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tag: v1.5.2.1
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#include "cache.h"
#include "commit.h"
#include "tag.h"
#include "refs.h"
#include "pkt-line.h"
#include "run-command.h"

static const char send_pack_usage[] =
"git-send-pack [--all] [--force] [--receive-pack=<git-receive-pack>] [--verbose] [--thin] [<host>:]<directory> [<ref>...]\n"
" --all and explicit <ref> specification are mutually exclusive.";
static const char *receivepack = "git-receive-pack";
static int verbose;
static int send_all;
static int force_update;
static int use_thin_pack;

/*
* Make a pack stream and spit it out into file descriptor fd
*/
static int pack_objects(int fd, struct ref *refs)
{
/*
* The child becomes pack-objects --revs; we feed
* the revision parameters to it via its stdin and
* let its stdout go back to the other end.
*/
const char *args[] = {
"pack-objects",
"--all-progress",
"--revs",
"--stdout",
NULL,
NULL,
};
struct child_process po;

if (use_thin_pack)
args[4] = "--thin";
memset(&po, 0, sizeof(po));
po.argv = args;
po.in = -1;
po.out = fd;
po.git_cmd = 1;
if (start_command(&po))
die("git-pack-objects failed (%s)", strerror(errno));

/*
* We feed the pack-objects we just spawned with revision
* parameters by writing to the pipe.
*/
while (refs) {
char buf[42];

if (!is_null_sha1(refs->old_sha1) &&
has_sha1_file(refs->old_sha1)) {
memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
buf[0] = '^';
buf[41] = '\n';
if (!write_or_whine(po.in, buf, 42,
"send-pack: send refs"))
break;
}
if (!is_null_sha1(refs->new_sha1)) {
memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
buf[40] = '\n';
if (!write_or_whine(po.in, buf, 41,
"send-pack: send refs"))
break;
}
refs = refs->next;
}

if (finish_command(&po))
return error("pack-objects died with strange error");
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), NULL, 0);
if (!o || o->type != OBJ_COMMIT)
return 0;
old = (struct commit *) o;

o = deref_tag(parse_object(new_sha1), NULL, 0);
if (!o || o->type != OBJ_COMMIT)
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, int flag, void *cb_data)
{
struct ref *ref;
int len = strlen(refname) + 1;
ref = xcalloc(1, sizeof(*ref) + len);
hashcpy(ref->new_sha1, sha1);
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, NULL);
}

static int receive_status(int in)
{
char line[1000];
int ret = 0;
int len = packet_read_line(in, line, sizeof(line));
if (len < 10 || memcmp(line, "unpack ", 7)) {
fprintf(stderr, "did not receive status back\n");
return -1;
}
if (memcmp(line, "unpack ok\n", 10)) {
fputs(line, stderr);
ret = -1;
}
while (1) {
len = packet_read_line(in, line, sizeof(line));
if (!len)
break;
if (len < 3 ||
(memcmp(line, "ok", 2) && memcmp(line, "ng", 2))) {
fprintf(stderr, "protocol error: %s\n", line);
ret = -1;
break;
}
if (!memcmp(line, "ok", 2))
continue;
fputs(line, stderr);
ret = -1;
}
return ret;
}

static int send_pack(int in, int out, int nr_refspec, char **refspec)
{
struct ref *ref;
int new_refs;
int ret = 0;
int ask_for_status_report = 0;
int allow_deleting_refs = 0;
int expect_status_report = 0;

/* No funny business with the matcher */
remote_tail = get_remote_heads(in, &remote_refs, 0, NULL, REF_NORMAL);
get_local_heads();

/* Does the other end support the reporting? */
if (server_supports("report-status"))
ask_for_status_report = 1;
if (server_supports("delete-refs"))
allow_deleting_refs = 1;

/* 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;

if (!remote_refs) {
fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
return 0;
}

/*
* Finally, tell the other end!
*/
new_refs = 0;
for (ref = remote_refs; ref; ref = ref->next) {
char old_hex[60], *new_hex;
int delete_ref;

if (!ref->peer_ref)
continue;

delete_ref = is_null_sha1(ref->peer_ref->new_sha1);
if (delete_ref && !allow_deleting_refs) {
error("remote does not support deleting refs");
ret = -2;
continue;
}
if (!delete_ref &&
!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
if (verbose)
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.
*
* (4) regardless of all of the above, removing :B is
* always allowed.
*/

if (!force_update &&
!delete_ref &&
!is_null_sha1(ref->old_sha1) &&
!ref->force) {
if (!has_sha1_file(ref->old_sha1) ||
!ref_newer(ref->peer_ref->new_sha1,
ref->old_sha1)) {
/* We do not have the remote ref, or
* we know that the remote ref is not
* an ancestor of what we are trying to
* push. Either way this can be losing
* commits at the remote end and likely
* we were not up to date to begin with.
*/
error("remote '%s' is not a strict "
"subset of local ref '%s'. "
"maybe you are not up-to-date and "
"need to pull first?",
ref->name,
ref->peer_ref->name);
ret = -2;
continue;
}
}
hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
if (!delete_ref)
new_refs++;
strcpy(old_hex, sha1_to_hex(ref->old_sha1));
new_hex = sha1_to_hex(ref->new_sha1);

if (ask_for_status_report) {
packet_write(out, "%s %s %s%c%s",
old_hex, new_hex, ref->name, 0,
"report-status");
ask_for_status_report = 0;
expect_status_report = 1;
}
else
packet_write(out, "%s %s %s",
old_hex, new_hex, ref->name);
if (delete_ref)
fprintf(stderr, "deleting '%s'\n", ref->name);
else {
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)
ret = pack_objects(out, remote_refs);
close(out);

if (expect_status_report) {
if (receive_status(in))
ret = -4;
}

if (!new_refs && ret == 0)
fprintf(stderr, "Everything up-to-date\n");
return ret;
}

static void verify_remote_names(int nr_heads, char **heads)
{
int i;

for (i = 0; i < nr_heads; i++) {
const char *remote = strchr(heads[i], ':');

remote = remote ? (remote + 1) : heads[i];
switch (check_ref_format(remote)) {
case 0: /* ok */
case -2: /* ok but a single level -- that is fine for
* a match pattern.
*/
continue;
}
die("remote part of refspec is not a valid name in %s",
heads[i]);
}
}

int main(int argc, char **argv)
{
int i, nr_heads = 0;
char *dest = NULL;
char **heads = NULL;
int fd[2], ret;
pid_t pid;

setup_git_directory();
git_config(git_default_config);

argv++;
for (i = 1; i < argc; i++, argv++) {
char *arg = *argv;

if (*arg == '-') {
if (!prefixcmp(arg, "--receive-pack=")) {
receivepack = arg + 15;
continue;
}
if (!prefixcmp(arg, "--exec=")) {
receivepack = arg + 7;
continue;
}
if (!strcmp(arg, "--all")) {
send_all = 1;
continue;
}
if (!strcmp(arg, "--force")) {
force_update = 1;
continue;
}
if (!strcmp(arg, "--verbose")) {
verbose = 1;
continue;
}
if (!strcmp(arg, "--thin")) {
use_thin_pack = 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);
verify_remote_names(nr_heads, heads);

pid = git_connect(fd, dest, receivepack);
if (pid < 0)
return 1;
ret = send_pack(fd[0], fd[1], nr_heads, heads);
close(fd[0]);
close(fd[1]);
ret |= finish_connect(pid);
return !!ret;
}
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