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receive-pack.c
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#include "builtin.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 "transport.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"
static const char receive_pack_usage[] = "git receive-pack <git-dir>";
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 int receive_unpack_limit = -1;
static int transfer_unpack_limit = -1;
static int advertise_atomic_push = 1;
static int unpack_limit = 100;
static int report_status;
static int use_sideband;
static int use_atomic;
static int quiet;
static int prefer_ofs_delta = 1;
static int auto_update_server_info;
static int auto_gc = 1;
static int fix_thin = 1;
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 unsigned char push_cert_sha1[20];
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 unsigned long nonce_stamp_slop_limit;
static struct ref_transaction *transaction;
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.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;
}
return git_default_config(var, value, cb);
}
static void show_ref(const char *path, const unsigned char *sha1)
{
if (ref_is_hidden(path))
return;
if (sent_capabilities) {
packet_write(1, "%s %s\n", sha1_to_hex(sha1), 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);
strbuf_addf(&cap, " agent=%s", git_user_agent_sanitized());
packet_write(1, "%s %s%c%s\n",
sha1_to_hex(sha1), path, 0, cap.buf);
strbuf_release(&cap);
sent_capabilities = 1;
}
}
static int show_ref_cb(const char *path, const unsigned char *sha1, int flag, void *unused)
{
path = strip_namespace(path);
/*
* 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. This happens to
* cover ".have" that are thrown in by add_one_alternate_ref()
* to mark histories that are complete in our alternates as
* well.
*/
if (!path)
path = ".have";
show_ref(path, sha1);
return 0;
}
static void show_one_alternate_sha1(const unsigned char sha1[20], void *unused)
{
show_ref(".have", sha1);
}
static void collect_one_alternate_ref(const struct ref *ref, void *data)
{
struct sha1_array *sa = data;
sha1_array_append(sa, ref->old_sha1);
}
static void write_head_info(void)
{
struct sha1_array sa = SHA1_ARRAY_INIT;
for_each_alternate_ref(collect_one_alternate_ref, &sa);
sha1_array_for_each_unique(&sa, show_one_alternate_sha1, NULL);
sha1_array_clear(&sa);
for_each_ref(show_ref_cb, NULL);
if (!sent_capabilities)
show_ref("capabilities^{}", null_sha1);
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;
unsigned char old_sha1[20];
unsigned char new_sha1[20];
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 = strlen(prefix);
char msg[4096];
strncpy(msg, prefix, sz);
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];
while (1) {
ssize_t sz = xread(in, data, sizeof(data));
if (sz <= 0)
break;
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, 20);
git_SHA1_Final(out, &ctx);
}
static char *prepare_push_cert_nonce(const char *path, unsigned long stamp)
{
struct strbuf buf = STRBUF_INIT;
unsigned char sha1[20];
strbuf_addf(&buf, "%s:%lu", 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, "%lu-%.*s", stamp, 20, 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)
{
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;
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");
unsigned long 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 = strtoul(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 = strtoul(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;
}
static void prepare_push_cert_sha1(struct child_process *proc)
{
static int already_done;
if (!push_cert.len)
return;
if (!already_done) {
struct strbuf gpg_output = STRBUF_INIT;
struct strbuf gpg_status = STRBUF_INIT;
int bogs /* beginning_of_gpg_sig */;
already_done = 1;
if (write_sha1_file(push_cert.buf, push_cert.len, "blob", push_cert_sha1))
hashclr(push_cert_sha1);
memset(&sigcheck, '\0', sizeof(sigcheck));
sigcheck.result = 'N';
bogs = parse_signature(push_cert.buf, push_cert.len);
if (verify_signed_buffer(push_cert.buf, bogs,
push_cert.buf + bogs, push_cert.len - bogs,
&gpg_output, &gpg_status) < 0) {
; /* error running gpg */
} else {
sigcheck.payload = push_cert.buf;
sigcheck.gpg_output = gpg_output.buf;
sigcheck.gpg_status = gpg_status.buf;
parse_gpg_output(&sigcheck);
}
strbuf_release(&gpg_output);
strbuf_release(&gpg_status);
nonce_status = check_nonce(push_cert.buf, bogs);
}
if (!is_null_sha1(push_cert_sha1)) {
argv_array_pushf(&proc->env_array, "GIT_PUSH_CERT=%s",
sha1_to_hex(push_cert_sha1));
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);
}
}
}
typedef int (*feed_fn)(void *, const char **, size_t *);
static int run_and_feed_hook(const char *hook_name, feed_fn feed, void *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;
