Use base58 for random strings

src/commands/build.cr

@@ -1,3 +1,5 @@
+require "base58"
+
 module Faaso
   module Commands
     # Build images for one or more funkos from source
@@ -7,7 +9,7 @@ module Faaso
         # Create temporary build location
 
         funkos.each do |funko|
-          tmp_dir = Path.new("tmp", UUID.random.to_s)
+          tmp_dir = Path.new("tmp", Random.base58(8))
           Dir.mkdir_p(tmp_dir) unless File.exists? tmp_dir
 
           funko.runtime = nil if options["--no-runtime"]

src/daemon/funko.cr

@@ -1,3 +1,4 @@
+require "base58"
 require "docr"
 require "kemal"
 require "../funko.cr"
@@ -34,7 +35,7 @@ module Funko
   # mosquito-cr/mosquito to make it a job queue
   post "/funkos/build/" do |env|
     # Create place to build funko
-    tmp_dir = Path.new("tmp", UUID.random.to_s)
+    tmp_dir = Path.new("tmp", Random.base58(8))
     Dir.mkdir_p(tmp_dir) unless File.exists? tmp_dir
 
     # Expand tarball in there

src/funko.cr

@@ -309,7 +309,7 @@ module Funko
       )
 
       docker_api = Docr::API.new(Docr::Client.new)
-      response = docker_api.containers.create(name: "faaso-#{name}-#{randstr}", config: conf)
+      response = docker_api.containers.create(name: "faaso-#{name}-#{Random.base58(6)}", config: conf)
       response.@warnings.each { |msg| Log.warn { msg } }
       docker_api.containers.start(response.@id) if autostart
       response.@id
@@ -349,8 +349,3 @@ module Funko
     end
   end
 end
-
-def randstr(length = 6) : String
-  chars = "abcdefghijklmnopqrstuvwxyz0123456789"
-  String.new(Bytes.new(chars.to_slice.sample(length).to_unsafe, length))
-end