What the apt hook does is start pk4-generate-index in the background, see https://github.com/Debian/pk4/blob/master/pk4-generate-index.service.
What the dpkg hook does is start pk4-generate-index in the background after 60s (timeout is reset on a subsequent dpkg hook run). If you are interested in using pk4 on non-systemd machines, could you supply a tested patch for the apt and dpkg hooks adding fallbacks please? I’m not sure how to achieve the same functionality without systemd. I’d also be happy to add a Depends: systemd-sysv for now, which I believe should result in systemd being present and init. On Mon, Oct 23, 2017 at 12:53 AM, Axel Beckert <[email protected]> wrote: > Package: pk4 > Version: 2 > Severity: important > > Since the installation of pk4, "apt update" fails (i.e. exits with > return code != 0) for me on all systems where systemd is not the init > system. > > There are two types of failures, depending on the actual system. > > Systems where systemd is installed, but not the init system: > > Failed to start pk4-generate-index.service: Unknown unit: > pk4-generate-index.service > See system logs and 'systemctl status pk4-generate-index.service' for details. > Reading package lists... Done > E: Problem executing scripts APT::Update::Post-Invoke-Success '/bin/systemctl > start --no-block pk4-generate-index' > E: Sub-process returned an error code > > Systems where systemd is not installed at all: > > sh: 1: /bin/systemctl: not found > Reading package lists... Done > E: Problem executing scripts APT::Update::Post-Invoke-Success '/bin/systemctl > start --no-block pk4-generate-index' > E: Sub-process returned an error code > > -- System Information: > Debian Release: buster/sid > APT prefers unstable > APT policy: (990, 'unstable'), (600, 'testing'), (500, 'unstable-debug'), > (500, 'buildd-unstable'), (110, 'experimental'), (1, 'experimental-debug'), > (1, 'buildd-experimental') > Architecture: amd64 (x86_64) > > Kernel: Linux 4.13.0-rc7-amd64 (SMP w/8 CPU cores) > Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C.UTF-8 > (charmap=UTF-8) > Shell: /bin/sh linked to /bin/dash > Init: sysvinit (via /sbin/init) > > Versions of packages pk4 depends on: > ii debian-keyring 2017.08.28 > ii devscripts 2.17.10 > ii dpkg-dev 1.19.0.3 > ii libc6 2.24-17 > > pk4 recommends no packages. > > pk4 suggests no packages. > > -- no debconf information -- Best regards, Michael
