image,manifest: allow using the qcow2 pipeline without a build pipeline (HMS-3318) #376
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This commit allows to use the qcow2 pipeline outside of a build pipeline. The use-case is the
bootc-image-builder
that will use arbitrary containers as buildroots and we cannot assume that they haveqemu-util
installed. And becausebootc-image-builder
is already a container we can installqemu-util
there and be confident that it will work.Note that there is one small drive-by one-ine improvement in one of the panics()s. I had a bit of trouble writing the test and this helped me to pinpoint what is missing. Happy to remove it again (as it's not needed for the PR itself).