On Mon, 10 Jul 2023 17:14:48 +0100 Steve McIntyre <st...@einval.com>
> Hi, and thanks for your bug report!
> On Mon, Jul 10, 2023 at 05:27:50PM +0200, yogg wrote:
> >Package: installation-reports
> >Severity: serious
> >Tags: d-i
> >Justification: https://wiki.debian.org/MachineId
> >
> ...
> >After installation was finished and the system has been restarted
> >files "/etc/machine-id" and "/var/lib/dbus/machine-id" are not
> >in any way (no soft or hardlink) and the ID inside the files differ
> >from each other.
> I've confirmed this bug just now, doing a clean installation from the
> 12.0.0 amd64 netinst.

As a wild guess, maybe the split of src:dbus into multiple packages
affected the order in which the postinsts run, and now systemd's runs
first and creates /etc/machine-id, and then dbus-daemon's runs and
creates /var/lib/dbus/machine-id.

There is a tmpfiles.d shipped by dbus-daemon that creates
/var/lib/dbus/machine-id as a symlink to /etc/machine-id if it exists,
but this snippet runs _after_ the dbus-uuidgen so effectively it is
always a no-op on package install:

$ cat /var/lib/dpkg/info/dbus-daemon.postinst 

set -e

if [ "$1" = configure ]; then
    # This is idempotent, so it's OK to do every time. The system bus' init
    # script does this anyway, but you also have to do this before a session
    # bus will work on non-systemd systems, so we do this here for the
    # benefit of people starting a temporary session bus in a chroot.
    mkdir -p "${DPKG_ROOT:-/}var/lib/dbus"
    dbus-uuidgen --ensure="${DPKG_ROOT:-/}var/lib/dbus/machine-id"

# Automatically added by dh_installtmpfiles/13.11.4
if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = 
"abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
        if [ -x "$(command -v systemd-tmpfiles)" ]; then
                systemd-tmpfiles ${DPKG_ROOT:+--root="$DPKG_ROOT"} --create 
dbus.conf >/dev/null || true
# End automatically added section

It seems to me a safe way to fix this and do the right thing is to swap
the #DEBHELPER# token and the manual dbus-uuidgen block in dbus-
daemon's postinst. Then on systemd systems the tmpfiles will win and on
other systems dbus-uuidgen will do its job.

Kind regards,
Luca Boccassi

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