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

[Johannes Schauer Marin Rodrigues]

Hi,

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

Thanks!

cheers, josch
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