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ephemeral: Preserve stdin for an interactive console #387

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Merged
cgwalters merged 1 commit into from
Sep 29, 2026
Merged

ephemeral: Preserve stdin for an interactive console #387

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4 changes: 3 additions & 1 deletion crates/kit/scripts/entrypoint.sh
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Expand Up @@ -67,7 +67,9 @@ trap 'kill -TERM $BWRAP_PID 2>/dev/null; exit 0' INT TERM
# Run bwrap in background so we can handle signals; xref
# https://github.com/containers/bubblewrap/pull/586
# But probably really we should switch to systemd
bwrap --as-pid-1 --unshare-pid "${BWRAP_ARGS[@]}" --bind /run /run -- ${SELFEXE} container-entrypoint "$@" &
# Bash normally gives a background command /dev/null on stdin, so
# keep stdin attached so QEMU can receive input.
bwrap --as-pid-1 --unshare-pid "${BWRAP_ARGS[@]}" --bind /run /run -- ${SELFEXE} container-entrypoint "$@" <&0 &
BWRAP_PID=$!

# Wait for bwrap to complete
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3 changes: 2 additions & 1 deletion docs/src/man/bcvk-ephemeral-run.md
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Expand Up @@ -67,6 +67,7 @@ This design allows bcvk to provide VM-like isolation and boot behavior while lev
**--console**

Connect the QEMU console to the container's stdio (visible via podman logs/attach)
Add **-i -t** to send keyboard input to the guest console.

**--debug**

Expand Down Expand Up @@ -216,7 +217,7 @@ run and SSH into one command with automatic cleanup.

**Debugging boot issues**:

bcvk ephemeral run --console --name debugvm localhost/mybootc
bcvk ephemeral run --console -it --name debugvm localhost/mybootc

## Understanding the Flags

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