I initially didn't think it would be worth doing this, but I changed my mind. People out there quite successfully build systemd without ACL support, and that suggests life without it is quite possible. Moreover we only use it as very specific places: 1. in udev/logind for "uaccess" mgmt 2. in tmpfiles to implement explicitly configured acl changes 3. in journald/coredump/pstore to manage access to unpriv users 4. in pid1 to manage access to credential files 5. when shifting UIDs of container trees I specific container environments it should be entirely fine to live without all of these, hence let's pull this in on demand only.
System and Service Manager
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