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#include "cache.h"
#include "pack.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"
#include "exec_cmd.h"
#include "commit.h"
#include "object.h"
#include "remote.h"
#include "transport.h"

static const char receive_pack_usage[] = "git-receive-pack <git-dir>";

enum deny_action {
DENY_IGNORE,
DENY_WARN,
DENY_REFUSE,
};

static int deny_deletes = 0;
static int deny_non_fast_forwards = 0;
static enum deny_action deny_current_branch = DENY_WARN;
static int receive_fsck_objects;
static int receive_unpack_limit = -1;
static int transfer_unpack_limit = -1;
static int unpack_limit = 100;
static int report_status;

static char capabilities[] = " report-status delete-refs ";
static int capabilities_sent;

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 (git_config_bool(var, value))
return DENY_REFUSE;
return DENY_IGNORE;
}

static int receive_pack_config(const char *var, const char *value, void *cb)
{
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, "receive.denycurrentbranch")) {
deny_current_branch = parse_deny_action(var, value);
return 0;
}

return git_default_config(var, value, cb);
}

static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
{
if (capabilities_sent)
packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
else
packet_write(1, "%s %s%c%s\n",
sha1_to_hex(sha1), path, 0, capabilities);
capabilities_sent = 1;
return 0;
}

static void write_head_info(void)
{
for_each_ref(show_ref, NULL);
if (!capabilities_sent)
show_ref("capabilities^{}", null_sha1, 0, NULL);

}

struct command {
struct command *next;
const char *error_string;
unsigned char old_sha1[20];
unsigned char new_sha1[20];
char ref_name[FLEX_ARRAY]; /* more */
};

static struct command *commands;

static const char pre_receive_hook[] = "hooks/pre-receive";
static const char post_receive_hook[] = "hooks/post-receive";

static int hook_status(int code, const char *hook_name)
{
switch (code) {
case 0:
return 0;
case -ERR_RUN_COMMAND_FORK:
return error("hook fork failed");
case -ERR_RUN_COMMAND_EXEC:
return error("hook execute failed");
case -ERR_RUN_COMMAND_PIPE:
return error("hook pipe failed");
case -ERR_RUN_COMMAND_WAITPID:
return error("waitpid failed");
case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
return error("waitpid is confused");
case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
return error("%s died of signal", hook_name);
case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
return error("%s died strangely", hook_name);
default:
error("%s exited with error code %d", hook_name, -code);
return -code;
}
}

static int run_hook(const char *hook_name)
{
static char buf[sizeof(commands->old_sha1) * 2 + PATH_MAX + 4];
struct command *cmd;
struct child_process proc;
const char *argv[2];
int have_input = 0, code;

for (cmd = commands; !have_input && cmd; cmd = cmd->next) {
if (!cmd->error_string)
have_input = 1;
}

if (!have_input || access(hook_name, X_OK) < 0)
return 0;

argv[0] = hook_name;
argv[1] = NULL;

memset(&proc, 0, sizeof(proc));
proc.argv = argv;
proc.in = -1;
proc.stdout_to_stderr = 1;

code = start_command(&proc);
if (code)
return hook_status(code, hook_name);
for (cmd = commands; cmd; cmd = cmd->next) {
if (!cmd->error_string) {
size_t n = snprintf(buf, sizeof(buf), "%s %s %s\n",
sha1_to_hex(cmd->old_sha1),
sha1_to_hex(cmd->new_sha1),
cmd->ref_name);
if (write_in_full(proc.in, buf, n) != n)
break;
}
}
close(proc.in);
return hook_status(finish_command(&proc), hook_name);
}

static int run_update_hook(struct command *cmd)
{
static const char update_hook[] = "hooks/update";
struct child_process proc;
const char *argv[5];

if (access(update_hook, X_OK) < 0)
return 0;

argv[0] = update_hook;
argv[1] = cmd->ref_name;
argv[2] = sha1_to_hex(cmd->old_sha1);
argv[3] = sha1_to_hex(cmd->new_sha1);
argv[4] = NULL;

memset(&proc, 0, sizeof(proc));
proc.argv = argv;
proc.no_stdin = 1;
proc.stdout_to_stderr = 1;

return hook_status(run_command(&proc), update_hook);
}

static int is_ref_checked_out(const char *ref)
{
unsigned char sha1[20];
const char *head;

if (is_bare_repository())
return 0;

head = resolve_ref("HEAD", sha1, 0, NULL);
if (!head)
return 0;
return !strcmp(head, ref);
}

static const char *update(struct command *cmd)
{
const char *name = cmd->ref_name;
unsigned char *old_sha1 = cmd->old_sha1;
unsigned char *new_sha1 = cmd->new_sha1;
struct ref_lock *lock;

