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path: root/send-pack.c
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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 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 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 (!is_zero_sha1(ref->old_sha1)) {
			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;
			}
			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;
			}
		}
		if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
			fprintf(stderr, "'%s': up-to-date\n", 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;
}