[Octave-bug-tracker] [bug #63803] Saving causes OOM, crash, and loss of already saved data

[Arun Giridhar]

Follow-up Comment #15, bug #63803 (project octave):

I pushed a change https://hg.savannah.gnu.org/hgweb/octave/rev/354ed032ba50 to
write to a temp file first and then rename it to the desired filename. This
works for me exactly as intended, and it doesn't use extra disk space. I've
only used standard C++ functions, but it needs testing from CI for
cross-platform behavior.

Please stress test this function if you can. It needs to be reliable so that
saving data is robust.

Example test: save a large amount of data to a file test.mat, then save more
variables to the same file, but while it is writing it, kill the Octave
process (e.g. `kill -9 octave`). Then restart Octave and load test.mat -- it
should be intact and all the data should be as it was with the last successful
save.


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