414 lines
8.8 KiB
Bash
Executable file
414 lines
8.8 KiB
Bash
Executable file
#!/bin/bash
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# SPDX-License-Identifier: MIT
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export DEBIAN_FRONTEND=noninteractive
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LXC_SELF_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
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LXC_BIN=/usr/local/bin
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LXC_CONTAINER_CONFIG_ALL="unprivileged lxc libvirt docker k8s"
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LXC_CONTAINER_CONFIG_DEFAULT="lxc libvirt docker"
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: ${LXC_SUDO:=}
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: ${LXC_CONTAINER_RELEASE:=bookworm}
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: ${LXC_CONTAINER_CONFIG:=$LXC_CONTAINER_CONFIG_DEFAULT}
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: ${LXC_HOME:=/home}
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: ${LXC_VERBOSE:=false}
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source /etc/os-release
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function lxc_release() {
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echo $VERSION_CODENAME
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}
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function lxc_template_release() {
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echo lxc-helpers-$LXC_CONTAINER_RELEASE
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}
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function lxc_root() {
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local name="$1"
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echo /var/lib/lxc/$name/rootfs
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}
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function lxc_config() {
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local name="$1"
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echo /var/lib/lxc/$name/config
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}
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function lxc_container_run() {
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local name="$1"
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shift
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$LXC_SUDO lxc-attach --clear-env --name $name -- "$@"
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}
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function lxc_container_run_script_as() {
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local name="$1"
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local user="$2"
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local script="$3"
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$LXC_SUDO chmod +x $(lxc_root $name)$script
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$LXC_SUDO lxc-attach --name $name -- sudo --user $user $script
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}
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function lxc_container_run_script() {
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local name="$1"
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local script="$2"
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$LXC_SUDO chmod +x $(lxc_root $name)$script
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lxc_container_run $name $script
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}
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function lxc_container_inside() {
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local name="$1"
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shift
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lxc_container_run $name $LXC_BIN/lxc-helpers.sh "$@"
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}
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function lxc_container_user_install() {
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local name="$1"
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local user_id="$2"
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local user="$3"
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if test "$user" = root ; then
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return
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fi
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local root=$(lxc_root $name)
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if ! $LXC_SUDO grep --quiet "^$user " $root/etc/sudoers ; then
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$LXC_SUDO tee $root/usr/local/bin/lxc-helpers-create-user.sh > /dev/null <<EOF
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#!/bin/bash
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set -ex
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mkdir -p $LXC_HOME
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useradd --base-dir $LXC_HOME --create-home --shell /bin/bash --uid $user_id $user
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for group in docker kvm libvirt ; do
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if grep --quiet \$group /etc/group ; then adduser $user \$group ; fi
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done
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echo "$user ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
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sudo --user $user ssh-keygen -b 2048 -N '' -f $LXC_HOME/$user/.ssh/id_rsa
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EOF
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lxc_container_run_script $name /usr/local/bin/lxc-helpers-create-user.sh
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fi
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}
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function lxc_maybe_sudo() {
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if test $(id -u) != 0 ; then
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LXC_SUDO=sudo
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fi
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}
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function lxc_prepare_environment() {
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lxc_maybe_sudo
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if ! $(which lxc-create > /dev/null) ; then
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$LXC_SUDO apt-get install -y -qq make git libvirt0 libpam-cgfs bridge-utils uidmap dnsmasq-base dnsmasq dnsmasq-utils qemu-user-static
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fi
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}
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function lxc_container_config_nesting() {
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echo 'security.nesting = true'
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}
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function lxc_container_config_cap() {
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echo 'lxc.cap.drop ='
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}
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function lxc_container_config_net() {
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cat <<EOF
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#
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# /dev/net
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#
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lxc.cgroup2.devices.allow = c 10:200 rwm
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lxc.mount.entry = /dev/net dev/net none bind,create=dir 0 0
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EOF
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}
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function lxc_container_config_kvm() {
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cat <<EOF
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#
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# /dev/kvm
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#
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lxc.cgroup2.devices.allow = c 10:232 rwm
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lxc.mount.entry = /dev/kvm dev/kvm none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_loop() {
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cat <<EOF
