diff options
Diffstat (limited to 'third_party/git/builtin/receive-pack.c')
| -rw-r--r-- | third_party/git/builtin/receive-pack.c | 2061 |
1 files changed, 2061 insertions, 0 deletions
diff --git a/third_party/git/builtin/receive-pack.c b/third_party/git/builtin/receive-pack.c new file mode 100644 index 0000000000..dcf385511f --- /dev/null +++ b/third_party/git/builtin/receive-pack.c @@ -0,0 +1,2061 @@ +#include "builtin.h" +#include "repository.h" +#include "config.h" +#include "lockfile.h" +#include "pack.h" +#include "refs.h" +#include "pkt-line.h" +#include "sideband.h" +#include "run-command.h" +#include "exec-cmd.h" +#include "commit.h" +#include "object.h" +#include "remote.h" +#include "connect.h" +#include "string-list.h" +#include "sha1-array.h" +#include "connected.h" +#include "argv-array.h" +#include "version.h" +#include "tag.h" +#include "gpg-interface.h" +#include "sigchain.h" +#include "fsck.h" +#include "tmp-objdir.h" +#include "oidset.h" +#include "packfile.h" +#include "object-store.h" +#include "protocol.h" +#include "commit-reach.h" + +static const char * const receive_pack_usage[] = { + N_("git receive-pack <git-dir>"), + NULL +}; + +enum deny_action { + DENY_UNCONFIGURED, + DENY_IGNORE, + DENY_WARN, + DENY_REFUSE, + DENY_UPDATE_INSTEAD +}; + +static int deny_deletes; +static int deny_non_fast_forwards; +static enum deny_action deny_current_branch = DENY_UNCONFIGURED; +static enum deny_action deny_delete_current = DENY_UNCONFIGURED; +static int receive_fsck_objects = -1; +static int transfer_fsck_objects = -1; +static struct strbuf fsck_msg_types = STRBUF_INIT; +static int receive_unpack_limit = -1; +static int transfer_unpack_limit = -1; +static int advertise_atomic_push = 1; +static int advertise_push_options; +static int unpack_limit = 100; +static off_t max_input_size; +static int report_status; +static int use_sideband; +static int use_atomic; +static int use_push_options; +static int quiet; +static int prefer_ofs_delta = 1; +static int auto_update_server_info; +static int auto_gc = 1; +static int reject_thin; +static int stateless_rpc; +static const char *service_dir; +static const char *head_name; +static void *head_name_to_free; +static int sent_capabilities; +static int shallow_update; +static const char *alt_shallow_file; +static struct strbuf push_cert = STRBUF_INIT; +static struct object_id push_cert_oid; +static struct signature_check sigcheck; +static const char *push_cert_nonce; +static const char *cert_nonce_seed; + +static const char *NONCE_UNSOLICITED = "UNSOLICITED"; +static const char *NONCE_BAD = "BAD"; +static const char *NONCE_MISSING = "MISSING"; +static const char *NONCE_OK = "OK"; +static const char *NONCE_SLOP = "SLOP"; +static const char *nonce_status; +static long nonce_stamp_slop; +static timestamp_t nonce_stamp_slop_limit; +static struct ref_transaction *transaction; + +static enum { + KEEPALIVE_NEVER = 0, + KEEPALIVE_AFTER_NUL, + KEEPALIVE_ALWAYS +} use_keepalive; +static int keepalive_in_sec = 5; + +static struct tmp_objdir *tmp_objdir; + +static enum deny_action parse_deny_action(const char *var, const char *value) +{ + if (value) { + if (!strcasecmp(value, "ignore")) + return DENY_IGNORE; + if (!strcasecmp(value, "warn")) + return DENY_WARN; + if (!strcasecmp(value, "refuse")) + return DENY_REFUSE; + if (!strcasecmp(value, "updateinstead")) + return DENY_UPDATE_INSTEAD; + } + if (git_config_bool(var, value)) + return DENY_REFUSE; + return DENY_IGNORE; +} + +static int receive_pack_config(const char *var, const char *value, void *cb) +{ + int status = parse_hide_refs_config(var, value, "receive"); + + if (status) + return status; + + if (strcmp(var, "receive.denydeletes") == 0) { + deny_deletes = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.denynonfastforwards") == 0) { + deny_non_fast_forwards = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.unpacklimit") == 0) { + receive_unpack_limit = git_config_int(var, value); + return 0; + } + + if (strcmp(var, "transfer.unpacklimit") == 0) { + transfer_unpack_limit = git_config_int(var, value); + return 0; + } + + if (strcmp(var, "receive.fsck.skiplist") == 0) { + const char *path; + + if (git_config_pathname(&path, var, value)) + return 1; + strbuf_addf(&fsck_msg_types, "%cskiplist=%s", + fsck_msg_types.len ? ',' : '=', path); + free((char *)path); + return 0; + } + + if (skip_prefix(var, "receive.fsck.", &var)) { + if (is_valid_msg_type(var, value)) + strbuf_addf(&fsck_msg_types, "%c%s=%s", + fsck_msg_types.len ? ',' : '=', var, value); + else + warning("Skipping unknown msg id '%s'", var); + return 0; + } + + if (strcmp(var, "receive.fsckobjects") == 0) { + receive_fsck_objects = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "transfer.fsckobjects") == 0) { + transfer_fsck_objects = git_config_bool(var, value); + return 0; + } + + if (!strcmp(var, "receive.denycurrentbranch")) { + deny_current_branch = parse_deny_action(var, value); + return 0; + } + + if (strcmp(var, "receive.denydeletecurrent") == 0) { + deny_delete_current = parse_deny_action(var, value); + return 0; + } + + if (strcmp(var, "repack.usedeltabaseoffset") == 0) { + prefer_ofs_delta = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.updateserverinfo") == 0) { + auto_update_server_info = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.autogc") == 0) { + auto_gc = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.shallowupdate") == 0) { + shallow_update = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.certnonceseed") == 0) + return git_config_string(&cert_nonce_seed, var, value); + + if (strcmp(var, "receive.certnonceslop") == 0) { + nonce_stamp_slop_limit = git_config_ulong(var, value); + return 0; + } + + if (strcmp(var, "receive.advertiseatomic") == 0) { + advertise_atomic_push = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.advertisepushoptions") == 0) { + advertise_push_options = git_config_bool(var, value); + return 0; + } + + if (strcmp(var, "receive.keepalive") == 0) { + keepalive_in_sec = git_config_int(var, value); + return 0; + } + + if (strcmp(var, "receive.maxinputsize") == 0) { + max_input_size = git_config_int64(var, value); + return 0; + } + + return git_default_config(var, value, cb); +} + +static void show_ref(const char *path, const struct object_id *oid) +{ + if (sent_capabilities) { + packet_write_fmt(1, "%s %s\n", oid_to_hex(oid), path); + } else { + struct strbuf cap = STRBUF_INIT; + + strbuf_addstr(&cap, + "report-status delete-refs side-band-64k quiet"); + if (advertise_atomic_push) + strbuf_addstr(&cap, " atomic"); + if (prefer_ofs_delta) + strbuf_addstr(&cap, " ofs-delta"); + if (push_cert_nonce) + strbuf_addf(&cap, " push-cert=%s", push_cert_nonce); + if (advertise_push_options) + strbuf_addstr(&cap, " push-options"); + strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized()); + packet_write_fmt(1, "%s %s%c%s\n", + oid_to_hex(oid), path, 0, cap.buf); + strbuf_release(&cap); + sent_capabilities = 1; + } +} + +static int show_ref_cb(const char *path_full, const struct object_id *oid, + int flag, void *data) +{ + struct oidset *seen = data; + const char *path = strip_namespace(path_full); + + if (ref_is_hidden(path, path_full)) + return 0; + + /* + * Advertise refs outside our current namespace as ".have" + * refs, so that the client can use them to minimize data + * transfer but will otherwise ignore them. + */ + if (!path) { + if (oidset_insert(seen, oid)) + return 0; + path = ".have"; + } else { + oidset_insert(seen, oid); + } + show_ref(path, oid); + return 0; +} + +static void show_one_alternate_ref(const struct object_id *oid, + void *data) +{ + struct oidset *seen = data; + + if (oidset_insert(seen, oid)) + return; + + show_ref(".have", oid); +} + +static void write_head_info(void) +{ + static struct oidset seen = OIDSET_INIT; + + for_each_ref(show_ref_cb, &seen); + for_each_alternate_ref(show_one_alternate_ref, &seen); + oidset_clear(&seen); + if (!sent_capabilities) + show_ref("capabilities^{}", &null_oid); + + advertise_shallow_grafts(1); + + /* EOF */ + packet_flush(1); +} + +struct command { + struct command *next; + const char *error_string; + unsigned int skip_update:1, + did_not_exist:1; + int index; + struct object_id old_oid; + struct object_id new_oid; + char ref_name[FLEX_ARRAY]; /* more */ +}; + +static void rp_error(const char *err, ...) __attribute__((format (printf, 1, 2))); +static void rp_warning(const char *err, ...) __attribute__((format (printf, 1, 2))); + +static void report_message(const char *prefix, const char *err, va_list params) +{ + int sz; + char msg[4096]; + + sz = xsnprintf(msg, sizeof(msg), "%s", prefix); + sz += vsnprintf(msg + sz, sizeof(msg) - sz, err, params); + if (sz > (sizeof(msg) - 1)) + sz = sizeof(msg) - 1; + msg[sz++] = '\n'; + + if (use_sideband) + send_sideband(1, 2, msg, sz, use_sideband); + else + xwrite(2, msg, sz); +} + +static void rp_warning(const char *err, ...) +{ + va_list params; + va_start(params, err); + report_message("warning: ", err, params); + va_end(params); +} + +static void rp_error(const char *err, ...) +{ + va_list params; + va_start(params, err); + report_message("error: ", err, params); + va_end(params); +} + +static int copy_to_sideband(int in, int out, void *arg) +{ + char data[128]; + int keepalive_active = 0; + + if (keepalive_in_sec <= 0) + use_keepalive = KEEPALIVE_NEVER; + if (use_keepalive == KEEPALIVE_ALWAYS) + keepalive_active = 1; + + while (1) { + ssize_t sz; + + if (keepalive_active) { + struct pollfd pfd; + int ret; + + pfd.fd = in; + pfd.events = POLLIN; + ret = poll(&pfd, 1, 1000 * keepalive_in_sec); + + if (ret < 0) { + if (errno == EINTR) + continue; + else + break; + } else if (ret == 0) { + /* no data; send a keepalive packet */ + static const char buf[] = "0005\1"; + write_or_die(1, buf, sizeof(buf) - 1); + continue; + } /* else there is actual data to read */ + } + + sz = xread(in, data, sizeof(data)); + if (sz <= 0) + break; + + if (use_keepalive == KEEPALIVE_AFTER_NUL && !keepalive_active) { + const char *p = memchr(data, '\0', sz); + if (p) { + /* + * The NUL tells us to start sending keepalives. Make + * sure we send any other data we read along + * with it. + */ + keepalive_active = 1; + send_sideband(1, 2, data, p - data, use_sideband); + send_sideband(1, 2, p + 1, sz - (p - data + 1), use_sideband); + continue; + } + } + + /* + * Either we're not looking for a NUL signal, or we didn't see + * it yet; just pass along the data. + */ + send_sideband(1, 2, data, sz, use_sideband); + } + close(in); + return 0; +} + +#define HMAC_BLOCK_SIZE 64 + +static void hmac_sha1(unsigned char *out, + const char *key_in, size_t key_len, + const char *text, size_t text_len) +{ + unsigned char key[HMAC_BLOCK_SIZE]; + unsigned char k_ipad[HMAC_BLOCK_SIZE]; + unsigned char k_opad[HMAC_BLOCK_SIZE]; + int i; + git_SHA_CTX ctx; + + /* RFC 2104 2. (1) */ + memset(key, '\0', HMAC_BLOCK_SIZE); + if (HMAC_BLOCK_SIZE < key_len) { + git_SHA1_Init(&ctx); + git_SHA1_Update(&ctx, key_in, key_len); + git_SHA1_Final(key, &ctx); + } else { + memcpy(key, key_in, key_len); + } + + /* RFC 2104 2. (2) & (5) */ + for (i = 0; i < sizeof(key); i++) { + k_ipad[i] = key[i] ^ 0x36; + k_opad[i] = key[i] ^ 0x5c; + } + + /* RFC 2104 2. (3) & (4) */ + git_SHA1_Init(&ctx); + git_SHA1_Update(&ctx, k_ipad, sizeof(k_ipad)); + git_SHA1_Update(&ctx, text, text_len); + git_SHA1_Final(out, &ctx); + + /* RFC 2104 2. (6) & (7) */ + git_SHA1_Init(&ctx); + git_SHA1_Update(&ctx, k_opad, sizeof(k_opad)); + git_SHA1_Update(&ctx, out, GIT_SHA1_RAWSZ); + git_SHA1_Final(out, &ctx); +} + +static char *prepare_push_cert_nonce(const char *path, timestamp_t stamp) +{ + struct strbuf buf = STRBUF_INIT; + unsigned char sha1[GIT_SHA1_RAWSZ]; + + strbuf_addf(&buf, "%s:%"PRItime, path, stamp); + hmac_sha1(sha1, buf.buf, buf.len, cert_nonce_seed, strlen(cert_nonce_seed)); + strbuf_release(&buf); + + /* RFC 2104 5. HMAC-SHA1-80 */ + strbuf_addf(&buf, "%"PRItime"-%.*s", stamp, GIT_SHA1_HEXSZ, sha1_to_hex(sha1)); + return strbuf_detach(&buf, NULL); +} + +/* + * NEEDSWORK: reuse find_commit_header() from jk/commit-author-parsing + * after dropping "_commit" from its name and possibly moving it out + * of commit.c + */ +static char *find_header(const char *msg, size_t len, const char *key, + const char **next_line) +{ + int key_len = strlen(key); + const char *line = msg; + + while (line && line < msg + len) { + const char *eol = strchrnul(line, '\n'); + + if ((msg + len <= eol) || line == eol) + return NULL; + if (line + key_len < eol && + !memcmp(line, key, key_len) && line[key_len] == ' ') { + int offset = key_len + 1; + if (next_line) + *next_line = *eol ? eol + 1 : eol; + return xmemdupz(line + offset, (eol - line) - offset); + } + line = *eol ? eol + 1 : NULL; + } + return NULL; +} + +static const char *check_nonce(const char *buf, size_t len) +{ + char *nonce = find_header(buf, len, "nonce", NULL); + timestamp_t stamp, ostamp; + char *bohmac, *expect = NULL; + const char *retval = NONCE_BAD; + + if (!nonce) { + retval = NONCE_MISSING; + goto leave; + } else if (!push_cert_nonce) { + retval = NONCE_UNSOLICITED; + goto leave; + } else if (!strcmp(push_cert_nonce, nonce)) { + retval = NONCE_OK; + goto leave; + } + + if (!stateless_rpc) { + /* returned nonce MUST match what we gave out earlier */ + retval = NONCE_BAD; + goto leave; + } + + /* + * In stateless mode, we may be receiving a nonce issued by + * another