#!/bin/sh # # polystrap - create a foreign architecture rootfs using multistrap, fakeroot, # fakechroot and qemu usermode emulation # # Copyright (C) 2011 by Johannes 'josch' Schauer # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING # FROM,OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS # IN THE SOFTWARE. set -ex usage() { echo "Usage: $0: [-s suite] [-a arch] [-d directory] [-m mirror] [-p packages] platform\n" >&2 } export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true LC_ALL=C LANGUAGE=C LANG=C export PATH=$PATH:/usr/sbin:/sbin if [ "$FAKEROOTKEY" = "" ]; then echo "re-executing script inside fakeroot" >&2 fakeroot "$0" "$@"; exit fi while getopts s:a:d:m:p: opt; do case $opt in s) _SUITE="$OPTARG";; a) _ARCH="$OPTARG";; d) _ROOTDIR="$OPTARG";; m) _MIRROR="$OPTARG";; p) _PACKAGES="$OPTARG";; ?) usage; exit 1;; esac done shift $(($OPTIND - 1)) [ "$#" -ne 1 ] && { echo "too many positional arguments" >&2; usage; exit 1; } PLATFORM="$1" [ ! -r "$PLATFORM" ] && { echo "cannot find target directory: $PLATFORM" >&2; exit 1; } [ ! -r "$PLATFORM/multistrap.conf" ] && { echo "cannot read multistrap config: $PLATFORM/multistrap.conf" >&2; exit 1; } # source default options . "default/config" # overwrite default options by target options [ -r "$PLATFORM/config" ] && . "$PLATFORM/config" # overwrite target options by commandline options SUITE=${_SUITE:-$SUITE} ARCH=${_ARCH:-$ARCH} ROOTDIR=${_ROOTDIR:-$ROOTDIR} MIRROR=${_MIRROR:-$MIRROR} if [ "$_PACKAGES" = "" ] && [ -r "$PLATFORM/packages" ]; then # if no packages were given by commandline, read from package files for f in $PLATFORM/packages/*; do while read line; do PACKAGES="$PACKAGES $line"; done < "$f" done else # otherwise set as given by commandline PACKAGES="$_PACKAGES" fi # binutils must always be installed for objdump for fake ldd PACKAGES="$PACKAGES binutils" echo "--------------------------" >&2 echo "suite: $SUITE" >&2 echo "arch: $ARCH" >&2 echo "rootdir: $ROOTDIR" >&2 echo "mirror: $MIRROR" >&2 echo "pkgs: $PACKAGES" >&2 echo "--------------------------" >&2 [ -e "$ROOTDIR.tar" ] && { echo "tarball still exists" >&2; exit 1; } [ -e "$ROOTDIR" ] && { echo "root directory still exists" >&2; exit 1; } # create multistrap.conf MULTISTRAPCONF=`tempfile -d . -p multistrap` echo -n > "$MULTISTRAPCONF" while read line; do eval echo $line >> "$MULTISTRAPCONF" done < $PLATFORM/multistrap.conf # download and extract packages multistrap -f "$MULTISTRAPCONF" rm -f "$MULTISTRAPCONF" # backup ldconfig and ldd mv $ROOTDIR/sbin/ldconfig $ROOTDIR/sbin/ldconfig.REAL mv $ROOTDIR/usr/bin/ldd $ROOTDIR/usr/bin/ldd.REAL # copy initial directory tree - dereference symlinks if [ -r "$PLATFORM/root" ]; then cp --recursive --dereference $PLATFORM/root/* $ROOTDIR/ fi # copy qemu usermode binary if [ $ARCH != "`dpkg --print-architecture`" ]; then case $ARCH in alpha|arm|armeb|i386|m68k|mips|mipsel|ppc64|sh4|sh4eb|sparc|sparc64) cp `which qemu-$ARCH-static` $ROOTDIR/usr/bin;; amd64) cp `which qemu-x86_64-static` $ROOTDIR/usr/bin;; armel) cp `which qemu-arm-static` $ROOTDIR/usr/bin;; lpia) cp `which qemu-i386-static` $ROOTDIR/usr/bin;; powerpc) cp `which qemu-ppc-static` $ROOTDIR/usr/bin;; *) echo "unknown architecture: $ARCH" >&2; exit 1;; esac fi # preseed debconf if [ -r "$PLATFORM/debconfseed.txt" ]; then cp "$PLATFORM/debconfseed.txt" $ROOTDIR/tmp/ fakechroot chroot $ROOTDIR debconf-set-selections /tmp/debconfseed.txt rm $ROOTDIR/tmp/debconfseed.txt fi # run preinst scripts for script in $ROOTDIR/var/lib/dpkg/info/*.preinst; do [ "$script" = "$ROOTDIR/var/lib/dpkg/info/bash.preinst" ] && continue fakechroot chroot $ROOTDIR ${script##$ROOTDIR} install done # run dpkg --configure -a twice because of errors during the first run fakechroot chroot $ROOTDIR /usr/bin/dpkg --configure -a || fakechroot chroot $ROOTDIR /usr/bin/dpkg --configure -a # source hooks if [ -r "$PLATFORM/hooks" ]; then for f in $PLATFORM/hooks/*; do . $f done fi #cleanup rm $ROOTDIR/sbin/ldconfig $ROOTDIR/usr/bin/ldd mv $ROOTDIR/sbin/ldconfig.REAL $ROOTDIR/sbin/ldconfig mv $ROOTDIR/usr/bin/ldd.REAL $ROOTDIR/usr/bin/ldd rm $ROOTDIR/usr/sbin/policy-rc.d # need to generate tar inside fakechroot so that absolute symlinks are correct # tar is clever enough to not try and put the archive inside itself fakechroot chroot $ROOTDIR tar -cf $ROOTDIR.tar -C / . mv $ROOTDIR/$ROOTDIR.tar .