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-rw-r--r--cmds-receive.c1306
1 files changed, 1306 insertions, 0 deletions
diff --git a/cmds-receive.c b/cmds-receive.c
new file mode 100644
index 00000000..f4a3a4f1
--- /dev/null
+++ b/cmds-receive.c
@@ -0,0 +1,1306 @@
+/*
+ * Copyright (C) 2012 Alexander Block. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include "kerncompat.h"
+#include "androidcompat.h"
+
+#include <unistd.h>
+#include <stdint.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <math.h>
+#include <ftw.h>
+#include <sys/wait.h>
+#include <assert.h>
+#include <getopt.h>
+#include <limits.h>
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
+#include <uuid/uuid.h>
+
+#include "ctree.h"
+#include "ioctl.h"
+#include "commands.h"
+#include "utils.h"
+#include "list.h"
+#include "btrfs-list.h"
+
+#include "send.h"
+#include "send-stream.h"
+#include "send-utils.h"
+
+static int g_verbose = 0;
+
+struct btrfs_receive
+{
+ int mnt_fd;
+ int dest_dir_fd;
+
+ int write_fd;
+ char write_path[PATH_MAX];
+
+ char *root_path;
+ char *dest_dir_path; /* relative to root_path */
+ char full_subvol_path[PATH_MAX];
+ char *full_root_path;
+ int dest_dir_chroot;
+
+ struct subvol_info cur_subvol;
+ /*
+ * Substitute for cur_subvol::path which is a pointer and we cannot
+ * change it to an array as it's a public API.
+ */
+ char cur_subvol_path[PATH_MAX];
+
+ struct subvol_uuid_search sus;
+
+ int honor_end_cmd;
+
+ /*
+ * Buffer to store capabilities from security.capabilities xattr,
+ * usually 20 bytes, but make same room for potentially larger
+ * encodings. Must be set only once per file, denoted by length > 0.
+ */
+ char cached_capabilities[64];
+ int cached_capabilities_len;
+};
+
+static int finish_subvol(struct btrfs_receive *r)
+{
+ int ret;
+ int subvol_fd = -1;
+ struct btrfs_ioctl_received_subvol_args rs_args;
+ char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
+ u64 flags;
+
+ if (r->cur_subvol_path[0] == 0)
+ return 0;
+
+ subvol_fd = openat(r->mnt_fd, r->cur_subvol_path,
+ O_RDONLY | O_NOATIME);
+ if (subvol_fd < 0) {
+ ret = -errno;
+ error("cannot open %s: %s\n",
+ r->cur_subvol_path, strerror(-ret));
+ goto out;
+ }
+
+ memset(&rs_args, 0, sizeof(rs_args));
+ memcpy(rs_args.uuid, r->cur_subvol.received_uuid, BTRFS_UUID_SIZE);
+ rs_args.stransid = r->cur_subvol.stransid;
+
+ if (g_verbose >= 1) {
+ uuid_unparse((u8*)rs_args.uuid, uuid_str);
+ fprintf(stderr, "BTRFS_IOC_SET_RECEIVED_SUBVOL uuid=%s, "
+ "stransid=%llu\n", uuid_str, rs_args.stransid);
+ }
+
+ ret = ioctl(subvol_fd, BTRFS_IOC_SET_RECEIVED_SUBVOL, &rs_args);
+ if (ret < 0) {
+ ret = -errno;
+ error("ioctl BTRFS_IOC_SET_RECEIVED_SUBVOL failed: %s",
+ strerror(-ret));
+ goto out;
+ }
+ r->cur_subvol.rtransid = rs_args.rtransid;
+
+ ret = ioctl(subvol_fd, BTRFS_IOC_SUBVOL_GETFLAGS, &flags);
+ if (ret < 0) {
+ ret = -errno;
+ error("ioctl BTRFS_IOC_SUBVOL_GETFLAGS failed: %s",
+ strerror(-ret));
+ goto out;
+ }
+
+ flags |= BTRFS_SUBVOL_RDONLY;
+
+ ret = ioctl(subvol_fd, BTRFS_IOC_SUBVOL_SETFLAGS, &flags);
+ if (ret < 0) {
+ ret = -errno;
+ error("failed to make subvolume read only: %s",
+ strerror(-ret));
+ goto out;
+ }
+
+ ret = 0;
+
+out:
+ if (r->cur_subvol_path[0]) {
+ r->cur_subvol_path[0] = 0;
+ }
+ if (subvol_fd != -1)
+ close(subvol_fd);
+ return ret;
