mirror of
https://code.forgejo.org/actions/setup-forgejo
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sync lxc-helpers b0766388a2624bc56258053576c7c09dba2e7cf5
This commit is contained in:
parent
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299
lxc-helpers-lib.sh
Executable file
299
lxc-helpers-lib.sh
Executable file
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#!/bin/bash
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# SPDX-License-Identifier: MIT
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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_SUDO:=}
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: ${LXC_CONTAINER_RELEASE:=bookworm}
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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_configure() {
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local name="$1"
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$LXC_SUDO tee -a $(lxc_config $name) > /dev/null <<'EOF'
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security.nesting = true
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lxc.cap.drop =
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lxc.apparmor.profile = unconfined
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#
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# /dev/net (docker won't work without /dev/net/tun)
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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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#
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# /dev/kvm (libvirt / kvm won't work without /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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#
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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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#
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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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#
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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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# 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_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 $name)
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local packages="sudo,git,python3"
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$LXC_SUDO lxc-create --name $name --template debian -- --release=$LXC_CONTAINER_RELEASE --packages="$packages"
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$LXC_SUDO cp -a $LXC_SELF_DIR/lxc-helpers*.sh $root/$LXC_BIN
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lxc_container_configure $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" = "$(lxc_template_release)" ; then
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lxc_build_template_release
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fi
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$LXC_SUDO lxc-copy --name=$name --newname=$newname
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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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DEBIAN_FRONTEND=noninteractive 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="$1"
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local packages="make git libvirt0 libpam-cgfs bridge-utils uidmap dnsmasq-base dnsmasq dnsmasq-utils qemu-user-static"
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if test "$(lxc_release)" = bookworm ; then
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packages="$packages lxc-templates debootstrap distro-info"
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fi
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lxc_apt_install_inside $packages
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if ! systemctl is-active --quiet 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' $root/usr/lib/systemd/system/lxc-net.service
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systemctl daemon-reload
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cat >> /etc/default/lxc-net <<EOF
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LXC_ADDR="$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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129
lxc-helpers.sh
Executable file
129
lxc-helpers.sh
Executable file
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@ -0,0 +1,129 @@
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#!/usr/bin/env bash
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# SPDX-License-Identifier: MIT
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set -e
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source $(dirname $0)/lxc-helpers-lib.sh
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function verbose() {
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set -x
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PS4='${BASH_SOURCE[0]}:$LINENO: ${FUNCNAME[0]}: '
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LXC_VERBOSE=true
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}
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function help() {
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cat <<'EOF'
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lxc-helpers - LXC container management helpers
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SYNOPSIS
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lxc-helpers [-v|--verbose] [-h|--help]
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[-o|--os {bookworm|bullseye} (default bookworm)]
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command [arguments]
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DESCRIPTION
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A thin shell based layer on top of LXC to create, populate, run and
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destroy LXC containers. A container is created from a copy of an
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existing container.
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CREATE AND DESTROY
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lxc_prepare_environment
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Install LXC dependencies.
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lxc_template_release
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Echo the name of the container for the Operating System
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specified with `--os`.
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lxc_build_template `existing_container` `new_container`
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Copy `existing_container` into `new_container`. If
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`existing_container` is equal to $(lxc_template_release) it
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will be created on demand.
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lxc_container_mount `name` `path`
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Configure `name` container to bind mount `path` so that it is
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also accessible at `path` from within the container.
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lxc_container_start `name`
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Start the `name` container.
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lxc_container_stop `name`
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Unmount all bind mounted directories and stop the `name`
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container.
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lxc_container_destroy `name`
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Call lxc_container_stop `name` and destroy the container.
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ACTIONS IN THE CONTAINER
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For some command lxc_something `name` that can be called from outside the container
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there is an equivalent function lxc_something_inside that can be called from inside
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the container.
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lxc_install_lxc `name` `prefix`
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lxc_install_lxc_inside `prefix`
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Install LXC in the `name` container to allow the creation of
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named containers. `prefix` is a class C IP prefix from which
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containers will obtain their IP (for instance 10.40.50).
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lxc_container_run_script `name` `path`
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lxc_container_run_script_as `name` `user` `path`
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Run the script found at `path` within the `name` container. The
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environment is cleared before running the script. The first form
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will run as root, the second form will impersonate `user`.
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lxc_container_user_install `name` `user_id` `user` [`homedir` default `/home`]
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Create the `user` with `user_id` in the `name` container with a
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HOME at `/homedir/user`. Passwordless sudo permissions are
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granted to `user`. It is made a member of the groups docker, kvm
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and libvirt if they exist already. A SSH key is created.
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Example: lxc_container_user_install mycontainer $(id -u) $(USER)
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EOF
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}
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function main() {
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local options=$(getopt -o hvo --long help,verbose,os: -- "$@")
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[ $? -eq 0 ] || {
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echo "Incorrect options provided"
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exit 1
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}
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eval set -- "$options"
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while true; do
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case "$1" in
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-v | --verbose)
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verbose
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;;
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-h | --help)
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help
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;;
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-o | --os)
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LXC_CONTAINER_RELEASE=$2
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shift
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;;
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--)
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shift
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break
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;;
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esac
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shift
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done
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lxc_maybe_sudo
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"$@"
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}
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main "$@"
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