Bug#983421: init-system-helpers: please respect DPKG_ROOT when checking for /usr/sbin/policy-rc.d

[Johannes Schauer Marin Rodrigues]

Dear init-system-helpers maintainers,

Quoting Johannes Schauer Marin Rodrigues (2021-08-20 21:33:00)
> Quoting Johannes 'josch' Schauer (2021-02-24 00:14:16)
> > if dpkg (since 1.18.5) is run with --force-script-chrootless, it sets the
> > variable DPKG_ROOT to the directory into which dpkg will install the
> > requested packages. This is useful for bootstrapping, creating chroots for
> > foreign architectures where utilities from inside the chroot cannot be
> > executed, avoiding dependency loops between postinst scripts, installation
> > without requiring superuser privileges and for creating installations that do
> > not even contain dpkg. See
> > https://wiki.debian.org/Teams/Dpkg/Spec/InstallBootstrap for more
> > information.
> > 
> > Currently, when maintainer scripts are run, /usr/sbin/policy-rc.d is
> > checked to avoid starting services. But instead, the scripts should
> > check "$DPKG_ROOT/usr/sbin/policy-rc.d". In normal situations, the
> > $DPKG_ROOT variable is empty, so this will work as usual. But if dpkg is
> > run with --root and --force-script-chrootless then /usr/sbin/policy-rc.d from
> > the new root directory will be used.
> 
> for your convenience, I have created a merge request on salsa which implements
> the changes that make DPKG_ROOT work in our testing environment.
> 
> https://salsa.debian.org/debian/init-system-helpers/-/merge_requests/12

the Release Team announced the freeze dates for bookworm, so I wanted to send
another friendly ping about this bug and the MR above. I think the longer this
change is tested the more chances I have to fix any bugs that my patch might've
introduced before the bookworm release.

If you don't have time to prepare the upload, I can also take care of that and
do a team upload just as Luca recently did.

What do you think?

Thanks!

cheers, josch
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