+}
+
+static int process_subvol(const char *path, const u8 *uuid, u64 ctransid,
+ void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ struct btrfs_ioctl_vol_args args_v1;
+ char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
+
+ ret = finish_subvol(r);
+ if (ret < 0)
+ goto out;
+
+ BUG_ON(r->cur_subvol.path);
+ BUG_ON(r->cur_subvol_path[0]);
+
+ if (*r->dest_dir_path == 0) {
+ strncpy_null(r->cur_subvol_path, path);
+ } else {
+ ret = path_cat_out(r->cur_subvol_path, r->dest_dir_path, path);
+ if (ret < 0) {
+ error("subvol: path invalid: %s\n", path);
+ goto out;
+ }
+ }
+ ret = path_cat3_out(r->full_subvol_path, r->root_path,
+ r->dest_dir_path, path);
+ if (ret < 0) {
+ error("subvol: path invalid: %s", path);
+ goto out;
+ }
+
+ fprintf(stderr, "At subvol %s\n", path);
+
+ memcpy(r->cur_subvol.received_uuid, uuid, BTRFS_UUID_SIZE);
+ r->cur_subvol.stransid = ctransid;
+
+ if (g_verbose) {
+ uuid_unparse((u8*)r->cur_subvol.received_uuid, uuid_str);
+ fprintf(stderr, "receiving subvol %s uuid=%s, stransid=%llu\n",
+ path, uuid_str,
+ r->cur_subvol.stransid);
+ }
+
+ memset(&args_v1, 0, sizeof(args_v1));
+ strncpy_null(args_v1.name, path);
+ ret = ioctl(r->dest_dir_fd, BTRFS_IOC_SUBVOL_CREATE, &args_v1);
+ if (ret < 0) {
+ ret = -errno;
+ error("creating subvolume %s failed: %s", path, strerror(-ret));
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static int process_snapshot(const char *path, const u8 *uuid, u64 ctransid,
+ const u8 *parent_uuid, u64 parent_ctransid,
+ void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char uuid_str[BTRFS_UUID_UNPARSED_SIZE];
+ struct btrfs_ioctl_vol_args_v2 args_v2;
+ struct subvol_info *parent_subvol = NULL;
+
+ ret = finish_subvol(r);
+ if (ret < 0)
+ goto out;
+
+ BUG_ON(r->cur_subvol.path);
+ BUG_ON(r->cur_subvol_path[0]);
+
+ if (*r->dest_dir_path == 0) {
+ strncpy_null(r->cur_subvol_path, path);
+ } else {
+ ret = path_cat_out(r->cur_subvol_path, r->dest_dir_path, path);
+ if (ret < 0) {
+ error("snapshot: path invalid: %s", path);
+ goto out;
+ }
+ }
+ ret = path_cat3_out(r->full_subvol_path, r->root_path,
+ r->dest_dir_path, path);
+ if (ret < 0) {
+ error("snapshot: path invalid: %s", path);
+ goto out;
+ }
+
+ fprintf(stdout, "At snapshot %s\n", path);
+
+ memcpy(r->cur_subvol.received_uuid, uuid, BTRFS_UUID_SIZE);
+ r->cur_subvol.stransid = ctransid;
+
+ if (g_verbose) {
+ uuid_unparse((u8*)r->cur_subvol.received_uuid, uuid_str);
+ fprintf(stderr, "receiving snapshot %s uuid=%s, "
+ "ctransid=%llu ", path, uuid_str,
+ r->cur_subvol.stransid);
+ uuid_unparse(parent_uuid, uuid_str);
+ fprintf(stderr, "parent_uuid=%s, parent_ctransid=%llu\n",
+ uuid_str, parent_ctransid);
+ }
+
+ memset(&args_v2, 0, sizeof(args_v2));
+ strncpy_null(args_v2.name, path);
+
+ parent_subvol = subvol_uuid_search(&r->sus, 0, parent_uuid,
+ parent_ctransid, NULL, subvol_search_by_received_uuid);
+ if (!parent_subvol) {
+ parent_subvol = subvol_uuid_search(&r->sus, 0, parent_uuid,
+ parent_ctransid, NULL, subvol_search_by_uuid);
+ }
+ if (!parent_subvol) {
+ ret = -ENOENT;
+ error("cannot find parent subvolume");
+ goto out;
+ }
+
+ /*
+ * The path is resolved from the root subvol, but we could be in some
+ * subvolume under the root subvolume, so try and adjust the path to be
+ * relative to our root path.