instance of the server that serving the same + * repository, and the timestamps may not match, but the + * nonce-seed and dir should match, so we can recompute and + * report the time slop. + * + * In addition, when a nonce issued by another instance has + * timestamp within receive.certnonceslop seconds, we pretend + * as if we issued that nonce when reporting to the hook. + */ + + /* nonce is concat(<seconds-since-epoch>, "-", <hmac>) */ + if (*nonce <= '0' || '9' < *nonce) { + retval = NONCE_BAD; + goto leave; + } + stamp = parse_timestamp(nonce, &bohmac, 10); + if (bohmac == nonce || bohmac[0] != '-') { + retval = NONCE_BAD; + goto leave; + } + + expect = prepare_push_cert_nonce(service_dir, stamp); + if (strcmp(expect, nonce)) { + /* Not what we would have signed earlier */ + retval = NONCE_BAD; + goto leave; + } + + /* + * By how many seconds is this nonce stale? Negative value + * would mean it was issued by another server with its clock + * skewed in the future. + */ + ostamp = parse_timestamp(push_cert_nonce, NULL, 10); + nonce_stamp_slop = (long)ostamp - (long)stamp; + + if (nonce_stamp_slop_limit && + labs(nonce_stamp_slop) <= nonce_stamp_slop_limit) { + /* + * Pretend as if the received nonce (which passes the + * HMAC check, so it is not a forged by third-party) + * is what we issued. + */ + free((void *)push_cert_nonce); + push_cert_nonce = xstrdup(nonce); + retval = NONCE_OK; + } else { + retval = NONCE_SLOP; + } + +leave: + free(nonce); + free(expect); + return retval; +} + +/* + * Return 1 if there is no push_cert or if the push options in push_cert are + * the same as those in the argument; 0 otherwise. + */ +static int check_cert_push_options(const struct string_list *push_options) +{ + const char *buf = push_cert.buf; + int len = push_cert.len; + + char *option; + const char *next_line; + int options_seen = 0; + + int retval = 1; + + if (!len) + return 1; + + while ((option = find_header(buf, len, "push-option", &next_line))) { + len -= (next_line - buf); + buf = next_line; + options_seen++; + if (options_seen > push_options->nr + || strcmp(option, + push_options->items[options_seen - 1].string)) { + retval = 0; + goto leave; + } + free(option); + } + + if (options_seen != push_options->nr) + retval = 0; + +leave: + free(option); + return retval; +} + +static void prepare_push_cert_sha1(struct child_process *proc) +{ + static int already_done; + + if (!push_cert.len) + return; + + if (!already_done) { + int bogs /* beginning_of_gpg_sig */; + + already_done = 1; + if (write_object_file(push_cert.buf, push_cert.len, "blob", + &push_cert_oid)) + oidclr(&push_cert_oid); + + memset(&sigcheck, '\0', sizeof(sigcheck)); + + bogs = parse_signature(push_cert.buf, push_cert.len); + check_signature(push_cert.buf, bogs, push_cert.buf + bogs, + push_cert.len - bogs, &sigcheck); + + nonce_status = check_nonce(push_cert.buf, bogs); + } + if (!is_null_oid(&push_cert_oid)) { + argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT=%s", + oid_to_hex(&push_cert_oid)); + argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_SIGNER=%s", + sigcheck.signer ? sigcheck.signer : ""); + argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_KEY=%s", + sigcheck.key ? sigcheck.key : ""); + argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT_STATUS=%c", + sigcheck.result); + if (push_cert_nonce) { + argv_array_pushf(&proc->env_array, + "GIT_PUSH_CERT_NONCE=%s", + push_cert_nonce); + argv_array_pushf(&proc->env_array, + "GIT_PUSH_CERT_NONCE_STATUS=%s", + nonce_status); + if (nonce_status == NONCE_SLOP) + argv_array_pushf(&proc->env_array, + "GIT_PUSH_CERT_NONCE_SLOP=%ld", + nonce_stamp_slop); + } + } +} + +struct receive_hook_feed_state { + struct command *cmd; + int skip_broken; + struct strbuf buf; + const struct string_list *push_options; +}; + +typedef int (*feed_fn)(void *, const char **, size_t *); +static int run_and_feed_hook(const char *hook_name, feed_fn feed, + struct receive_hook_feed_state *feed_state) +{ + struct child_process proc = CHILD_PROCESS_INIT; + struct async muxer; + const char *argv[2]; + int code; + + argv[0] = find_hook(hook_name); + if (!argv[0]) + return 0; + + argv[1] = NULL; + + proc.argv = argv; + proc.in = -1; + proc.stdout_to_stderr = 1; + proc.trace2_hook_name = hook_name; + + if (feed_state->push_options) { + int i; + for (i = 0; i < feed_state->push_options->nr; i++) + argv_array_pushf(&proc.env_array, + "GIT_PUSH_OPTION_%d=%s", i, + feed_state->push_options->items[i].string); + argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT=%d", + feed_state->push_options->nr); + } else + argv_array_pushf(&proc.env_array, "GIT_PUSH_OPTION_COUNT"); + + if (tmp_objdir) + argv_array_pushv(&proc.env_array, tmp_objdir_env(tmp_objdir)); + + if (use_sideband) { + memset(&muxer, 0, sizeof(muxer)); + muxer.proc = copy_to_sideband; + muxer.in = -1; + code = start_async(&muxer); + if (code) + return code; + proc.err = muxer.in; + } + + prepare_push_cert_sha1(&proc); + + code = start_command(&proc); + if (code) { + if (use_sideband) + finish_async(&muxer); + return code; + } + + sigchain_push(SIGPIPE, SIG_IGN); + + while (1) { + const char *buf; + size_t n; + if (feed(feed_state, &buf, &n)) + break; + if (write_in_full(proc.in, buf, n) < 0) + break; + } + close(proc.in); + if (use_sideband) + finish_async(&muxer); + + sigchain_pop(SIGPIPE); + + return finish_command(&proc); +} + +static int feed_receive_hook(void *state_, const char **bufp, size_t *sizep) +{ + struct receive_hook_feed_state *state = state_; + struct command *cmd = state->cmd; + + while (cmd && + state->skip_broken && (cmd->error_string || cmd->did_not_exist)) + cmd = cmd->next; + if (!cmd) + return -1; /* EOF */ + strbuf_reset(&state->buf); + strbuf_addf(&state->buf, "%s %s %s\n", + oid_to_hex(&cmd->old_oid), oid_to_hex(&cmd->new_oid), + cmd->ref_name); + state->cmd = cmd->next; + if (bufp) { + *bufp = state->buf.buf; + *sizep = state->buf.len; + } + return 0; +} + +static int run_receive_hook(struct command *commands, + const char *hook_name, + int skip_broken, + const struct string_list *push_options) +{ + struct receive_hook_feed_state state; + int status; + + strbuf_init(&state.buf, 0); + state.cmd = commands; + state.skip_broken = skip_broken; + if (feed_receive_hook(&state, NULL, NULL)) + return 0; + state.cmd = commands; + state.push_options = push_options; + status = run_and_feed_hook(hook_name, feed_receive_hook, &state); + strbuf_release(&state.buf); + return status; +} + +static int run_update_hook(struct command *cmd) +{ + const char *argv[5]; + struct child_process proc = CHILD_PROCESS_INIT; + int code; + + argv[0] = find_hook("update"); + if (!argv[0]) + return 0; + + argv[1] = cmd->ref_name; + argv[2] = oid_to_hex(&cmd->old_oid); + argv[3] = oid_to_hex(&cmd->new_oid); + argv[4] = NULL; + + proc.no_stdin = 1; + proc.stdout_to_stderr = 1; + proc.err = use_sideband ? -1 : 0; + proc.argv = argv; + proc.trace2_hook_name = "update"; + + code = start_command(&proc); + if (code) + return code; + if (use_sideband) + copy_to_sideband(proc.err, -1, NULL); + return finish_command(&proc); +} + +static int is_ref_checked_out(const char *ref) +{ + if (is_bare_repository()) + return 0; + + if (!head_name) + return 0; + return !strcmp(head_name, ref); +} + +static char *refuse_unconfigured_deny_msg = + N_("By default, updating the current branch in a non-bare repository\n" + "is denied, because it will make the index and work tree inconsistent\n" + "with what you pushed, and will require 'git reset --hard' to match\n" + "the work tree to HEAD.