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Groups > linux.debian.maint.dpkg > #12010

Re: DEP 17: Improve support for directory aliasing in dpkg

From Raphael Hertzog <hertzog@debian.org>
Newsgroups linux.debian.maint.dpkg, linux.debian.devel
Subject Re: DEP 17: Improve support for directory aliasing in dpkg
Date 2023-05-02 12:40 +0200
Message-ID <GqVAl-612L-1@gated-at.bofh.it> (permalink)
References (2 earlier) <Gn0ff-3x3G-5@gated-at.bofh.it> <Gnj8d-3IHC-1@gated-at.bofh.it> <Gnkxj-3JHS-1@gated-at.bofh.it> <Gowd3-4u2x-17@gated-at.bofh.it> <GoJtD-4CNn-3@gated-at.bofh.it>
Organization linux.* mail to news gateway

Cross-posted to 2 groups.

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Hello,

On Wed, 26 Apr 2023, Simon Richter wrote:
> > This and /bin/sh is the kind of files I'd consider important. And then
> > upon thinking further it became more and more difficult for me to make
> > sense of the objection. On a merged system, we can just move that file
> > to its canonical location without having any trouble even with an
> > unmodified dpkg. So from my pov, the question about important files can
> > be disregarded. I hope Simon Richter agrees.
> 
> Yes, the relevant code at
> 
>     https://github.com/guillemj/dpkg/blob/main/src/main/unpack.c#L749
> 
> already handles moving a file inside the same package, and that has
> existed for some time, that's why I use two packages for the PoC.

Hum... why aren't we improving this part of the code?

We don't want to stat all the files in all packages but we could do better:
if we are about to remove an old file that is available through a
symlinked directory, we could check the new name of the file and see if
it's available in some package... and if yes just forget the file without
removing it.

This file removal is the reason of the moratorium and incuring some extra
cost in some specific cases (installation through directory symlinks which
is not the default case, and would not affect us after the migration is
complete) seems certainly fair.

The cost of analyzing directory components is a cost that we will have on
all dpkg invocations but it doesn't seem unreasonable to me. We could also
restrict it to the top-level directories to make it negligible as this
is the only transition that we care about here.

Cheers,
-- 
  ⢀⣴⠾⠻⢶⣦⠀   Raphaël Hertzog <hertzog@debian.org>
  ⣾⠁⢠⠒⠀⣿⡁
  ⢿⡄⠘⠷⠚⠋    The Debian Handbook: https://debian-handbook.info/get/
  ⠈⠳⣄⠀⠀⠀⠀   Debian Long Term Support: https://deb.li/LTS

