* sudo qemu-update-binfmt.sh <target>
Call update-binfmts to install /bin/qemu-<target> as the binfmt interpreter.
* sudo qemu-create-lxc.sh <target>
This script mixes linux container, binfmt and qemu to create hybrid linux
container : <target> container on an host kernel.
It will create "light" emulated virtual machine with several steps :
- create a linux-user qemu-<target>
- define it as the binfmt interpreter (using qemu-update-binfmt.sh).
- install a base debian system under /containers/<target> using debootstrap.
and set a minimal configuration.
- define a linux container
Then you can start the container using : sudo lxc-start -n virt<target>
TARGETS STATUS:
alpha: cannot run debootstrap --second stage*, but chroot is usable
m68k: need patches from qemu-m68k, after that, all is working fine.
mips: container can be started, but console login hangs.
ppc: works fine*
sparc: cannot run debootstrap --second stage (cannot fork)
raspberrypi: (=armhf+raspbian) works*
* needs patches I sent to the mailing-list previously
Signed-off-by: Laurent Vivier <laur...@vivier.eu>
---
scripts/qemu-create-lxc.sh | 280 ++++++++++++++++++++++++++++++++++++++++++++
scripts/qemu-update-binfmt | 60 ++++++++++
2 files changed, 340 insertions(+)
create mode 100755 scripts/qemu-create-lxc.sh
create mode 100755 scripts/qemu-update-binfmt
diff --git a/scripts/qemu-create-lxc.sh b/scripts/qemu-create-lxc.sh
new file mode 100755
index 0000000..c6023de
--- /dev/null
+++ b/scripts/qemu-create-lxc.sh
@@ -0,0 +1,280 @@
+QEMU_PATH=$(dirname $(dirname $(readlink -f $0)))
+
+TARGET_LIST="i386 m68k alpha sparc mips ppc raspberrypi"
+
+set_i386() {
+ : nothing specific
+}
+
+set_m68k() {
+ DEBIAN_REPO=http://archive.debian.org/debian
+ DEBIAN_DIST=etch-m68k
+ DEBIAN_SIGN=55BE302B
+
+ CONFIGURE_PARAMS=--m68k-default-cpu=m68040
+}
+
+set_alpha() {
+ DEBIAN_REPO=http://archive.debian.org/debian
+ DEBIAN_DIST=lenny
+}
+
+set_sparc() {
+ QEMU_TARGET=sparc32plus
+}
+
+set_mips() {
+ : nothing specific
+}
+
+set_ppc() {
+ DEBIAN_TARGET=powerpc
+}
+
+set_raspberrypi() {
+ DEBIAN_REPO=http://archive.raspbian.org/raspbian
+ DEBIAN_DIST=wheezy
+ DEBIAN_SIGN=""
+ DEBIAN_TARGET=armhf
+ QEMU_TARGET=arm
+}
+
+check_target() {
+ found=0
+ for available in $TARGET_LIST
+ do
+ if [ "$available" = "$TARGET" ]
+ then
+ found=1
+ break;
+ fi
+ done
+ if [ $found -eq 0 ]
+ then
+ echo "ERROR: unknown target $TARGET" 1>&2
+ exit 1
+ fi
+
+ # generic values
+
+ CONTAINER_NAME=virt${TARGET}
+ CONTAINER_PATH=/containers/${TARGET}
+ LXC_CONF=$HOME/lxc-${TARGET}.conf
+
+ DEBIAN_REPO=http://ftp.debian.org/debian
+ DEBIAN_DIST=stable
+ DEBIAN_SIGN=""
+ DEBIAN_TARGET=$TARGET
+
+ QEMU_TARGET=$TARGET
+
+ CHECK_BIN=check_default
+
+ # target specific values
+
+ set_$TARGET
+
+
QEMU_BIN=${QEMU_PATH}/build-${QEMU_TARGET}/${QEMU_TARGET}-linux-user/qemu-${QEMU_TARGET}
+}
+
+check_m68k() {
+ if ${QEMU_BIN} -cpu help | grep -q ">m68040"
+ then
+ echo "Found an existing qemu-m68k, use it !" 1>&2
+ return 0
+ fi
+ echo "Found an existing qemu-m68k, but with no m68040 emulation" 1>&2
