btrfs-receive(8) - phpMan

BTRFS-RECEIVE(8) Btrfs Manual BTRFS-RECEIVE(8)

NAME
btrfs-receive - receive subvolumes from send stream

SYNOPSIS
btrfs receive [options] <path>

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.