gc in docker-utils-0.1.34

- old
+ new
@@ -1,39 +1,70 @@
 #!/usr/bin/env ruby
 
-containers = `docker ps -a -q`.chomp.split("\n").sort
+DockerBinaryLocation = `which docker`.chomp
 
-purge_all = ARGV.delete('-a')
-kill_running_containers = ARGV.delete('-r') || purge_all
-delete_data_containers = ARGV.delete('-d') || purge_all
-delete_tagged_images = ARGV.delete('-t') || purge_all
+def cmd(*args)
+  io = IO.popen(args, err: '/dev/null')
+  io.read.split("\n")
+end
 
-unless kill_running_containers
-  running_containers = `docker ps -q`.chomp.split("\n").sort
-  containers = containers - running_containers
+def docker(*args)
+  cmd(DockerBinaryLocation, *args)
 end
 
-unless delete_data_containers
-  containers = containers.find_all do |cid|
-    container_name = `docker inspect -f '{{.Name}}' #{cid}`.chomp[1..-1]
-    container_name !~ /-data$/
+tasks = [:remove_containers, :remove_volumes, :remove_images]
+container_filter = [:running]
+image_filter = [:untagged]
+
+while task_pattern = ARGV.shift
+  case task_pattern.intern
+  when :all
+    container_filter = []
+    image_filter = []
+  when :running
+    container_filter -= [:running]
+  when :volumes
+    #
+  when :images
+    image_filter -= [:untagged]
   end
 end
 
-containers.each do |cid|
-  system 'docker', 'kill', cid, err: '/dev/null'
-  system 'docker', 'rm', cid, err: '/dev/null'
+
+containers = docker('ps', '-a', '-q').sort
+
+if container_filter.include? :running
+  running_containers = docker('ps', '-q').sort
+  containers = containers - running_containers
 end
 
-images = `docker images`.chomp.split("\n")[1..-1].map do |ln|
+
+images = docker('images')[1..-1].map do |ln|
   parts = ln.split(' ').map{ |part| part unless part == '<none>' }
   image_name = (parts[0] and parts[1]) ? "#{parts[0]}:#{parts[1]}" : nil
   {id: parts[2], name: image_name}
 end
 
-unless delete_tagged_images
+if image_filter.include? :untagged
   images = images.delete_if{ |image| image[:name] }
 end
 
-images.each do |image|
-  system 'docker', 'rmi', '-f', image[:id]
-end
\ No newline at end of file
+
+
+if tasks.include? :remove_containers and containers.length.nonzero?
+  puts "removing containers"
+  containers.each do |cid|
+    docker 'kill', cid
+    docker 'rm', cid
+
+    puts "  #{cid}"
+  end
+end
+
+if tasks.include? :remove_images and images.length.nonzero?
+  puts "removing image layers"
+  images.each do |image|
+    docker 'rmi', '-f', image[:id]
+
+    puts "  #{image[:name]} #{image[:id]}"
+  end
+end