The custom help() is replaced by a COMMAND() description, and --introspect-cli is added. Options are now in two groups: "Common options" and Mount options". In --help, for systemd-mount, both groups are shown. For systemd-umount, only the first. This changes the behaviour a bit: previously, both groups were shown together as one list. I think the new behaviour is actually a bit better, because it makes it easier for the user to figure out that the commands share common options and one of the commands has its private second group. But if people think that the previous behaviour should be restored, we could add a display options to squish the groups back together. --help now goes through the pager, like other commands with --no-pager.
System and Service Manager
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