[q66]

this is misleading, apk transactions are only atomic if no pre/post-install/deinstall/upgrade hooks run, as every invocation of a hook requires a commit of everything done until that point

they are not atomic in alpine, i highly doubt they are atomic in adelie, they are almost atomic in chimera, though there is still a couple places left that break that and i'm working on them (some of it also requires apk 3.x features and is not possible with legacy apk which both alpine and adelie are using)