Ed Santiago 9e3363c5e3 CI: systest: safer random_rfc1918_subnet ...

Our aarch64 CI system uses 172.31.0.0/20. Because I was (and am)
lazy, my random_rfc1918_subnet() helper was only checking /24.
This causes flakes.

Solution is to actually do it right: binary arithmetic, prefix
matching. This is effectively impossible in bash, so, use a
hairy perl helper and add copious tests.

Fixes: #18693

Signed-off-by: Ed Santiago <santiago@redhat.com>

2023-10-26 09:19:32 -06:00

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