Add contrib/library_autoupdater.sh (#1096)

This script is using inotify to watch your music folders and trigger a new library scan 10 minutes after a notification has been send from inotify.

contrib/library_autoupdater.sh

@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+
+set -u
+
+info() {
+  echo "$(date -Iseconds) - $*"
+}
+
+error() {
+  info >&2 "$*"
+  exit 1
+}
+
+
+# Make sure only root can run our script
+(( $(id -u) == 0 )) || error "this script must be run as root!"
+
+# COMMANDS
+typeset -r cmd_which="/usr/bin/which" && [[ -x $cmd_which ]] || error "which command not found"
+typeset -r cmd_curl=$($cmd_which curl) && [[ -x $cmd_curl ]] || error "curl command not found"
+typeset -r cmd_inotifywait=$($cmd_which inotifywait) && [[ -x $cmd_inotifywait ]] || error "inotifywait command not found"
+typeset -r cmd_md5sum=$($cmd_which md5sum) && [[ -x $cmd_md5sum ]] || error "md5sum command not found"
+typeset -r cmd_awk=$($cmd_which awk) && [[ -x $cmd_awk ]] || error "awk command not found"
+typeset -r cmd_openssl=$($cmd_which openssl) && [[ -x $cmd_openssl ]] || error "openssl command not found"
+
+# VARS
+typeset -r dirs="/var/music"
+typeset -r username="admin"
+
+# typeset -r password=""
+# typeset -r salt="$($cmd_openssl rand -hex 20)"
+# typeset -r token="$(echo -n "${password}${salt}" | $cmd_md5sum | $cmd_awk '{ print $1 }')"
+
+typeset -r salt=""
+typeset -r token=""
+typeset -r server=""
+typeset -r client="scan-trigger"
+
+trigger_scan() {
+  typeset -r url="${server}/rest/startScan?u=${username}&t=${token}&s=${salt}&v=1.15.0&c=${client}"
+
+  response=$($cmd_curl -s $url)
+  echo $response | grep -q 'status="ok"' || error "Scan request failed"
+  echo $response | grep -q 'scanning="false"' || info "Server is already scanning"
+}
+
+info "Start watching dirs '$dirs'"
+info "Press CTRL+C to stop..."
+for (( ; ; )) do
+  $cmd_inotifywait -r -qq \
+    -e modify \
+    -e move \
+    -e create \
+    -e delete \
+    $dirs
+
+  info "Event received, waiting 10 minutes before triggering new scan"
+  sleep 3600 # Wait 10 minutes before triggering the scan
+  trigger_scan
+  sleep 5
+done
+
+# EOF