mkosi initrd fails on stale pacman sockets

[keszybz]

$ rpm -q mkosi mkosi-initrd              
mkosi-22-1.fc40.noarch
mkosi-initrd-22-1.fc40.noarch
$ sudo kernel-install -v add 6.8.1-300.fc40.x86_64 /lib/modules/6.8.1-300.fc40.x86_64/vmlinuz
..
Successfully forked off '(direxec)' as PID 12339.
cp: cannot open '/etc/pacman.d/gnupg/S.gpg-agent' for reading: No such device or address
cp: cannot open '/etc/pacman.d/gnupg/S.gpg-agent.extra' for reading: No such device or address
cp: cannot open '/etc/pacman.d/gnupg/S.gpg-agent.browser' for reading: No such device or address
cp: cannot open '/etc/pacman.d/gnupg/S.gpg-agent.ssh' for reading: No such device or address
‣ "cp --recursive --dereference --preserve=mode,links,timestamps,ownership,xattr --reflink=auto --copy-contents /etc/pacman.d /tmp/tmp4t5oozng/etc/pacman.d --no-target-directory" returned non-zero exit code 1.
/usr/lib/kernel/install.d/50-mkosi.install failed with exit status 1.
/usr/lib/kernel/install.d/50-mkosi.install failed with exit status 1.
(sd-exec-strv) failed with exit status 1.
$ ls -l /etc/pacman.d/gnupg/S.gpg-agent                                         
srwx------ 1 root root 0 Jan 22 10:58 /etc/pacman.d/gnupg/S.gpg-agent
$ file /etc/pacman.d/gnupg/S.gpg-agent                                  
/etc/pacman.d/gnupg/S.gpg-agent: socket

I don't know what created that socket there… But probably, anything that is not a file or directory should not be copied.