Bug#902287: systemctl unmask --runtime no longer supported

[Michael Biebl]

Package: systemd
Version: 239-1
Severity: serious

upstream has removed support for systemctl unmask --runtime [1]

According to codesearch we currently have two packages in the archive
using unmask --runtime: avahi and policykit-1

https://sources.debian.org/src/avahi/0.7-3.1/debian/avahi-daemon.postrm/?hl=7#L7

https://sources.debian.org/src/policykit-1/0.105-20/debian/policykit-1.postinst/?hl=58#L58
https://sources.debian.org/src/policykit-1/0.105-20/debian/policykit-1.preinst/?hl=15#L15

A corresponding upstream bug report for systemd has been filed [2].
If upstream does not agree with reverting this behaviour change, we'll
have to change both avahi and policykit-1 (sid and exp) to clean up the
runtime masks manually. The systemd package will then have to gain
appropriate Breaks.

[1] https://github.com/systemd/systemd/commit/4910b35078ad24dcbc63f372b2fee087640201d0
[2] https://github.com/systemd/systemd/issues/9393
-- Package-specific info:

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (200, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.16.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages systemd depends on:
ii  adduser          3.117
ii  libacl1          2.2.52-3+b1
ii  libapparmor1     2.12-4
ii  libaudit1        1:2.8.3-1
ii  libblkid1        2.32-0.1
ii  libc6            2.27-3
ii  libcap2          1:2.25-1.2
ii  libcryptsetup12  2:2.0.3-3
ii  libgcrypt20      1.8.3-1
ii  libgnutls30      3.5.18-1
ii  libgpg-error0    1.31-1
ii  libidn11         1.33-2.2
ii  libip4tc0        1.6.2-1
ii  libkmod2         25-1
ii  liblz4-1         1.8.2-1
ii  liblzma5         5.2.2-1.3
ii  libmount1        2.32-0.1
ii  libpam0g         1.1.8-3.7
ii  libseccomp2      2.3.3-2
ii  libselinux1      2.8-1
ii  libsystemd0      239-1
ii  mount            2.32-0.1
ii  procps           2:3.3.15-2
ii  util-linux       2.32-0.1

Versions of packages systemd recommends:
ii  dbus            1.12.8-3
ii  libpam-systemd  239-1

Versions of packages systemd suggests:
ii  policykit-1        0.105-20
ii  systemd-container  239-1

Versions of packages systemd is related to:
pn  dracut           <none>
ii  initramfs-tools  0.130
ii  udev             239-1

-- no debconf information