Land rapid7#2324, make retab backups optional

Author: egypt

tools/dev/retab.rb

@@ -4,19 +4,32 @@
 # Replace leading tabs with 2-width spaces.
 # I'm sure there's a sed/awk/perl oneliner that's
 # a million times better but this is more readable for me.
+# 
+# Usage:
+# metasploit-framework$ ./tools/dev/retab.rb [path]
+#
+# If local backups are desired, prepend with "MSF_RETAB_BACKUPS" set,
+# like so:
+# metasploit-framework$ MSF_RETAB_BACKUPS=1 ./tools/dev/retab.rb [path]
 
 require 'fileutils'
 require 'find'
 
 dir = ARGV[0] || "."
+keep_backups = !!(ENV['MSF_RETAB_BACKUPS'] || ENV['MSF_RETAB_BACKUP'])
+puts "Keeping .notab backups" if keep_backups
+
 raise ArgumentError, "Need a filename or directory" unless (dir and File.readable? dir)
 
 Find.find(dir) do |infile|
   next unless File.file? infile
   next unless infile =~ /rb$/
 outfile = infile
-backup = "#{infile}.notab"
-FileUtils.cp infile, backup
+
+if keep_backups
+  backup = "#{infile}.notab"
+  FileUtils.cp infile, backup
+end
 
 data = File.open(infile, "rb") {|f| f.read f.stat.size}
 fixed = []