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lxc-debian: allow to specify a binfmt interpreter

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If you specify an interpreter path with "-I" or "--interpreter-path",
the architecture of the debian container can differ from the one of
the host.

Before creating the container, binfmt must be configured on the host:
the script checks the name of the interpreter in /proc/sys/fs/binfmt_misc/
to know where to install it in the container.

To create a MIPS container on an x86_64 host:

$ cat /proc/sys/fs/binfmt_misc/qemu-mips
enabled
interpreter //qemu-mips
flags: OC
offset 0
magic 7f454c4601020100000000000000000000020008
mask ffffffffffffff00fffffffffffffffffffeffff

$ sudo lxc-create -n virtmips-stretch -t debian -- \
                 --arch=mips \
                 --interpreter-path=./mips-linux-user/qemu-mips \
                 --mirror=http://ftp.debian.org/debian \
                 --release=stretch

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2016-06-13 14:34:06 +02:00 committed by Christian Brauner
parent 56c80e0d4d
commit d50cebd697
1 changed files with 91 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

79
templates/lxc-debian.in
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@ -41,6 +41,29 @@ LXC_TEMPLATE_CONFIG="@LXCTEMPLATECONFIG@"
# Allows the lxc-cache directory to be set by environment variable
LXC_CACHE_PATH=${LXC_CACHE_PATH:-"$LOCALSTATEDIR/cache/lxc"}
find_interpreter()
{
given_interpreter=$(basename "$1")
if [ ! -d /proc/sys/fs/binfmt_misc/ ] ; then
return 1
fi
for file in /proc/sys/fs/binfmt_misc/* ; do
if [ "$file" = "/proc/sys/fs/binfmt_misc/register" -o \
"$file" = "/proc/sys/fs/binfmt_misc/status" ] ; then
continue
fi
interpreter_path=$(sed -n "/^interpreter/s/interpreter \([^[:space:]]*\)/\1/p" "$file")
interpreter=$(basename $interpreter_path)
if [ "$given_interpreter" = "$interpreter" ] ; then
echo "$interpreter_path"
return 0
fi
done
return 1
}
configure_debian()
{
rootfs=$1
@ -252,6 +275,8 @@ openssh-server
cache=$1
arch=$2
release=$3
interpreter="$4"
interpreter_path="$5"
trap cleanup EXIT SIGHUP SIGINT SIGTERM
@ -285,6 +310,7 @@ openssh-server
# download a mini debian into a cache
echo "Downloading debian minimal ..."
if [ "$interpreter" = "" ] ; then
debootstrap --verbose --variant=minbase --arch=$arch \
--include=$packages --keyring=${releasekeyring} \
"$release" "$cache/partial-$release-$arch" $MIRROR
@ -292,6 +318,26 @@ openssh-server
echo "Failed to download the rootfs, aborting."
return 1
fi
else
debootstrap --foreign --verbose --variant=minbase --arch=$arch \
--include=$packages --keyring=${releasekeyring} \
"$release" "$cache/partial-$release-$arch" $MIRROR
if [ $? -ne 0 ]; then
echo "Failed to download the rootfs, aborting."
return 1
fi
mkdir -p $(basename "$cache/partial-$release-$arch/$interpreter_path")
cp "$interpreter" "$cache/partial-$release-$arch/$interpreter_path"
if [ $? -ne 0 ]; then
echo "failed to copy $interpreter to $cache/partial-$release-$arch/$interpreter_path"
return 1
fi
chroot "$cache/partial-$release-$arch" debootstrap/debootstrap --second-stage
if [ $? -ne 0 ]; then
echo "failed to update the rootfs, aborting"
return 1
fi
fi
mv "$1/partial-$release-$arch" "$1/rootfs-$release-$arch"
echo "Download complete."
@ -323,6 +369,8 @@ install_debian()
release=$2
arch=$3
cache="$4/debian"
interpreter="$5"
interpreter_path="$6"
mkdir -p $LOCALSTATEDIR/lock/subsys/
(
flock -x 9
@ -333,7 +381,7 @@ install_debian()
echo "Checking cache download in $cache/rootfs-$release-$arch ... "
if [ ! -e "$cache/rootfs-$release-$arch" ]; then
download_debian $cache $arch $release
