int cmd_receive(int argc, char **argv)
{
char *tomnt = NULL;
char fromfile[PATH_MAX];
char realmnt[PATH_MAX];
struct btrfs_receive r;
int receive_fd = fileno(stdin);
u64 max_errors = 1;
int ret = 0;
memset(&r, 0, sizeof(r));
r.mnt_fd = -1;
r.write_fd = -1;
r.dest_dir_fd = -1;
r.dest_dir_chroot = 0;
realmnt[0] = 0;
fromfile[0] = 0;
while (1) {
int c;
static const struct option long_opts[] = {
{ "max-errors", required_argument, NULL, 'E' },
{ "chroot", no_argument, NULL, 'C' },
{ NULL, 0, NULL, 0 }
};
c = getopt_long(argc, argv, "Cevf:m:", long_opts, NULL);
if (c < 0)
break;
switch (c) {
case 'v':
g_verbose++;
break;
case 'f':
if (arg_copy_path(fromfile, optarg, sizeof(fromfile))) {
error("input file path too long (%zu)",
strlen(optarg));
ret = 1;
goto out;
}
break;
case 'e':
r.honor_end_cmd = 1;
break;
case 'C':
r.dest_dir_chroot = 1;
break;
case 'E':
max_errors = arg_strtou64(optarg);
break;
case 'm':
if (arg_copy_path(realmnt, optarg, sizeof(realmnt))) {
error("mount point path too long (%zu)",
strlen(optarg));
ret = 1;
goto out;
}
break;
case '?':
default:
error("receive args invalid");
return 1;
}
}
if (check_argc_exact(argc - optind, 1))
usage(cmd_receive_usage);
tomnt = argv[optind];
if (fromfile[0]) {
receive_fd = open(fromfile, O_RDONLY | O_NOATIME);
if (receive_fd < 0) {
error("cannot open %s: %s", fromfile, strerror(errno));
goto out;
}
}
ret = do_receive(&r, tomnt, realmnt, receive_fd, max_errors);
if (receive_fd != fileno(stdin))
close(receive_fd);
out:
return !!ret;
}
int cmd_send(int argc, char **argv)
{
char *subvol = NULL;
int ret;
char outname[PATH_MAX];
struct btrfs_send send;
u32 i;
char *mount_root = NULL;
char *snapshot_parent = NULL;
u64 root_id = 0;
u64 parent_root_id = 0;
int full_send = 1;
int new_end_cmd_semantic = 0;
u64 send_flags = 0;
memset(&send, 0, sizeof(send));
send.dump_fd = fileno(stdout);
outname[0] = 0;
while (1) {
enum { GETOPT_VAL_SEND_NO_DATA = 256 };
static const struct option long_options[] = {
{ "verbose", no_argument, NULL, 'v' },
{ "quiet", no_argument, NULL, 'q' },
{ "no-data", no_argument, NULL, GETOPT_VAL_SEND_NO_DATA }
};
int c = getopt_long(argc, argv, "vqec:f:i:p:", long_options, NULL);
if (c < 0)
break;
switch (c) {
case 'v':
g_verbose++;
break;
case 'q':
g_verbose = 0;
break;
case 'e':
new_end_cmd_semantic = 1;
break;
case 'c':
subvol = realpath(optarg, NULL);
if (!subvol) {
ret = -errno;
error("realpath %s failed: %s\n", optarg, strerror(-ret));
goto out;
}
ret = set_root_info(&send, subvol, &root_id);
if (ret < 0)
goto out;
ret = is_subvol_ro(&send, subvol);
if (ret < 0)
goto out;
if (!ret) {
ret = -EINVAL;
error("cloned subvolume %s is not read-only", subvol);
goto out;
}
ret = add_clone_source(&send, root_id);
if (ret < 0) {
error("cannot add clone source: %s", strerror(-ret));
goto out;
}
free(subvol);
subvol = NULL;
free_send_info(&send);
full_send = 0;
break;
case 'f':
if (arg_copy_path(outname, optarg, sizeof(outname))) {
error("output file path too long (%zu)", strlen(optarg));
ret = 1;
goto out;
}
break;
case 'p':
if (snapshot_parent) {
error("you cannot have more than one parent (-p)");
ret = 1;
goto out;
}
snapshot_parent = realpath(optarg, NULL);
if (!snapshot_parent) {
ret = -errno;
error("realpath %s failed: %s", optarg, strerror(-ret));
goto out;
}
ret = is_subvol_ro(&send, snapshot_parent);
if (ret < 0)
goto out;
if (!ret) {
ret = -EINVAL;
error("parent subvolume %s is not read-only",
snapshot_parent);
goto out;
}
full_send = 0;
break;
case 'i':
error("option -i was removed, use -c instead");
ret = 1;
goto out;
case GETOPT_VAL_SEND_NO_DATA:
send_flags |= BTRFS_SEND_FLAG_NO_FILE_DATA;
break;
case '?':
default:
error("send arguments invalid");
ret = 1;
goto out;
}
}
if (check_argc_min(argc - optind, 1))
usage(cmd_send_usage);
if (outname[0]) {
int tmpfd;
/*
* Try to use an existing file first. Even if send runs as
* root, it might not have permissions to create file (eg. on a
* NFS) but it should still be able to use a pre-created file.
