freebsd-skq/lib/libbe/libbe.3

.\"
.\" Copyright (c) 2017 Kyle Kneitinger
.\" All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" 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
.\" 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_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 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