+ */
+ if (r->full_root_path) {
+ size_t root_len;
+ size_t sub_len;
+
+ root_len = strlen(r->full_root_path);
+ sub_len = strlen(parent_subvol->path);
+
+ /* First make sure the parent subvol is actually in our path */
+ if (sub_len < root_len ||
+ strstr(parent_subvol->path, r->full_root_path) == NULL) {
+ error(
+ "parent subvol is not reachable from inside the root subvol");
+ ret = -ENOENT;
+ goto out;
+ }
+
+ if (sub_len == root_len) {
+ parent_subvol->path[0] = '/';
+ parent_subvol->path[1] = '\0';
+ } else {
+ /*
+ * root path is foo/bar
+ * subvol path is foo/bar/baz
+ *
+ * we need to have baz be the path, so we need to move
+ * the bit after foo/bar/, so path + root_len + 1, and
+ * move the part we care about, so sub_len - root_len -
+ * 1.
+ */
+ memmove(parent_subvol->path,
+ parent_subvol->path + root_len + 1,
+ sub_len - root_len - 1);
+ parent_subvol->path[sub_len - root_len - 1] = '\0';
+ }
+ }
+ /*if (rs_args.ctransid > rs_args.rtransid) {
+ if (!r->force) {
+ ret = -EINVAL;
+ fprintf(stderr, "ERROR: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
+ goto out;
+ } else {
+ fprintf(stderr, "WARNING: subvolume %s was modified after it was received.\n", r->subvol_parent_name);
+ }
+ }*/
+
+ if (*parent_subvol->path == 0)
+ args_v2.fd = dup(r->mnt_fd);
+ else
+ args_v2.fd = openat(r->mnt_fd, parent_subvol->path,
+ O_RDONLY | O_NOATIME);
+ if (args_v2.fd < 0) {
+ ret = -errno;
+ if (errno != ENOENT)
+ error("cannot open %s: %s",
+ parent_subvol->path, strerror(-ret));
+ else
+ fprintf(stderr,
+ "It seems that you have changed your default "
+ "subvolume or you specify other subvolume to\n"
+ "mount btrfs, try to remount this btrfs filesystem "
+ "with fs tree, and run btrfs receive again!\n");
+ goto out;
+ }
+
+ ret = ioctl(r->dest_dir_fd, BTRFS_IOC_SNAP_CREATE_V2, &args_v2);
+ close(args_v2.fd);
+ if (ret < 0) {
+ ret = -errno;
+ error("creating snapshot %s -> %s failed: %s",
+ parent_subvol->path, path, strerror(-ret));
+ goto out;
+ }
+
+out:
+ if (parent_subvol) {
+ free(parent_subvol->path);
+ free(parent_subvol);
+ }
+ return ret;
+}
+
+static int process_mkfile(const char *path, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("mkfile: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "mkfile %s\n", path);
+
+ ret = creat(full_path, 0600);
+ if (ret < 0) {
+ ret = -errno;
+ error("mkfile %s failed: %s", path, strerror(-ret));
+ goto out;
+ }
+ close(ret);
+ ret = 0;
+
+out:
+ return ret;
+}
+
+static int process_mkdir(const char *path, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("mkdir: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "mkdir %s\n", path);
+
+ ret = mkdir(full_path, 0700);
+ if (ret < 0) {
+ ret = -errno;
+ error("mkdir %s failed: %s", path, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int process_mknod(const char *path, u64 mode, u64 dev, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("mknod: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "mknod %s mode=%llu, dev=%llu\n",
+ path, mode, dev);
+
+ ret = mknod(full_path, mode & S_IFMT, dev);
+ if (ret < 0) {
+ ret = -errno;
+ error("mknod %s failed: %s", path, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int process_mkfifo(const char *path, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("mkfifo: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "mkfifo %s\n", path);
+
+ ret = mkfifo(full_path, 0600);
+ if (ret < 0) {
+ ret = -errno;