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Thread

DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-03 14:10 +0200
  Re: DEP 17: Improve support for directory aliasing in dpkg Guillem Jover <guillem@debian.org> - 2023-04-08 04:40 +0200
    Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-22 13:00 +0200
    Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-22 13:00 +0200
      Re: DEP 17: Improve support for directory aliasing in dpkg Guillem Jover <guillem@debian.org> - 2023-06-21 13:40 +0200
        Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-06-21 16:30 +0200
          Re: DEP 17: Improve support for directory aliasing in dpkg Guillem Jover <guillem@debian.org> - 2023-07-10 11:30 +0200
  Re: DEP 17: Improve support for directory aliasing in dpkg Raphael Hertzog <hertzog@debian.org> - 2023-04-21 14:20 +0200
    Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <luca.boccassi@gmail.com> - 2023-04-21 16:50 +0200
      Re: DEP 17: Improve support for directory aliasing in dpkg Simon McVittie <smcv@debian.org> - 2023-04-22 12:50 +0200
        Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <luca.boccassi@gmail.com> - 2023-04-22 14:30 +0200
        Re: DEP 17: Improve support for directory aliasing in dpkg Sam Hartman <hartmans@debian.org> - 2023-04-26 15:20 +0200
          Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-27 00:50 +0200
        Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-27 15:40 +0200
      Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-22 13:00 +0200
        Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <luca.boccassi@gmail.com> - 2023-04-22 14:30 +0200
          Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-25 21:10 +0200
            Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-04-25 22:40 +0200
              Re: DEP 17: Improve support for directory aliasing in dpkg Raphael Hertzog <hertzog@debian.org> - 2023-04-26 15:20 +0200
            Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-04-26 11:20 +0200
              Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-04-26 11:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Sven Joachim <svenjoac@gmx.de> - 2023-04-26 18:30 +0200
              Re: DEP 17: Improve support for directory aliasing in dpkg Raphael Hertzog <hertzog@debian.org> - 2023-05-02 12:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-02 15:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Raphael Hertzog <hertzog@debian.org> - 2023-05-03 10:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-03 12:30 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-05-03 20:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-04 19:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Timo Röhling <roehling@debian.org> - 2023-05-05 11:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-05-05 14:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Andreas Metzler <ametzler@bebt.de> - 2023-05-05 18:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-06 00:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-05-06 07:30 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-06 14:30 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-05-06 17:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-06 18:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-06 21:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-06 21:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-06 21:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-06 23:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Sean Whitton <spwhitton@spwhitton.name> - 2023-05-07 01:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-07 13:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Sean Whitton <spwhitton@spwhitton.name> - 2023-05-08 20:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-09 03:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-09 06:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-09 13:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-07 08:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Ansgar <ansgar@43-1.org> - 2023-05-07 09:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Ansgar <ansgar@43-1.org> - 2023-05-07 11:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-07 13:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-05-08 05:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-08 14:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-05-08 14:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Sean Whitton <spwhitton@spwhitton.name> - 2023-05-10 17:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Ansgar <ansgar@43-1.org> - 2023-05-10 21:30 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Russ Allbery <rra@debian.org> - 2023-05-10 23:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Ansgar <ansgar@43-1.org> - 2023-05-10 23:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Russ Allbery <rra@debian.org> - 2023-05-10 23:40 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) (was: Re: DEP 17: Improve support for directory aliasing in dpkg) Ansgar <ansgar@43-1.org> - 2023-05-11 00:00 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Emilio Pozuelo Monfort <pochu@debian.org> - 2023-05-11 12:40 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Simon Richter <sjr@debian.org> - 2023-05-11 14:30 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Luca Boccassi <bluca@debian.org> - 2023-05-11 20:00 +0200
                Re: dpkg currently warning about merged-usr systems (revisited) Simon Richter <sjr@debian.org> - 2023-05-12 14:20 +0200
                Re: dpkg currently warning about merged-usr systems (revisited) Luca Boccassi <bluca@debian.org> - 2023-05-12 17:10 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Simon Richter <sjr@debian.org> - 2023-05-12 14:30 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Luca Boccassi <bluca@debian.org> - 2023-05-12 15:10 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Matthew Vernon <matthew@debian.org> - 2023-05-25 14:10 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) (was: Re: DEP 17: Improve support for directory aliasing in dpkg) Helmut Grohne <helmut@subdivi.de> - 2023-05-21 16:30 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) (was: Re: DEP 17: Improve support for directory aliasing in dpkg) Ansgar <ansgar@43-1.org> - 2023-05-21 17:00 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Ansgar <ansgar@43-1.org> - 2023-06-07 06:40 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Ansgar <ansgar@43-1.org> - 2023-06-13 21:20 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Matthew Garrett <mjg59@srcf.ucam.org> - 2023-06-13 22:10 +0200
