[Lxc-users] * fix cached rootfs update * fix rootfs path * add handling of systemd (aka >f15)

[Serge Hallyn]

Quoting Ramez Hanna (rhanna at informatiq.org):
> On Mon, Mar 5, 2012 at 10:28 PM,  <rhanna at informatiq.org> wrote:
> > From: InformatiQ <rhanna at informatiq.org>
> >
> >
> > Signed-off-by: InformatiQ <rhanna at informatiq.org>
> > ---
> >  templates/lxc-fedora.in |   35 +++++++++++++++++++++++++++--------
> >  1 files changed, 27 insertions(+), 8 deletions(-)
> >
> > diff --git a/templates/lxc-fedora.in b/templates/lxc-fedora.in
> > index e7f42a6..3f50895 100644
> > --- a/templates/lxc-fedora.in
> > +++ b/templates/lxc-fedora.in
> > @@ -69,11 +69,6 @@ EOF
> >  127.0.0.1 localhost $name
> >  EOF
> >
> > -    sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.sysinit
> > -    sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.d/rc.sysinit
> > -    chroot ${rootfs_path} chkconfig udev-post off
> > -    chroot ${rootfs_path} chkconfig network on
> > -
> >     dev_path="${rootfs_path}/dev"
> >     rm -rf $dev_path
> >     mkdir -p $dev_path
> > @@ -99,6 +94,23 @@ EOF
> >
> >     return 0
> >  }
> > +configure_fedora_init()
> > +{
> > +    sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.sysinit
> > +    sed -i 's|.sbin.start_udev||' ${rootfs_path}/etc/rc.d/rc.sysinit
> > +    chroot ${rootfs_path} chkconfig udev-post off
> > +    chroot ${rootfs_path} chkconfig network on
> > +}
> > +
> > +configure_fedora_systemd()
> > +{
> > +    unlink ${rootfs_path}/etc/systemd/system/default.target
> > +    touch ${rootfs_path}/etc/fstab
> > +    chroot ${rootfs_path} ln -s /dev/null //etc/systemd/system/udev.service
> > +    chroot ${rootfs_path} ln -s /lib/systemd/system/multi-user.target /etc/systemd/system/default.target
> > +    #dependency on a device unit fails it specially that we disabled udev
> > +    sed -i 's/After=dev-%i.device/After=/' ${rootfs_path}/lib/systemd/system/getty\@.service
> > +}
> >
> >  download_fedora()
> >  {
> > @@ -170,7 +182,8 @@ copy_fedora()
> >
> >  update_fedora()
> >  {
> > -    chroot $cache/rootfs yum -y update
> > +    YUM="yum --installroot $cache/rootfs -y --nogpgcheck"
> > +    $YUM update
> >  }
> >
> >  install_fedora()
> > @@ -353,7 +366,7 @@ if [ "$(id -u)" != "0" ]; then
> >  fi
> >
> >
> > -rootfs_path=$path/$name/rootfs
> > +rootfs_path=$path/rootfs
> >  config_path=$default_path/$name
> >  cache=$cache_base/$release
> >
> > @@ -362,7 +375,7 @@ revert()
> >     echo "Interrupted, so cleaning up"
> >     lxc-destroy -n $name
> >     # maybe was interrupted before copy config
> > -    rm -rf $path/$name
> > +    rm -rf $path
> >     rm -rf $default_path/$name
> >     echo "exiting..."
> >     exit 1
> > @@ -388,6 +401,12 @@ if [ $? -ne 0 ]; then
> >     exit 1
> >  fi
> >
> > +type /bin/systemd >/dev/null 2>&1
> > +if [ $? -ne 0 ]; then
> > +    configure_fedora_init
> > +else
> > +    configure_fedora_systemd
> > +fi
> >
> >  if [ ! -z $clean ]; then
> >     clean || exit 1
> > --
> > 1.7.7.6
> >
> 
> there is only problem about systemd not addressed by this script
> is that it does mount /dev which stops getty from starting on tty1
> so either make it start on any tty higher than what your host is using
> and allow that in your lxc cgroup conf
> or mount the $rootfs/dev to a different block dev that way systemd
> won't mount /dev

Could the template create a 1M loopback file,
/var/lib/lxc/<container>/dev.loopback, populated with /dev and
mounted by a lxc.mount.entry?

-serge