This module helps you export a subset of an installed Unix system, such as for use in containers, or an initrd, or just packaging an application with all of its dependencies. You start by specifying a list of the specific files you want, and this module attempts to automatically find all of the dependencies. It provides ways to rewrite user and group ownership, and can attempt to rewrite paths of existing binaries and libraries as it exports them.
use Sys::Export -src => '/', -dst => [ CPIO => "initrd.cpio" ];
rewrite_path '/sbin' => '/bin';
rewrite_path '/usr/sbin' => '/bin';
rewrite_path '/usr/bin' => '/bin';
# Add files and their dependencies
add '/bin/busybox';
add qw( bin/sh bin/date bin/cat bin/mount );
# tell 'add' to ignore specific files
skip 'usr/share/zoneinfo/tzdata.zi';
# recurse and filter directories with 'find'
add find 'usr/share/zoneinfo', sub { ! /(leapseconds|\.tab|\.list)$/ };
# For Linux, generate minimal /etc/passwd /etc/group /etc/shadow according
# to UID/GID which were exported so far.
exporter->add_passwd;
finish;
You can install the latest release from CPAN:
cpanm Sys::Export
or if you have a release tarball,
cpanm Sys-Export-002.tar.gz
or manually build it with
tar -xf Sys-Export-003.tar.gz
cd Sys-Export-002
perl Makefile.PL
make
make test
make install
Download or checkout the source code, then:
dzil --authordeps | cpanm
dzil test
To build and install a trial version, use
V=0.003_01 dzil build
cpanm Sys-Export-002_01.tar.gz