git/receive-pack.c

341 строка
7.6 KiB
C

#include "cache.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"
#include <sys/wait.h>
static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
static const char *unpacker[] = { "unpack-objects", NULL };
static int report_status = 0;
static char capabilities[] = "report-status";
static int capabilities_sent = 0;
static int show_ref(const char *path, const unsigned char *sha1)
{
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);
if (!capabilities_sent)
show_ref("capabilities^{}", null_sha1);
}
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 = NULL;
static int is_all_zeroes(const char *hex)
{
int i;
for (i = 0; i < 40; i++)
if (*hex++ != '0')
return 0;
return 1;
}
static int verify_old_ref(const char *name, char *hex_contents)
{
int fd, ret;
char buffer[60];
if (is_all_zeroes(hex_contents))
return 0;
fd = open(name, O_RDONLY);
if (fd < 0)
return -1;
ret = read(fd, buffer, 40);
close(fd);
if (ret != 40)
return -1;
if (memcmp(buffer, hex_contents, 40))
return -1;
return 0;
}
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(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[60], *old_hex, *lock_name;
int newfd, namelen, written;
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);
}
namelen = strlen(name);
lock_name = xmalloc(namelen + 10);
memcpy(lock_name, name, namelen);
memcpy(lock_name + namelen, ".lock", 6);
strcpy(new_hex, sha1_to_hex(new_sha1));
old_hex = sha1_to_hex(old_sha1);
if (!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);
}
safe_create_leading_directories(lock_name);
newfd = open(lock_name, O_CREAT | O_EXCL | O_WRONLY, 0666);
if (newfd < 0) {
cmd->error_string = "can't lock";
return error("unable to create %s (%s)",
lock_name, strerror(errno));
}
/* Write the ref with an ending '\n' */
new_hex[40] = '\n';
new_hex[41] = 0;
written = write(newfd, new_hex, 41);
/* Remove the '\n' again */
new_hex[40] = 0;
close(newfd);
if (written != 41) {
unlink(lock_name);
cmd->error_string = "can't write";
return error("unable to write %s", lock_name);
}
if (verify_old_ref(name, old_hex) < 0) {
unlink(lock_name);
cmd->error_string = "raced";
return error("%s changed during push", name);
}
if (run_update_hook(name, old_hex, new_hex)) {
unlink(lock_name);
cmd->error_string = "hook declined";
return error("hook declined to update %s", name);
}
else if (rename(lock_name, name) < 0) {
unlink(lock_name);
cmd->error_string = "can't rename";
return error("unable to replace %s", name);
}
else {
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(argc, argv, RUN_COMMAND_NO_STDIO);
}
/*
* 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);
memcpy(cmd->old_sha1, old_sha1, 20);
memcpy(cmd->new_sha1, new_sha1, 20);
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 *unpack(int *error_code)
{
int code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
*error_code = 0;
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:
*error_code = -code;
return "unpacker exited with error code";
}
}
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);
}
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);
write_head_info();
/* EOF */
packet_flush(1);
read_head_info();
if (commands) {
int code;
const char *unpack_status = unpack(&code);
if (!unpack_status)
execute_commands();
if (report_status)
report(unpack_status);
}
return 0;
}