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#
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# /dev/loop
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#
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lxc.cgroup2.devices.allow = c 10:237 rwm
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lxc.cgroup2.devices.allow = b 7:* rwm
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lxc.mount.entry = /dev/loop-control dev/loop-control none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_mapper() {
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cat <<EOF
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#
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# /dev/mapper
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#
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lxc.cgroup2.devices.allow = c 10:236 rwm
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lxc.mount.entry = /dev/mapper dev/mapper none bind,create=dir 0 0
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EOF
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}
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function lxc_container_config_fuse() {
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cat <<EOF
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#
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# /dev/fuse
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#
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lxc.cgroup2.devices.allow = b 10:229 rwm
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lxc.mount.entry = /dev/fuse dev/fuse none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_kmsg() {
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cat <<EOF
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#
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# kmsg
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#
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lxc.cgroup2.devices.allow = c 1:11 rwm
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lxc.mount.entry = /dev/kmsg dev/kmsg none bind,create=file 0 0
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EOF
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}
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function lxc_container_config_proc() {
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cat <<EOF
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#
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# /proc
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#
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#
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# Only because k8s tries to write /proc/sys/vm/overcommit_memory
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# is there a way to only allow that? Would it be enough for k8s?
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#
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lxc.mount.auto = proc:rw
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EOF
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}
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function lxc_container_config() {
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for config in "$@" ; do
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case $config in
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unprivileged)
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;;
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lxc)
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echo nesting
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echo cap
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;;
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docker)
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echo net
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;;
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libvirt)
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echo cap
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echo kvm
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echo loop
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echo mapper
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echo fuse
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;;
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k8s)
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echo cap
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echo loop
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echo mapper
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echo fuse
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echo kmsg
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echo proc
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;;
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*)
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echo "$config unknown ($LXC_CONTAINER_CONFIG_ALL)"
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return 1
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;;
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esac
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done | sort -u | while read config ; do
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echo "#"
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echo "# include $config config snippet"
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echo "#"
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lxc_container_config_$config
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done
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}
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function lxc_container_configure() {
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local name="$1"
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lxc_container_config $LXC_CONTAINER_CONFIG | $LXC_SUDO tee -a $(lxc_config $name)
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}
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function lxc_container_install_lxc_helpers() {
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local name="$1"
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$LXC_SUDO cp -a $LXC_SELF_DIR/lxc-helpers*.sh $root/$LXC_BIN
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#
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# Wait for the network to come up
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#
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local wait_networking=$(lxc_root $name)/usr/local/bin/lxc-helpers-wait-networking.sh
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$LXC_SUDO tee $wait_networking > /dev/null <<'EOF'
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#!/bin/sh -e
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for d in $(seq 60); do
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getent hosts wikipedia.org > /dev/null && break
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sleep 1
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done
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getent hosts wikipedia.org > /dev/null || getent hosts wikipedia.org
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EOF
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$LXC_SUDO chmod +x $wait_networking
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}
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function lxc_container_create() {
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local name="$1"
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lxc_prepare_environment
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lxc_build_template $(lxc_template_release) "$name"
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}
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function lxc_container_mount() {
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local name="$1"
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local dir="$2"
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local config=$(lxc_config $name)
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if ! $LXC_SUDO grep --quiet "lxc.mount.entry = $dir" $config ; then
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local relative_dir=${dir##/}
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$LXC_SUDO tee -a $config > /dev/null <<< "lxc.mount.entry = $dir $relative_dir none bind,create=dir 0 0"
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fi
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}
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function lxc_container_start() {