/* only refs/... are allowed */
if (prefixcmp(name, "refs/") || check_ref_format(name + 5)) {
error("refusing to create funny ref '%s' remotely", name);
return "funny refname";
}

switch (deny_current_branch) {
case DENY_IGNORE:
break;
case DENY_WARN:
if (!is_ref_checked_out(name))
break;
warning("updating the currently checked out branch; this may"
" cause confusion,\n"
"as the index and working tree do not reflect changes"
" that are now in HEAD.");
break;
case DENY_REFUSE:
if (!is_ref_checked_out(name))
break;
error("refusing to update checked out branch: %s", name);
return "branch is currently checked out";
}

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 (deny_deletes && is_null_sha1(new_sha1) &&
!is_null_sha1(old_sha1) &&
!prefixcmp(name, "refs/heads/")) {
error("denying ref deletion for %s", name);
return "deletion prohibited";
}
if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
!is_null_sha1(old_sha1) &&
!prefixcmp(name, "refs/heads/")) {
struct object *old_object, *new_object;
struct commit *old_commit, *new_commit;
struct commit_list *bases, *ent;

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;
bases = get_merge_bases(old_commit, new_commit, 1);
for (ent = bases; ent; ent = ent->next)
if (!hashcmp(old_sha1, ent->item->object.sha1))
break;
free_commit_list(bases);
if (!ent) {
error("denying non-fast forward %s"
" (you should pull first)", name);
return "non-fast forward";
}
}
if (run_update_hook(cmd)) {
error("hook declined to update %s", name);
return "hook declined";
}

if (is_null_sha1(new_sha1)) {
if (!parse_object(old_sha1)) {
warning ("Allowing deletion of corrupt ref.");
old_sha1 = NULL;
}
if (delete_ref(name, old_sha1, 0)) {
error("failed to delete %s", name);
return "failed to delete";
}
return NULL; /* good */
}
else {
lock = lock_any_ref_for_update(name, old_sha1, 0);
if (!lock) {
error("failed to lock %s", name);
return "failed to lock";
}
if (write_ref_sha1(lock, new_sha1, "push")) {
return "failed to write"; /* error() already called */
}
return NULL; /* good */
}
}

static char update_post_hook[] = "hooks/post-update";

static void run_update_post_hook(struct command *cmd)
{
struct command *cmd_p;
int argc;
const char **argv;

for (argc = 0, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
if (cmd_p->error_string)
continue;
argc++;
}
if (!argc || access(update_post_hook, X_OK) < 0)
return;
argv = xmalloc(sizeof(*argv) * (2 + argc));
argv[0] = update_post_hook;

for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
char *p;
if (cmd_p->error_string)
continue;
p = xmalloc(strlen(cmd_p->ref_name) + 1);
strcpy(p, cmd_p->ref_name);
argv[argc] = p;
argc++;
}
argv[argc] = NULL;
run_command_v_opt(argv, RUN_COMMAND_NO_STDIN
| RUN_COMMAND_STDOUT_TO_STDERR);
}

static void execute_commands(const char *unpacker_error)
{
struct command *cmd = commands;

if (unpacker_error) {
while (cmd) {
cmd->error_string = "n/a (unpacker error)";
cmd = cmd->next;
}
return;
}

if (run_hook(pre_receive_hook)) {
while (cmd) {
cmd->error_string = "pre-receive hook declined";
cmd = cmd->next;
}
return;
}

while (cmd) {
cmd->error_string = update(cmd);
cmd = cmd->next;
}
}

static void read_head_info(void)
{
struct command **p = &commands;
for (;;) {
static char line[1000];
unsigned char old_sha1[20], new_sha1[20];
struct command *cmd;
char *refname;
int len, reflen;

len = packet_read_line(0, line, sizeof(line));
if (!len)
break;
if (line[len-1] == '\n')
line[--len] = 0;
if (len < 83 ||
line[40] != ' ' ||
line[81] != ' ' ||
get_sha1_hex(line, old_sha1) ||
get_sha1_hex(line + 41, new_sha1))
die("protocol error: expected old/new/ref, got '%s'",
line);

refname = line + 82;
reflen = strlen(refname);
if (reflen + 82 < len) {
if (strstr(refname + reflen + 1, "report-status"))
report_status = 1;
}
cmd = xmalloc(sizeof(struct command) + len - 80);
hashcpy(cmd->old_sha1, old_sha1);
hashcpy(cmd->new_sha1, new_sha1);
memcpy(cmd->ref_name, line + 82, len - 81);
cmd->error_string = NULL;
cmd->next = NULL;
*p = cmd;
p = &cmd->next;
}
}

