.\"
.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
.\"
.\" Copyright (c) 2017 Kyle J. Kneitinger <kyle@kneit.in>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\"
.\"     @(#)be.1
.\"
.\" $FreeBSD$
.\"
.Dd August 17, 2018
.Dt BECTL 8
.Os
.Sh NAME
.Nm bectl
.Nd Utility to manage Boot Environments on ZFS
.Sh SYNOPSIS
.Nm
activate
.Op Fl t
.Ao Ar beName Ac
.Nm
create
.Op Fl r
.Op Fl e Ar nonActiveBe | Fl e Ar beName@snapshot
.Ao Ar beName Ac
.Nm
create
.Op Fl r
.Ao Ar beName@snapshot Ac
.Nm
destroy
.Op Fl F
.Ao Ar beName | beName@snapshot Ac
.Nm
export
.Ao Ar sourceBe Ac
.Nm
import
.Ao Ar targetBe Ac
.Nm
jail
.Op Fl b
.Oo Fl o Ar key Ns = Ns Ar value | Fl u Ar key Oc Ns ...
.Ao Ar jailID | jailName Ac
.Ao Ar bootenv Ac
.Op Ar utility Op Ar argument ...
.Nm
list
.Op Fl a
.Op Fl D
.Op Fl H
.Op Fl s
.Nm
mount
.Ao Ar beName Ac
.Op mountpoint
.Nm
rename
.Ao Ar origBeName Ac
.Ao Ar newBeName Ac
.Nm
{ ujail | unjail }
.Ao Ar jailID | jailName Ac
.Ao Ar bootenv Ac
.Nm
{ umount | unmount }
.Op Fl f
.Ao Ar beName Ac
.Sh DESCRIPTION
The
.Nm
command is used to setup and interact with ZFS boot environments, which are bootable clones of datasets.
.Pp
.Em Boot Environments
allows the system to be upgraded, while preserving the old system environment in a separate ZFS dataset.
.Sh COMMANDS
The following commands are supported by
.Nm :
.Bl -tag -width activate
.It Ic activate
.Op Fl t
.Ar <beName>
.Pp
Activate the given
.Ar beName
as the default boot filesystem.
If the
.Op Fl t
flag is given, this takes effect only for the next boot.
.It Ic create
.Op Fl r
.Op Fl e Ar nonActiveBe | Fl e Ar beName@snapshot
.Ao Ar beName Ac
.Pp
Creates a new boot environment named
.Ar beName .
If the -e param is specified, the new environment will be cloned from the given
.Ar nonActiveBe | Ar beName@snapshot .
If the
.Op Fl r
flag is given, a recursive boot environment will be made.
.It Ic create
.Op Fl r
.Ao Ar beName@snapshot Ac
.Pp
Creates a snapshot of the existing boot environment named
.Ar beName .
If the
.Op Fl r
flag is given, a recursive boot environment will be made.
.It Ic destroy
.Op Fl F
.Ao Ar beName | beName@snapshot Ac
.Pp
Destroys the given
.Ar beName
boot environment or
.Ar beName@snapshot
snapshot.
Specifying
.Fl F
will automatically unmount without confirmation.
.It Ic export
.Ao Ar sourceBe Ac
.Pp
Export
.Ar sourceBe
to
.Dv stdout .
.Dv stdout
must be piped or redirected to a file.
.It Ic import
.Ao Ar targetBe Ac
.Pp
Import
.Ar targetBe
from
.Dv stdin .
.It Ic jail
.Oo Fl o Ar key Ns = Ns Ar value | Fl u Ar key Oc Ns ...
.Ao Ar jailID | jailName Ac
.Ao Ar bootenv Ac
.Op Ar utility Op Ar argument ...
.Pp
Creates a jail of the given boot environment.
Multiple
.Fl o
and
.Fl u
arguments may be specified.
.Fl o
will set a jail parameter, and
.Fl u
will unset a jail parameter.
.Pp
By default, jails are created in interactive mode and
.Pa /bin/sh
is
executed within the jail.
If
.Ar utility
is specified, it will be executed instead of
.Pa /bin/sh .
.Pp
The
.Fl b
argument enables batch mode, thereby disabling interactive mode.
.Pp
The
.Va name ,
.Va host.hostname ,
and
.Va path
may not actually be unset.
Attempts to unset any of these will revert them to the default values specified
below, if they have been overwritten by
.Fl o .
.Pp
All
.Ar key ,
.Ar value
pairs are interpreted as jail parameters as described in
.Xr jail 8 .
The following default parameters are provided:
.Bl -tag -width -indent
.It Va allow.mount Ns = Ns Ar true
.It Va allow.mount.devfs Ns = Ns Ar true
.It Va enforce_statfs Ns = Ns Ar 1
.It Va name Ns = Ns Ar bootenv
.It Va host.hostname Ns = Ns Ar bootenv
.It Va path
Set to a path in /tmp generated by
.Xr libbe 3 .
.El
.Pp
All default parameters may be overwritten.
.It Ic list
.Op Fl a
.Op Fl D
.Op Fl H
.Op Fl s
.Pp
Displays all boot environments.
The Active field indicates whether the boot environment is active now (N); active on reboot (R); or both (NR).
.Pp
If
.Fl a
is used, display all datasets.
If
.Fl D
is used, display the full space usage for each boot environment, assuming all other boot environments were destroyed.
The
.Fl H
option is used for scripting.
It does not print headers and separate fields by a single tab instead of arbitrary white space.
If
.Fl s
is used, display all snapshots as well.
.It Ic mount
.Ao Ar beName Ac
.Op mountpoint
.Pp
Temporarily mount the boot environment.
Mount at the specified
.Ar mountpoint
if provided.
.It Ic rename Ao Ar origBeName Ac Ao Ar newBeName Ac
.Pp
Renames the given nonactive
.Ar origBeName
to the given
.Ar newBeName
.It Ic unjail Ao Ar jailID | jailName | beName Ac
.Pp
Destroys the jail created from the given boot environment.
.It Ic unmount
.Op Fl f
.Ao Ar beName Ac
.Pp
Unmount the given boot environment, if it is mounted.
Specifying
.Fl f
will force the unmount if busy.
.El
.Sh EXAMPLES
.Bl -bullet
.It
To fill in with jail upgrade example when behavior is firm.
.El
.Sh SEE ALSO
.Xr jail 8 ,
.Xr zfs 8 ,
.Xr zpool 8
.Sh HISTORY
.Nm
is based on
.Xr beadm 1
and was implemented as a project for the 2017 Summer of Code, along with
.Xr libbe 3 .
.Sh AUTHORS
.Bl -bullet
.It
.An Kyle Kneitinger (kneitinger) Aq Mt kyle@kneit.in
.Pp
Creator of
.Nm .
.It
.An Slawomir Wojciech Wojtczak (vermaden) Aq Mt vermaden@interia.pl
.Pp
Creator and maintainer of
.Xr beadm 1 .
.It
.An Bryan Drewery (bdrewery) Aq Mt bryan@shatow.net
.Pp
Wrote the original
.Xr beadm 1
manual page that this one is derived from.
.El