The loading of an extension image from a symlink "NAME.raw" to "NAME-VERSION.raw" failed because the release file name check worked with the backing file of the loop device which already resolves the symlink and thus the found name "NAME-VERSION" mismatched "NAME". Pass the original filename and use it instead of the backing file when available. This fixes the loading of "NAME.raw" extensions which are a symlink to "NAME-VERSION.raw" as, e.g., may be the case when systemd-sysupdate manages multiple versions. Fixes https://github.com/systemd/systemd/issues/24293
System and Service Manager
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