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#include "cache.h"
#include "commit.h"
#include "refs.h"
#include "pkt-line.h"
static const char send_pack_usage[] =
"git-send-pack [--all] [--exec=git-receive-pack] <remote> [<head>...]\n"
" --all and explicit <head> specification are mutually exclusive.";
static const char *exec = "git-receive-pack";
static int send_all = 0;
static int force_update = 0;
static int is_zero_sha1(const unsigned char *sha1)
{
int i;
for (i = 0; i < 20; i++) {
if (*sha1++)
return 0;
}
return 1;
}
static void exec_pack_objects(void)
{
static char *args[] = {
"git-pack-objects",
"--stdout",
NULL
};
execvp("git-pack-objects", args);
die("git-pack-objects exec failed (%s)", strerror(errno));
}
static void exec_rev_list(struct ref *refs)
{
static char *args[1000];
int i = 0;
args[i++] = "git-rev-list"; /* 0 */
args[i++] = "--objects"; /* 1 */
while (refs) {
char *buf = malloc(100);
if (i > 900)
die("git-rev-list environment overflow");
if (!is_zero_sha1(refs->old_sha1) &&
has_sha1_file(refs->old_sha1)) {
args[i++] = buf;
snprintf(buf, 50, "^%s", sha1_to_hex(refs->old_sha1));
buf += 50;
}
if (!is_zero_sha1(refs->new_sha1)) {
args[i++] = buf;
snprintf(buf, 50, "%s", sha1_to_hex(refs->new_sha1));
}
refs = refs->next;
}
args[i] = NULL;
execvp("git-rev-list", args);
die("git-rev-list exec failed (%s)", strerror(errno));
}
static void rev_list(int fd, struct ref *refs)
{
int pipe_fd[2];
pid_t pack_objects_pid;
if (pipe(pipe_fd) < 0)
die("rev-list setup: pipe failed");
pack_objects_pid = fork();
if (!pack_objects_pid) {
dup2(pipe_fd[0], 0);
dup2(fd, 1);
close(pipe_fd[0]);
close(pipe_fd[1]);
close(fd);
exec_pack_objects();
die("pack-objects setup failed");
}
if (pack_objects_pid < 0)
die("pack-objects fork failed");
dup2(pipe_fd[1], 1);
close(pipe_fd[0]);
close(pipe_fd[1]);
close(fd);
exec_rev_list(refs);
}
static int pack_objects(int fd, struct ref *refs)
{
pid_t rev_list_pid;
rev_list_pid = fork();
if (!rev_list_pid) {
rev_list(fd, refs);
die("rev-list setup failed");
}
if (rev_list_pid < 0)
die("rev-list fork failed");
/*
* We don't wait for the rev-list pipeline in the parent:
* we end up waiting for the other end instead
*/
return 0;
}
static int read_ref(const char *ref, unsigned char *sha1)
{
int fd, ret;
char buffer[60];
fd = open(git_path("%s", ref), O_RDONLY);
if (fd < 0)
return -1;
ret = -1;
if (read(fd, buffer, sizeof(buffer)) >= 40)
ret = get_sha1_hex(buffer, sha1);
close(fd);
return ret;
}
static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
{
struct commit *new, *old;
struct commit_list *list;
if (force_update)
return 1;
old = lookup_commit_reference(old_sha1);
if (!old)
return 0;
new = lookup_commit_reference(new_sha1);
if (!new)
return 0;
if (parse_commit(new) < 0)
return 0;
list = NULL;
commit_list_insert(new, &list);
while (list) {
new = pop_most_recent_commit(&list, 1);
if (new == old)
return 1;
}
return 0;
}
static int local_ref_nr_match;
static char **local_ref_match;
static struct ref *local_ref_list;
static struct ref **local_last_ref;
static int try_to_match(const char *refname, const unsigned char *sha1)
{
struct ref *ref;
int len;
if (!path_match(refname, local_ref_nr_match, local_ref_match)) {
if (!send_all)
return 0;
/* If we have it listed already, skip it */
for (ref = local_ref_list ; ref ; ref = ref->next) {
if (!strcmp(ref->name, refname))
return 0;
}
}
len = strlen(refname)+1;
ref = xmalloc(sizeof(*ref) + len);
memset(ref->old_sha1, 0, 20);
memcpy(ref->new_sha1, sha1, 20);
memcpy(ref->name, refname, len);
ref->next = NULL;
*local_last_ref = ref;
local_last_ref = &ref->next;
return 0;
}
static int send_pack(int in, int out, int nr_match, char **match)
{
struct ref *ref_list, **last_ref;
struct ref *ref;
int new_refs;
/* First we get all heads, whether matching or not.. */
last_ref = get_remote_heads(in, &ref_list, 0, NULL);
/*
* Go through the refs, see if we want to update
* any of them..
*/
for (ref = ref_list; ref; ref = ref->next) {
unsigned char new_sha1[20];
char *name = ref->name;
if (nr_match && !path_match(name, nr_match, match))
continue;
if (read_ref(name, new_sha1) < 0)
continue;
if (!memcmp(ref->old_sha1, new_sha1, 20)) {
fprintf(stderr, "'%s' unchanged\n", name);
continue;
}
if (!has_sha1_file(ref->old_sha1)) {
error("remote '%s' object %s does not exist on local",
name, sha1_to_hex(ref->old_sha1));
continue;
}
if (!ref_newer(new_sha1, ref->old_sha1)) {
error("remote '%s' isn't a strict parent of local", name);
continue;
}
/* Ok, mark it for update */
memcpy(ref->new_sha1, new_sha1, 20);
}
/*
* See if we have any refs that the other end didn't have
*/
if (nr_match || send_all) {
local_ref_nr_match = nr_match;
local_ref_match = match;
local_ref_list = ref_list;
local_last_ref = last_ref;
for_each_ref(try_to_match);
}
/*
* Finally, tell the other end!
*/
new_refs = 0;
for (ref = ref_list; ref; ref = ref->next) {
char old_hex[60], *new_hex;
if (is_zero_sha1(ref->new_sha1))
continue;
new_refs++;
strcpy(old_hex, sha1_to_hex(ref->old_sha1));
new_hex = sha1_to_hex(ref->new_sha1);
packet_write(out, "%s %s %s", old_hex, new_hex, ref->name);
fprintf(stderr, "'%s': updating from %s to %s\n", ref->name, old_hex, new_hex);
}
packet_flush(out);
if (new_refs)
pack_objects(out, ref_list);
close(out);
return 0;
}
int main(int argc, char **argv)
{
int i, nr_heads = 0;
char *dest = NULL;
char **heads = NULL;
int fd[2], ret;
pid_t pid;
argv++;
for (i = 1; i < argc; i++, argv++) {
char *arg = *argv;
if (*arg == '-') {
if (!strncmp(arg, "--exec=", 7)) {
exec = arg + 7;
continue;
}
if (!strcmp(arg, "--all")) {
send_all = 1;
continue;
}
if (!strcmp(arg, "--force")) {
force_update = 1;
continue;
}
usage(send_pack_usage);
}
if (!dest) {
dest = arg;
continue;
}
heads = argv;
nr_heads = argc - i;
break;
}
if (!dest)
usage(send_pack_usage);
if (heads && send_all)
usage(send_pack_usage);
pid = git_connect(fd, dest, exec);
if (pid < 0)
return 1;
ret = send_pack(fd[0], fd[1], nr_heads, heads);
close(fd[0]);
close(fd[1]);
finish_connect(pid);
return ret;
}
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