Configure log for media listener

Dockerfile

@@ -5,7 +5,7 @@ FROM base AS builder
 ENV RAILS_ENV production
 ENV NODE_ENV production
 
-# build for musl-libc, not glibc (see https://github.com/sparklemotion/nokogiri/issues/2075, https://github.com/rubygems/rubygems/issues/3174)
+# Build for musl-libc, not glibc (see https://github.com/sparklemotion/nokogiri/issues/2075, https://github.com/rubygems/rubygems/issues/3174)
 ENV BUNDLE_FORCE_RUBY_PLATFORM 1
 
 COPY --from=node /usr/local/bin/node /usr/local/bin/node
@@ -56,6 +56,9 @@ RUN addgroup -g 1000 -S app && adduser -u 1000 -S app -G app
 COPY --from=builder --chown=app:app /usr/local/bundle/ /usr/local/bundle/
 COPY --from=builder --chown=app:app /app/ /app/
 
+# Forwards media listener logs to stdout so they can be captured in docker logs.
+RUN ln -sf /dev/stdout /app/log/media_listener_production.log
+
 USER app
 
 ENTRYPOINT ["docker/entrypoint.sh"]

lib/daemons/media_listener_service

@@ -25,14 +25,20 @@ daemon_options = {
   dir_mode: :normal,
   dir: options[:dir],
   multiple: false,
-  shush: ENV["RAILS_ENV"] == "test"
+  shush: ENV["RAILS_ENV"] == "test",
+  log_output: true,
+  log_dir: File.join(ROOT_DIR, "log"),
+  output_logfilename: "media_listener_#{ENV["RAILS_ENV"]}.log"
 }
 
 Daemons.run_proc(options[:name], daemon_options) do
   Dir.chdir ROOT_DIR
 
   require "./config/environment"
 
+  listener_log_level = (ENV["RAILS_ENV"] == "production") ? :info : :debug
+  Listen.logger = ::Logger.new($stdout, level: ENV.fetch("RAILS_LOG_LEVEL", listener_log_level))
+
   supported_formates = MediaFile::SUPPORTED_FORMATS.map { |formate| %r{\.#{formate}$} }
 
   listener = Listen.to(File.expand_path(Setting.media_path), only: supported_formates, latency: 5, wait_for_delay: 10) do |modified, added, removed|