mirror of
https://github.com/git/git
synced 2024-10-28 19:25:47 +00:00
315 lines
7 KiB
C
315 lines
7 KiB
C
#include "cache.h"
|
|
#include "commit.h"
|
|
#include "tag.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 void unmark_and_free(struct commit_list *list, unsigned int mark)
|
|
{
|
|
while (list) {
|
|
struct commit_list *temp = list;
|
|
temp->item->object.flags &= ~mark;
|
|
list = temp->next;
|
|
free(temp);
|
|
}
|
|
}
|
|
|
|
static int ref_newer(const unsigned char *new_sha1,
|
|
const unsigned char *old_sha1)
|
|
{
|
|
struct object *o;
|
|
struct commit *old, *new;
|
|
struct commit_list *list, *used;
|
|
int found = 0;
|
|
|
|
/* Both new and old must be commit-ish and new is descendant of
|
|
* old. Otherwise we require --force.
|
|
*/
|
|
o = deref_tag(parse_object(old_sha1));
|
|
if (!o || o->type != commit_type)
|
|
return 0;
|
|
old = (struct commit *) o;
|
|
|
|
o = deref_tag(parse_object(new_sha1));
|
|
if (!o || o->type != commit_type)
|
|
return 0;
|
|
new = (struct commit *) o;
|
|
|
|
if (parse_commit(new) < 0)
|
|
return 0;
|
|
|
|
used = list = NULL;
|
|
commit_list_insert(new, &list);
|
|
while (list) {
|
|
new = pop_most_recent_commit(&list, 1);
|
|
commit_list_insert(new, &used);
|
|
if (new == old) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
}
|
|
unmark_and_free(list, 1);
|
|
unmark_and_free(used, 1);
|
|
return found;
|
|
}
|
|
|
|
static struct ref *local_refs, **local_tail;
|
|
static struct ref *remote_refs, **remote_tail;
|
|
|
|
static int one_local_ref(const char *refname, const unsigned char *sha1)
|
|
{
|
|
struct ref *ref;
|
|
int len = strlen(refname) + 1;
|
|
ref = xcalloc(1, sizeof(*ref) + len);
|
|
memcpy(ref->new_sha1, sha1, 20);
|
|
memcpy(ref->name, refname, len);
|
|
*local_tail = ref;
|
|
local_tail = &ref->next;
|
|
return 0;
|
|
}
|
|
|
|
static void get_local_heads(void)
|
|
{
|
|
local_tail = &local_refs;
|
|
for_each_ref(one_local_ref);
|
|
}
|
|
|
|
static int send_pack(int in, int out, int nr_refspec, char **refspec)
|
|
{
|
|
struct ref *ref;
|
|
int new_refs;
|
|
|
|
/* No funny business with the matcher */
|
|
remote_tail = get_remote_heads(in, &remote_refs, 0, NULL);
|
|
get_local_heads();
|
|
|
|
/* match them up */
|
|
if (!remote_tail)
|
|
remote_tail = &remote_refs;
|
|
if (match_refs(local_refs, remote_refs, &remote_tail,
|
|
nr_refspec, refspec, send_all))
|
|
return -1;
|
|
/*
|
|
* Finally, tell the other end!
|
|
*/
|
|
new_refs = 0;
|
|
for (ref = remote_refs; ref; ref = ref->next) {
|
|
char old_hex[60], *new_hex;
|
|
if (!ref->peer_ref)
|
|
continue;
|
|
if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
|
|
fprintf(stderr, "'%s': up-to-date\n", ref->name);
|
|
continue;
|
|
}
|
|
|
|
/* This part determines what can overwrite what.
|
|
* The rules are:
|
|
*
|
|
* (0) you can always use --force or +A:B notation to
|
|
* selectively force individual ref pairs.
|
|
*
|
|
* (1) if the old thing does not exist, it is OK.
|
|
*
|
|
* (2) if you do not have the old thing, you are not allowed
|
|
* to overwrite it; you would not know what you are losing
|
|
* otherwise.
|
|
*
|
|
* (3) if both new and old are commit-ish, and new is a
|
|
* descendant of old, it is OK.
|
|
*/
|
|
|
|
if (!force_update &&
|
|
!is_zero_sha1(ref->old_sha1) &&
|
|
!ref->force) {
|
|
if (!has_sha1_file(ref->old_sha1)) {
|
|
error("remote '%s' object %s does not "
|
|
"exist on local",
|
|
ref->name, sha1_to_hex(ref->old_sha1));
|
|
continue;
|
|
}
|
|
|
|
/* We assume that local is fsck-clean. Otherwise
|
|
* you _could_ have an old tag which points at
|
|
* something you do not have, which may or may not
|
|
* be a commit.
|
|
*/
|
|
if (!ref_newer(ref->peer_ref->new_sha1,
|
|
ref->old_sha1)) {
|
|
error("remote ref '%s' is not a strict "
|
|
"subset of local ref '%s'.", ref->name,
|
|
ref->peer_ref->name);
|
|
continue;
|
|
}
|
|
}
|
|
memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
|
|
if (is_zero_sha1(ref->new_sha1)) {
|
|
error("cannot happen anymore");
|
|
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, "updating '%s'", ref->name);
|
|
if (strcmp(ref->name, ref->peer_ref->name))
|
|
fprintf(stderr, " using '%s'", ref->peer_ref->name);
|
|
fprintf(stderr, "\n from %s\n to %s\n", old_hex, new_hex);
|
|
}
|
|
|
|
packet_flush(out);
|
|
if (new_refs)
|
|
pack_objects(out, remote_refs);
|
|
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;
|
|
}
|