105 lines
3.3 KiB
Groff
105 lines
3.3 KiB
Groff
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.\" Copyright (c) 2018 iXsystems, Inc
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd April 3, 2018
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.Dt ETDUMP 8
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.Os
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.Sh NAME
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.Nm etdump
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.Nd Dump El Torito boot catalog information from ISO images
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.Sh SYNOPSIS
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.Nm
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.Op Fl f Ar format
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.Op Fl o Ar file
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.Ar
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.Sh DESCRIPTION
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This program reads El Torito boot catalog information from an ISO image and
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outputs it in various formats.
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It can be used to check the catalog in an image or to output catalog data in
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a format that can be used by other tools such as shell scripts.
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.Pp
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Supported options are:
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.Bl -tag -width flag
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.It Fl f Ar format Fl -format Ar format
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Select the output format.
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Supported output formats are:
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.Bl -tag -width shell -offset indent
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.It Sy text
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Human-readable text (default)
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.It Sy shell
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Each boot entry is emitted as a string suitable for passing to a sh-compatible
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eval command.
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The variables emitted are:
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.Bl -tag -width et_platform -offset indent
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.It et_platform
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The platform ID from the section header.
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Set to 'default' for the initial (default) entry.
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.It et_system
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The system ID from the boot entry.
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.It et_lba
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The starting LBA (2048-byte blocks) of the boot image.
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.It et_sectors
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The number of sectors (512-byte sectors) that comprise the boot image.
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.El
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.El
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.It Fl o Ar file Fl -output Ar file
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Write output to
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.Ar file .
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If '-' is specified then standard out is used.
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.El
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.Sh EXAMPLES
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To see what entries are in a given boot catalog run
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.Nm
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passing the filename of the image as an argument like so:
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.Bd -literal -offset indent
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% etdump bootonly.iso
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Image in bootonly.iso
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Default entry
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System i386
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Start LBA 420 (0x1a4), sector count 4 (0x4)
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Media type: no emulation
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Section header: efi, final
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Section entry
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System i386
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Start LBA 20 (0x14), sector count 1600 (0x640)
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Media type: no emulation
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.Ed
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.Pp
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To use the output in a shell script a for loop can be used to iterate over the
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entries returned using eval:
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.Bd -literal -offset indent
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for entry in `etdump --format shell bootonly.iso`; do
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eval $entry
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echo $et_platform $et_system $et_lba $et_sectors
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done
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.Ed
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Fx 12.0 .
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