+ error("mkfifo %s failed: %s", path, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int process_mksock(const char *path, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("mksock: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "mksock %s\n", path);
+
+ ret = mknod(full_path, 0600 | S_IFSOCK, 0);
+ if (ret < 0) {
+ ret = -errno;
+ error("mknod %s failed: %s", path, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int process_symlink(const char *path, const char *lnk, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("symlink: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "symlink %s -> %s\n", path, lnk);
+
+ ret = symlink(lnk, full_path);
+ if (ret < 0) {
+ ret = -errno;
+ error("symlink %s -> %s failed: %s", path,
+ lnk, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int process_rename(const char *from, const char *to, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_from[PATH_MAX];
+ char full_to[PATH_MAX];
+
+ ret = path_cat_out(full_from, r->full_subvol_path, from);
+ if (ret < 0) {
+ error("rename: source path invalid: %s", from);
+ goto out;
+ }
+
+ ret = path_cat_out(full_to, r->full_subvol_path, to);
+ if (ret < 0) {
+ error("rename: target path invalid: %s", to);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "rename %s -> %s\n", from, to);
+
+ ret = rename(full_from, full_to);
+ if (ret < 0) {
+ ret = -errno;
+ error("rename %s -> %s failed: %s", from,
+ to, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int process_link(const char *path, const char *lnk, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+ char full_link_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("link: source path invalid: %s", full_path);
+ goto out;
+ }
+
+ ret = path_cat_out(full_link_path, r->full_subvol_path, lnk);
+ if (ret < 0) {
+ error("link: target path invalid: %s", full_link_path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "link %s -> %s\n", path, lnk);
+
+ ret = link(full_link_path, full_path);
+ if (ret < 0) {
+ ret = -errno;
+ error("link %s -> %s failed: %s", path, lnk, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+
+static int process_unlink(const char *path, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("unlink: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "unlink %s\n", path);
+
+ ret = unlink(full_path);
+ if (ret < 0) {
+ ret = -errno;
+ error("unlink %s failed. %s", path, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int process_rmdir(const char *path, void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("rmdir: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "rmdir %s\n", path);
+
+ ret = rmdir(full_path);
+ if (ret < 0) {
+ ret = -errno;
+ error("rmdir %s failed: %s", path, strerror(-ret));
+ }
+
+out:
+ return ret;
+}
+
+static int open_inode_for_write(struct btrfs_receive *r, const char *path)
+{
+ int ret = 0;
+
+ if (r->write_fd != -1) {
+ if (strcmp(r->write_path, path) == 0)
+ goto out;
+ close(r->write_fd);
+ r->write_fd = -1;
+ }
+
+ r->write_fd = open(path, O_RDWR);
+ if (r->write_fd < 0) {
+ ret = -errno;
+ error("cannot open %s: %s", path, strerror(-ret));
+ goto out;
+ }
+ strncpy_null(r->write_path, path);
+
+out:
+ return ret;
+}
+
+static void close_inode_for_write(struct btrfs_receive *r)
+{
+ if(r->write_fd == -1)
+ return;
+
+ close(r->write_fd);
+ r->write_fd = -1;
+ r->write_path[0] = 0;
+}
+
+static int process_write(const char *path, const void *data, u64 offset,
+ u64 len, void *user)
+{
