Oier Bravo Urtasun
d8aefe95c4
Auto-detects the LAN interface from HOST_LAN_IP, sets allow-interfaces in /etc/avahi/avahi-daemon.conf (idempotent, backs up), restarts avahi. Self-sudos. Fixes the multi-bridge 'Local name collision' that blocks the mDNS path. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
49 lines
2.0 KiB
Bash
Executable File
49 lines
2.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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# mdns-host-setup.sh — pin the HOST avahi-daemon to the LAN interface so it
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# stops self-colliding across docker bridges ("Local name collision"), which
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# is what blocks the mDNS (.local) path on a host with many interfaces.
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#
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# Detects the LAN NIC from HOST_LAN_IP (.env), sets allow-interfaces=<nic> in
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# /etc/avahi/avahi-daemon.conf (idempotent, backs up first), restarts avahi.
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# Re-execs itself with sudo if not root. Run: tooling/mdns-host-setup.sh
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set -euo pipefail
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cd "$(dirname "$0")/.."
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[ -f .env ] && { set -a; . ./.env; set +a; }
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: "${HOST_LAN_IP:?HOST_LAN_IP unset (set in .env)}"
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nic="$(ip -o -4 addr show | awk -v ip="$HOST_LAN_IP" 'index($0, " "ip"/"){print $2; exit}')"
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[ -n "$nic" ] || { echo "ERROR: no interface found with IP $HOST_LAN_IP" >&2; exit 1; }
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echo "LAN interface for ${HOST_LAN_IP}: ${nic}"
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conf=/etc/avahi/avahi-daemon.conf
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[ -f "$conf" ] || { echo "ERROR: $conf not found — is avahi-daemon installed?" >&2; exit 1; }
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# Need root to edit the conf + restart the service.
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if [ "$(id -u)" -ne 0 ]; then
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echo "escalating with sudo…"
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exec sudo "$0" "$@"
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fi
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# Already pinned to this NIC? nothing to do.
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if grep -qE "^allow-interfaces=${nic}([,[:space:]]|$)" "$conf"; then
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echo "already set: allow-interfaces=${nic}"
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else
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cp -a "$conf" "${conf}.bak.$(date +%s)"
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if grep -qE '^allow-interfaces=' "$conf"; then
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sed -i -E "s/^allow-interfaces=.*/allow-interfaces=${nic}/" "$conf"
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elif grep -qE '^#\s*allow-interfaces=' "$conf"; then
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sed -i -E "s/^#\s*allow-interfaces=.*/allow-interfaces=${nic}/" "$conf"
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else
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# insert right after the [server] section header
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sed -i -E "/^\[server\]/a allow-interfaces=${nic}" "$conf"
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fi
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echo "set allow-interfaces=${nic} (backup: ${conf}.bak.*)"
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fi
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echo "restarting avahi-daemon…"
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systemctl restart avahi-daemon
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sleep 1
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systemctl is-active --quiet avahi-daemon && echo "avahi-daemon active" || { echo "ERROR: avahi-daemon not active" >&2; exit 1; }
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grep -E '^allow-interfaces=' "$conf"
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