\n" + "\n" + "You can set the 'receive.denyCurrentBranch' configuration variable\n" + "to 'ignore' or 'warn' in the remote repository to allow pushing into\n" + "its current branch; however, this is not recommended unless you\n" + "arranged to update its work tree to match what you pushed in some\n" + "other way.\n" + "\n" + "To squelch this message and still keep the default behaviour, set\n" + "'receive.denyCurrentBranch' configuration variable to 'refuse'."); + +static void refuse_unconfigured_deny(void) +{ + rp_error("%s", _(refuse_unconfigured_deny_msg)); +} + +static char *refuse_unconfigured_deny_delete_current_msg = + N_("By default, deleting the current branch is denied, because the next\n" + "'git clone' won't result in any file checked out, causing confusion.\n" + "\n" + "You can set 'receive.denyDeleteCurrent' configuration variable to\n" + "'warn' or 'ignore' in the remote repository to allow deleting the\n" + "current branch, with or without a warning message.\n" + "\n" + "To squelch this message, you can set it to 'refuse'."); + +static void refuse_unconfigured_deny_delete_current(void) +{ + rp_error("%s", _(refuse_unconfigured_deny_delete_current_msg)); +} + +static int command_singleton_iterator(void *cb_data, struct object_id *oid); +static int update_shallow_ref(struct command *cmd, struct shallow_info *si) +{ + struct lock_file shallow_lock = LOCK_INIT; + struct oid_array extra = OID_ARRAY_INIT; + struct check_connected_options opt = CHECK_CONNECTED_INIT; + uint32_t mask = 1 << (cmd->index % 32); + int i; + + trace_printf_key(&trace_shallow, + "shallow: update_shallow_ref %s\n", cmd->ref_name); + for (i = 0; i < si->shallow->nr; i++) + if (si->used_shallow[i] && + (si->used_shallow[i][cmd->index / 32] & mask) && + !delayed_reachability_test(si, i)) + oid_array_append(&extra, &si->shallow->oid[i]); + + opt.env = tmp_objdir_env(tmp_objdir); + setup_alternate_shallow(&shallow_lock, &opt.shallow_file, &extra); + if (check_connected(command_singleton_iterator, cmd, &opt)) { + rollback_lock_file(&shallow_lock); + oid_array_clear(&extra); + return -1; + } + + commit_lock_file(&shallow_lock); + + /* + * Make sure setup_alternate_shallow() for the next ref does + * not lose these new roots.. + */ + for (i = 0; i < extra.nr; i++) + register_shallow(the_repository, &extra.oid[i]); + + si->shallow_ref[cmd->index] = 0; + oid_array_clear(&extra); + return 0; +} + +/* + * NEEDSWORK: we should consolidate various implementions of "are we + * on an unborn branch?" test into one, and make the unified one more + * robust. !get_sha1() based check used here and elsewhere would not + * allow us to tell an unborn branch from corrupt ref, for example. + * For the purpose of fixing "deploy-to-update does not work when + * pushing into an empty repository" issue, this should suffice for + * now. + */ +static int head_has_history(void) +{ + struct object_id oid; + + return !get_oid("HEAD", &oid); +} + +static const char *push_to_deploy(unsigned char *sha1, + struct argv_array *env, + const char *work_tree) +{ + const char *update_refresh[] = { + "update-index", "-q", "--ignore-submodules", "--refresh", NULL + }; + const char *diff_files[] = { + "diff-files", "--quiet", "--ignore-submodules", "--", NULL + }; + const char *diff_index[] = { + "diff-index", "--quiet", "--cached", "--ignore-submodules", + NULL, "--", NULL + }; + const char *read_tree[] = { + "read-tree", "-u", "-m", NULL, NULL + }; + struct child_process child = CHILD_PROCESS_INIT; + + child.argv = update_refresh; + child.env = env->argv; + child.dir = work_tree; + child.no_stdin = 1; + child.stdout_to_stderr = 1; + child.git_cmd = 1; + if (run_command(&child)) + return "Up-to-date check failed"; + + /* run_command() does not clean up completely; reinitialize */ + child_process_init(&child); + child.argv = diff_files; + child.env = env->argv; + child.dir = work_tree; + child.no_stdin = 1; + child.stdout_to_stderr = 1; + child.git_cmd = 1; + if (run_command(&child)) + return "Working directory has unstaged changes"; + + /* diff-index with either HEAD or an empty tree */ + diff_index[4] = head_has_history() ? "HEAD" : empty_tree_oid_hex(); + + child_process_init(&child); + child.argv = diff_index; + child.env = env->argv; + child.no_stdin = 1; + child.no_stdout = 1; + child.stdout_to_stderr = 0; + child.git_cmd = 1; + if (run_command(&child)) + return "Working directory has staged changes"; + + read_tree[3] = sha1_to_hex(sha1); + child_process_init(&child); + child.argv = read_tree; + child.env = env->argv; + child.dir = work_tree; + child.no_stdin = 1; + child.no_stdout = 1; + child.stdout_to_stderr = 0; + child.git_cmd = 1; + if (run_command(&child)) + return "Could not update working tree to new HEAD"; + + return NULL; +} + +static const char *push_to_checkout_hook = "push-to-checkout"; + +static const char *push_to_checkout(unsigned char *sha1, + struct argv_array *env, + const char *work_tree) +{ + argv_array_pushf(env, "GIT_WORK_TREE=%s", absolute_path(work_tree)); + if (run_hook_le(env->argv, push_to_checkout_hook, + sha1_to_hex(sha1), NULL)) + return "push-to-checkout hook declined"; + else + return NULL; +} + +static const char *update_worktree(unsigned char *sha1) +{ + const char *retval; + const char *work_tree = git_work_tree_cfg ? git_work_tree_cfg : ".."; + struct argv_array env = ARGV_ARRAY_INIT; + + if (is_bare_repository()) + return "denyCurrentBranch = updateInstead needs a worktree"; + + argv_array_pushf(&env, "GIT_DIR=%s", absolute_path(get_git_dir())); + + if (!find_hook(push_to_checkout_hook)) + retval = push_to_deploy(sha1, &env, work_tree); + else + retval = push_to_checkout(sha1, &env, work_tree); + + argv_array_clear(&env); + return retval; +} + +static const char *update(struct command *cmd, struct shallow_info *si) +{ + const char *name = cmd->ref_name; + struct