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Re: installing minimal systems with weeed out /u/s/d (was: trimming changelogs)


Quoting Marc Haber (2020-03-22 12:20:37)
> On Fri, 20 Mar 2020 10:16:00 +0100, David Kalnischkies
> <david@kalnischkies.de> wrote:
> >On Fri, Mar 20, 2020 at 12:50:29AM +0100, Adam Borowski wrote:
> >> In the rush for cutting away small bits of minbase, it looks like we forgot
> >> a big pile of junk: /usr/share/doc/
> >
> >Honestly, on space constraint systems, isn't the whole /usr/share/doc
> >directory "junk". Probably not the solution for everyone or as
> >a default, but I want to highlight that dpkg supports excluding files
> >and entire paths from being unpacked:
> >
> >$ cat /etc/dpkg/dpkg.cfg.d/01_exclude_paths
> >| path-exclude /usr/share/doc/*
> >| path-include /usr/share/doc/*/copyright
> >|
> >| path-exclude /usr/share/locale/*
> >| path-include /usr/share/locale/en*
> >| path-exclude /usr/share/man/*
> >| \u2026
> Is there any canonical way to have a new system/chroot installed that
> way? Debootstrap seems to make things particularly hard without using
> internal interfaces (#811269, #864981, #871255, the oldest of those
> having had its fourth birthday recently, with only a single
> less-than-helpful maintainer interaction since then).
> How would I do that from the very beginning?

in practice, tools like debootstrap first extract the data part of the base
*.deb packages using "dpkg-deb --fsys-tarfile", also called first-stage
installation.  Afterwards, packages are installed using "dpkg --install" from
inside the chroot (this is often called the second stage). Since package data
was already unpacked, the "dpkg --install" command will *not* remove the files
indicated by --path-excluded. To make dpkg remove these files, a second "dpkg
--install" has to be performed.  Since debootstrap cannot do that yet (as
indicated by the open bugs you cite), you'd have to chroot into your
debootstrap rootfs and call "dpkg --install" again with all the packages
affected by your chosen --path-exclude option.

If you don't want to do this manually, then you can also use mmdebstrap instead
of debootstrap and use its --dpkgopt option. For examples look at its man page
or in the other message I wrote to this thread.


cheers, josch

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