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) != n)
break;
}
close(proc.in);
if (use_sideband)
finish_async(&muxer);
sigchain_pop(SIGPIPE);
return finish_command(&proc);
}
struct receive_hook_feed_state {
struct command *cmd;
int skip_broken;
struct strbuf buf;
};
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",
sha1_to_hex(cmd->old_sha1), sha1_to_hex(cmd->new_sha1),
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)
{
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;
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] = sha1_to_hex(cmd->old_sha1);
argv[3] = sha1_to_hex(cmd->new_sha1);
argv[4] = NULL;
proc.no_stdin = 1;
proc.stdout_to_stderr = 1;
proc.err = use_sideband ? -1 : 0;
proc.argv = argv;
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[] = {
"By default, updating the current branch in a non-bare repository",
"is denied, because it will make the index and work tree inconsistent",
"with what you pushed, and will require 'git reset --hard' to match",
"the work tree to HEAD.",
"",
"You can set 'receive.denyCurrentBranch' configuration variable to",
"'ignore' or 'warn' in the remote repository to allow pushing into",
"its current branch; however, this is not recommended unless you",
"arranged to update its work tree to match what you pushed in some",
"other way.",
"",
"To squelch this message and still keep the default behaviour, set",
"'receive.denyCurrentBranch' configuration variable to 'refuse'."
};
static void refuse_unconfigured_deny(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(refuse_unconfigured_deny_msg); i++)
rp_error("%s", refuse_unconfigured_deny_msg[i]);
}
static char *refuse_unconfigured_deny_delete_current_msg[] = {
"By default, deleting the current branch is denied, because the next",
"'git clone' won't result in any file checked out, causing confusion.",
"",
"You can set 'receive.denyDeleteCurrent' configuration variable to",
"'warn' or 'ignore' in the remote repository to allow deleting the",
"current branch, with or without a warning message.",
"",
"To squelch this message, you can set it to 'refuse'."
};
static void refuse_unconfigured_deny_delete_current(void)
{
int i;
for (i = 0;
i < ARRAY_SIZE(refuse_unconfigured_deny_delete_current_msg);
i++)
rp_error("%s", refuse_unconfigured_deny_delete_current_msg[i]);
}
static int command_singleton_iterator(void *cb_data, unsigned char sha1[20]);
static int update_shallow_ref(struct command *cmd, struct shallow_info *si)
{
static struct lock_file shallow_lock;
struct sha1_array extra = SHA1_ARRAY_INIT;
const char *alt_file;
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))
sha1_array_append(&extra, si->shallow->sha1[i]);
setup_alternate_shallow(&shallow_lock, &alt_file, &extra);
if (check_shallow_connected(command_singleton_iterator,
0, cmd, alt_file)) {
rollback_lock_file(&shallow_lock);
sha1_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(extra.sha1[i]);
si->shallow_ref[cmd->index] = 0;
sha1_array_clear(&extra);
return 0;
}
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",
"HEAD", "--", 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";
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;
const char *namespaced_name, *ret;
unsigned char *old_sha1 = cmd->old_sha1;
unsigned char *new_sha1 = cmd->new_sha1;
/* 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);
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:
ret = update_worktree(new_sha1);
if (ret)
return ret;
break;
}
}
if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
error("unpack should have generated %s, "
"but I can't find it!", sha1_to_hex(new_sha1));
return "bad pack";
}
if (!is_null_sha1(old_sha1) && is_null_sha1(new_sha1)) {
if (deny_deletes && starts_with(name, "refs/heads/")) {
rp_error("denying ref deletion for %s", name);
return "deletion prohibited";
}
if (!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_sha1(new_sha1) &&
!is_null_sha1(old_sha1) &&
starts_with(name, "refs/heads/")) {
struct object *old_object, *new_object;
struct commit *old_commit, *new_commit;
old_object = parse_object(old_sha1);
new_object = parse_object(new_sha1);
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 (is_null_sha1(new_sha1)) {
struct strbuf err = STRBUF_INIT;
if (!parse_object(old_sha1)) {
old_sha1 = 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_sha1,
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_sha1, old_sha1,
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;
int argc;
const char **argv;
struct child_process proc = CHILD_PROCESS_INIT;
char *hook;
hook = find_hook("post-update");
for (argc = 0, cmd = commands; cmd; cmd = cmd->next) {
if (cmd->error_string || cmd->did_not_exist)
continue;
argc++;
}
if (!argc || !hook)