); + + if (use_sideband && cmds_sent) { + memset(&demux, 0, sizeof(demux)); + demux.proc = sideband_demux; + demux.data = fd; + demux.out = -1; + if (start_async(&demux)) + die("send-pack: unable to fork off sideband demultiplexer"); + in = demux.out; + } + + if (need_pack_data && cmds_sent) { + if (pack_objects(out, remote_refs, extra_have, args) < 0) { + for (ref = remote_refs; ref; ref = ref->next) + ref->status = REF_STATUS_NONE; + if (args->stateless_rpc) + close(out); + if (git_connection_is_socket(conn)) + shutdown(fd[0], SHUT_WR); + if (use_sideband) + finish_async(&demux); + fd[1] = -1; + return -1; + } + if (!args->stateless_rpc) + /* Closed by pack_objects() via start_command() */ + fd[1] = -1; + } + if (args->stateless_rpc && cmds_sent) + packet_flush(out); + + if (status_report && cmds_sent) + ret = receive_status(in, remote_refs); + else + ret = 0; + if (args->stateless_rpc) + packet_flush(out); + + if (use_sideband && cmds_sent) { + if (finish_async(&demux)) { + error("error in sideband demultiplexer"); + ret = -1; + } + close(demux.out); + } + + if (ret < 0) + return ret; + + if (args->porcelain) + return 0; + + 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; +} |