On 2016-03-30 16:13:44 +0300 (+0300), Riku Voipio wrote: [...] > Is there a specific usecase for using tar as input, or is > it to make image building faster? [...] At least one benefit: it's a convenient hack as a penultimate step to ensure that blocks for the resulting image are composed as contiguously as possible. Contiguousness has a significant impact on compression (such as for qcow2 format). -- Jeremy Stanley