*/
tmpfd = open(outname, O_WRONLY | O_TRUNC);
if (tmpfd < 0) {
if (errno == ENOENT)
tmpfd = open(outname,
O_CREAT | O_WRONLY | O_TRUNC, 0600);
}
send.dump_fd = tmpfd;
if (send.dump_fd == -1) {
ret = -errno;
error("cannot create '%s': %s", outname, strerror(-ret));
goto out;
}
}
if (isatty(send.dump_fd)) {
error(
"not dumping send stream into a terminal, redirect it into a file");
ret = 1;
goto out;
}
/* use first send subvol to determine mount_root */
subvol = realpath(argv[optind], NULL);
if (!subvol) {
ret = -errno;
error("unable to resolve %s", argv[optind]);
goto out;
}
ret = init_root_path(&send, subvol);
if (ret < 0)
goto out;
if (snapshot_parent != NULL) {
ret = get_root_id(&send,
subvol_strip_mountpoint(send.root_path, snapshot_parent),
&parent_root_id);
if (ret < 0) {
error("could not resolve rootid for %s", snapshot_parent);
goto out;
}
ret = add_clone_source(&send, parent_root_id);
if (ret < 0) {
error("cannot add clone source: %s", strerror(-ret));
goto out;
}
}
for (i = optind; i < argc; i++) {
free(subvol);
subvol = realpath(argv[i], NULL);
if (!subvol) {
ret = -errno;
error("unable to resolve %s", argv[i]);
goto out;
}
ret = find_mount_root(subvol, &mount_root);
if (ret < 0) {
error("find_mount_root failed on %s: %s", subvol,
strerror(-ret));
goto out;
}
if (ret > 0) {
error("%s does not belong to btrfs mount point",
subvol);
ret = -EINVAL;
goto out;
}
if (strcmp(send.root_path, mount_root) != 0) {
ret = -EINVAL;
error("all subvolumes must be from the same filesystem");
goto out;
}
free(mount_root);
ret = is_subvol_ro(&send, subvol);
if (ret < 0)
goto out;
if (!ret) {
ret = -EINVAL;
error("subvolume %s is not read-only", subvol);
goto out;
}
}
if ((send_flags & BTRFS_SEND_FLAG_NO_FILE_DATA) && g_verbose > 1)
if (g_verbose > 1)
fprintf(stderr, "Mode NO_FILE_DATA enabled\n");
for (i = optind; i < argc; i++) {
int is_first_subvol;
int is_last_subvol;
free(subvol);
subvol = argv[i];
if (g_verbose > 0)
fprintf(stderr, "At subvol %s\n", subvol);
subvol = realpath(subvol, NULL);
if (!subvol) {
ret = -errno;
error("realpath %s failed: %s", argv[i], strerror(-ret));
goto out;
}
if (!full_send && !snapshot_parent) {
ret = set_root_info(&send, subvol, &root_id);
if (ret < 0)
goto out;
ret = find_good_parent(&send, root_id, &parent_root_id);
if (ret < 0) {
error("parent determination failed for %lld",
root_id);
goto out;
}
}
if (new_end_cmd_semantic) {
/* require new kernel */
is_first_subvol = (i == optind);
is_last_subvol = (i == argc - 1);
} else {
/* be compatible to old and new kernel */
is_first_subvol = 1;
is_last_subvol = 1;
}
ret = do_send(&send, parent_root_id, is_first_subvol,
is_last_subvol, subvol, send_flags);
if (ret < 0)
goto out;
if (!full_send && !snapshot_parent) {
/* done with this subvol, so add it to the clone sources */
ret = add_clone_source(&send, root_id);
if (ret < 0) {
error("cannot add clone source: %s", strerror(-ret));
goto out;
}
free_send_info(&send);
}
}
ret = 0;
out:
free(subvol);
free(snapshot_parent);
free(send.clone_sources);
free_send_info(&send);
return !!ret;
}
