initial import of 'polystrap' debian tool

From http://anonscm.debian.org/gitweb/?p=emdebian/polystrap.git;a=summary

This imports 83ba112abb8f173254c60611b5a24ca0a72ca58f, from
from Tue, 9 Oct 2012 15:36:02 -0400 (21:36 +0200)

1 files changed, 181 insertions, 0 deletions

diff --git a/polystrap/polystrap.sh b/polystrap/polystrap.sh
new file mode 100755
index 000000000..2f1f09163
--- /dev/null
+++ b/polystrap/polystrap.sh
@@ -0,0 +1,181 @@
+#!/bin/sh
+#
+# polystrap - create a foreign architecture rootfs using multistrap, fakeroot,
+#             fakechroot and qemu usermode emulation
+#
+# Copyright (C) 2011 by Johannes 'josch' Schauer <j.schauer@email.de>
+#
+# 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.
+
+usage() {
+	echo "Usage: $0: [-f] [-v] [-n] [-s suite] [-a arch] [-d directory] [-m mirror] [-p packages] platform\n" >&2
+}
+
+export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true LC_ALL=C LANGUAGE=C LANG=C
+export PATH=$PATH:/usr/sbin:/sbin
+
+if [ "$FAKEROOTKEY" = "" ]; then
+	echo "I: re-executing script inside fakeroot"
+	fakeroot "$0" "$@";
+	exit
+fi
+
+FORCE=""
+MSTRAP_SIM=
+EXIT_ON_ERROR=true
+while getopts efvs:a:d:m:p:n opt; do
+	case $opt in
+	s) _SUITE="$OPTARG";;
+	a) _ARCH="$OPTARG";;
+	d) _ROOTDIR="$OPTARG";;
+	m) _MIRROR="$OPTARG";;
+	p) _PACKAGES="$OPTARG";;
+	n) MSTRAP_SIM="--simulate";;
+	e) EXIT_ON_ERROR=false;;
+	v) set -x;;
+	f) FORCE=true;;
+	?) usage; exit 1;;
+	esac
+done
+shift $(($OPTIND - 1))
+
+[ "$#" -ne 1 ] && { echo "too many positional arguments" >&2; usage; exit 1; }
+
+[ "$EXIT_ON_ERROR" = true ] && set -e
+
+BOARD="$1"
+
+[ ! -r "$BOARD" ] && { echo "cannot find target directory: $BOARD" >&2; exit 1; }
+[ ! -r "$BOARD/multistrap.conf" ] && { echo "cannot read multistrap config: $BOARD/multistrap.conf" >&2; exit 1; }
+
+# source default options
+. "default/config"
+
+# overwrite default options by target options
+[ -r "$BOARD/config" ] && . "$BOARD/config"
+
+# overwrite target options by commandline options
+SUITE=${_SUITE:-$SUITE}
+ARCH=${_ARCH:-$ARCH}
+ROOTDIR=$(readlink -m ${_ROOTDIR:-$ROOTDIR})
+MIRROR=${_MIRROR:-$MIRROR}
+
+if [ "$_PACKAGES" = "" ] && [ -r "$BOARD/packages" ]; then
+	# if no packages were given by commandline, read from package files
+	for f in $BOARD/packages/*; do
+		while read line; do PACKAGES="$PACKAGES $line"; done < "$f"
+	done
+else
+	# otherwise set as given by commandline
+	PACKAGES="$_PACKAGES"
+fi
+
+export QEMU_LD_PREFIX="`readlink -m "$ROOTDIR"`"
+export FAKECHROOT_CMD_SUBST=/usr/bin/ldd=/usr/bin/ldd.fakechroot:/sbin/ldconfig=/bin/true
+
+echo "I: --------------------------"
+echo "I: suite:   $SUITE"
+echo "I: arch:    $ARCH"
+echo "I: rootdir: $ROOTDIR"
+echo "I: mirror:  $MIRROR"
+echo "I: pkgs:    $PACKAGES"
+echo "I: --------------------------"
+
+[ -e "$ROOTDIR.tar" ] && [ ! "$FORCE" = true ] && { echo "tarball $ROOTDIR.tar still exists" >&2; exit 1; }
+
+# if rootdir exists, either warn and abort or delete and continue
+if [ -e "$ROOTDIR" ]; then
+	if [ "$FORCE" = true ]; then
+		rm -rf $ROOTDIR
+	else
+		echo "root directory $ROOTDIR still exists" >&2
+		exit 1
+	fi
+fi
+
+# create multistrap.conf
+echo "I: create multistrap.conf"
+MULTISTRAPCONF=`tempfile -d . -p multistrap`
+echo -n > "$MULTISTRAPCONF"
+while read line; do
+	eval echo $line >> "$MULTISTRAPCONF"
+done < $BOARD/multistrap.conf
+
+# download and extract packages
+echo "I: run multistrap" >&2
+multistrap $MSTRAP_SIM -f "$MULTISTRAPCONF"
+[ -z "$MSTRAP_SIM" ] || exit 0
+
+rm -f "$MULTISTRAPCONF"
+
+# convert absolute symlinks for fakechroot
+for link in `find $ROOTDIR -type l`; do
+        target=`readlink $link`
+        if [ "${target%%/*}" = "" ]; then # target begins with slash
+		echo "I: convert symlink: ${link#$ROOTDIR} -> $target"
+		rm $link
+                ln -s ${ROOTDIR}$target $link
+        fi
+done
+
+# copy initial directory tree - dereference symlinks
+echo "I: copy initial directory root tree $BOARD/root/ to $ROOTDIR/"
+if [ -r "$BOARD/root" ]; then
+	cp --recursive --dereference $BOARD/root/* $ROOTDIR/
+fi
+
+# preseed debconf
+echo "I: preseed debconf"
+if [ -r "$BOARD/debconfseed.txt" ]; then
+	cp "$BOARD/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/vpnc.preinst" ] && continue
+	echo "I: run preinst script ${script##$ROOTDIR}"
+	DPKG_MAINTSCRIPT_NAME=preinst \
+	DPKG_MAINTSCRIPT_PACKAGE="`basename $script .preinst`" \
+	fakechroot chroot $ROOTDIR ${script##$ROOTDIR} install
+done
+
+# run dpkg --configure -a twice because of errors during the first run
+echo "I: configure packages"
+fakechroot chroot $ROOTDIR /usr/bin/dpkg --configure -a || fakechroot chroot $ROOTDIR /usr/bin/dpkg --configure -a
+
+# source hooks
+if [ -r "$BOARD/hooks" ]; then
+	for f in $BOARD/hooks/*; do
+		echo "I: run hook $f"
+		. $f
+	done
+fi
+
+#cleanup
+echo "I: cleanup"
+rm $ROOTDIR/usr/sbin/policy-rc.d
+
+# need to generate tar inside fakechroot so that absolute symlinks are correct
+# tar is clever enough to not try and put the archive inside itself
+TARBALL=$(basename $ROOTDIR).tar
+echo "I: create tarball $TARBALL"
+fakechroot chroot $ROOTDIR tar -cf $TARBALL -C / .
+mv $ROOTDIR/$TARBALL .