git/receive-pack.c

449 строки
11 KiB
C

#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"
static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
static int deny_non_fast_forwards = 0;
static int unpack_limit = 100;
static int report_status;
static char capabilities[] = " report-status delete-refs ";
static int capabilities_sent;
static int receive_pack_config(const char *var, const char *value)
{
git_default_config(var, value);
if (strcmp(var, "receive.denynonfastforwards") == 0)
{
deny_non_fast_forwards = git_config_bool(var, value);
return 0;
}
if (strcmp(var, "receive.unpacklimit") == 0)
{
unpack_limit = git_config_int(var, value);
return 0;
}
return 0;
}
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 char update_hook[] = "hooks/update";
static int run_update_hook(const char *refname,
char *old_hex, char *new_hex)
{
int code;
if (access(update_hook, X_OK) < 0)
return 0;
code = run_command_opt(RUN_COMMAND_NO_STDIN
| RUN_COMMAND_STDOUT_TO_STDERR,
update_hook, refname, old_hex, new_hex, NULL);
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_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", update_hook);
case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
return error("%s died strangely", update_hook);
default:
error("%s exited with error code %d", update_hook, -code);
return -code;
}
}
static int update(struct command *cmd)
{
const char *name = cmd->ref_name;
unsigned char *old_sha1 = cmd->old_sha1;
unsigned char *new_sha1 = cmd->new_sha1;
char new_hex[41], old_hex[41];
struct ref_lock *lock;
cmd->error_string = NULL;
if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
cmd->error_string = "funny refname";
return error("refusing to create funny ref '%s' locally",
name);
}
strcpy(new_hex, sha1_to_hex(new_sha1));
strcpy(old_hex, sha1_to_hex(old_sha1));
if (!is_null_sha1(new_sha1) && !has_sha1_file(new_sha1)) {
cmd->error_string = "bad pack";
return error("unpack should have generated %s, "
"but I can't find it!", new_hex);
}
if (deny_non_fast_forwards && !is_null_sha1(new_sha1) &&
!is_null_sha1(old_sha1) &&
!strncmp(name, "refs/heads/", 11)) {
struct commit *old_commit, *new_commit;
struct commit_list *bases, *ent;
old_commit = (struct commit *)parse_object(old_sha1);
new_commit = (struct commit *)parse_object(new_sha1);
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)
return error("denying non-fast forward;"
" you should pull first");
}
if (run_update_hook(name, old_hex, new_hex)) {
cmd->error_string = "hook declined";
return error("hook declined to update %s", name);
}
if (is_null_sha1(new_sha1)) {
if (delete_ref(name, old_sha1)) {
cmd->error_string = "failed to delete";
return error("failed to delete %s", name);
}
fprintf(stderr, "%s: %s -> deleted\n", name, old_hex);
}
else {
lock = lock_any_ref_for_update(name, old_sha1);
if (!lock) {
cmd->error_string = "failed to lock";
return error("failed to lock %s", name);
}
write_ref_sha1(lock, new_sha1, "push");
fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
}
return 0;
}
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;
if (access(update_post_hook, X_OK) < 0)
return;
for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
if (cmd_p->error_string)
continue;
argc++;
}
argv = xmalloc(sizeof(*argv) * (1 + 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);
}
/*
* This gets called after(if) we've successfully
* unpacked the data payload.
*/
static void execute_commands(void)
{
struct command *cmd = commands;
while (cmd) {
update(cmd);
cmd = cmd->next;
}
run_update_post_hook(commands);
}
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 = "n/a (unpacker error)";
cmd->next = NULL;
*p = cmd;
p = &cmd->next;
}
}
static const char *parse_pack_header(struct pack_header *hdr)
{
char *c = (char*)hdr;
ssize_t remaining = sizeof(struct pack_header);
do {
ssize_t r = xread(0, c, remaining);
if (r <= 0)
return "eof before pack header was fully read";
remaining -= r;
c += r;
} while (remaining > 0);
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
return "protocol error (pack signature mismatch detected)";
if (!pack_version_ok(hdr->hdr_version))
return "protocol error (pack version unsupported)";
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=%u,%u",
ntohl(hdr.hdr_version), ntohl(hdr.hdr_entries));
if (ntohl(hdr.hdr_entries) < unpack_limit) {
int code;
const char *unpacker[3];
unpacker[0] = "unpack-objects";
unpacker[1] = hdr_arg;
unpacker[2] = 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[6];
int fd[2], s, len, status;
pid_t pid;
char keep_arg[256];
char packname[46];
s = sprintf(keep_arg, "--keep=receive-pack %i on ", getpid());
if (gethostname(keep_arg + s, sizeof(keep_arg) - s))
strcpy(keep_arg + s, "localhost");
keeper[0] = "index-pack";
keeper[1] = "--stdin";
keeper[2] = "--fix-thin";
keeper[3] = hdr_arg;
keeper[4] = keep_arg;
keeper[5] = NULL;
if (pipe(fd) < 0)
return "index-pack pipe failed";
pid = fork();
if (pid < 0)
return "index-pack fork failed";
if (!pid) {
dup2(fd[1], 1);
close(fd[1]);
close(fd[0]);
execv_git_cmd(keeper);
die("execv of index-pack failed");
}
close(fd[1]);
/*
* The first thing we expects from index-pack's output
* is "pack\t%40s\n" or "keep\t%40s\n" (46 bytes) where
* %40s is the newly created pack SHA1 name. In the "keep"
* case, we need it to remove the corresponding .keep file
* later on. If we don't get that then tough luck with it.
*/
for (len = 0;
len < 46 && (s = xread(fd[0], packname+len, 46-len)) > 0;
len += s);
close(fd[0]);
if (len == 46 && packname[45] == '\n' &&
memcmp(packname, "keep\t", 5) == 0) {
char path[PATH_MAX];
packname[45] = 0;
snprintf(path, sizeof(path), "%s/pack/pack-%s.keep",
get_object_directory(), packname + 5);
pack_lockfile = xstrdup(path);
}
/* Then wrap our index-pack process. */
while (waitpid(pid, &status, 0) < 0)
if (errno != EINTR)
return "waitpid failed";
if (WIFEXITED(status)) {
int code = WEXITSTATUS(status);
if (code)
return "index-pack exited with error code";
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;
}
int main(int argc, char **argv)
{
int i;
char *dir = NULL;
argv++;
for (i = 1; i < argc; i++) {
char *arg = *argv++;
if (*arg == '-') {
/* Do flag handling here */
usage(receive_pack_usage);
}
if (dir)
usage(receive_pack_usage);
dir = arg;
}
if (!dir)
usage(receive_pack_usage);
if (!enter_repo(dir, 0))
die("'%s': unable to chdir or not a git archive", dir);
setup_ident();
/* don't die if gecos is empty */
ignore_missing_committer_name();
git_config(receive_pack_config);
write_head_info();
/* EOF */
packet_flush(1);
read_head_info();
if (commands) {
const char *unpack_status = NULL;
if (!delete_only(commands))
unpack_status = unpack();
if (!unpack_status)
execute_commands();
if (pack_lockfile)
unlink(pack_lockfile);
if (report_status)
report(unpack_status);
}
return 0;
}