Script to add firmware files to a debian ISO

add-firmware-to-debian.sh

#!/bin/bash

#
# add-firmware-to: Add non-free firmware to Debian install media
#
# Copyright (C) 2008-2009 dann frazier <dannf@debian.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Changelog:
# 2011.02.08 - Add support for initrd.img files (same as initrd.gz)
#              (Andrew McGlashan)
# 2009.02.17 - Add support for isolinux-based CD images,
#              which should work for i386/amd64 - happy
#              to add other archs upon request
# 2008.??.?? - Initial creation, just works on initrds
#

set -e

is_iso() {
   file -ik "$1" | grep -q iso9660
}

is_initrd() {
    file -ik "$1" | grep -q gzip
}

fetch_firmware() {
    local target="$1"
    local debianversion="$2"
    wget "http://cdimage.debian.org/cdimage/unofficial/non-free/firmware/$debianversion/current/firmware.tar.gz" -O "$target"
}

am_root() {
    [ "$(id -u)" -eq 0 ]
}

initrd_append_fw() {
    local initrd="$1"
    local fwfile="$2"
    local outfile="$3"

    local initrdtmp="$(mktemp -d)"
    gunzip < "$initrd" > "$initrdtmp/initrd"

    cd "$initrdtmp"

    tar xfz "$fwfile"
    mkdir x
    for file in *deb; do
        dpkg-deb -x "$file" x
    done

    (cd x && find . | cpio -H newc -o) >> initrd
    cd -
    gzip -9 < "$initrdtmp/initrd" > "$outfile"

    rm -rf "$initrdtmp"
}

if [ ! -x /usr/bin/dpkg-deb ]; then
    echo "Command dpkg-deb not found" >&2
    exit 1
fi

if [ ! -x /usr/bin/wget ]; then
    echo "Command wget not found" >&2
    exit 1
fi

if [ ! -x /usr/bin/cpio ]; then
    echo "Command cpio not found" >&2
    exit 1
fi

if [ $# != 3 ]; then
    echo "Usage: add-firmware-to.sh <infile> <outfile> <debianversion>" >&2
    exit 1
fi

file="$1"
if [ ! -f "$file" ]; then
    echo "$file not found" >&2
    exit 2
fi

if is_iso "$1" && [ ! -x /usr/bin/mkisofs ]; then
    echo "Command mkisofs not found" >&2
    exit 1
fi

outfile="$2"
if [ -e "$outfile" ]; then
    echo "$outfile already exists" >&2
    exit 2
fi

debianversion="$3"

fwfile="$(mktemp)"
if ! fetch_firmware "$fwfile" "$debianversion"; then
    echo "ERROR: Could not download firmware" >&2
    exit 1
fi

if is_iso "$file"; then
    isotmp="$(mktemp -d)"
    tmpmnt="$isotmp/tmpmnt"
    buildtree="$isotmp/buildtree"

    mkdir "$tmpmnt"
    if am_root; then
        MOUNT="mount"
        UMOUNT="umount"
    elif [ -x /usr/bin/sudo ]; then
        echo "Attempting to use sudo to gain mount capabilities..."
        MOUNT="sudo mount"
        UMOUNT="sudo umount"
    else
        echo "WARNING: Couldn't find sudo and not running as root." >&2
        echo "WARNING: Trying to loopback mount the iso anyway..." >&2
        MOUNT="mount"
        UMOUNT="umount"
    fi
    $MOUNT "$file" "$tmpmnt" -o loop
    cp -a "$tmpmnt" "$buildtree"
    $UMOUNT "$tmpmnt"
    rmdir "$tmpmnt"

    chmod -R u+w "$buildtree"
    for i in $(find "$buildtree" -name "initrd.gz" -o -name "initrd.img"); do
        initrd_append_fw "$i" "$fwfile" "$i"
    done
    isolinuxpath="$(cd $buildtree && find . -name isolinux.bin | head -1 | cut -b 3-)"
    mkisofs -r -J -b "$isolinuxpath" -c boot.cat \
            -no-emul-boot -boot-load-size 4 -boot-info-table \
            -o "$outfile" "$buildtree"
    rm -rf "$isotmp"
fi

if is_initrd "$file"; then
    initrd_append_fw "$file" "$fwfile" "$outfile"
fi

echo "Output in $outfile"

rm "$fwfile"