Lennart Poettering
f9cfc019f9
When writing a raw image into a section of an existing file or block device (i.e. with --offset= and --size-max=, as sysupdate does when updating a partition), we so far wrote precisely as many bytes as the payload was large, leaving whatever followed in the destination range untouched. For some payloads that's a problem: a verity signature partition for example must carry NUL bytes only after the JSON object, and if a shorter signature is written over a longer one, the tail of the old one survives. Add a --zero-fill= boolean switch to both "systemd-import raw" and "systemd-pull raw", which fills up the remainder of the destination range (from the end of the payload up to --size-max=) with zeroes once the payload has been written, via blockdev_zero_out(). It defaults to off, and requires both --offset= and --size-max= to be specified. (cherry picked from commit aff5aff407d421fbedc9eb0229c40996ca5570a1)
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