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

[Michal Domonkos]

@dmnks commented on this pull request.



> +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
+fields passed as separate arguments and must be declared in the (sub-)package
+context. This method is primarily intended for platforms without systemd where
+it is typically also coupled with a custom *%\_\_systemd_sysusers* binary (see
+*DECODING* for details).

Put more simply, we could write the text in two ways:
1. Describe the systemd integration as the "default" method, and mention the non-systemd use cases separately (in a dedicated section)
2. Describe the declarative functionality itself, and just mention that it integrates natively with systemd platforms (i.e. the current version of the text, more or less)

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