+ int ret = 0;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+ u64 pos = 0;
+ int w;
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("write: path invalid: %s", path);
+ goto out;
+ }
+
+ ret = open_inode_for_write(r, full_path);
+ if (ret < 0)
+ goto out;
+
+ while (pos < len) {
+ w = pwrite(r->write_fd, (char*)data + pos, len - pos,
+ offset + pos);
+ if (w < 0) {
+ ret = -errno;
+ error("writing to %s failed: %s\n",
+ path, strerror(-ret));
+ goto out;
+ }
+ pos += w;
+ }
+
+out:
+ return ret;
+}
+
+static int process_clone(const char *path, u64 offset, u64 len,
+ const u8 *clone_uuid, u64 clone_ctransid,
+ const char *clone_path, u64 clone_offset,
+ void *user)
+{
+ int ret;
+ struct btrfs_receive *r = user;
+ struct btrfs_ioctl_clone_range_args clone_args;
+ struct subvol_info *si = NULL;
+ char full_path[PATH_MAX];
+ char *subvol_path = NULL;
+ char full_clone_path[PATH_MAX];
+ int clone_fd = -1;
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("clone: source path invalid: %s", path);
+ goto out;
+ }
+
+ ret = open_inode_for_write(r, full_path);
+ if (ret < 0)
+ goto out;
+
+ si = subvol_uuid_search(&r->sus, 0, clone_uuid, clone_ctransid, NULL,
+ subvol_search_by_received_uuid);
+ if (!si) {
+ if (memcmp(clone_uuid, r->cur_subvol.received_uuid,
+ BTRFS_UUID_SIZE) == 0) {
+ /* TODO check generation of extent */
+ subvol_path = strdup(r->cur_subvol_path);
+ } else {
+ ret = -ENOENT;
+ error("clone: did not find source subvol");
+ goto out;
+ }
+ } else {
+ /*if (rs_args.ctransid > rs_args.rtransid) {
+ if (!r->force) {
+ ret = -EINVAL;
+ fprintf(stderr, "ERROR: subvolume %s was "
+ "modified after it was "
+ "received.\n",
+ r->subvol_parent_name);
+ goto out;
+ } else {
+ fprintf(stderr, "WARNING: subvolume %s was "
+ "modified after it was "
+ "received.\n",
+ r->subvol_parent_name);
+ }
+ }*/
+ subvol_path = strdup(si->path);
+ }
+
+ ret = path_cat_out(full_clone_path, subvol_path, clone_path);
+ if (ret < 0) {
+ error("clone: target path invalid: %s", clone_path);
+ goto out;
+ }
+
+ clone_fd = openat(r->mnt_fd, full_clone_path, O_RDONLY | O_NOATIME);
+ if (clone_fd < 0) {
+ ret = -errno;
+ error("cannot open %s: %s", full_clone_path, strerror(-ret));
+ goto out;
+ }
+
+ clone_args.src_fd = clone_fd;
+ clone_args.src_offset = clone_offset;
+ clone_args.src_length = len;
+ clone_args.dest_offset = offset;
+ ret = ioctl(r->write_fd, BTRFS_IOC_CLONE_RANGE, &clone_args);
+ if (ret < 0) {
+ ret = -errno;
+ error("failed to clone extents to %s\n%s\n",
+ path, strerror(-ret));
+ goto out;
+ }
+
+out:
+ if (si) {
+ free(si->path);
+ free(si);
+ }
+ free(subvol_path);
+ if (clone_fd != -1)
+ close(clone_fd);
+ return ret;
+}
+
+
+static int process_set_xattr(const char *path, const char *name,
+ const void *data, int len, void *user)
+{
+ int ret = 0;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("set_xattr: path invalid: %s", path);
+ goto out;
+ }
+
+ if (strcmp("security.capability", name) == 0) {
+ if (g_verbose >= 3)
+ fprintf(stderr, "set_xattr: cache capabilities\n");
+ if (r->cached_capabilities_len)
+ warning("capabilities set multiple times per file: %s",
+ full_path);
+ if (len > sizeof(r->cached_capabilities)) {
+ error("capabilities encoded to %d bytes, buffer too small",
+ len);
+ ret = -E2BIG;
+ goto out;
+ }
+ r->cached_capabilities_len = len;
+ memcpy(r->cached_capabilities, data, len);
+ }
+
+ if (g_verbose >= 2) {
+ fprintf(stderr, "set_xattr %s - name=%s data_len=%d "