                Bug#1035904: dpkg currently warning about merged-usr systems (revisited) Ansgar <ansgar@43-1.org> - 2023-06-13 22:30 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Ansgar <ansgar@43-1.org> - 2023-05-26 08:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Matthew Vernon <matthew@debian.org> - 2023-05-26 09:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Ansgar <ansgar@43-1.org> - 2023-05-26 10:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-26 10:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Matthew Vernon <matthew@debian.org> - 2023-05-26 11:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-07 14:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-07 16:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-07 23:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-08 03:30 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-08 11:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-08 23:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-05-09 03:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Sam Hartman <hartmans@debian.org> - 2023-05-08 21:10 +0200
                booststrapping /usr-merged systems (was: Re: DEP 17: Improve support  for directory aliasing in dpkg) Helmut Grohne <helmut@subdivi.de> - 2023-05-17 11:40 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) "G. Branden Robinson" <g.branden.robinson@gmail.com> - 2023-05-17 11:50 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Marco d'Itri <md@Linux.IT> - 2023-05-17 12:20 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Luca Boccassi <bluca@debian.org> - 2023-05-17 12:30 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Sam Hartman <hartmans@debian.org> - 2023-05-17 19:20 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Simon Richter <sjr@debian.org> - 2023-05-18 08:40 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Luca Boccassi <bluca@debian.org> - 2023-05-18 11:30 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Simon Richter <sjr@debian.org> - 2023-05-19 02:40 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Luca Boccassi <bluca@debian.org> - 2023-05-19 13:10 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Sam Hartman <hartmans@debian.org> - 2023-05-17 19:30 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Raphael Hertzog <hertzog@debian.org> - 2023-06-08 10:50 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Luca Boccassi <bluca@debian.org> - 2023-06-08 12:10 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Marco d'Itri <md@Linux.IT> - 2023-06-09 09:50 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Raphael Hertzog <hertzog@debian.org> - 2023-06-09 12:00 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Luca Boccassi <bluca@debian.org> - 2023-06-09 12:40 +0200
                Re: booststrapping /usr-merged systems Bjørn Mork <bjorn@mork.no> - 2023-06-09 13:10 +0200
                Re: booststrapping /usr-merged systems Marco d'Itri <md@Linux.IT> - 2023-06-09 13:40 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve support for directory aliasing in dpkg) Johannes Schauer Marin Rodrigues <josch@debian.org> - 2023-06-09 17:40 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Helmut Grohne <helmut@subdivi.de> - 2023-06-09 15:30 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve support for directory aliasing in dpkg) Johannes Schauer Marin Rodrigues <josch@debian.org> - 2023-06-09 17:50 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Helmut Grohne <helmut@subdivi.de> - 2023-06-09 18:30 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) HW42 <hw42@ipsumj.de> - 2023-06-09 22:30 +0200
                Re: booststrapping /usr-merged systems (was: Re: DEP 17: Improve  support for directory aliasing in dpkg) Helmut Grohne <helmut@subdivi.de> - 2023-06-10 07:40 +0200
                Re: booststrapping /usr-merged systems Sven Joachim <svenjoac@gmx.de> - 2023-06-10 08:40 +0200
                Re: booststrapping /usr-merged systems Sven Joachim <svenjoac@gmx.de> - 2023-06-10 09:00 +0200
                Re: booststrapping /usr-merged systems Helmut Grohne <helmut@subdivi.de> - 2023-06-10 10:50 +0200
                Re: booststrapping /usr-merged systems Sven Joachim <svenjoac@gmx.de> - 2023-06-10 19:30 +0200
                Re: booststrapping /usr-merged systems Luca Boccassi <bluca@debian.org> - 2023-06-10 21:00 +0200
                Re: booststrapping /usr-merged systems Timo Röhling <roehling@debian.org> - 2023-06-11 23:20 +0200
                Re: booststrapping /usr-merged systems Luca Boccassi <bluca@debian.org> - 2023-06-27 21:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg David Kalnischkies <david@kalnischkies.de> - 2023-05-03 15:10 +0200
            Re: DEP 17: Improve support for directory aliasing in dpkg Bastien ROUCARIES <roucaries.bastien@gmail.com> - 2023-04-26 16:50 +0200
            Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-27 00:50 +0200
              Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-04-27 08:00 +0200
              Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-28 10:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-04-28 11:40 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Timo Röhling <roehling@debian.org> - 2023-04-28 12:00 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Luca Boccassi <bluca@debian.org> - 2023-04-29 02:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Sam Hartman <hartmans@debian.org> - 2023-05-02 17:40 +0200
              Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-04-28 14:10 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-28 15:50 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Marvin Renich <mrvn@renich.org> - 2023-04-29 20:20 +0200
                Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-29 22:20 +0200
              Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-28 22:20 +0200
      Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-02 15:00 +0200
        Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-02 15:10 +0200
        Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-05-02 16:00 +0200
    Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-22 13:00 +0200
  Re: DEP 17: Improve support for directory aliasing in dpkg Raphael Hertzog <hertzog@debian.org> - 2023-04-21 15:10 +0200
    Re: DEP 17: Improve support for directory aliasing in dpkg Simon Richter <sjr@debian.org> - 2023-04-21 19:30 +0200
    Re: DEP 17: Improve support for directory aliasing in dpkg Helmut Grohne <helmut@subdivi.de> - 2023-04-22 13:00 +0200
      Re: DEP 17: Improve support for directory aliasing in dpkg Simon McVittie <smcv@debian.org> - 2023-04-22 15:50 +0200
      Re: DEP 17: Improve support for directory aliasing in dpkg Raphael Hertzog <hertzog@debian.org> - 2023-04-24 11:40 +0200

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