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https://github.com/kdave/btrfs-progs
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17144afb40
Signed-off-by: Nicholas D Steeves <nsteeves@gmail.com> Signed-off-by: David Sterba <dsterba@suse.com>
106 lines
3.1 KiB
Plaintext
106 lines
3.1 KiB
Plaintext
btrfs-receive(8)
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================
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NAME
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----
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btrfs-receive - receive subvolumes from send stream
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SYNOPSIS
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--------
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*btrfs receive* [options] <path>
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or
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*btrfs receive* --dump [options]
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DESCRIPTION
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-----------
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Receive a stream of changes and replicate one or more subvolumes that were
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previously generated by *btrfs send*. The received subvolumes are stored to
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'path', unless '--dump' option is given.
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If '--dump' option is specified, *btrfs receive* will only do the validation of
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the stream, and print the stream metadata, one operation per line.
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*btrfs receive* will fail in the following cases:
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1. receiving subvolume already exists
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2. previously received subvolume has been changed after it was received
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3. default subvolume has changed or you didn't mount the filesystem at the toplevel subvolume
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A subvolume is made read-only after the receiving process finishes successfully (see BUGS below).
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`Options`
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-v::
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increase verbosity about performed actions, print details about each operation
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-f <FILE>::
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read the stream from <FILE> instead of stdin,
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-C|--chroot::
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confine the process to 'path' using `chroot`(1)
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-e::
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terminate after receiving an 'end cmd' marker in the stream.
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+
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Without this option the receiver side terminates only in case
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of an error on end of file.
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-E|--max-errors <NERR>::
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terminate as soon as NERR errors occur while stream processing commands from
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the stream
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Default value is 1. A value of 0 means no limit.
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-m <ROOTMOUNT>::
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the root mount point of the destination filesystem
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+
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By default the mountpoint is searched in '/proc/self/mounts'.
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If '/proc' is not accessible, eg. in a chroot environment, use this option to
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tell us where this filesystem is mounted.
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--dump::
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dump the stream metadata, one line per operation
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+
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Does not require the 'path' parameter. The filesystem remains unchanged.
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BUGS
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----
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*btrfs receive* sets the subvolume read-only after it completes
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successfully. However, while the receive is in progress, users who have
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write access to files or directories in the receiving 'path' can add,
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remove, or modify files, in which case the resulting read-only subvolume
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will not be an exact copy of the sent subvolume.
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If the intention is to create an exact copy, the receiving 'path'
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should be protected from access by users until the receive operation
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has completed and the subvolume is set to read-only.
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Additionally, receive does not currently do a very good job of validating
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that an incremental send streams actually makes sense, and it is thus
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possible for a specially crafted send stream to create a subvolume with
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reflinks to arbitrary files in the same filesystem. Because of this,
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users are advised to not use *btrfs receive* on send streams from
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untrusted sources, and to protect trusted streams when sending them
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across untrusted networks.
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EXIT STATUS
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-----------
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*btrfs receive* returns a zero exit status if it succeeds. Non zero is
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returned in case of failure.
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AVAILABILITY
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------------
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*btrfs* is part of btrfs-progs.
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Please refer to the btrfs wiki http://btrfs.wiki.kernel.org for
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further details.
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SEE ALSO
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--------
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`mkfs.btrfs`(8),
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`btrfs-send`(8)
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