convert: gsfonts are missing after 8:6.9.10.23+dfsg-2.1ubuntu11.6

[Greg Whiteley]

Background
----------

Our builds have started failing generating images with imagemagick as of around 2023-03-22 TZ +1100

All issues seen on 20.04 - definitely failing with version 8:6.9.10.23+dfsg-2.1ubuntu11.6

Package version details below

Issue
-----

This generation command was working in clean-room 20.04 builds up to this point in time

convert -background black -fill white -size 50x50 -gravity Center -font "fixed" -pointsize 48 label:01 text_01.png

Now it fails with

$ convert -background black -fill white -size 50x50 -gravity Center -font "fixed" -pointsize 48 label:01 text_01.png
convert-im6.q16: unable to read font `fixed' @ error/annotate.c/RenderFreetype/1338.
convert-im6.q16: no images defined `text_01.png' @ error/convert.c/ConvertImageCommand/3258.

Investigation
-------------

Issue occurs on version "8:6.9.10.23+dfsg-2.1ubuntu11.6"

apt is refusing to install the ".4" (probably last known good) or ".5" versions - saying they are unavailable. I've reverted back to version "8:6.9.10.23+dfsg-2.1ubuntu11" for the comparison.

I can see the difference with "convert -list font"

In 1ubuntu11 (works) I see "fixed" in the list

  Font: fixed
    family: Helvetica
    style: Normal
    stretch: Normal
    weight: 400
    glyphs: /usr/share/fonts/type1/gsfonts/n019003l.pfb

in 1ubuntu11.6 it is not present.

Using the command "convert -list font" under strace I see that ghostscript fonts are no longer being parsed. The outputs are identical until:

In 1ubuntu11 (works) I see:

...
916982 stat("/etc/ImageMagick-6/type-ghostscript.xml", {st_mode=S_IFREG|0644, st_size=9680, ...}) = 0
916982 openat(AT_FDCWD, "/etc/ImageMagick-6/type-ghostscript.xml", O_RDONLY) = 3
916982 lseek(3, 0, SEEK_END) = 9680
916982 mmap(NULL, 9680, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fd089fa0000
916982 munmap(0x7fd089fa0000, 9680) = 0
916982 close(3) = 0
916982 stat("/usr/share/fonts/type1/gsfonts/a010013l.afm", {st_mode=S_IFREG|0644, st_size=43100, ...}) = 0
916982 access("/usr/share/fonts/type1/gsfonts/a010013l.afm", F_OK) = 0
916982 stat("/usr/share/fonts/type1/gsfonts/a010013l.pfb", {st_mode=S_IFREG|0644, st_size=63673, ...}) = 0
916982 access("/usr/share/fonts/type1/gsfonts/a010013l.pfb", F_OK) = 0
....
916982 stat("/usr/share/fonts/type1/gsfonts/s050000l.pfb", {st_mode=S_IFREG|0644, st_size=33709, ...}) = 0
916982 access("/usr/share/fonts/type1/gsfonts/s050000l.pfb", F_OK) = 0
916982 access("/etc/fonts/fonts.conf", R_OK) = 0
...

In 1ubuntu11.6 I see at the same point - then the output continuing the same as 1ubuntu11 after:

...
917636 openat(AT_FDCWD, "/usr/share/ImageMagick-6/locale.xml", O_RDONLY) = 3
917636 lseek(3, 0, SEEK_END) = 2461
917636 mmap(NULL, 2461, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f040d877000
917636 munmap(0x7f040d877000, 2461) = 0
917636 close(3) = 0
917636 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/ImageMagick-6.9.10//config-Q16/locale.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/etc/ImageMagick-6/locale.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/usr/share/doc/imagemagick-6-common/htmllocale.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/home/user/.config/ImageMagick/locale.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/home/user/.magick/locale.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/usr/share/ImageMagick-6/english.xml", O_RDONLY) = 3
917636 lseek(3, 0, SEEK_END) = 49236
917636 mmap(NULL, 49236, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f040d86b000
917636 munmap(0x7f040d86b000, 49236) = 0
917636 close(3) = 0
917636 openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/ImageMagick-6.9.10//config-Q16/english.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/etc/ImageMagick-6/english.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/usr/share/doc/imagemagick-6-common/htmlenglish.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/home/user/.config/ImageMagick/english.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 openat(AT_FDCWD, "/home/user/.magick/english.xml", O_RDONLY) = -1 ENOENT (No such file or directory)
917636 brk(0x5612eb166000) = 0x5612eb166000
917636 access("/etc/fonts/fonts.conf", R_OK) = 0
...

Has someone changed the --configure line?

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: imagemagick-6.q16 8:6.9.10.23+dfsg-2.1ubuntu11.6
ProcVersionSignature: Ubuntu 5.15.0-67.74~20.04.1-generic 5.15.85
Uname: Linux 5.15.0-67-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Fri Mar 24 11:19:19 2023
InstallationDate: Installed on 2021-04-12 (710 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
SourcePackage: imagemagick
UpgradeStatus: No upgrade log present (probably fresh install)

[David Zuelke (dzuelke)]

This is because `/etc/` is now prohibited in the default policy file. I don't know why that change was made as part of https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/2004580, it's definitely wrong.

[David Zuelke (dzuelke)]

Corrected patches that fix this regression are attached to https://bugs.launchpad.net/ubuntu/+source/imagemagick/+bug/2004580

[David Zuelke (dzuelke)]

This affects jammy and kinetic, as well.

[Greg Whiteley (greg-whiteley)]

I only referred to focal because I understand that gsfonts was removed/reworked upstream in debian and doesn't exist in jammy (at least not in the same form). I didn't want to assume a problem larger than the one I had seen.