57ada07e7a
When enumerating what versions exist for a given target, sysupdate would completely throw out any version that's incomplete (where some of the transfers in the target have that version installed or available, and other transfers do not). If we're trying to find what versions we can offer for download, this is great behavior. If the server side is advertising a partial update to download, we shouldn't present it to the user. On the other hand, if we're enumerating what versions we have currently installed, this is a bad behavior. It makes sysupdate fragile. For example, if a sysext introduces a new .conf file into /usr/lib/sysupdate.d, suddenly the currently-installed OS stops being a version that we've enumerated. Since it's not enumerated, it's not protected, and so sysupdate will wipe the booted OS. So if we're looking for installed versions, we now loosen the restrictions and enumerate incomplete installations. Partial fix for https://github.com/systemd/systemd/issues/33339
System and Service Manager
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