[PATCH] polystrap-binfmt for preparing the build host

---
 README           |    2 +
 polystrap-binfmt |  129 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 131 insertions(+), 0 deletions(-)
 create mode 100755 polystrap-binfmt

diff --git a/README b/README
index 65434d2..59e6542 100644
--- a/README
+++ b/README
@@ -53,6 +53,8 @@ then used instead of the contents of the PLATFORM/packages directory:
 
 	-p packages
 
+Use the program  polystrap-binfmt  to prepare your build host
+
 How the script works:
 
  *) re-execute itself in fakeroot
diff --git a/polystrap-binfmt b/polystrap-binfmt
new file mode 100755
index 0000000..0460756
--- /dev/null
+++ b/polystrap-binfmt
@@ -0,0 +1,129 @@
+#!/bin/sh
+#
+# polystrap-binfmt - helps preparing the build host for running polystrap
+#
+# Copyright (C) 2011 by Geert Stappers <[email protected]>
+#
+# Polystrap-binfmt is based upon the research of 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 -e
+# set -x
+
+if [ $( id --user ) -eq 0 ] ; then
+	:
+else
+	echo 1>&2 E: Run this script as root
+	exit 1
+fi
+
+usage() {
+	echo -e "Usage: $0: [-m mirror] architecture directory\n"
+}
+
+export DEBIAN_FRONTEND=noninteractive DEBCONF_NONINTERACTIVE_SEEN=true \
+	LC_ALL=C LANGUAGE=C LANG=C
+
+while getopts m: opt; do
+	case $opt in
+	m) _MIRROR="$OPTARG";;
+	?) usage; exit 1;;
+	esac
+done
+shift $(($OPTIND - 1))
+
+[ "$#" -ne 2 ] && { echo 1>&2 "E: Two arguments required"; usage; exit 1; }
+
+ARCH="$1"
+TMPDIR="$2"
+
+if [ -d "$TMPDIR" ] ; then
+	TMPDIR="${TMPDIR}/polystrap-binfmt-$$"
+	mkdir $TMPDIR
+else
+	echo 1>&2 "E: $TMPDIR not an existing directory"
+	exit 1
+fi
+[ ! -d "$TMPDIR" ] && { echo 2>&1 "E: Could not create $TMPDIR"; exit 1; }
+
+MIRROR="http://ftp.nl.debian.org/debian"
+# overwrite default Debian archive by commandline option
+MIRROR=${_MIRROR:-$MIRROR}
+
+MTCNFG=$TMPDIR/multistrap.conf
+cat << LastLine > $MTCNFG
+# this is a temporary configuration file for multistrap
+# it is created by $0
+# and should also have been deleted by $0
+#
+[General]
+arch=
+directory=
+cleanup=true
+unpack=true
+noauth=true
+aptsources=Debian
+bootstrap=BinfmtStuff
+allowrecommends=false
+addimportant=false
+omitrequired=true
+
+[BinfmtStuff]
+packages=libc6 libselinux1 libacl1 man-db libstdc++6
+source=$MIRROR
+suite=sid
+omitdebsrc=true
+# l l
+LastLine
+
+[ ! -r "$MTCNFG" ] && { echo 1>&2 "E: Creation of $MTCNFG failed"; exit 1; }
+
+# download and extract packages with binfmt stuff
+multistrap -a $ARCH -d $TMPDIR/binfmtroot -f $MTCNFG
+RETVAL=$?
+if [ $RETVAL -ne 0 ] ; then
+	echo 1>&2 E: multistrap returned a non zero value
+	echo I: no clean up of temporary files done, the multistrap command was
+	echo I:  multistrap -a $ARCH -d $TMPDIR/binfmtroot -f $MTCNFG
+	exit 1
+fi
+
+# deduce binfmt architecture from architecture
+if [ "$ARCH" = $( dpkg --print-architecture ) ]; then
+	BINFMT_ARCH=$ARCH
+	echo W: It is strange to $0 on a $ARCH host for a $BINFMT_ARCH target
+else
+        case $ARCH in
+                alpha|amd64|arm|armeb|i386|m68k|mips|mipsel\
+		|powerpc|ppc64|sh4|sh4eb|sparc|sparc64)
+                	BINFMT_ARCH=$ARCH ;;
+                armel) 	BINFMT_ARCH=arm ;;
+                lpia)  	BINFMT_ARCH=i386 ;; # not yet verified FIXME
+                *) echo "unknown architecture: $ARCH"; exit 1;;
+        esac
+fi
+
+rm -rf                   /etc/qemu-binfmt/$BINFMT_ARCH
+cp -r $TMPDIR/binfmtroot /etc/qemu-binfmt/$BINFMT_ARCH
+
+# clean up
+rm -rf $TMPDIR
+
+# l l
-- 
1.7.5.4