декларативное распределение пользователей и групп системы (Declarative allocation of system users and groups)
Конфигурационные каталоги и предшественники (Configuration directories and precedence)
Each configuration file shall be named in the style of
package.conf or package-part.conf. The second variant should be
used when it is desirable to make it easy to override just this
part of configuration.
Files in /etc/sysusers.d override files with the same name in
/usr/lib/sysusers.d and /run/sysusers.d. Files in /run/sysusers.d
override files with the same name in /usr/lib/sysusers.d.
Packages should install their configuration files in
/usr/lib/sysusers.d. Files in /etc/sysusers.d are reserved for
the local administrator, who may use this logic to override the
configuration files installed by vendor packages. All
configuration files are sorted by their filename in lexicographic
order, regardless of which of the directories they reside in. If
multiple files specify the same path, the entry in the file with
the lexicographically earliest name will be applied. All later
entries for the same user and group names will be logged as
warnings.
If the administrator wants to disable a configuration file
supplied by the vendor, the recommended way is to place a symlink
to /dev/null in /etc/sysusers.d/ bearing the same filename.