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local name="$1"
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if lxc_running $name ; then
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return
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fi
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local logs
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if $LXC_VERBOSE; then
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logs="--logfile=/dev/tty"
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fi
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$LXC_SUDO lxc-start $logs $name
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$LXC_SUDO lxc-wait --name $name --state RUNNING
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lxc_container_run $name /usr/local/bin/lxc-helpers-wait-networking.sh
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}
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function lxc_container_stop() {
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local name="$1"
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$LXC_SUDO lxc-ls -1 --running --filter="^$name" | while read container ; do
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$LXC_SUDO lxc-stop --kill --name="$container"
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done
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}
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function lxc_container_destroy() {
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local name="$1"
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local root="$2"
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if lxc_exists "$name" ; then
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lxc_container_stop $name $root
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$LXC_SUDO lxc-destroy --force --name="$name"
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fi
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}
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function lxc_exists() {
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local name="$1"
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test "$($LXC_SUDO lxc-ls --filter=^$name\$)"
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}
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function lxc_running() {
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local name="$1"
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test "$($LXC_SUDO lxc-ls --running --filter=^$name\$)"
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}
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function lxc_build_template_release() {
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local name="$(lxc_template_release)"
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if lxc_exists $name ; then
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return
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fi
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local root=$(lxc_root $name)
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$LXC_SUDO lxc-create --name $name --template debian -- --release=$LXC_CONTAINER_RELEASE
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echo 'lxc.apparmor.profile = unconfined' | $LXC_SUDO tee -a $(lxc_config $name)
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lxc_container_install_lxc_helpers $name
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lxc_container_start $name
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lxc_container_run $name apt-get update -qq
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lxc_apt_install $name sudo git python3
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lxc_container_stop $name
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}
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function lxc_build_template() {
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local name="$1"
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local newname="$2"
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if lxc_exists $newname ; then
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return
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fi
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if test "$name" = "$(lxc_template_release)" ; then
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lxc_build_template_release
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fi
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if ! $LXC_SUDO lxc-copy --name=$name --newname=$newname ; then
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echo lxc-copy --name=$name --newname=$newname failed
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return 1
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fi
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lxc_container_configure $name
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}
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function lxc_apt_install() {
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local name="$1"
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shift
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lxc_container_inside $name lxc_apt_install_inside "$@"
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}
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function lxc_apt_install_inside() {
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apt-get install -y -qq "$@"
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}
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function lxc_install_lxc() {
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local name="$1"
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local prefix="$2"
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lxc_container_inside $name lxc_install_lxc_inside $prefix
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}
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function lxc_install_lxc_inside() {
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local prefix="$1"
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local packages="make git libvirt0 libpam-cgfs bridge-utils uidmap dnsmasq-base dnsmasq dnsmasq-utils qemu-user-static lxc-templates debootstrap"
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if test "$(lxc_release)" = bookworm ; then
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packages="$packages distro-info"
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fi
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lxc_apt_install_inside $packages
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if ! grep --quiet LXC_ADDR=.$prefix.1. /etc/default/lxc-net ; then
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systemctl disable --now dnsmasq
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apt-get install -y -qq lxc
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systemctl stop lxc-net
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sed -i -e '/ConditionVirtualization/d' /usr/lib/systemd/system/lxc-net.service
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systemctl daemon-reload
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cat >> /etc/default/lxc-net <<EOF
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LXC_ADDR="$prefix.1"
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LXC_NETMASK="255.255.255.0"
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LXC_NETWORK="$prefix.0/24"
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LXC_DHCP_RANGE="$prefix.2,$prefix.254"
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LXC_DHCP_MAX="253"
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EOF
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systemctl start lxc-net
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fi
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}
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function lxc_install_docker() {
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local name="$1"
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lxc_container_inside $name lxc_install_docker_inside
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}
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function lxc_install_docker_inside() {
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lxc_apt_install_inside docker.io docker-compose
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}
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