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 const char *unpack(void)
{
struct pack_header hdr;
const char *hdr_err;
char hdr_arg[38];

hdr_err = parse_pack_header(&hdr);
if (hdr_err)
return hdr_err;
snprintf(hdr_arg, sizeof(hdr_arg),
"--pack_header=%"PRIu32",%"PRIu32,
ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));

if (ntohl(hdr.hdr_entries) < unpack_limit) {
int code, i = 0;
const char *unpacker[4];
unpacker[i++] = "unpack-objects";
if (receive_fsck_objects)
unpacker[i++] = "--strict";
unpacker[i++] = hdr_arg;
unpacker[i++] = NULL;
code = run_command_v_opt(unpacker, RUN_GIT_CMD);
switch (code) {
case 0:
return NULL;
case -ERR_RUN_COMMAND_FORK:
return "unpack fork failed";
case -ERR_RUN_COMMAND_EXEC:
return "unpack execute failed";
case -ERR_RUN_COMMAND_WAITPID:
return "waitpid failed";
case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
return "waitpid is confused";
case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
return "unpacker died of signal";
case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
return "unpacker died strangely";
default:
return "unpacker exited with error code";
}
} else {
const char *keeper[7];
int s, status, i = 0;
char keep_arg[256];
struct child_process ip;

s = sprintf(keep_arg, "--keep=receive-pack %"PRIuMAX" on ", (uintmax_t) getpid());
if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
strcpy(keep_arg + s, "localhost");

keeper[i++] = "index-pack";
keeper[i++] = "--stdin";
if (receive_fsck_objects)
keeper[i++] = "--strict";
keeper[i++] = "--fix-thin";
keeper[i++] = hdr_arg;
keeper[i++] = keep_arg;
keeper[i++] = NULL;
memset(&ip, 0, sizeof(ip));
ip.argv = keeper;
ip.out = -1;
ip.git_cmd = 1;
if (start_command(&ip))
return "index-pack fork failed";
pack_lockfile = index_pack_lockfile(ip.out);
close(ip.out);
status = finish_command(&ip);
if (!status) {
reprepare_packed_git();
return NULL;
}
return "index-pack abnormal exit";
}
}

static void report(const char *unpack_status)
{
struct command *cmd;
packet_write(1, "unpack %s\n",
unpack_status ? unpack_status : "ok");
for (cmd = commands; cmd; cmd = cmd->next) {
if (!cmd->error_string)
packet_write(1, "ok %s\n",
cmd->ref_name);
else
packet_write(1, "ng %s %s\n",
cmd->ref_name, cmd->error_string);
}
packet_flush(1);
}

static int delete_only(struct command *cmd)
{
while (cmd) {
if (!is_null_sha1(cmd->new_sha1))
return 0;
cmd = cmd->next;
}
return 1;
}

static int add_refs_from_alternate(struct alternate_object_database *e, void *unused)
{
char *other;
size_t len;
struct remote *remote;
struct transport *transport;
const struct ref *extra;

e->name[-1] = '\0';
other = xstrdup(make_absolute_path(e->base));
e->name[-1] = '/';
len = strlen(other);

while (other[len-1] == '/')
other[--len] = '\0';
if (len < 8 || memcmp(other + len - 8, "/objects", 8))
return 0;
/* Is this a git repository with refs? */
memcpy(other + len - 8, "/refs", 6);
if (!is_directory(other))
return 0;
other[len - 8] = '\0';
remote = remote_get(other);
transport = transport_get(remote, other);
for (extra = transport_get_remote_refs(transport);
extra;
extra = extra->next) {
add_extra_ref(".have", extra->old_sha1, 0);
}
transport_disconnect(transport);
free(other);
return 0;
}

static void add_alternate_refs(void)
{
foreach_alt_odb(add_refs_from_alternate, NULL);
}

int cmd_receive_pack(int argc, const char **argv, const char *prefix)
{
int i;
char *dir = NULL;

argv++;
for (i = 1; i < argc; i++) {
const char *arg = *argv++;

if (*arg == '-') {
/* Do flag handling here */
usage(receive_pack_usage);
}
if (dir)
usage(receive_pack_usage);
dir = xstrdup(arg);
}
if (!dir)
usage(receive_pack_usage);

setup_path();

if (!enter_repo(dir, 0))
die("'%s': unable to chdir or not a git archive", dir);

if (is_repository_shallow())
die("attempt to push into a shallow repository");

git_config(receive_pack_config, NULL);

if (0 <= transfer_unpack_limit)
unpack_limit = transfer_unpack_limit;
else if (0 <= receive_unpack_limit)
unpack_limit = receive_unpack_limit;

add_alternate_refs();
write_head_info();
clear_extra_refs();

/* EOF */
packet_flush(1);

read_head_info();
if (commands) {
const char *unpack_status = NULL;

if (!delete_only(commands))
unpack_status = unpack();
execute_commands(unpack_status);
if (pack_lockfile)
unlink(pack_lockfile);
if (report_status)
report(unpack_status);
run_hook(post_receive_hook);
run_update_post_hook(commands);
}
return 0;
}
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