strbuf namespaced_name_buf = STRBUF_INIT; + static char *namespaced_name; + const char *ret; + struct object_id *old_oid = &cmd->old_oid; + struct object_id *new_oid = &cmd->new_oid; + int do_update_worktree = 0; + + /* only refs/... are allowed */ + if (!starts_with(name, "refs/") || check_refname_format(name + 5, 0)) { + rp_error("refusing to create funny ref '%s' remotely", name); + return "funny refname"; + } + + strbuf_addf(&namespaced_name_buf, "%s%s", get_git_namespace(), name); + free(namespaced_name); + namespaced_name = strbuf_detach(&namespaced_name_buf, NULL); + + if (is_ref_checked_out(namespaced_name)) { + switch (deny_current_branch) { + case DENY_IGNORE: + break; + case DENY_WARN: + rp_warning("updating the current branch"); + break; + case DENY_REFUSE: + case DENY_UNCONFIGURED: + rp_error("refusing to update checked out branch: %s", name); + if (deny_current_branch == DENY_UNCONFIGURED) + refuse_unconfigured_deny(); + return "branch is currently checked out"; + case DENY_UPDATE_INSTEAD: + /* pass -- let other checks intervene first */ + do_update_worktree = 1; + break; + } + } + + if (!is_null_oid(new_oid) && !has_object_file(new_oid)) { + error("unpack should have generated %s, " + "but I can't find it!", oid_to_hex(new_oid)); + return "bad pack"; + } + + if (!is_null_oid(old_oid) && is_null_oid(new_oid)) { + if (deny_deletes && starts_with(name, "refs/heads/")) { + rp_error("denying ref deletion for %s", name); + return "deletion prohibited"; + } + + if (head_name && !strcmp(namespaced_name, head_name)) { + switch (deny_delete_current) { + case DENY_IGNORE: + break; + case DENY_WARN: + rp_warning("deleting the current branch"); + break; + case DENY_REFUSE: + case DENY_UNCONFIGURED: + case DENY_UPDATE_INSTEAD: + if (deny_delete_current == DENY_UNCONFIGURED) + refuse_unconfigured_deny_delete_current(); + rp_error("refusing to delete the current branch: %s", name); + return "deletion of the current branch prohibited"; + default: + return "Invalid denyDeleteCurrent setting"; + } + } + } + + if (deny_non_fast_forwards && !is_null_oid(new_oid) && + !is_null_oid(old_oid) && + starts_with(name, "refs/heads/")) { + struct object *old_object, *new_object; + struct commit *old_commit, *new_commit; + + old_object = parse_object(the_repository, old_oid); + new_object = parse_object(the_repository, new_oid); + + if (!old_object || !new_object || + old_object->type != OBJ_COMMIT || + new_object->type != OBJ_COMMIT) { + error("bad sha1 objects for %s", name); + return "bad ref"; + } + old_commit = (struct commit *)old_object; + new_commit = (struct commit *)new_object; + if (!in_merge_bases(old_commit, new_commit)) { + rp_error("denying non-fast-forward %s" + " (you should pull first)", name); + return "non-fast-forward"; + } + } + if (run_update_hook(cmd)) { + rp_error("hook declined to update %s", name); + return "hook declined"; + } + + if (do_update_worktree) { + ret = update_worktree(new_oid->hash); + if (ret) + return ret; + } + + if (is_null_oid(new_oid)) { + struct strbuf err = STRBUF_INIT; + if (!parse_object(the_repository, old_oid)) { + old_oid = NULL; + if (ref_exists(name)) { + rp_warning("Allowing deletion of corrupt ref."); + } else { + rp_warning("Deleting a non-existent ref."); + cmd->did_not_exist = 1; + } + } + if (ref_transaction_delete(transaction, + namespaced_name, + old_oid, + 0, "push", &err)) { + rp_error("%s", err.buf); + strbuf_release(&err); + return "failed to delete"; + } + strbuf_release(&err); + return NULL; /* good */ + } + else { + struct strbuf err = STRBUF_INIT; + if (shallow_update && si->shallow_ref[cmd->index] && + update_shallow_ref(cmd, si)) + return "shallow error"; + + if (ref_transaction_update(transaction, + namespaced_name, + new_oid, old_oid, + 0, "push", + &err)) { + rp_error("%s", err.buf); + strbuf_release(&err); + + return "failed to update ref"; + } + strbuf_release(&err); + + return NULL; /* good */ + } +} + +static void run_update_post_hook(struct command *commands) +{ + struct command *cmd; + struct child_process proc = CHILD_PROCESS_INIT; + const char *hook; + + hook = find_hook("post-update"); + if (!hook) + return; + + for (cmd = commands; cmd; cmd = cmd->next) { + if (cmd->error_string || cmd->did_not_exist) + continue; + if (!proc.args.argc) + argv_array_push(&proc.args, hook); + argv_array_push(&proc.args, cmd->ref_name); + } + if (!proc.args.argc) + return; + + proc.no_stdin = 1; + proc.stdout_to_stderr = 1; + proc.err = use_sideband ? -1 : 0; + proc.trace2_hook_name = "post-update"; + + if (!start_command(&proc)) { + if (use_sideband) + copy_to_sideband(proc.err, -1, NULL); + finish_command(&proc); + } +} + +static void check_aliased_update_internal(struct command *cmd, + struct string_list *list, + const char *dst_name, int flag) +{ + struct string_list_item *item; + struct command *dst_cmd; + + if (!(flag & REF_ISSYMREF)) + return; + + if (!dst_name) { + rp_error("refusing update to broken symref '%s'", cmd->ref_name); + cmd->skip_update = 1; + cmd->error_string = "broken symref"; + return; + } + dst_name = strip_namespace(dst_name); + + if ((item = string_list_lookup(list, dst_name)) == NULL) + return; + + cmd->skip_update = 1; + + dst_cmd = (struct command *) item->util; + + if (oideq(&cmd->old_oid, &dst_cmd->old_oid) && + oideq(&cmd->new_oid, &dst_cmd->new_oid)) + return; + + dst_cmd->skip_update = 1; + + rp_error("refusing inconsistent update between symref '%s' (%s..%s) and" + " its target '%s' (%s..%s)", + cmd->ref_name, + find_unique_abbrev(&cmd->old_oid, DEFAULT_ABBREV), + find_unique_abbrev(&cmd->new_oid, DEFAULT_ABBREV), + dst_cmd->ref_name, + find_unique_abbrev(&dst_cmd->old_oid, DEFAULT_ABBREV), + find_unique_abbrev(&dst_cmd->new_oid, DEFAULT_ABBREV)); + + cmd->error_string = dst_cmd->error_string = + "inconsistent aliased update"; +} + +static void check_aliased_update(struct command *cmd, struct string_list *list) +{ + struct strbuf buf = STRBUF_INIT; + const char *dst_name; + int flag; + + strbuf_addf(&buf, "%s%s", get_git_namespace(), cmd->ref_name); + dst_name = resolve_ref_unsafe(buf.buf, 0, NULL, &flag); + check_aliased_update_internal(cmd, list, dst_name, flag); + strbuf_release(&buf); +} + +static void check_aliased_updates(struct command *commands) +{ + struct command *cmd; + struct string_list ref_list = STRING_LIST_INIT_NODUP; + + for (cmd = commands; cmd; cmd = cmd->next) { + struct string_list_item *item = + string_list_append(&ref_list, cmd->ref_name); + item->util = (void *)cmd; + } + string_list_sort(&ref_list); + + for (cmd = commands; cmd; cmd = cmd->next) { + if (!cmd->error_string) + check_aliased_update(cmd, &ref_list); + } + + string_list_clear(&ref_list, 0); +} + +static int