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Stop Steam-in-Snap from breaking TMPDIR

Simon McVittie requested to merge wip/smcv/snap-tmp into main

  • pv-wrap: Try to share TMPDIR, etc. with the container

    We share /tmp with the container, so it's consistent if we also share $TMPDIR and so on.

  • pv-wrap: Don't share temp directory below $XDG_RUNTIME_DIR

    Snap sets TMPDIR=$XDG_RUNTIME_DIR/snap.steam, but its AppArmor profile won't allow us to bind-mount that path into our container.

    Helps: https://github.com/ValveSoftware/steam-runtime/issues/586

/cc @denittis

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