Re: [PATCH] gnu: fontconfig: Add replacement with font-dejavu instead of gs-fonts.

[zimoun <zimon.toutoune@gmail.com>]

On Wed, 20 May 2020 at 15:55, Marius Bakke <mbakke@fastmail.com> wrote:
> zimoun <zimon.toutoune@gmail.com> writes:

> > Apparently, there is different fonts on master and core-updates, if yes why?
>
> The only known difference since the core-updates merge is that
> applications using Pango (e.g. GTK+) no longer recognizes bitmap fonts.
>
>   https://gitlab.gnome.org/GNOME/pango/issues/386

Thank you for the pointer but I think it is another issue.


> > I mean, on my machine -- Guix on the top of Debian with font-dejavu
> > installed -- why does commit 4bdf4182fe (core-update merge) not
> > display correctly and the parent commit c81457a588 too but the other
> > parent commit 23a59b180b displays nicely?
>
> Leo reported problems with fonts on Debian in
> <https://issues.guix.gnu.org/issue/41132>, but said that fonts installed
> with Guix still worked.  I don't know what could cause it to fail on
> your system.

Thank for the pointer, it seems the same issue.  But I am not sure
because I am using the font from Guix.

Well, I have font-dejavu-2.37 and fontconfig-2.13.1 installed in
~/.guix-profile from Guix e98689f.


When I run

    guix pull --commit=4bdf4182fe -p /tmp/bad

then

   display  /tmp/bad/share/info/images/bootstrap-graph.png

there is an issue.  Note that 'imagemagick' is installed in
~/.guix-profile using the same commit above.


The commit 4bdf4182fe is the commit of merge.  If I pull from the
(left) parent commit, i.e., the commit c81457a588,

  guix pull --commit=c81457a588 -p /tmp/left

then

  display  /tmp/right/share/info/images/bootstrap-graph.png

displays nicely and the font is correct.  However, if I pull form the
(right) parent commit, i.e., the commit 23a59b180b,

  guix pull --commit=23a59b180b -p /tmp/right

then

  display  /tmp/right/share/info/images/bootstrap-graph.png

displays wrongly.  Well, I have changed nothing, considering the
fonts.  And the only difference is commit from "master" vs from
"core-updates".  And as I explained [1], it always happens when
core-updates is merged.


BTW, let checkout 4bdf4182fe (git worktree add -b) and run ./bootstrap
&& ./configure --localstatedir=/var/ && make -j4 in "guix environment
--pure guix".  Then the image doc/images/bootstrap-graph.png displays
nicely.  Idem for the two other commits.  It is the same when building
using the -C option.

However, if I pull from this fresh Guix using,

    ./pre-env-inst guix pull --branch=merge --url=$PWD -p /tmp/merge

then outside the environment, using the very same imagemagick,

   display  /tmp/merge/share/info/images/bootstrap-graph.png

displays wrongly.  Same for the (right) commit 23a59b180b.  But it is
not the case for the left commit c81457a588.  And as I noted [1] this
happens with all the merges of core-updates.


Something is different between 23a59b180b and c81457a588 in regard to
the font, otherwise the exact same procedure would end to the same
result using the same machine.  The question is: does someone
reproduce the same behaviour on Guix System? on other than Debian
foreign distro?


[1] http://issues.guix.gnu.org/issue/41282

All the best,
simon