+ "data=%.*s\n", path, name, len,
+ len, (char*)data);
+ }
+
+ ret = lsetxattr(full_path, name, data, len, 0);
+ if (ret < 0) {
+ ret = -errno;
+ error("lsetxattr %s %s=%.*s failed: %s",
+ path, name, len, (char*)data, strerror(-ret));
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static int process_remove_xattr(const char *path, const char *name, void *user)
+{
+ int ret = 0;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("remove_xattr: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2) {
+ fprintf(stderr, "remove_xattr %s - name=%s\n",
+ path, name);
+ }
+
+ ret = lremovexattr(full_path, name);
+ if (ret < 0) {
+ ret = -errno;
+ error("lremovexattr %s %s failed: %s",
+ path, name, strerror(-ret));
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static int process_truncate(const char *path, u64 size, void *user)
+{
+ int ret = 0;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("truncate: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "truncate %s size=%llu\n", path, size);
+
+ ret = truncate(full_path, size);
+ if (ret < 0) {
+ ret = -errno;
+ error("truncate %s failed: %s", path, strerror(-ret));
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static int process_chmod(const char *path, u64 mode, void *user)
+{
+ int ret = 0;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("chmod: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "chmod %s - mode=0%o\n", path, (int)mode);
+
+ ret = chmod(full_path, mode);
+ if (ret < 0) {
+ ret = -errno;
+ error("chmod %s failed: %s", path, strerror(-ret));
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static int process_chown(const char *path, u64 uid, u64 gid, void *user)
+{
+ int ret = 0;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("chown: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "chown %s - uid=%llu, gid=%llu\n", path,
+ uid, gid);
+
+ ret = lchown(full_path, uid, gid);
+ if (ret < 0) {
+ ret = -errno;
+ error("chown %s failed: %s", path, strerror(-ret));
+ goto out;
+ }
+
+ if (r->cached_capabilities_len) {
+ if (g_verbose >= 2)
+ fprintf(stderr, "chown: restore capabilities\n");
+ ret = lsetxattr(full_path, "security.capability",
+ r->cached_capabilities,
+ r->cached_capabilities_len, 0);
+ memset(r->cached_capabilities, 0,
+ sizeof(r->cached_capabilities));
+ r->cached_capabilities_len = 0;
+ if (ret < 0) {
+ ret = -errno;
+ error("restoring capabilities %s: %s",
+ path, strerror(-ret));
+ goto out;
+ }
+ }
+
+out:
+ return ret;
+}
+
+static int process_utimes(const char *path, struct timespec *at,
+ struct timespec *mt, struct timespec *ct,
+ void *user)
+{
+ int ret = 0;
+ struct btrfs_receive *r = user;
+ char full_path[PATH_MAX];
+ struct timespec tv[2];
+
+ ret = path_cat_out(full_path, r->full_subvol_path, path);
+ if (ret < 0) {
+ error("utimes: path invalid: %s", path);
+ goto out;
+ }
+
+ if (g_verbose >= 2)
+ fprintf(stderr, "utimes %s\n", path);
+
+ tv[0] = *at;
+ tv[1] = *mt;
+ ret = utimensat(AT_FDCWD, full_path, tv, AT_SYMLINK_NOFOLLOW);
+ if (ret < 0) {
+ ret = -errno;
+ error("utimes %s failed: %s",
+ path, strerror(-ret));
+ goto out;
+ }
+
+out:
+ return ret;
+}
+
+static int process_update_extent(const char *path, u64 offset, u64 len,
+ void *user)
+{
+ if (g_verbose >= 2)
+ fprintf(stderr, "update_extent %s: offset=%llu, len=%llu\n",
+ path, (unsigned long long)offset,
+ (unsigned long long)len);
+
+ /*
+ * Sent with BTRFS_SEND_FLAG_NO_FILE_DATA, nothing to do.
