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Just in case the build.log will be inobvious, and it's easy to diagnose automatically. Thanks Andrey Stroganov for this use case. Thanks for improving the initial implementation go to raorn@ for kind commit lynch and to Yuri Bushmelev for actually suggesting something more concise. BTW the "1024" magic number was taken out of thin air: the "no free space" errors are most likely to happen while forming/populating a chroot (apt/rpm errors out) and chroots are roughly two orders of magnitude heftier than a megabyte.