[elbe-devel] [PATCH 2/2] init init-elbe.sh.mako: name network interface host0 and use dhcp on it

[Manuel Traut]

On 14:43 Wed 10 Apr     , Torben Hohn wrote:
> the "persistent" naming of network interfaces is not persistent, when
> different VM configurations come into play.
> 
> Somehow 33988ebe3d0b ("Enable initvm creation with newer qemu versions")
> changed the network device name to enp4 during initvm installation in qemu.
> When running with libvirt, it is enp3 again. That leaves the network
> unconfigured.
> 
> Fix this once for all, by creating /etc/systemd/network/10-host.link
> which matched the macaddr and renames the interface to host0.
> Then use /etc/network/interfaces.d/host0 so that it gets configured using
> dhcp.
> 
> This can potentially also fix a situation, where the initvm is run in
> vmware or a different hypervisor.
> 
> Signed-off-by: Torben Hohn <torben.hohn at linutronix.de>

Reviewed-by: Manuel Traut <manut at linutronix.de>

> ---
>  elbepack/init/init-elbe.sh.mako | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> diff --git a/elbepack/init/init-elbe.sh.mako b/elbepack/init/init-elbe.sh.mako
> index 8fb0e6d6..bad46bfe 100644
> --- a/elbepack/init/init-elbe.sh.mako
> +++ b/elbepack/init/init-elbe.sh.mako
> @@ -19,6 +19,8 @@ if not opt.build_bin:
>  
>  if not opt.build_sources:
>    buildrepo_opts += '--skip-build-source'
> +
> +nicmac = prj.text('buildimage/NIC/MAC', default=defs, key='nicmac')
>  %>
>  
>  # First unset the variables which are set by the debian-installer
> @@ -39,6 +41,23 @@ mkdir /buildenv/var/cache/elbe/installer
>  cp initrd-cdrom.gz /buildenv/var/cache/elbe/installer
>  cp vmlinuz /buildenv/var/cache/elbe/installer
>  
> +cat <<EOF > /buildenv/etc/systemd/network/10-host.link
> +[Match]
> +MACAddress=${nicmac}
> +
> +[Link]
> +NamePolicy=
> +Name=host0
> +EOF
> +
> +cat <<EOF > /buildenv/etc/network/interfaces.d/host0
> +# The primary network interface
> +allow-hotplug host0
> +iface host0 inet dhcp
> +EOF
> +
> +in-target update-initramfs -u
> +
>  % if opt.devel:
>     mkdir /buildenv/var/cache/elbe/devel
>     tar xj -f elbe-devel.tar.bz2 -C /buildenv/var/cache/elbe/devel
> -- 
> 2.11.0
>