On Thu, 2020-03-12 at 21:45 +0000, Rainer Weikusat via Dng wrote: > - the sole purpose of this text is for the amusement of people who > ever > had to find a (preferably simple) solution for a complicated problem > - > > Problem I had to deal with since yesterday: Some Debian 10 system (use > of systemd mandated) installation I've created was to be captured by a > certain image capturing tool running on Windows. As it turned out to > be, > this capturing tool has no support for Linux swap partitions and thus, > tries to capture them by doing a sector-by-sectory copy of random junk > which won't ever be of any use again. > > Proposed solution: Turn that into an ext4 filesystem, record the UUID, > run a script at boot to convert it back to a swap partition. This > could > have been solved by suitable manipulation of /etc/rcS-symlinks but the > mere thought of something as unsophisticated at that would cause > systemd > developers to start spinning until the reach escape velocity, never to > be seen again - and who could possibly want that.
How about a simpler solution? On shutdown: 1. Capture the label and UUID of the swap partition. 2. Do a swapoff. 3. Zero out the swap partition. 4. Remake it with the same label and UUID. It will still get a sector by sector copy but assuming it is compressed it will be of trivial size.
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