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Fix QEMU hanging when boot.sh --test output is piped #378

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Merged
jserv merged 1 commit into from
May 19, 2026
Merged

Fix QEMU hanging when boot.sh --test output is piped #378

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11 changes: 10 additions & 1 deletion devtools/boot.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -86,4 +86,13 @@ fi
# Append any extra user-provided QEMU args
QEMU_ARGS+=("${EXTRA_QEMU_ARGS[@]+"${EXTRA_QEMU_ARGS[@]}"}")

exec "$QEMU_BIN" "${QEMU_ARGS[@]}"
# In test mode the guest never reads stdin. Redirect from /dev/null so
# QEMU's -nographic serial setup never calls tcsetattr() on a real
# terminal, which would receive SIGTTOU if the caller piped stdout or
# wrapped boot.sh with timeout(1) (whose child runs in its own process
# group, not the terminal's foreground group).
if [ -n "$TEST_CMD" ]; then
exec "$QEMU_BIN" "${QEMU_ARGS[@]}" < /dev/null
else
exec "$QEMU_BIN" "${QEMU_ARGS[@]}"
fi