Function main

gossipd/compactd.c:95–154

}

int main(int argc, char *argv[])
{
	int oldfd, newfd;
	u8 gsversion, byte;
	u8 uuid[32];
	u64 old_off, limit;

	common_setup(argv[0]);
	/* Not really a subdaemon (we don't use status_xxx) but we can pretend */
	if (argc == 2 && streq(argv[1], "--version")) {
		printf("%s\n", version());
		exit(0);
	}

	if (argc != 5)
		errx(1, "Usage: %s <oldstore> <newstore> <oldstorelen> <uuid>",
			argv[0]);

	oldfd = open(argv[1], O_RDONLY);
	if (oldfd < 0)
		err(1, "Could not open old gossip_store %s", argv[1]);
	newfd = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0600);
	if (newfd < 0)
		err(1, "Could not open new gossip_store %s", argv[2]);
	limit = atol(argv[3]);
	if (!hex_decode(argv[4], strlen(argv[4]), uuid, sizeof(uuid)))
		errx(1, "Invalid uuid %s", argv[1]);

	/* Copy version byte */
	old_off = readx(oldfd, &gsversion, sizeof(gsversion));
	writex(newfd, &gsversion, sizeof(gsversion));

	/* Create uuid hdr. */
	writerec(newfd, towire_gossip_store_uuid(tmpctx, uuid));

	old_off = copy_records(oldfd, newfd, old_off, limit, false);
	/* We should hit limit exactly */
	if (old_off != limit)
		errx(1, "We reached offset %"PRIu64" past initial limit %"PRIu64,
		     old_off, limit);

	/* Now we tell gossipd we're done, and it pauses while we copy the last bit.
	 * Note that we need to keep any "delete_channel" records here, since that
	 * would have happened since we copied the first part, and we might have
	 * missed the deleted bit on those channels. */
	byte = 0;
	writex(STDOUT_FILENO, &byte, sizeof(byte));
	readx(STDIN_FILENO, &byte, sizeof(byte));

	limit = lseek(oldfd, 0, SEEK_END);
	lseek(oldfd, old_off, SEEK_SET);
	old_off = copy_records(oldfd, newfd, old_off, limit, true);

	/* We should hit EOF exactly */
	if (old_off != limit)
		errx(1, "We reached offset %"PRIu64" before file size %"PRIu64,
		     old_off, limit);