.TH GENSQUASHFS "1" "June 2019" "generate squashfs images" "User Commands"
.SH NAME
gensquashfs \- generate squashfs images
.SH SYNOPSIS
.B gensquashfs
[\fI\,OPTIONS\/\fR] <squashfs-file>\/\fR
.SH DESCRIPTION
Generate a SquashFS image.
.SH OPTIONS
.TP
\fB\-\-pack\-file\fR, \fB\-F\fR <file>
Use a \fBgen_init_cpio\fR style description file. The file format is specified
below. If \fB\-\-pack\-dir\fR is used, input file paths are relative to the
pack directory, otherwise they are relative to the directory the pack file
is in.
.TP
\fB\-\-pack\-dir\fR, \fB\-D\fR <directory>
If \fB\-\-pack\-file\fR is used, this is the root path relative to which to
read files. If no pack file is specified, pack the contents of the given
directory into a SquashFS image. The directory becomes the root of the file
system.
.TP
\fB\-\-compressor\fR, \fB\-c\fR <name>
Select the compressor to use (defaults to 'xz').
Run \fBgensquashfs \-\-help\fR to get a list of all available compressors.
.TP
\fB\-\-comp\-extra\fR, \fB\-X\fR <options>
A comma seperated list of extra options for the selected compressor. Specify
\fBhelp\fR to get a list of available options.
.TP
\fB\-\-block\-size\fR, \fB\-b\fR <size>
Block size to use for Squashfs image.
Defaults to 131072.
.TP
\fB\-\-dev\-block\-size\fR, \fB\-B\fR <size>
Device block size to padd the image to.
Defaults to 4096.
.TP
\fB\-\-defaults\fR, \fB\-d\fR <options>
A comma seperated list of default values for
implicitly created directories.
The following values can be set:
.TS
tab(;) allbox;
l l
l l
l l
l l
l l
rd.
\fBOption\fR;\fBDefault\fR
uid=<value>;0
gid=<value>;0
mode=<value>;0755
mtime=<value>;0
.TE
.TP
.TP
\fB\-\-selinux\fR, \fB\-s\fR <file>
If built with SELinux support, use the given SELinux label file to add context
labels to the elements packed into the SquashFS image.
.TP
\fB\-\-force\fR, \fB\-f\fR
Overwrite the output file if it exists.
.TP
\fB\-\-quiet\fR, \fB\-q\fR
Do not print out progress reports.
.TP
\fB\-\-help\fR, \fB\-h\fR
Print help text and exit.
.TP
\fB\-\-version\fR, \fB\-V\fR
Print version information and exit.
.SH INPUT FILE FORMAT
The input file contains a simple, newline separated list that describe the
files to be included in the squashfs image:
.PP
.in +4n
.nf
# a comment
file <path> <mode> <uid> <gid> [<location>]
dir <path> <mode> <uid> <gid>
nod <path> <mode> <uid> <gid> <dev_type> <maj> <min>
slink <path> <mode> <uid> <gid> <target>
pipe <path> <mode> <uid> <gid>
sock <path> <mode> <uid> <gid>
.fi
.in

.TS
tab(;) allbox;
l l
l l
l l
l l
l l
l l
l l
l l
l l
rd.
<path>;Absolute path of the entry in the image.
<location>;T{
Optional location of the input file. Can be specified relative to either the
description file or the pack directory. If omitted, the image path is used
as a relative path.
T}
<target>;Symlink target.
<mode>;Mode/permissions of the entry.
<uid>;Numeric user id.
<gid>;Numeric group id.
<dev_type>;Device type (b=block, c=character).
<maj>;Major number of a device special file.
<min>;Minor number of a device special file.
.TE

.PP
Example:
.PP
.in +4n
.nf
# A simple squashfs image
dir /dev 0755 0 0
nod /dev/console 0600 0 0 c 5 1
dir /root 0700 0 0
dir /sbin 0755 0 0

# Add a file. Input is relative to pack dir or listing path
file /sbin/init 0755 0 0 ../init/sbin/init

# Read from ./bin/bash relative to pack dir or listing path
# /bin is created implicitly with default attributes.
file /bin/bash 0755 0 0
.fi
.in
.SH AUTHOR
Written by David Oberhollenzer.
.SH COPYRIGHT
Copyright \(co 2019 David Oberhollenzer
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.
.br
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.