[Rpm-maint] [rpm-software-management/rpm] Add a man page for rpm sysusers integration (PR #4126)

[Michal Domonkos]

@dmnks commented on this pull request.



> +# DESCRIPTION
+
+RPM has native support for the *sysusers.d*(5) format (introduced by systemd)
+that enables packages to declare users and/or groups to be automatically created
+at installation time. This eliminates the need for the manual creation of such
+accounts in transaction scriptlets.
+
+This works implicitly if a package ships one or more files in this format under
+*%\_sysusersdir* (typically _/usr/lib/sysusers.d/_). RPM will then automatically
+invoke the *%\_\_systemd_sysusers* binary (typically *systemd-sysusers*(8)) with
+the correct arguments in order to create the user and/or group accounts when the
+package is installed. This is the recommended method on systemd native platforms
+and requires no intervention from the package beyond shipping those files.
+
+RPM also allows for declaring sysusers.d entries explicitly in the spec file
+with the *%add_sysuser* macro. This macro takes a sysusers.d line with its

I contemplated this (yes, lol), too. We need to mention this reference in a lot of places, and using the "full" man page reference syntax seems a bit over the top. That's why I kinda settled on the simpler "sysusers.d" variant for later occurrences...

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