command_singleton_iterator(void *cb_data, struct object_id *oid) +{ + struct command **cmd_list = cb_data; + struct command *cmd = *cmd_list; + + if (!cmd || is_null_oid(&cmd->new_oid)) + return -1; /* end of list */ + *cmd_list = NULL; /* this returns only one */ + oidcpy(oid, &cmd->new_oid); + return 0; +} + +static void set_connectivity_errors(struct command *commands, + struct shallow_info *si) +{ + struct command *cmd; + + for (cmd = commands; cmd; cmd = cmd->next) { + struct command *singleton = cmd; + struct check_connected_options opt = CHECK_CONNECTED_INIT; + + if (shallow_update && si->shallow_ref[cmd->index]) + /* to be checked in update_shallow_ref() */ + continue; + + opt.env = tmp_objdir_env(tmp_objdir); + if (!check_connected(command_singleton_iterator, &singleton, + &opt)) + continue; + + cmd->error_string = "missing necessary objects"; + } +} + +struct iterate_data { + struct command *cmds; + struct shallow_info *si; +}; + +static int iterate_receive_command_list(void *cb_data, struct object_id *oid) +{ + struct iterate_data *data = cb_data; + struct command **cmd_list = &data->cmds; + struct command *cmd = *cmd_list; + + for (; cmd; cmd = cmd->next) { + if (shallow_update && data->si->shallow_ref[cmd->index]) + /* to be checked in update_shallow_ref() */ + continue; + if (!is_null_oid(&cmd->new_oid) && !cmd->skip_update) { + oidcpy(oid, &cmd->new_oid); + *cmd_list = cmd->next; + return 0; + } + } + *cmd_list = NULL; + return -1; /* end of list */ +} + +static void reject_updates_to_hidden(struct command *commands) +{ + struct strbuf refname_full = STRBUF_INIT; + size_t prefix_len; + struct command *cmd; + + strbuf_addstr(&refname_full, get_git_namespace()); + prefix_len = refname_full.len; + + for (cmd = commands; cmd; cmd = cmd->next) { + if (cmd->error_string) + continue; + + strbuf_setlen(&refname_full, prefix_len); + strbuf_addstr(&refname_full, cmd->ref_name); + + if (!ref_is_hidden(cmd->ref_name, refname_full.buf)) + continue; + if (is_null_oid(&cmd->new_oid)) + cmd->error_string = "deny deleting a hidden ref"; + else + cmd->error_string = "deny updating a hidden ref"; + } + + strbuf_release(&refname_full); +} + +static int should_process_cmd(struct command *cmd) +{ + return !cmd->error_string && !cmd->skip_update; +} + +static void warn_if_skipped_connectivity_check(struct command *commands, + struct shallow_info *si) +{ + struct command *cmd; + int checked_connectivity = 1; + + for (cmd = commands; cmd; cmd = cmd->next) { + if (should_process_cmd(cmd) && si->shallow_ref[cmd->index]) { + error("BUG: connectivity check has not been run on ref %s", + cmd->ref_name); + checked_connectivity = 0; + } + } + if (!checked_connectivity) + BUG("connectivity check skipped???"); +} + +static void execute_commands_non_atomic(struct command *commands, + struct shallow_info *si) +{ + struct command *cmd; + struct strbuf err = STRBUF_INIT; + + for (cmd = commands; cmd; cmd = cmd->next) { + if (!should_process_cmd(cmd)) + continue; + + transaction = ref_transaction_begin(&err); + if (!transaction) { + rp_error("%s", err.buf); + strbuf_reset(&err); + cmd->error_string = "transaction failed to start"; + continue; + } + + cmd->error_string = update(cmd, si); + + if (!cmd->error_string + && ref_transaction_commit(transaction, &err)) { + rp_error("%s", err.buf); + strbuf_reset(&err); + cmd->error_string = "failed to update ref"; + } + ref_transaction_free(transaction); + } + strbuf_release(&err); +} + +static void execute_commands_atomic(struct command *commands, + struct shallow_info *si) +{ + struct command *cmd; + struct strbuf err = STRBUF_INIT; + const char *reported_error = "atomic push failure"; + + transaction = ref_transaction_begin(&err); + if (!transaction) { + rp_error("%s", err.buf); + strbuf_reset(&err); + reported_error = "transaction failed to start"; + goto failure; + } + + for (cmd = commands; cmd; cmd = cmd->next) { + if (!should_process_cmd(cmd)) + continue; + + cmd->error_string = update(cmd, si); + + if (cmd->error_string) + goto failure; + } + + if (ref_transaction_commit(transaction, &err)) { + rp_error("%s", err.buf); + reported_error = "atomic transaction failed"; + goto failure; + } + goto cleanup; + +failure: + for (cmd = commands; cmd; cmd = cmd->next) + if (!cmd->error_string) + cmd->error_string = reported_error; + +cleanup: + ref_transaction_free(transaction); + strbuf_release(&err); +} + +static void execute_commands(struct command *commands, + const char *unpacker_error, + struct shallow_info *si, + const struct string_list *push_options) +{ + struct check_connected_options opt = CHECK_CONNECTED_INIT; + struct command *cmd; + struct iterate_data data; + struct async muxer; + int err_fd = 0; + + if (unpacker_error) { + for (cmd = commands; cmd; cmd = cmd->next) + cmd->error_string = "unpacker error"; + return; + } + + if (use_sideband) { + memset(&muxer, 0, sizeof(muxer)); + muxer.proc = copy_to_sideband; + muxer.in = -1; + if (!start_async(&muxer)) + err_fd = muxer.in; + /* ...else, continue without relaying sideband */ + } + + data.cmds = commands; + data.si = si; + opt.err_fd = err_fd; + opt.progress = err_fd && !quiet; + opt.env = tmp_objdir_env(tmp_objdir); + if (check_connected(iterate_receive_command_list, &data, &opt)) + set_connectivity_errors(commands, si); + + if (use_sideband) + finish_async(&muxer); + + reject_updates_to_hidden(commands); + + if (run_receive_hook(commands, "pre-receive", 0, push_options)) { + for (cmd = commands; cmd; cmd = cmd->next) { + if (!cmd->error_string) + cmd->error_string = "pre-receive hook declined"; + } + return; + } + + /* + * Now we'll start writing out refs, which means the objects need + * to be in their final positions so that other processes can see them. + */ + if (tmp_objdir_migrate(tmp_objdir) < 0) { + for (cmd = commands; cmd; cmd = cmd->next) { + if (!cmd->error_string) + cmd->error_string = "unable to migrate objects to permanent storage"; + } + return; + } + tmp_objdir = NULL; + + check_aliased_updates(commands); + + free(head_name_to_free); + head_name = head_name_to_free = resolve_refdup("HEAD", 0, NULL, NULL); + + if (use_atomic) + execute_commands_atomic(commands, si); + else + execute_commands_non_atomic(commands, si); + + if (shallow_update) + warn_if_skipped_connectivity_check(commands, si); +} + +static struct command **queue_command(struct command **tail, + const char *line, + int linelen) +{ + struct object_id old_oid, new_oid; + struct command *cmd; + const char *refname; + int reflen; + const char *p; + + if (parse_oid_hex(line, &old_oid, &p) || + *p++ != ' ' || + parse_oid_hex(p, &new_oid, &p) || + *p++ != ' ') + die("protocol error: expected old/new/ref, got '%s'", line); + + refname = p; + reflen = linelen - (p - line); + FLEX_ALLOC_MEM(cmd, ref_name, refname, reflen); + oidcpy(&cmd->old_oid, &old_oid); + oidcpy(&cmd->new_oid, &new_oid); + *tail = cmd; + return &cmd->next; +} + +static void queue_commands_from_cert(struct command **tail, + struct strbuf *push_cert) +{ + const char *boc, *eoc; + + if (*tail) + die("protocol error: got both push certificate and unsigned commands"); + + boc = strstr(push_cert->buf, "\n\n"); + if (!boc) + die("malformed push certificate %.