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The current naming pattern for transient scope units does not yield a natural way to create systemd drop-in configurations that apply to all instances of a snap, regardless of the UUID. For example, systemd drop-in configurations for a unit named foo-bar-baz.scope could be made by placing .conf snippets in any of the following directories: /etc/systemd/user/foo-bar-baz.scope.d/ /etc/systemd/user/foo-bar-.scope.d/ /etc/systemd/user/foo-.scope.d/ In other words, successively truncating the unit name after '-' yields valid drop-in directory names. This feature is specifc to '-', and in particular does not work with '.'. It is desirable to have the ability to write drop-in configurations that apply, for example, to all instances of firefox. To allow this functionality, modify the pattern used for transient scope units to snap.<pkg>.<app>-<uuid>.scope (i.e. separate the app name and UUID by a '-'). Both the old and the new patterns are supported in an attempt to make a smooth transition. Signed-off-by: Nick Rosbrook <nick.rosbrook@canonical.com>