download_debian $cache $arch $release "$interpreter" "$interpreter_path"
if [ $? -ne 0 ]; then
echo "Failed to download 'debian base'"
return 1
@ -388,6 +436,7 @@ copy_configuration()
lxc.tty = $num_tty
lxc.utsname = $hostname
lxc.arch = $arch
lxc.pts=1023
EOF
if [ $? -ne 0 ]; then
@ -404,6 +453,7 @@ post_process()
local release="$1"; shift
local arch="$1"; shift
local hostarch="$1"; shift
local interpreter="$1"; shift
local packages="$*"
# Disable service startup
@ -414,7 +464,7 @@ EOF
chmod +x ${rootfs}/usr/sbin/policy-rc.d
# If the container isn't running a native architecture, setup multiarch
if [ "${arch}" != "${hostarch}" ]; then
if [ "$interpreter" = "" -a "${arch}" != "${hostarch}" ]; then
# Test if dpkg supports multiarch
if ! chroot $rootfs dpkg --print-foreign-architecture 2>&1; then
chroot $rootfs dpkg --add-architecture ${hostarch}
@ -423,7 +473,7 @@ EOF
# Write a new sources.list containing both native and multiarch entries
> ${rootfs}/etc/apt/sources.list
if [ "${arch}" = "${hostarch}" ]; then
if [ "$interpreter" != "" -a "${arch}" = "${hostarch}" ]; then
write_sourceslist ${rootfs} ${release} ${arch}
else
write_sourceslist ${rootfs} ${release}
@ -492,6 +542,7 @@ Template specific options can be passed to lxc-create after a '--' like this:
Usage: $1 -h|--help -p|--path=<path> [-c|--clean] [-a|--arch=<arch>] [-r|--release=<release>]
[--mirror=<mirror>] [--security-mirror=<security mirror>]
[--package=<package_name1,package_name2,...>]
[-I|--interpreter-path=<interpreter path>]
Options :
@ -510,6 +561,8 @@ Options :
List of additional packages to install. Comma separated, without space.
-c, --clean only clean up the cache and terminate
--enable-non-free include also Debian's contrib and non-free repositories.
-I|--interpreter-path=INTERPRETER-PATH
Path of the binfmt interpreter to copy to the rootfs
Environment variables:
@ -522,7 +575,7 @@ EOF
return 0
}
options=$(getopt -o hp:n:a:r:c -l arch:,clean,help,enable-non-free,mirror:,name:,packages:,path:,release:,rootfs:,security-mirror: -- "$@")
options=$(getopt -o hp:n:a:r:cI: -l arch:,clean,help,enable-non-free,mirror:,name:,packages:,path:,release:,rootfs:,security-mirror:,interpreter-path: -- "$@")
if [ $? -ne 0 ]; then
usage $(basename $0)
exit 1
@ -547,6 +600,8 @@ do
--) shift 1; break ;;
-a|--arch) arch=$2; shift 2;;
-I|--interpreter-path)
interpreter="$2"; shift 2;;
-c|--clean) clean=1; shift 1;;
--enable-non-free) mainonly=0; shift 1;;
--mirror) MIRROR=$2; shift 2;;
@ -573,6 +628,7 @@ if [ "$arch" = "x86_64" ]; then
arch=amd64
fi
if [ "$interpreter" = "" ] ; then
if [ $hostarch = "i386" -a $arch = "amd64" ]; then
echo "can't create $arch container on $hostarch"
exit 1
@ -588,6 +644,17 @@ if [ $hostarch = "powerpc" -a $arch != "powerpc" ]; then
echo "can't create $arch container on $hostarch"
exit 1
fi
else
if ! file -b "${interpreter}" |grep -q "statically linked" ; then
echo "'${interpreter}' must be statically linked" 1>&2
exit 1
fi
interpreter_path=$(find_interpreter "$interpreter")
if [ $? -ne 0 ] ; then
echo "no binfmt interpreter using $(basename $interpreter)" 1>&2
exit 1
fi
fi
type debootstrap
if [ $? -ne 0 ]; then
@ -630,7 +697,7 @@ else
num_tty=4
fi
install_debian $rootfs $release $arch $LXC_CACHE_PATH
install_debian $rootfs $release $arch $LXC_CACHE_PATH "$interpreter" "$interpreter_path"
if [ $? -ne 0 ]; then
echo "failed to install debian"
exit 1
@ -650,7 +717,7 @@ fi
configure_debian_systemd $path $rootfs $config $num_tty
post_process ${rootfs} ${release} ${arch} ${hostarch} ${packages}
post_process ${rootfs} ${release} ${arch} ${hostarch} "${interpreter}" ${packages}
if [ ! -z "$clean" ]; then
clean || exit 1