*s", 100, push_cert->buf); + else + boc += 2; + eoc = push_cert->buf + parse_signature(push_cert->buf, push_cert->len); + + while (boc < eoc) { + const char *eol = memchr(boc, '\n', eoc - boc); + tail = queue_command(tail, boc, eol ? eol - boc : eoc - boc); + boc = eol ? eol + 1 : eoc; + } +} + +static struct command *read_head_info(struct packet_reader *reader, + struct oid_array *shallow) +{ + struct command *commands = NULL; + struct command **p = &commands; + for (;;) { + int linelen; + + if (packet_reader_read(reader) != PACKET_READ_NORMAL) + break; + + if (reader->pktlen > 8 && starts_with(reader->line, "shallow ")) { + struct object_id oid; + if (get_oid_hex(reader->line + 8, &oid)) + die("protocol error: expected shallow sha, got '%s'", + reader->line + 8); + oid_array_append(shallow, &oid); + continue; + } + + linelen = strlen(reader->line); + if (linelen < reader->pktlen) { + const char *feature_list = reader->line + linelen + 1; + if (parse_feature_request(feature_list, "report-status")) + report_status = 1; + if (parse_feature_request(feature_list, "side-band-64k")) + use_sideband = LARGE_PACKET_MAX; + if (parse_feature_request(feature_list, "quiet")) + quiet = 1; + if (advertise_atomic_push + && parse_feature_request(feature_list, "atomic")) + use_atomic = 1; + if (advertise_push_options + && parse_feature_request(feature_list, "push-options")) + use_push_options = 1; + } + + if (!strcmp(reader->line, "push-cert")) { + int true_flush = 0; + int saved_options = reader->options; + reader->options &= ~PACKET_READ_CHOMP_NEWLINE; + + for (;;) { + packet_reader_read(reader); + if (reader->status == PACKET_READ_FLUSH) { + true_flush = 1; + break; + } + if (reader->status != PACKET_READ_NORMAL) { + die("protocol error: got an unexpected packet"); + } + if (!strcmp(reader->line, "push-cert-end\n")) + break; /* end of cert */ + strbuf_addstr(&push_cert, reader->line); + } + reader->options = saved_options; + + if (true_flush) + break; + continue; + } + + p = queue_command(p, reader->line, linelen); + } + + if (push_cert.len) + queue_commands_from_cert(p, &push_cert); + + return commands; +} + +static void read_push_options(struct packet_reader *reader, + struct string_list *options) +{ + while (1) { + if (packet_reader_read(reader) != PACKET_READ_NORMAL) + break; + + string_list_append(options, reader->line); + } +} + +static const char *parse_pack_header(struct pack_header *hdr) +{ + switch (read_pack_header(0, hdr)) { + case PH_ERROR_EOF: + return "eof before pack header was fully read"; + + case PH_ERROR_PACK_SIGNATURE: + return "protocol error (pack signature mismatch detected)"; + + case PH_ERROR_PROTOCOL: + return "protocol error (pack version unsupported)"; + + default: + return "unknown error in parse_pack_header"; + + case 0: + return NULL; + } +} + +static const char *pack_lockfile; + +static void push_header_arg(struct argv_array *args, struct pack_header *hdr) +{ + argv_array_pushf(args, "--pack_header=%"PRIu32",%"PRIu32, + ntohl(hdr->hdr_version), ntohl(hdr->hdr_entries)); +} + +static const char *unpack(int err_fd, struct shallow_info *si) +{ + struct pack_header hdr; + const char *hdr_err; + int status; + struct child_process child = CHILD_PROCESS_INIT; + int fsck_objects = (receive_fsck_objects >= 0 + ? receive_fsck_objects + : transfer_fsck_objects >= 0 + ? transfer_fsck_objects + : 0); + + hdr_err = parse_pack_header(&hdr); + if (hdr_err) { + if (err_fd > 0) + close(err_fd); + return hdr_err; + } + + if (si->nr_ours || si->nr_theirs) { + alt_shallow_file = setup_temporary_shallow(si->shallow); + argv_array_push(&child.args, "--shallow-file"); + argv_array_push(&child.args, alt_shallow_file); + } + + tmp_objdir = tmp_objdir_create(); + if (!tmp_objdir) { + if (err_fd > 0) + close(err_fd); + return "unable to create temporary object directory"; + } + child.env = tmp_objdir_env(tmp_objdir); + + /* + * Normally we just pass the tmp_objdir environment to the child + * processes that do the heavy lifting, but we may need to see these + * objects ourselves to set up shallow information. + */ + tmp_objdir_add_as_alternate(tmp_objdir); + + if (ntohl(hdr.hdr_entries) < unpack_limit) { + argv_array_push(&child.args, "unpack-objects"); + push_header_arg(&child.args, &hdr); + if (quiet) + argv_array_push(&child.args, "-q"); + if (fsck_objects) + argv_array_pushf(&child.args, "--strict%s", + fsck_msg_types.buf); + if (max_input_size) + argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX, + (uintmax_t)max_input_size); + child.no_stdout = 1; + child.err = err_fd; + child.git_cmd = 1; + status = run_command(&child); + if (status) + return "unpack-objects abnormal exit"; + } else { + char hostname[HOST_NAME_MAX + 1]; + + argv_array_pushl(&child.args, "index-pack", "--stdin", NULL); + push_header_arg(&child.args, &hdr); + + if (xgethostname(hostname, sizeof(hostname))) + xsnprintf(hostname, sizeof(hostname), "localhost"); + argv_array_pushf(&child.args, + "--keep=receive-pack %"PRIuMAX" on %s", + (uintmax_t)getpid(), + hostname); + + if (!quiet && err_fd) + argv_array_push(&child.args, "--show-resolving-progress"); + if (use_sideband) + argv_array_push(&child.args, "--report-end-of-input"); + if (fsck_objects) + argv_array_pushf(&child.args, "--strict%s", + fsck_msg_types.buf); + if (!reject_thin) + argv_array_push(&child.args, "--fix-thin"); + if (max_input_size) + argv_array_pushf(&child.args, "--max-input-size=%"PRIuMAX, + (uintmax_t)max_input_size); + child.out = -1; + child.err = err_fd; + child.git_cmd = 1; + status = start_command(&child); + if (status) + return "index-pack fork failed"; + pack_lockfile = index_pack_lockfile(child.out); + close(child.out); + status = finish_command(&child); + if (status) + return "index-pack abnormal exit"; + reprepare_packed_git(the_repository); + } + return NULL; +} + +static const char *unpack_with_sideband(struct shallow_info *si) +{ + struct async muxer; + const char *ret; + + if (!use_sideband) + return unpack(0, si); + + use_keepalive = KEEPALIVE_AFTER_NUL; + memset(&muxer, 0, sizeof(muxer)); + muxer.proc = copy_to_sideband; + muxer.in = -1; + if (start_async(&muxer)) + return NULL; + + ret = unpack(muxer.in, si); + + finish_async(&muxer); + return ret; +} + +static