[1.4] runtime-spec: update pids.limit handling to match new guidance #5004
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The main update is actually in github.com/opencontainers/cgroups, but we need to also update runtime-spec to a newer pre-release version to get the updates from there as well. In short, the behaviour change is now that "0" is treated as a valid value to set in "pids.max", "-1" means "max" and unset/nil means "do nothing". As described in the opencontainers/cgroups PR, this change is actually backwards compatible because our internal state.json stores PidsLimit, and that entry is marked as "omitempty". So, an old runc would omit PidsLimit=0 in state.json, and this will be parsed by a new runc as being "nil" -- and both would treat this case as "do not set anything". Signed-off-by: Aleksa Sarai <[email protected]> (cherry picked from commit 3b75374) Signed-off-by: Aleksa Sarai <[email protected]>
Signed-off-by: Aleksa Sarai <[email protected]> (cherry picked from commit 72421e0) Signed-off-by: Aleksa Sarai <[email protected]>
This is much easier to read and removes the need for explicit per-type helper functions. Signed-off-by: Aleksa Sarai <[email protected]> (cherry picked from commit 8ab2458) Signed-off-by: Aleksa Sarai <[email protected]>
cyphar
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kolyshkin
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Nov 12, 2025
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Backport of #4949.
The main update is actually in github.com/opencontainers/cgroups, but we
need to also update runtime-spec to a newer pre-release version to get
the updates from there as well.
In short, the behaviour change is now that "0" is treated as a valid
value to set in "pids.max", "-1" means "max" and unset/nil means "do
nothing". As described in the opencontainers/cgroups PR, this change is
actually backwards compatible because our internal state.json stores
PidsLimit, and that entry is marked as "omitempty". So, an old runc
would omit PidsLimit=0 in state.json, and this will be parsed by a new
runc as being "nil" -- and both would treat this case as "do not set
anything".
Fixes #4014
Closes #4015
Closes #4023
Signed-off-by: Aleksa Sarai [email protected]