test-config: dynamically build test.conf to provide absolute paths

redis config requires absolute paths for pidfile, unixsocket, and logfile
directives, and interprets relative paths incorrectly without errors.

Dynamically build the test.conf from an erb file if it is not present. This
has the side-effect of creating a single source of truth for these values.

Resolves #439

Author: yaauie

.gitignore

@@ -9,3 +9,4 @@
 /rdsrv
 /redis/*
 /test/db
+/test/test.conf

Rakefile

@@ -5,6 +5,8 @@ ENV["REDIS_BRANCH"] ||= "unstable"
 REDIS_DIR = File.expand_path(File.join("..", "test"), __FILE__)
 REDIS_CNF = File.join(REDIS_DIR, "test.conf")
 REDIS_PID = File.join(REDIS_DIR, "db", "redis.pid")
+REDIS_LOG = File.join(REDIS_DIR, "db", "redis.log")
+REDIS_SOCKET = File.join(REDIS_DIR, "db", "redis.sock")
 BINARY = "tmp/redis-#{ENV["REDIS_BRANCH"]}/src/redis-server"
 
 task :default => :run
@@ -13,7 +15,7 @@ desc "Run tests and manage server start/stop"
 task :run => [:start, :test, :stop]
 
 desc "Start the Redis server"
-task :start => BINARY do
+task :start => [BINARY, REDIS_CNF] do
   sh "#{BINARY} --version"
 
   redis_running = \
@@ -46,6 +48,7 @@ end
 desc "Clean up testing artifacts"
 task :clean do
   FileUtils.rm_f(BINARY)
+  FileUtils.rm_f(REDIS_CNF)
 end
 
 file BINARY do
@@ -62,6 +65,19 @@ file BINARY do
   SH
 end
 
+file REDIS_CNF do
+  require 'erb'
+  template_path = "#{REDIS_CNF}.erb"
+  template = File.read("#{REDIS_CNF}.erb")
+  File.open(REDIS_CNF, 'w') do |file|
+    file.puts "\# This file was auto-generated at #{Time.now}",
+              "\# from (#{"#{REDIS_CNF}.erb"})",
+              "\#"
+    conf = ERB.new(template).result
+    file << conf
+  end
+end
+
 Rake::TestTask.new do |t|
   t.options = "-v" if $VERBOSE
   t.test_files = FileList["test/*_test.rb"]

test/test.conf

@@ -0,0 +1,9 @@
+dir <%=        REDIS_DIR %>
+pidfile <%=    REDIS_PID %>
+port 6381
+unixsocket <%= REDIS_SOCKET %>
+timeout 300
+loglevel debug
+logfile <%=    REDIS_LOG %>
+databases 16
+daemonize yes