void prepare_shallow_update(struct shallow_info *si) +{ + int i, j, k, bitmap_size = DIV_ROUND_UP(si->ref->nr, 32); + + ALLOC_ARRAY(si->used_shallow, si->shallow->nr); + assign_shallow_commits_to_refs(si, si->used_shallow, NULL); + + si->need_reachability_test = + xcalloc(si->shallow->nr, sizeof(*si->need_reachability_test)); + si->reachable = + xcalloc(si->shallow->nr, sizeof(*si->reachable)); + si->shallow_ref = xcalloc(si->ref->nr, sizeof(*si->shallow_ref)); + + for (i = 0; i < si->nr_ours; i++) + si->need_reachability_test[si->ours[i]] = 1; + + for (i = 0; i < si->shallow->nr; i++) { + if (!si->used_shallow[i]) + continue; + for (j = 0; j < bitmap_size; j++) { + if (!si->used_shallow[i][j]) + continue; + si->need_reachability_test[i]++; + for (k = 0; k < 32; k++) + if (si->used_shallow[i][j] & (1U << k)) + si->shallow_ref[j * 32 + k]++; + } + + /* + * true for those associated with some refs and belong + * in "ours" list aka "step 7 not done yet" + */ + si->need_reachability_test[i] = + si->need_reachability_test[i] > 1; + } + + /* + * keep hooks happy by forcing a temporary shallow file via + * env variable because we can't add --shallow-file to every + * command. check_connected() will be done with + * true .git/shallow though. + */ + setenv(GIT_SHALLOW_FILE_ENVIRONMENT, alt_shallow_file, 1); +} + +static void update_shallow_info(struct command *commands, + struct shallow_info *si, + struct oid_array *ref) +{ + struct command *cmd; + int *ref_status; + remove_nonexistent_theirs_shallow(si); + if (!si->nr_ours && !si->nr_theirs) { + shallow_update = 0; + return; + } + + for (cmd = commands; cmd; cmd = cmd->next) { + if (is_null_oid(&cmd->new_oid)) + continue; + oid_array_append(ref, &cmd->new_oid); + cmd->index = ref->nr - 1; + } + si->ref = ref; + + if (shallow_update) { + prepare_shallow_update(si); + return; + } + + ALLOC_ARRAY(ref_status, ref->nr); + assign_shallow_commits_to_refs(si, NULL, ref_status); + for (cmd = commands; cmd; cmd = cmd->next) { + if (is_null_oid(&cmd->new_oid)) + continue; + if (ref_status[cmd->index]) { + cmd->error_string = "shallow update not allowed"; + cmd->skip_update = 1; + } + } + free(ref_status); +} + +static void report(struct command *commands, const char *unpack_status) +{ + struct command *cmd; + struct strbuf buf = STRBUF_INIT; + + packet_buf_write(&buf, "unpack %s\n", + unpack_status ? unpack_status : "ok"); + for (cmd = commands; cmd; cmd = cmd->next) { + if (!cmd->error_string) + packet_buf_write(&buf, "ok %s\n", + cmd->ref_name); + else + packet_buf_write(&buf, "ng %s %s\n", + cmd->ref_name, cmd->error_string); + } + packet_buf_flush(&buf); + + if (use_sideband) + send_sideband(1, 1, buf.buf, buf.len, use_sideband); + else + write_or_die(1, buf.buf, buf.len); + strbuf_release(&buf); +} + +static int delete_only(struct command *commands) +{ + struct command *cmd; + for (cmd = commands; cmd; cmd = cmd->next) { + if (!is_null_oid(&cmd->new_oid)) + return 0; + } + return 1; +} + +int cmd_receive_pack(int argc, const char **argv, const char *prefix) +{ + int advertise_refs = 0; + struct command *commands; + struct oid_array shallow = OID_ARRAY_INIT; + struct oid_array ref = OID_ARRAY_INIT; + struct shallow_info si; + struct packet_reader reader; + + struct option options[] = { + OPT__QUIET(&quiet, N_("quiet")), + OPT_HIDDEN_BOOL(0, "stateless-rpc", &stateless_rpc, NULL), + OPT_HIDDEN_BOOL(0, "advertise-refs", &advertise_refs, NULL), + OPT_HIDDEN_BOOL(0, "reject-thin-pack-for-testing", &reject_thin, NULL), + OPT_END() + }; + + packet_trace_identity("receive-pack"); + + argc = parse_options(argc, argv, prefix, options, receive_pack_usage, 0); + + if (argc > 1) + usage_msg_opt(_("Too many arguments."), receive_pack_usage, options); + if (argc == 0) + usage_msg_opt(_("You must specify a directory."), receive_pack_usage, options); + + service_dir = argv[0]; + + setup_path(); + + if (!enter_repo(service_dir, 0)) + die("'%s' does not appear to be a git repository", service_dir); + + git_config(receive_pack_config, NULL); + if (cert_nonce_seed) + push_cert_nonce = prepare_push_cert_nonce(service_dir, time(NULL)); + + if (0 <= transfer_unpack_limit) + unpack_limit = transfer_unpack_limit; + else if (0 <= receive_unpack_limit) + unpack_limit = receive_unpack_limit; + + switch (determine_protocol_version_server()) { + case protocol_v2: + /* + * push support for protocol v2 has not been implemented yet, + * so ignore the request to use v2 and fallback to using v0. + */ + break; + case protocol_v1: + /* + * v1 is just the original protocol with a version string, + * so just fall through after writing the version string. + */ + if (advertise_refs || !stateless_rpc) + packet_write_fmt(1, "version 1\n"); + + /* fallthrough */ + case protocol_v0: + break; + case protocol_unknown_version: + BUG("unknown protocol version"); + } + + if (advertise_refs || !stateless_rpc) { + write_head_info(); + } + if (advertise_refs) + return 0; + + packet_reader_init(&reader, 0, NULL, 0, + PACKET_READ_CHOMP_NEWLINE | + PACKET_READ_DIE_ON_ERR_PACKET); + + if ((commands = read_head_info(&reader, &shallow)) != NULL) { + const char *unpack_status = NULL; + struct string_list push_options = STRING_LIST_INIT_DUP; + + if (use_push_options) + read_push_options(&reader, &push_options); + if (!check_cert_push_options(&push_options)) { + struct command *cmd; + for (cmd = commands; cmd; cmd = cmd->next) + cmd->error_string = "inconsistent push options"; + } + + prepare_shallow_info(&si, &shallow); + if (!si.nr_ours && !si.nr_theirs) + shallow_update = 0; + if (!delete_only(commands)) { + unpack_status = unpack_with_sideband(&si); + update_shallow_info(commands, &si, &ref); + } + use_keepalive = KEEPALIVE_ALWAYS; + execute_commands(commands, unpack_status, &si, + &push_options); + if (pack_lockfile) + unlink_or_warn(pack_lockfile); + if (report_status) + report(commands, unpack_status); + run_receive_hook(commands, "post-receive", 1, + &push_options); + run_update_post_hook(commands); + string_list_clear(&push_options, 0); + if (auto_gc) { + const char *argv_gc_auto[] = { + "gc", "--auto", "--quiet", NULL, + }; + struct child_process proc = CHILD_PROCESS_INIT; + + proc.no_stdin = 1; + proc.stdout_to_stderr = 1; + proc.err = use_sideband ? -1 : 0; + proc.git_cmd = 1; + proc.argv = argv_gc_auto; + + close_object_store(the_repository->objects); + if (!start_command(&proc)) { + if (use_sideband) + copy_to_sideband(proc.err, -1, NULL); + finish_command(&proc); + } + } + if (auto_update_server_info) + update_server_info(0); + clear_shallow_info(&si); + } + if (use_sideband) + packet_flush(1); + oid_array_clear(&shallow); + oid_array_clear(&ref); + free((void *)push_cert_nonce); + return 0; +} |