+ */
+
+ return 0;
+}
+
+static struct btrfs_send_ops send_ops = {
+ .subvol = process_subvol,
+ .snapshot = process_snapshot,
+ .mkfile = process_mkfile,
+ .mkdir = process_mkdir,
+ .mknod = process_mknod,
+ .mkfifo = process_mkfifo,
+ .mksock = process_mksock,
+ .symlink = process_symlink,
+ .rename = process_rename,
+ .link = process_link,
+ .unlink = process_unlink,
+ .rmdir = process_rmdir,
+ .write = process_write,
+ .clone = process_clone,
+ .set_xattr = process_set_xattr,
+ .remove_xattr = process_remove_xattr,
+ .truncate = process_truncate,
+ .chmod = process_chmod,
+ .chown = process_chown,
+ .utimes = process_utimes,
+ .update_extent = process_update_extent,
+};
+
+static int do_receive(struct btrfs_receive *r, const char *tomnt,
+ char *realmnt, int r_fd, u64 max_errors)
+{
+ u64 subvol_id;
+ int ret;
+ char *dest_dir_full_path;
+ char root_subvol_path[PATH_MAX];
+ int end = 0;
+
+ dest_dir_full_path = realpath(tomnt, NULL);
+ if (!dest_dir_full_path) {
+ ret = -errno;
+ error("realpath(%s) failed: %s", tomnt, strerror(-ret));
+ goto out;
+ }
+ r->dest_dir_fd = open(dest_dir_full_path, O_RDONLY | O_NOATIME);
+ if (r->dest_dir_fd < 0) {
+ ret = -errno;
+ error("cannot open destination directory %s: %s",
+ dest_dir_full_path, strerror(-ret));
+ goto out;
+ }
+
+ if (realmnt[0]) {
+ r->root_path = realmnt;
+ } else {
+ ret = find_mount_root(dest_dir_full_path, &r->root_path);
+ if (ret < 0) {
+ error("failed to determine mount point for %s: %s",
+ dest_dir_full_path, strerror(-ret));
+ ret = -EINVAL;
+ goto out;
+ }
+ if (ret > 0) {
+ error("%s doesn't belong to btrfs mount point",
+ dest_dir_full_path);
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+ r->mnt_fd = open(r->root_path, O_RDONLY | O_NOATIME);
+ if (r->mnt_fd < 0) {
+ ret = -errno;
+ error("cannot open %s: %s", r->root_path, strerror(-ret));
+ goto out;
+ }
+
+ /*
+ * If we use -m or a default subvol we want to resolve the path to the
+ * subvolume we're sitting in so that we can adjust the paths of any
+ * subvols we want to receive in.
+ */
+ ret = btrfs_list_get_path_rootid(r->mnt_fd, &subvol_id);
+ if (ret) {
+ error("cannot resolve our subvolid: %d",
+ ret);
+ goto out;
+ }
+
+ root_subvol_path[0] = 0;
+ ret = btrfs_subvolid_resolve(r->mnt_fd, root_subvol_path,
+ PATH_MAX, subvol_id);
+ if (ret) {
+ error("cannot resolve our subvol path");
+ goto out;
+ }
+
+ /*
+ * Ok we're inside of a subvol off of the root subvol, we need to
+ * actually set full_root_path.
