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fix(smoke): capture arp-scan output instead of piping into awk #8

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daniel merged 1 commit from fix-smoke-pipefail into main 2026-04-18 15:43:50 +02:00
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1 changed files with 9 additions and 4 deletions
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13
scripts/smoke-vm.sh
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@ -153,14 +153,19 @@ MAC_LOWER="$(echo "$MAC" | tr 'A-Z' 'a-z')"
IP=""
deadline=$((SECONDS + 150))
while (( SECONDS < deadline )); do
# Capture-then-parse instead of piping directly into awk. `awk '... exit'`
# exits on first match, which SIGPIPEs the upstream arp-scan (exit 141).
# With `set -o pipefail` active that kills the whole script — exactly what
# happened the first time host-networking gave arp-scan real matches.
SCAN=""
if command -v arp-scan >/dev/null 2>&1; then
IP="$(sudo arp-scan --localnet --quiet --ignoredups 2>/dev/null \
| awk -v m="$MAC_LOWER" 'tolower($2) == m { print $1; exit }')"
SCAN="$(sudo arp-scan --localnet --quiet --ignoredups 2>/dev/null || true)"
IP="$(awk -v m="$MAC_LOWER" 'tolower($2) == m { print $1; exit }' <<<"$SCAN")"
fi
if [[ -z "$IP" ]] && command -v nmap >/dev/null 2>&1; then
sudo nmap -sn -T4 192.168.178.0/24 >/dev/null 2>&1 || true
IP="$(ip neigh show \
| awk -v m="$MAC_LOWER" 'tolower($5) == m && $1 ~ /^[0-9]/ { print $1; exit }')"
NEIGH="$(ip neigh show)"
IP="$(awk -v m="$MAC_LOWER" 'tolower($5) == m && $1 ~ /^[0-9]/ { print $1; exit }' <<<"$NEIGH")"
fi
[[ -n "$IP" ]] && break
sleep 5