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#!/bin/sh
install_alpine() {
rootfs="$1"
mkdir -p "$rootfs"/etc/apk || return 1
cp -r ${keys_dir:-/etc/apk/keys} "$rootfs"/etc/apk/
if [ -n "$repository" ]; then
echo "$repository" > "$rootfs"/etc/apk/repositories
else
cp /etc/apk/repositories "$rootfs"/etc/apk/repositories || return 1
fi
${APK:-apk} add -U --initdb --root $rootfs alpine-base
}
configure_alpine() {
rootfs="$1"
echo "Setting up /etc/inittab"
cat >"$rootfs"/etc/inittab<<EOF
::sysinit:/sbin/rc sysinit
::wait:/sbin/rc default
tty1:12345:respawn:/sbin/getty 38400 tty1
::ctrlaltdel:/sbin/reboot
::shutdown:/sbin/rc shutdown
EOF
# set up nameserver
grep nameserver /etc/resolv.conf > "$rootfs/etc/resolv.conf"
# configure the network using the dhcp
# note that lxc will set up lo interface
cat <<EOF > $rootfs/etc/network/interfaces
#auto lo
iface lo inet loopback
auto eth0
iface eth0 inet dhcp
EOF
# set the hostname
echo $hostname > $rootfs/etc/hostname
# missing device nodes
echo "Setting up device nodes"
mkdir -p -m 755 "$rootfs/dev/pts"
mkdir -p -m 1777 "$rootfs/dev/shm"
mknod -m 666 "$rootfs/dev/full" c 1 7
mknod -m 666 "$rootfs/dev/random" c 1 8
mknod -m 666 "$rootfs/dev/urandom" c 1 9
mknod -m 666 "$rootfs/dev/tty0" c 4 0
mknod -m 666 "$rootfs/dev/tty1" c 4 1
mknod -m 666 "$rootfs/dev/tty2" c 4 2
mknod -m 666 "$rootfs/dev/tty3" c 4 3
mknod -m 666 "$rootfs/dev/tty4" c 4 4
# mknod -m 600 "$rootfs/dev/initctl" p
mknod -m 666 "$rootfs/dev/tty" c 5 0
mknod -m 666 "$rootfs/dev/console" c 5 1
mknod -m 666 "$rootfs/dev/ptmx" c 5 2
# start services
ln -s /etc/init.d/syslog "$rootfs"/etc/runlevels/default/syslog
return 0
}
copy_configuration() {
path=$1
rootfs=$2
hostname=$3
grep -q "^lxc.rootfs" $path/config 2>/dev/null \
|| echo "lxc.rootfs = $rootfs" >> $path/config
cat <<EOF >> $path/config
lxc.tty = 4
lxc.pts = 1024
lxc.utsname = $hostname
# When using LXC with apparmor, uncomment the next line to run unconfined:
#lxc.aa_profile = unconfined
# network interface
lxc.network.name = eth0
lxc.network.type = veth
lxc.network.flags = up
# enable for bridging
#lxc.network.link = br0
#lxc.network.ipv4 = n.n.n.n
#lxc.network.ipv4.gateway = auto
# devices
lxc.cgroup.devices.deny = a
# /dev/null and zero
lxc.cgroup.devices.allow = c 1:3 rwm
lxc.cgroup.devices.allow = c 1:5 rwm
# consoles
lxc.cgroup.devices.allow = c 5:1 rwm
lxc.cgroup.devices.allow = c 5:0 rwm
lxc.cgroup.devices.allow = c 4:0 rwm
lxc.cgroup.devices.allow = c 4:1 rwm
# /dev/{,u}random
lxc.cgroup.devices.allow = c 1:9 rwm
lxc.cgroup.devices.allow = c 1:8 rwm
lxc.cgroup.devices.allow = c 136:* rwm
lxc.cgroup.devices.allow = c 5:2 rwm
# rtc
lxc.cgroup.devices.allow = c 254:0 rwm
# mounts point
lxc.mount.entry=proc proc proc nodev,noexec,nosuid 0 0
lxc.mount.entry=run run tmpfs nodev,noexec,nosuid,relatime,size=1m,mode=0755 0 0
lxc.mount.entry=none dev/pts devpts gid=5,mode=620 0 0
EOF
return 0
}
die() {
echo "$@" >&2
exit 1
}
usage() {
echo "Usage: $(basename $0) [-h|--help] -p|--path <path> -n|--name <name>" >&2
}
usage_err() {
usage
exit 1
}
optarg_check() {
if [ -z "$2" ]; then
usage_err "option '$1' requires an argument"
fi
}
default_path=/var/lib/lxc
while [ $# -gt 0 ]; do
opt="$1"
shift
case "$opt" in
-h|--help)
usage
exit 0
;;
-n|--name)
optarg_check $opt "$1"
name=$1
shift
;;
-p|--path)
optarg_check $opt "$1"
path=$1
shift
;;
--)
break;;
--*=*)
# split --myopt=foo=bar into --myopt foo=bar
set -- ${opt%=*} ${opt#*=} "$@"
;;
-?)
usage_err "unknown option '$opt'"
;;
-*)
# split opts -abc into -a -b -c
set -- $(echo "${opt#-}" | sed 's/\(.\)/ -\1/g') "$@"
;;
*)
usage
exit 1
;;
esac
done
[ -z "$name" ] && usage_err
if [ -z "${path}" ]; then
path="${default_path}/${name}"
fi
rootfs=`awk -F= '$1 ~ /^lxc.rootfs/ { print $2 }' "$path/config" 2>/dev/null`
if [ -z "$rootfs" ]; then
rootfs="${path}/rootfs"
fi
install_alpine "$rootfs" || die "Failed to install rootfs for $name"
configure_alpine "$rootfs" "$name" || die "Failed to configure $name"
copy_configuration "$path" "$rootfs" "$name"
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