+ */
+ if (*root_subvol_path)
+ r->full_root_path = root_subvol_path;
+
+ if (r->dest_dir_chroot) {
+ if (chroot(dest_dir_full_path)) {
+ ret = -errno;
+ error("failed to chroot to %s: %s",
+ dest_dir_full_path, strerror(-ret));
+ goto out;
+ }
+ if (chdir("/")) {
+ ret = -errno;
+ error("failed to chdir to / after chroot: %s",
+ strerror(-ret));
+ goto out;
+ }
+ fprintf(stderr, "Chroot to %s\n", dest_dir_full_path);
+ r->root_path = strdup("/");
+ r->dest_dir_path = r->root_path;
+ } else {
+ /*
+ * find_mount_root returns a root_path that is a subpath of
+ * dest_dir_full_path. Now get the other part of root_path,
+ * which is the destination dir relative to root_path.
+ */
+ r->dest_dir_path = dest_dir_full_path + strlen(r->root_path);
+ while (r->dest_dir_path[0] == '/')
+ r->dest_dir_path++;
+ }
+
+ ret = subvol_uuid_search_init(r->mnt_fd, &r->sus);
+ if (ret < 0)
+ goto out;
+
+ while (!end) {
+ if (r->cached_capabilities_len) {
+ if (g_verbose >= 3)
+ fprintf(stderr, "clear cached capabilities\n");
+ memset(r->cached_capabilities, 0,
+ sizeof(r->cached_capabilities));
+ r->cached_capabilities_len = 0;
+ }
+
+ ret = btrfs_read_and_process_send_stream(r_fd, &send_ops, r,
+ r->honor_end_cmd,
+ max_errors);
+ if (ret < 0)
+ goto out;
+ if (ret)
+ end = 1;
+
+ close_inode_for_write(r);
+ ret = finish_subvol(r);
+ if (ret < 0)
+ goto out;
+ }
+ ret = 0;
+
+out:
+ if (r->write_fd != -1) {
+ close(r->write_fd);
+ r->write_fd = -1;
+ }
+
+ if (r->root_path != realmnt)
+ free(r->root_path);
+ r->root_path = NULL;
+ r->dest_dir_path = NULL;
+ free(dest_dir_full_path);
+ subvol_uuid_search_finit(&r->sus);
+ if (r->mnt_fd != -1) {
+ close(r->mnt_fd);
+ r->mnt_fd = -1;
+ }
+ if (r->dest_dir_fd != -1) {
+ close(r->dest_dir_fd);
+ r->dest_dir_fd = -1;
+ }
+
+ return ret;
+}
+
+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;
+}
+
+const char * const cmd_receive_usage[] = {
+ "btrfs receive [-ve] [-f <infile>] [--max-errors <N>] <mount>",
+ "Receive subvolumes from stdin.",
+ "Receives one or more subvolumes that were previously",
+ "sent with btrfs send. The received subvolumes are stored",
+ "into <mount>.",
+ "btrfs receive will fail in case a receiving subvolume",
+ "already exists. It will also fail in case a previously",
+ "received subvolume was changed after it was received.",
+ "After receiving a subvolume, it is immediately set to",
+ "read only.\n",
+ "-v Enable verbose debug output. Each",
+ " occurrence of this option increases the",
+ " verbose level more.",
+ "-f <infile> By default, btrfs receive uses stdin",
+ " to receive the subvolumes. Use this",
+ " option to specify a file to use instead.",
+ "-e Terminate after receiving an <end cmd>",
+ " in the data stream. Without this option,",
+ " the receiver terminates only if an error",
+ " is recognized or on EOF.",
+ "-C|--chroot confine the process to <mount> using chroot",
+ "--max-errors <N> Terminate as soon as N errors happened while",
+ " processing commands from the send stream.",
+ " Default value is 1. A value of 0 means no limit.",
+ "-m <mountpoint> The root mount point of the destination fs.",
+ " If you do not have /proc use this to tell us where ",
+ " this file system is mounted.",
+ NULL
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-24 14:59:20 +0000