bin/setup-local: introduce --dry-run option

get the steps with '--dry-run' option
--------------
root@shao2-debian:/lkp-tests# bin/setup-local -s borrow-1h-1h.yaml 2>/dev/null
cd /lkp-tests/bin/event && make wakeup
mkdir -p /lkp-tests/tmp /lkp/paths /lkp/benchmarks
/lkp-tests/distro/installer/debian bc gawk time kmod gzip make automake gcc build-essential libtool patch git openssl linux-perf ca-certificates rsync cpio wget libklibc-dev linux-libc-dev linux-libc-dev:i386 libc6-dev libc6-dev:i386 ruby ruby-dev bzip2 bsdtar fakeroot flex bison libssl-dev libipc-run-perl
/lkp-tests/distro/installer/debian curl bsdtar bzip2 fakeroot gnupg gettext openssl ncurses-bin binutils
/lkp-tests/distro/installer/debian procps
--------------

Signed-off-by: Chen Rong <[email protected]>
Signed-off-by: Philip Li <[email protected]>

bin/setup-local

@@ -12,6 +12,7 @@ require "#{LKP_SRC}/lib/yaml"
 require "#{LKP_SRC}/lib/job"
 require "#{LKP_SRC}/lib/distro-info"
 require "#{LKP_SRC}/lib/install"
+require "#{LKP_SRC}/lib/common"
 
 TMP = LKP_SRC + '/tmp'
 
@@ -22,6 +23,7 @@ end
 
 $opt_hdd = []
 $opt_ssd = []
+$dryrun = false
 
 opt_parser = OptionParser.new do |opts|
   opts.banner = 'Usage: setup-local [options] <script>/<jobfile>'
@@ -37,6 +39,12 @@ opt_parser = OptionParser.new do |opts|
     $opt_ssd << ssd
   end
 
+  opts.on('-s', '--dry-run', 'Perform a simulation of events') do
+    alias system puts_stdout # only output system commands to stdout
+    alias puts puts_stderr   # redirect logs to stderr to leave stdout to commands
+    $dryrun = true
+  end
+
   opts.on_tail('-h', '--help', 'Show this message') do
     puts opts
     exit
@@ -70,12 +78,16 @@ end
 scripts.uniq!
 
 def make_wakeup
-  return if File.executable? LKP_SRC + '/bin/event/wakeup'
+  return if !$dryrun && File.executable?(LKP_SRC + '/bin/event/wakeup')
 
   system "cd #{LKP_SRC}/bin/event && make wakeup"
 end
 
 def create_lkp_dirs
+  if $dryrun
+    system "mkdir -p #{TMP} /lkp/paths /lkp/benchmarks"
+    return
+  end
   FileUtils.mkdir_p TMP
   FileUtils.mkdir_p '/lkp/paths'
   FileUtils.mkdir_p '/lkp/benchmarks'
@@ -86,6 +98,7 @@ def create_host_config
   if File.exist? host_config
     puts 'reusing ' + host_config
   else
+    puts 'creating ' + host_config
     mem_kb = File.open('/proc/meminfo').gets.split[1].to_i
     mem_gb = mem_kb >> 20
     mem_gb = (mem_gb + 3) & 0xfffffffc

lib/common.rb

@@ -193,6 +193,16 @@ def bash
 
 ## IO redirection
 
+def puts_stdout(*args)
+  $stdout.puts *args.join(' ')
+  return 0
+end
+
+def puts_stderr(*args)
+  $stderr.puts *args.join(' ')
+  return 0
+end
+
 def redirect_to(io)
   saved_stdout = $stdout
   $stdout = io