Provided by: btrfs-progs_5.2.1-1ubuntu1_amd64 bug

NAME

       btrfs-receive - receive subvolumes from send stream

SYNOPSIS

       btrfs receive [options] <path>

       or

       btrfs receive --dump [options]

DESCRIPTION

       Receive a stream of changes and replicate one or more subvolumes that were previously
       generated by btrfs send. The received subvolumes are stored to path, unless --dump option
       is given.

       If --dump option is specified, btrfs receive will only do the validation of the stream,
       and print the stream metadata, one operation per line.

       btrfs receive will fail in the following cases:

        1. receiving subvolume already exists

        2. previously received subvolume has been changed after it was received

        3. default subvolume has changed or you didn’t mount the filesystem at the toplevel
           subvolume

       A subvolume is made read-only after the receiving process finishes successfully (see BUGS
       below).

       Options

       -v
           increase verbosity about performed actions, print details about each operation

       -q|--quiet
           suppress all messages except errors

       -f <FILE>
           read the stream from <FILE> instead of stdin,

       -C|--chroot
           confine the process to path using chroot(1)

       -e
           terminate after receiving an end cmd marker in the stream.

           Without this option the receiver side terminates only in case of an error on end of
           file.

       -E|--max-errors <NERR>
           terminate as soon as NERR errors occur while stream processing commands from the
           stream

           Default value is 1. A value of 0 means no limit.

       -m <ROOTMOUNT>
           the root mount point of the destination filesystem

           By default the mountpoint is searched in /proc/self/mounts. If /proc is not
           accessible, eg. in a chroot environment, use this option to tell us where this
           filesystem is mounted.

       --dump
           dump the stream metadata, one line per operation

           Does not require the path parameter. The filesystem remains unchanged.

BUGS

       btrfs receive sets the subvolume read-only after it completes successfully. However, while
       the receive is in progress, users who have write access to files or directories in the
       receiving path can add, remove, or modify files, in which case the resulting read-only
       subvolume will not be an exact copy of the sent subvolume.

       If the intention is to create an exact copy, the receiving path should be protected from
       access by users until the receive operation has completed and the subvolume is set to
       read-only.

       Additionally, receive does not currently do a very good job of validating that an
       incremental send stream actually makes sense, and it is thus possible for a specially
       crafted send stream to create a subvolume with reflinks to arbitrary files in the same
       filesystem. Because of this, users are advised to not use btrfs receive on send streams
       from untrusted sources, and to protect trusted streams when sending them across untrusted
       networks.

EXIT STATUS

       btrfs receive returns a zero exit status if it succeeds. Non zero is returned in case of
       failure.

AVAILABILITY

       btrfs is part of btrfs-progs. Please refer to the btrfs wiki http://btrfs.wiki.kernel.org
       for further details.

SEE ALSO

       mkfs.btrfs(8), btrfs-send(8)