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I'm not sure why this would be failing; my best guess is that your change to probe_cmd() is causing it to think it can't find sh on Travis. I can't reproduce it locally though. :/
* Add "privileged container" mode to `sandbox.c`
On some Linux kernels, mounting overlay filesystems within user
namespaces is broken, see [0] for an Ubuntu issue tracking this and
their patch to fix it. To work around this, we allow the user to enable
running the sandbox through `sudo`, which adds another path through the
already convoluted `sandbox.c`. After a thorough reorganization of
`sandbox.c`, we now have three well-defined execution modes (init,
unprivileged and privileged) and a `sandbox` that can either mount
overlay filesystems as root within a user namespace, or can mount
overlay filesystems as root outside of a user namespace, then enter the
user namespace.
[0] https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1531747
* Bump rootfs version
* Quash some small bugs
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Alternative fix for #127