Fix apparmor config.

[rumpeltux]

Related bugs:

• https://bugzilla.suse.com/show_bug.cgi?id=1111906
• https://bugs.debian.org/988068
• https://github.com/jonls/redshift/issues/672
• https://github.com/jonls/redshift/pull/860

src/config-ini.c still looks for $HOME/.config/redshift.conf which fails to open because the apparmor profile doesn’t allow it.

src/config-ini.c also does this:

   struct passwd *pwd = getpwuid(getuid());
   char *home = pwd->pw_dir;

Since getpwuid doesn’t have access to /etc/passwd* it returns NULL, causing a segmentation fault in the line thereafter. This code is not triggered if a config is specified (e.g. -c redshift.conf) or $HOME/.config/redshift.conf exists.

[CameronNemo]

I will remind everyone at Debian that Gammastep is a fork of Redshift that is maintained and accepting pull requests. It still supports all of the FOSS backends that Redshift supports (only Windows and macOS support were removed, not X or DRM; Wayland support was added).

You may also find this fix, that has been included in gammastep for over 2 years, helpful:

https://gitlab.com/chinstrap/gammastep/-/commit/9db19f5ccfad20ab7b501daedcfd5ef137860dd2

Gammastep in Debian could use an update, from 2.0.2 to 2.0.9. There have been some relevant fixes since the last version was uploaded to Sid. https://gitlab.com/chinstrap/gammastep/-/blob/master/NEWS.md