[lxc-devel] [PATCH] lxc-debian: support systemd as PID 1

[Serge Hallyn]

Quoting Antonio Terceiro (terceiro at debian.org):
> Containers with systemd need a somewhat special setup, which I borrowed
> and adaptec from lxc-fedora. These changes are required so that Debian 8
> (jessie) containers work properly, and are a no-op for previous Debian
> versions.
> 
> Signed-off-by: Antonio Terceiro <terceiro at debian.org>

Michael and/or Stéphane may have other comments , but as you say this
will not regress non-systemd hosts so looks like a step in the right
direction to me, thanks.

Acked-by: Serge E. Hallyn <serge.hallyn at ubuntu.com>

> ---
>  templates/lxc-debian.in | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/templates/lxc-debian.in b/templates/lxc-debian.in
> index 5ffbe21..6864a98 100644
> --- a/templates/lxc-debian.in
> +++ b/templates/lxc-debian.in
> @@ -183,6 +183,34 @@ install_packages()
>      fi
>  }
>  
> +configure_debian_systemd()
> +{
> +    rootfs=$1
> +    init="$(chroot ${rootfs} dpkg-query --search /sbin/init | cut -d : -f 1)"
> +    if [ "$init" != "systemd-sysv" ]; then
> +       # systemd is not PID 1
> +       return
> +    fi
> +
> +    # This function has been copied and adapted from lxc-fedora
> +    rm -f ${rootfs}/etc/systemd/system/default.target
> +    touch ${rootfs}/etc/fstab
> +    chroot ${rootfs} ln -s /dev/null /etc/systemd/system/udev.service
> +    chroot ${rootfs} ln -s /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
> +    # Make systemd honor SIGPWR
> +    chroot ${rootfs} ln -s /lib/systemd/system/halt.target /etc/systemd/system/sigpwr.target
> +    sed -e 's/^ConditionPathExists=/# ConditionPathExists=/' \
> +        -e 's/After=dev-%i.device/After=/' \
> +        < ${rootfs}/lib/systemd/system/getty\@.service \
> +        > ${rootfs}/etc/systemd/system/getty\@.service
> +    # Setup getty service on the 4 ttys we are going to allow in the
> +    # default config.  Number should match lxc.tty
> +    ( cd ${rootfs}/etc/systemd/system/getty.target.wants
> +        for i in 1 2 3 4 ; do ln -sf ../getty\@.service getty at tty${i}.service; done )
> +
> +    return 0
> +}
> +
>  cleanup()
>  {
>      rm -rf $cache/partial-$release-$arch
> @@ -522,6 +550,8 @@ if [ $? -ne 0 ]; then
>      exit 1
>  fi
>  
> +configure_debian_systemd $rootfs
> +
>  copy_configuration $path $rootfs $name $arch
>  if [ $? -ne 0 ]; then
>      echo "failed write configuration file"
> -- 
> 2.1.3
> 
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