executor: mount read-only sysfs inside isolated actions - #42
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Hardware-topology discovery inside actiond currently fails with: ```text hwloc/linux: failed to find sysfs cpu topology directory, aborting linux discovery. ``` Create an action-local `/sys` mount point and mount sysfs read-only after entering the existing private mount namespace. Keep the mount `nosuid`, `nodev`, and `noexec`, and extend the existing chroot-directory test. The ARM64 guest was rebuilt through actiond. A real remote action reads `/sys/devices/system/cpu/online` and verifies the sysfs mount is read-only; the original mpi4py integration no longer reports the hwloc topology error and advances to its separate libfabric initialization issue.
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Hardware-topology discovery inside actiond currently fails with:
Create an action-local
/sysmount point and mount sysfs read-only afterentering the existing private mount namespace. Keep the mount
nosuid,nodev, andnoexec, and extend the existing chroot-directory test.The ARM64 guest was rebuilt through actiond. A real remote action reads
/sys/devices/system/cpu/onlineand verifies the sysfs mount is read-only;the original mpi4py integration no longer reports the hwloc topology error
and advances to its separate libfabric initialization issue.