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119 lines
3.1 KiB
119 lines
3.1 KiB
2 months ago
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#!/bin/sh
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DAEMON=/usr/bin/tera-seriald
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PIDFILE=/run/tera-seriald/tera-seriald.pid
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ENVFILE=/etc/tera/tera-seriald.env
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RUN_AS=tera:tera
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ensure_account() {
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if ! grep -q '^tera:' /etc/group; then
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addgroup -S tera || return 1
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fi
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if ! id tera >/dev/null 2>&1; then
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adduser -S -D -H -s /bin/false -G tera tera || return 1
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fi
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normalize_service_account_password || return 1
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}
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normalize_service_account_password() {
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shadow_value="$(awk -F: '$1 == "tera" { print $2 }' /etc/shadow)" || return 1
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case "$shadow_value" in
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""|!*) ;;
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\**) ;;
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*) return 0 ;;
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esac
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command -v mkpasswd >/dev/null 2>&1 || return 1
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random_secret="$(dd if=/dev/urandom bs=48 count=1 2>/dev/null | sha256sum | cut -d' ' -f1)" || return 1
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password_hash="$(mkpasswd -m sha-256 "$random_secret")" || return 1
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unset random_secret
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temporary_shadow="/etc/.shadow.tera.$$"
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trap 'rm -f "$temporary_shadow"' EXIT HUP INT TERM
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awk -F: -v OFS=: -v replacement="$password_hash" '
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$1 == "tera" { $2 = replacement; found = 1 }
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{ print }
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END { if (!found) exit 1 }
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' /etc/shadow >"$temporary_shadow" || return 1
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chown 0:0 "$temporary_shadow" || return 1
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chmod 0600 "$temporary_shadow" || return 1
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mv -f "$temporary_shadow" /etc/shadow || return 1
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trap - EXIT HUP INT TERM
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}
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wait_for_mapped_devices() {
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mapping="${TERA_SERIALD_MAPPING:-/etc/tera/serial-map.json}"
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[ -r "$mapping" ] || { echo "missing serial mapping $mapping" >&2; return 1; }
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devices="$(sed -n 's/.*"device":[[:space:]]*"\([^"]*\)".*/\1/p' "$mapping")" || return 1
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[ "$(printf '%s\n' "$devices" | grep -c '^/dev/ttyWCH[0-9][0-9]*$')" -eq 48 ] || {
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echo "serial mapping must contain exactly 48 WCH devices" >&2
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return 1
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}
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attempt=0
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while [ "$attempt" -lt 100 ]; do
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missing=0
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for device in $devices; do
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[ -c "$device" ] || { missing=1; break; }
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done
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[ "$missing" -eq 0 ] && return 0
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attempt=$((attempt + 1))
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sleep 0.1
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done
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echo "mapped WCH devices did not appear within 10 seconds" >&2
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return 1
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}
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prepare_runtime() {
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ensure_account || return 1
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wait_for_mapped_devices || return 1
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mkdir -p /run/tera-seriald /var/log/tera || return 1
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chown tera:tera /run/tera-seriald /var/log/tera || return 1
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for device in /dev/ttyWCH*; do
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[ -c "$device" ] || continue
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chgrp tera "$device" || return 1
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chmod 0660 "$device" || return 1
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done
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}
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load_environment() {
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if [ -r "$ENVFILE" ]; then
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set -a
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. "$ENVFILE"
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set +a
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fi
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}
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is_running() {
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[ -r "$PIDFILE" ] || return 1
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pid="$(cat "$PIDFILE" 2>/dev/null)"
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[ -n "$pid" ] && kill -0 "$pid" 2>/dev/null
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}
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start_service() {
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if is_running; then
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echo "tera-seriald is already running"
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return 0
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fi
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rm -f "$PIDFILE"
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[ -x "$DAEMON" ] || { echo "missing $DAEMON" >&2; return 1; }
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load_environment
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prepare_runtime || return 1
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start-stop-daemon -S -q -b -m -p "$PIDFILE" -c "$RUN_AS" -x "$DAEMON"
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}
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stop_service() {
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if ! is_running; then
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rm -f "$PIDFILE"
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return 0
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fi
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start-stop-daemon -K -q -p "$PIDFILE" -x "$DAEMON"
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rm -f "$PIDFILE"
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}
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case "$1" in
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start) start_service ;;
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stop) stop_service ;;
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restart) stop_service && start_service ;;
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status) is_running ;;
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*) echo "Usage: $0 {start|stop|restart|status}" >&2; exit 1 ;;
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esac
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