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#include "cache.h"
#include "pkt-line.h"
#include <sys/wait.h>
static const char receive_pack_usage[] = "git-receive-pack [--unpack=executable] <git-dir> [heads]";
static const char *unpacker = "git-unpack-objects";
static int path_match(const char *path, int nr, char **match)
{
int i;
int pathlen = strlen(path);
for (i = 0; i < nr; i++) {
char *s = match[i];
int len = strlen(s);
if (!len || len > pathlen)
continue;
if (memcmp(path + pathlen - len, s, len))
continue;
if (pathlen > len && path[pathlen - len - 1] != '/')
continue;
*s = 0;
return 1;
}
return 0;
}
static void show_ref(const char *path, unsigned char *sha1)
{
packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
}
static int read_ref(const char *path, unsigned char *sha1)
{
int ret = -1;
int fd = open(path, O_RDONLY);
if (fd >= 0) {
char buffer[60];
if (read(fd, buffer, sizeof(buffer)) >= 40)
ret = get_sha1_hex(buffer, sha1);
close(fd);
}
return ret;
}
static void write_head_info(const char *base, int nr, char **match)
{
DIR *dir = opendir(base);
if (dir) {
struct dirent *de;
int baselen = strlen(base);
char *path = xmalloc(baselen + 257);
memcpy(path, base, baselen);
while ((de = readdir(dir)) != NULL) {
char sha1[20];
struct stat st;
int namelen;
if (de->d_name[0] == '.')
continue;
namelen = strlen(de->d_name);
if (namelen > 255)
continue;
memcpy(path + baselen, de->d_name, namelen+1);
if (lstat(path, &st) < 0)
continue;
if (S_ISDIR(st.st_mode)) {
path[baselen + namelen] = '/';
path[baselen + namelen + 1] = 0;
write_head_info(path, nr, match);
continue;
}
if (read_ref(path, sha1) < 0)
continue;
if (nr && !path_match(path, nr, match))
continue;
show_ref(path, sha1);
}
free(path);
closedir(dir);
}
}
struct command {
struct command *next;
unsigned char old_sha1[20];
unsigned char new_sha1[20];
char ref_name[0];
};
struct command *commands = NULL;
/*
* This gets called after(if) we've successfully
* unpacked the data payload.
*/
static void execute_commands(void)
{
struct command *cmd = commands;
while (cmd) {
char old_hex[60], *new_hex;
strcpy(old_hex, sha1_to_hex(cmd->old_sha1));
new_hex = sha1_to_hex(cmd->new_sha1);
fprintf(stderr, "%s: %s -> %s\n", cmd->ref_name, old_hex, new_hex);
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;
int len;
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);
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->next = NULL;
*p = cmd;
p = &cmd->next;
}
}
static void unpack(void)
{
pid_t pid = fork();
if (pid < 0)
die("unpack fork failed");
if (!pid) {
setenv("GIT_DIR", ".", 1);
execlp(unpacker, unpacker, NULL);
die("unpack execute failed");
}
for (;;) {
int status, code;
int retval = waitpid(pid, &status, 0);
if (retval < 0) {
if (errno == EINTR)
continue;
die("waitpid failed (%s)", strerror(retval));
}
if (retval != pid)
die("waitpid is confused");
if (WIFSIGNALED(status))
die("%s died of signal %d", unpacker, WTERMSIG(status));
if (!WIFEXITED(status))
die("%s died out of really strange complications", unpacker);
code = WEXITSTATUS(status);
if (code)
die("%s exited with error code %d", unpacker, code);
return;
}
}
int main(int argc, char **argv)
{
int i, nr_heads = 0;
const char *dir = NULL;
char **heads = NULL;
argv++;
for (i = 1; i < argc; i++) {
const char *arg = *argv++;
if (*arg == '-') {
if (!strncmp(arg, "--unpack=", 9)) {
unpacker = arg+9;
continue;
}
/* Do flag handling here */
usage(receive_pack_usage);
}
dir = arg;
heads = argv;
nr_heads = argc - i - 1;
break;
}
if (!dir)
usage(receive_pack_usage);
/* chdir to the directory. If that fails, try appending ".git" */
if (chdir(dir) < 0) {
static char path[PATH_MAX];
snprintf(path, sizeof(path), "%s.git", dir);
if (chdir(path) < 0)
die("unable to cd to %s", dir);
}
/* If we have a ".git" directory, chdir to it */
chdir(".git");
if (access("objects", X_OK) < 0 || access("refs/heads", X_OK) < 0)
die("%s doesn't appear to be a git directory", dir);
write_head_info("refs/", nr_heads, heads);
/* EOF */
packet_flush(1);
read_head_info();
if (commands) {
unpack();
execute_commands();
}
return 0;
}
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