add edgeos-hostname service using device UUID for mDNS #39
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1 @@ | ||
| enable edgeos-hostname.service |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,118 +1,136 @@ | ||
| #!/bin/bash | ||
| # | ||
| # EdgeOS Hostname Generation Script | ||
| # Generates a unique hostname based on device UUID (fallback to serial/MAC) | ||
| # | ||
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| set -Eeuo pipefail | ||
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| UUID_FILE="/etc/edgeos/device-uuid" | ||
| PREFIX="edgeos" | ||
| STATE_DIR="/etc/edgeos" | ||
| STATE_HOSTNAME_FILE="${STATE_DIR}/hostname" | ||
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| # Logging | ||
| log() { | ||
| echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" | ||
| logger -t edgeos-hostname "$*" || true | ||
| } | ||
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| # Validate UUID (accepts with/without dashes, case-insensitive) | ||
| is_valid_uuid() { | ||
| local v="${1,,}" | ||
| [[ "$v" =~ ^[0-9a-f]{8}-?[0-9a-f]{4}-?[0-9a-f]{4}-?[0-9a-f]{4}-?[0-9a-f]{12}$ ]] | ||
| } | ||
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| # Primary source: device UUID | ||
| get_device_uuid() { | ||
| local uuid="" | ||
| if [ -r "$UUID_FILE" ]; then | ||
| uuid="$(tr -d '[:space:]' < "$UUID_FILE" 2>/dev/null || true)" | ||
| fi | ||
| echo "$uuid" | ||
| } | ||
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| # Fallback legacy ID (serial/MAC/machine-id) – used only if UUID is missing/invalid | ||
| get_legacy_id() { | ||
| local device_id="" | ||
| # Raspberry Pi serial | ||
| if [ -f /proc/cpuinfo ]; then | ||
| device_id=$(grep -m1 '^Serial' /proc/cpuinfo 2>/dev/null | cut -d':' -f2 | tr -d ' ' || true) | ||
| fi | ||
| # machine-id (partial) | ||
| if [ -z "${device_id}" ] && [ -f /etc/machine-id ]; then | ||
| device_id=$(head -c 16 /etc/machine-id || true) | ||
| fi | ||
| # first MAC | ||
| if [ -z "${device_id}" ]; then | ||
| device_id=$(ip link show | awk '/ether/ {gsub(":","",$2); print $2; exit}') | ||
| fi | ||
| # random fallback | ||
| if [ -z "${device_id}" ]; then | ||
| device_id=$(tr -dc 'a-f0-9' < /dev/urandom | head -c 16) | ||
| fi | ||
| echo "$device_id" | ||
| } | ||
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| # Generate hostname from UUID (preferred) or legacy ID (fallback) | ||
| generate_hostname() { | ||
| local uuid short_id legacy | ||
| uuid="$(get_device_uuid)" | ||
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| if [ -n "$uuid" ] && is_valid_uuid "$uuid"; then | ||
| uuid="${uuid//-/}" | ||
| uuid="${uuid,,}" | ||
| short_id="${uuid: -8}" | ||
| else | ||
| legacy="$(get_legacy_id)" | ||
| legacy="${legacy//-/}" | ||
| legacy="${legacy,,}" | ||
| short_id="${legacy: -8}" | ||
| fi | ||
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| echo "${PREFIX}-${short_id}" | ||
| } | ||
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| # Set hostname | ||
| set_hostname() { | ||
| local new_hostname="$1" | ||
| local current_hostname | ||
| current_hostname=$(hostname || echo "") | ||
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| if [ "${current_hostname}" = "${new_hostname}" ]; then | ||
| log "Hostname already set to ${new_hostname}" | ||
| return 0 | ||
| fi | ||
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| log "Setting hostname to ${new_hostname}" | ||
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| if command -v hostnamectl >/dev/null 2>&1; then | ||
| hostnamectl set-hostname "${new_hostname}" | ||
| echo "${new_hostname}" > /etc/hostname # menține sincron/compat | ||
| else | ||
| echo "${new_hostname}" > /etc/hostname | ||
| hostname "${new_hostname}" | ||
| fi | ||
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| # Update /etc/hosts (idempotent) | ||
| if [ -f /etc/hosts ]; then | ||
| grep -q "${new_hostname}" /etc/hosts 2>/dev/null || { | ||
| sed -i '/edgeos-/d' /etc/hosts 2>/dev/null || true | ||
| echo "127.0.1.1 ${new_hostname} ${new_hostname}.local" >> /etc/hosts | ||
| } | ||
| else | ||
| echo "127.0.1.1 ${new_hostname} ${new_hostname}.local" > /etc/hosts | ||
| fi | ||
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| log "Hostname set successfully to ${new_hostname}" | ||
| } | ||
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| main() { | ||
| log "Starting EdgeOS hostname generation" | ||
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| # Allow opt-out | ||
| if [ -f /etc/edgeos-hostname-override ]; then | ||
| log "Hostname override found, skipping automatic generation" | ||
| exit 0 | ||
| fi | ||
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| mkdir -p "${STATE_DIR}" | ||
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| local new | ||
| new="$(generate_hostname)" | ||
| set_hostname "${new}" | ||
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| echo "${new}" > "${STATE_HOSTNAME_FILE}" | ||
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| # Restart avahi-daemon to broadcast the new name via mDNS (if present) | ||
| if command -v systemctl >/dev/null 2>&1 && systemctl is-active --quiet avahi-daemon.service; then | ||
| log "Restarting avahi-daemon to pick up new hostname" | ||
| systemctl restart avahi-daemon.service || true | ||
| fi | ||
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| log "EdgeOS hostname generation completed: ${new}" | ||
| } | ||
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| main "$@" | ||
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nice