pv-runtime: Reset STEAM_ZENITY
If it's explicitly set to the empty string, this indicates that programs
should not be using zenity; carry that through to the container runtime.
Otherwise, set or unset it according to whether it exists inside the
container runtime. In practice, all of our runtimes do have it.
steamrt/tasks#397
Signed-off-by:
Simon McVittie <smcv@collabora.com>
parent
95a45b0b
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