New record <setuid-program> with fields for setting the specific user
and group, as well as specifically selecting the setuid and setgid bits,
for a program within the setuid-program-service.
* gnu/services.scm (setuid-program-file-like-deprecated): New function.
(setuid-program-service-type): Make use of
setuid-program->activation-gexp. Adjust the extend property to handle
<setuid-program>.
* gnu/build/activation.scm (activate-setuid-programs): Update to expect a
<setuid-record> list for each program entry.
* gnu/system.scm: (operating-system-setuid-programs): Renamed to
%operating-system-setuid-programs and replace it with new procedure.
(operating-system-default-essential-services,
hurd-default-essential-services): Replace
operating-system-setuid-programs with
%operating-system-setuid-programs.
* gnu/system/setuid.scm: New file.
* doc/guix.texi (Setuid Programs): Document <setuid-program>.
Co-authored-by: Brice Waegeneire <brice@waegenei.re>
a7ac19851b