14b1a92eb2
unit_name_mangle_with_suffix() is quite benevolent by default and allows the unit to "transition" into a different unit type than what's requested via its suffix argument. For example, calling unit_name_mangle_with_suffix() with "/foo/bar" as a unit name and ".service" as a suffix would give you "foo-bar.mount", without any warning or error. This could then lead to a quite confusing errors in certain situations: ~# systemd-run --remain-after-exit --unit /foo/bar true Failed to start transient service unit: Cannot set property RemainAfterExit, or unknown property. Given we can't change the default behaviour of unit_name_mangle_with_suffix() as some parts of systemd already depend on its "benevolence" (like systemctl), let's introduce a new flag - UNIT_NAME_MANGLE_STRICT - that checks if the mangled/resolved unit name's suffix matches the requested one and errors out if not. With the flag used throughout systemd-run's code, the error in the above case is now a bit more clear: ~# build/systemd-run --remain-after-exit --unit /foo/bar true Path "/foo/bar" resolves to unit type "mount", but "service" is expected as unit. Failed to mangle unit name: Invalid argument Resolves: #39996
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