+ echo "Please, remove it" 1>&2
+ echo "m68040 emulation is available from " 1>&2
+ echo "git clone git://gitorious.org/qemu-m68k/qemu-m68k.git"
+ exit 1
+}
+
+check_default() {
+ test -e ${QEMU_BIN}
+}
+
+installed_dpkg() {
+ dpkg --status "$1" > /dev/null 2>&1
+}
+
+check_env() {
+ if [ ! -e /etc/debian_version ]
+ then
+ echo "ERROR: this script works only on Debian based distro" 1>&2
+ exit 1
+ fi
+ for pkg in zlib1g gcc make debootstrap lxc
+ do
+ if ! installed_dpkg $pkg
+ then
+ echo "ERROR: $pkg is needed" 1>&2
+ exit 1
+ fi
+ done
+}
+
+create_qemu() {
+ if [ -e "${QEMU_BIN}" ]
+ then
+ if ${CHECK_BIN}
+ then
+ return 0
+ fi
+ fi
+ echo "cd ${QEMU_PATH} && \
+ mkdir build-${QEMU_TARGET} && \
+ cd build-${QEMU_TARGET} && \
+ ../configure --static ${CONFIGURE_PARAMS} \
+ --target-list=${QEMU_TARGET}-linux-user && \
+ make" | sudo -i -u ${SUDO_USER}
+ if ! ${CHECK_BIN}
+ then
+ echo "ERROR: generated qemu binary is invalid !" 1>&2
+ exit 1
+ fi
+}
+
+create_root() {
+ # sanity check
+
+ if [ $(readlink -f ${CONTAINER_PATH}/) = "/" ]
+ then
+ echo "ERROR: invalid path ${CONTAINER_PATH}" 1>&2
+ exit 1
+ fi
+
+ # check directory
+
+ if [ -e "${CONTAINER_PATH}" ]
+ then
+ echo "${CONTAINER_PATH} already exists" 1>&2
+ echo "Please, remove it" 1>&2
+ exit 1
+ fi
+
+ # Debian bootstrap
+
+ mkdir -p "${CONTAINER_PATH}"
+ debootstrap --foreign \
+ --arch=${DEBIAN_TARGET} \
+ ${DEBIAN_DIST} ${CONTAINER_PATH} \
+ ${DEBIAN_REPO} && \
+
+ # adding qemu binary
+
+ cp ${QEMU_BIN} ${CONTAINER_PATH}/bin && \
+ ${QEMU_PATH}/scripts/qemu-update-binfmt ${QEMU_TARGET}
+
+ # debian bootstrap second stage
+
+ chroot ${CONTAINER_PATH} debootstrap/debootstrap --second-stage
+
+ # configuration
+
+ cat >> ${CONTAINER_PATH}/etc/fstab <<!EOF
+# <file system> <mount point> <type> <options> <dump> <pass>
+proc /proc proc nodev,noexec,nosuid 0 1
+devpts /dev/pts devpts nodev,noexec,nosuid 0 1
+!EOF
+
+ echo "$CONTAINER_NAME" > ${CONTAINER_PATH}/etc/hostname
+ echo "c:2345:respawn:/sbin/getty 38400 console" >>
${CONTAINER_PATH}/etc/inittab
+
+ cat >> ${CONTAINER_PATH}/etc/network/interfaces <<!EOF
+auto eth0
+iface eth0 inet dhcp
+!EOF
+
+ cat >> ${CONTAINER_PATH}/etc/apt/sources.list <<!EOF
+deb ${DEBIAN_REPO} ${DEBIAN_DIST} main contrib non-free
+deb-src ${DEBIAN_REPO} ${DEBIAN_DIST} main contrib non-free
+!EOF
+
+ rm -f ${CONTAINER_PATH}/dev/ptmx
+
+ if [ "$DEBIAN_SIGN" != "" ]
+ then
+ HOME=/root chroot ${CONTAINER_PATH} gpg --keyserver
pgpkeys.mit.edu --recv-key ${DEBIAN_SIGN}
+ HOME=/root chroot ${CONTAINER_PATH} gpg -a --export
${DEBIAN_SIGN} | chroot ${CONTAINER_PATH} apt-key add -
+ fi
+ chroot ${CONTAINER_PATH} apt-get update
+ chroot ${CONTAINER_PATH} dpkg-reconfigure tzdata
+ chroot ${CONTAINER_PATH} apt-get install locales
+ chroot ${CONTAINER_PATH} dpkg-reconfigure locales
+ chroot ${CONTAINER_PATH} passwd
+}
+
+create_lxc() {
+ cat > ${LXC_CONF} <<!EOF
+lxc.utsname = ${CONTAINER_NAME}
+
+lxc.network.type = veth
+lxc.network.flags = up
+lxc.network.link = lxcbr0
