Bug#860246: [PATCH] udev.postinst: preserve virtio interfaces names on upgrades, on s390x.

[Michael Biebl]

Am 13.04.2017 um 15:46 schrieb Dimitri John Ledkov:
> diff --git a/debian/extra/write_persistent_net_s390x_virtio b/debian/extra/write_persistent_net_s390x_virtio
> new file mode 100755
> index 000000000..bbeb25085
> --- /dev/null
> +++ b/debian/extra/write_persistent_net_s390x_virtio
> @@ -0,0 +1,40 @@
> +#!/bin/sh
> +set -e
> +
> +#
> +# udevd since 232-20 learned to generate stable interface names for network
> +# interfaces in kvm/qemu. However, existing machines upgrading will be using
> +# the ethX names instead. The most risk-averse action is to encode
> +# "persistent-net-rules" like rules to keep the ethX names on upgrades, since
> +# the interface names (ethX) may be in use not only in /etc/network/interfaces
> +# but in other configurations too (daemons, firewalls, etc).
> +#
> +# This is a one time action, and can be removed after the next stable & LTS
> +# releases. (~ May 2018)
> +#
> +
> +rulesfile=/etc/udev/rules.d/70-persistent-net.rules
> +
> +if [ `uname -m` != 's390x' ]
> +then
> +    exit 0
> +fi
> +
> +if [ `systemd-detect-virt` != 'kvm' ]
> +then
> +    exit 0
> +fi

Keep in mind, that systemd-detect-virt is provided by the systemd
package and not guaranteed to be installed.

> diff --git a/debian/udev.install b/debian/udev.install
> index b0ab649fb..e5aae4daf 100644
> --- a/debian/udev.install
> +++ b/debian/udev.install
> @@ -22,3 +22,4 @@ usr/share/pkgconfig/udev.pc
>  ../../extra/rules/*.rules lib/udev/rules.d/
>  #../../extra/*.hwdb lib/udev/hwdb.d/
>  ../../extra/fbdev-blacklist.conf lib/modprobe.d/
> +../../extra/write_persistent_net_s390x_virtio usr/share/systemd/

Hm, maybe move that to a path which is udev specific, like /usr/lib/udev


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