.\"
.\" Copyright (c) 2017 Kyle Kneitinger
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" This manual page is based on the mp(3X) manual page from Sun Release
.\" 4.1, dated 7 September 1989.  It's an old, crufty, and relatively ugly
.\" manual page, but it does document what appears to be the "traditional"
.\" libmp interface.
.\"
.\" $FreeBSD$
.\"
.Dd July 25, 2018
.Dt LIBBE 3
.Os
.Sh NAME
.Nm libbe
.Nd library for creating, destroying and modifying ZFS boot environments.
.Sh SYNOPSIS
.In be.h
.Pp
Function prototypes are given in the main body of the text.
.Pp
Applications using this interface must be linked with
.Fl l Ns Ar be
.Sh DESCRIPTION
.Pp
.Nm
interfaces with libzfs to provide a set of functions for various operations
regarding ZFS boot environments including "deep" boot environments in which
a boot environments has child datasets.
.Pp
A context structure is passed to each function, allowing for a small amount
of state to be retained, such as errors from previous operations.
.\" TODO: describe break on err functionality
.Pp
.Ft "libbe_handle_t *" Ns
.Fn libbe_init "void" ;
.Pp
.Ft void
.Fn libbe_close "libbe_handle_t *" ;
.Pp
.Ft "const char *" Ns
.Fn be_active_name "libbe_handle_t *" ;
.Pp
.Ft "const char *" Ns
.Fn be_active_path "libbe_handle_t *" ;
.Pp
.Ft "const char *" Ns
.Fn be_root_path "libbe_handle_t *" ;
.Pp
.Ft "nvlist_t *" Ns
.Fn  libbe_handle_t "libbe_handle_t " ;
.Pp
.Ft int
.Fn be_create "libbe_handle_t *, char *" ;
.Pp
.Ft int
.Fn be_create_from_existing "libbe_handle_t *, const char *, const char *" ;
.Pp
.Ft int
.Fn be_rename "libbe_handle_t *, char *, char *" ;
.Pp
.\" TODO: Write up of destroy options
.\" typedef enum {
.\"	BE_DESTROY_FORCE = 1 << 0,
.\" } be_destroy_opt_t;
.Ft int
.Fn be_destroy "libbe_handle_t *, char *, int" ;
.Pp
.Ft void
.Fn be_nicenum "uint64_t, char *, size_t" ;
.Pp
.\" TODO: Write up of mount options
.\" typedef enum {
.\"	BE_MNT_FORCE		= 1 << 0,
.\"	BE_MNT_DEEP		= 1 << 1,
.\" } be_mount_opt_t;
.Ft int
.Fn be_mount "libbe_handle_t *, char *, char *, int" ;
.Pp
.Ft int
.Fn be_mounted_at "libbe_handle_t *, const char *, nvlist_t" ;
.Pp
.Ft int
.Fn be_unmount "libbe_handle_t *, char *, int" ;
.Pp
.Ft int
.Fn libbe_errno "libbe_handle_t *" ;
.Pp
.Ft "const char *" Ns
.Fn libbe_error_description "libbe_handle_t *" ;
.Pp
.Ft void
.Fn libbe_print_on_error "libbe_handle_t *, bool" ;
.Pp
.Ft int
.Fn be_root_concat "libbe_handle_t *, const char *, char *" ;
.Pp
.Ft int
.Fn be_validate_name "libbe_handle_t *, const char *" ;
.Pp
.Ft int
.Fn be_validate_snap "libbe_handle_t *, const char *" ;
.Pp
.Ft bool
.Fn be_exists "libbe_handle_t *, char *" ;
.Pp
.Ft int
.Fn be_export "libbe_handle_t *, char *, int fd" ;
.Pp
.Ft int
.Fn be_import "libbe_handle_t *, char *, int fd" ;
.Pp
.Ft int
.Fn be_add_child "libbe_handle_t *, char *, bool" ;
.Pp
.Ft int
.Fn be_prop_list_alloc "nvlist_t **" ;
.Pp
.Ft int
.Fn be_get_bootenv_props "libbe_handle_t *, nvlist_t *" ;
.Pp
.Ft int
.Fn be_get_dataset_props "libbe_handle_t *, const char *, nvlist_t *" ;
.Pp
.Ft int
.Fn be_get_dataset_snapshots "libbe_handle_t *, const char *, nvlist_t *" ;
.Pp
.Ft void
.Fn be_prop_list_free "nvlist_t *" ;
.\" .Ft void
.\" .Fn mp_mfree "MINT *mp" ;
.\" .Bd -ragged -offset indent
.\" .Fn mp_itom
.\" returns an
.\" .Vt MINT
.\" with the value of
.\" .Fa n .
.\" .Fn mp_xtom
.\" returns an
.\" .Vt MINT
.\" with the value of
.\" .Fa s ,
.\" which is treated to be in hexadecimal.
.\" The return values from
.\" .Fn mp_itom
.\" and
.\" .Fn mp_xtom
.\" must be released with
.\" .Fn mp_mfree
.\" when they are no longer needed.
.\" .Fn mp_mtox
.\" returns a null-terminated hexadecimal string having the value of
.\" .Fa mp ;
.\" its return value must be released with
.\" .Fn free
.\" .Pq Xr free 3
.\" when it is no longer needed.
.\" .Ed
.\" .Pp
.Sh DIAGNOSTICS
Upon error, one of the following values will be returned.
.\" TODO: make each entry on its own line.
.Bd -ragged -offset indent
BE_ERR_SUCCESS,
BE_ERR_INVALIDNAME,
BE_ERR_EXISTS,
BE_ERR_NOENT,
BE_ERR_PERMS,
BE_ERR_DESTROYACT,
BE_ERR_DESTROYMNT,
BE_ERR_PATHLEN,
BE_ERR_INVORIGIN,
BE_ERR_NOORIGIN,
BE_ERR_MOUNTED,
BE_ERR_NOMOUNT,
BE_ERR_ZFSOPEN,
BE_ERR_ZFSCLONE,
BE_ERR_UNKNOWN
.Ed
.Sh SEE ALSO
.Xr be 1 ,
.Sh HISTORY
.Nm
and it's corresponding command,
.Xr be 3 ,
were written as a 2017 Google Summer of Code project with Allan Jude serving
as a mentor.
.\" TODO: update when implementation complete.
.\" .Sh BUGS