+lxc.network.name = eth0
+
+lxc.pts=1023
+lxc.tty=12
+
+lxc.rootfs = ${CONTAINER_PATH}
+
+lxc.cgroup.devices.deny = a
+lxc.cgroup.devices.allow = c 136:* rwm # pts
+lxc.cgroup.devices.allow = c 254:0 rwm # rtc
+lxc.cgroup.devices.allow = c 5:* rwm
+lxc.cgroup.devices.allow = c 4:* rwm # ttyXX
+lxc.cgroup.devices.allow = c 1:* rwm
+lxc.cgroup.devices.allow = b 7:* rwm # loop
+lxc.cgroup.devices.allow = b 1:* rwm # ram
+
+!EOF
+ lxc-create -n ${CONTAINER_NAME} -f ${LXC_CONF}
+}
+
+TARGET="$1"
+
+if [ "$TARGET" = "" ]
+then
+ echo "ERROR: you must provide a target." 1>&2
+ echo " Available targets are:" 1>&2
+ echo " $TARGET_LIST"
+ exit 1
+fi
+
+
+check_env
+check_target
+
+echo "DEBIAN_TARGET : ${DEBIAN_TARGET}"
+echo "QEMU_TARGET : ${QEMU_TARGET}"
+echo "CONTAINER_NAME: ${CONTAINER_NAME}"
+echo "CONTAINER_PATH: ${CONTAINER_PATH}"
+echo "QEMU_PATH : ${QEMU_PATH}"
+echo "LXC_CONF : ${LXC_CONF}"
+echo "DEBIAN_REPO : ${DEBIAN_REPO}"
+echo "DEBIAN_DIST : ${DEBIAN_DIST}"
+
+if lxc-list | grep -q ${CONTAINER_NAME}
+then
+ echo "${CONTAINER_NAME} already exists !" 1>&2
+ echo "you can remove it with :" 1>&2
+ echo " sudo lxc-destroy -n ${CONTAINER_NAME}" 1>&2
+ echo "[WARNING: this will remove the directory too]" 1>&2
+ exit 2
+fi
+
+if [ "$USER" != "root" ]
+then
+ echo "You need to be root to run this command" 2>&1
+ exit 3
+fi
+
+create_qemu
+create_root
+create_lxc
+
+chroot ${CONTAINER_PATH} uname -a
+
+echo "you can now start your container using:"
+echo " sudo lxc-start -n ${CONTAINER_NAME}"
diff --git a/scripts/qemu-update-binfmt b/scripts/qemu-update-binfmt
new file mode 100755
index 0000000..ebdd971
--- /dev/null
+++ b/scripts/qemu-update-binfmt
@@ -0,0 +1,60 @@
+#!/bin/bash
+
+name="$1"
+
+# probe cpu type
+cpu=`uname -m`
+case "$cpu" in
+ i386|i486|i586|i686|i86pc|BePC|x86_64)
+ cpu="i386"
+ ;;
+ mips*)
+ cpu="mips"
+ ;;
+ "Power Macintosh"|ppc64)
+ cpu="ppc"
+ ;;
+ armv[4-9]*)
+ cpu="arm"
+ ;;
+esac
+
+if [ "$name" = "$cpu" ]
+then
+ exit 0
+fi
+
+case $name
+in
+ m68k)
+
magic="\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04"
+
mask="\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff"
+ ;;
+ alpha)
+
magic="\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90"
+
mask="\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff"
+ ;;
+ sparc32plus)
+
magic="\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12"
+
mask="\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff"
+ ;;
+ mips)
+
magic="\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08"
+
mask="\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff"
+ ;;
+ ppc)
+
magic="\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14"
+
mask="\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff"
+ ;;
+ arm)
+
magic="\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00"
+
mask="\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff"
+ ;;
+ *)
+ echo "ERROR: unknown target $name" 1<&2
+ exit 1
+ ;;
+esac
+
+update-binfmts --install $name /bin/qemu-${name} \
+ --magic $magic --mask $mask
--
1.7.10.4
