In NixOS, /etc is NOT read-only, and most things in /etc are symlinks
to /etc/static, which is a symlink into the nix store - so the upstream
systemd "/etc is read-only" detection doesn't work.
Fixes#224080.
systemd v253 changelog/NEWS:
https://github.com/systemd/systemd/blob/v253/NEWS
NixOS changes:
0007-hostnamed-localed-timedated-disable-methods-that-cha.patch was
dropped, because systemd gained support to handle read-only /etc.
*-add-rootprefix-to-lookup-dir-paths.patch required some updates too,
as src/basic/def.h moved to src/basic/constants.h.
systemd/systemd#25771 switched p11kit to become
dlopen()'ed, so we need to patch that path.
added a note to the 23.05 release notes to recommend `nixos-rebuild boot`
Co-authored-by: Florian Klink <flokli@flokli.de>
The ConditionFileNotEmpty override patch wasn't correct for stage1, which
does have the modules in /lib. So, remove the patch and set
the right path with overrides in the final system.
Also, make sure systemd-tmpfiles-setup-dev is pulled in to create
all the necessary symlinks.
