Turn CentOS factset duplicating into a rake task

README.md

@@ -162,9 +162,7 @@ for file in facts/*/*-x86_64.facts; do cat $file | sed -e 's/x86_64/i386/' -e 's
 Create RedHat, Scientific, OracleLinux facts from CentOS's ones
 
 ```
-for file in facts/*/centos-*.facts; do cat $file | sed -e 's/CentOS/RedHat/' > $(echo $file | sed 's/centos/redhat/'); done
-for file in facts/*/centos-*.facts; do cat $file | sed -e 's/CentOS/Scientific/' > $(echo $file | sed 's/centos/scientific/'); done
-for file in facts/*/centos-*.facts; do cat $file | sed -e 's/CentOS/OracleLinux/' > $(echo $file | sed 's/centos/oraclelinux/'); done
+$ bundle exec rake rhel_alts
 ```
 
 Then update array `Facter version and Operating System coverage` with output of rake task `table`.

rakelib/rhel_alts.rake

@@ -0,0 +1,24 @@
+desc 'Create RHEL/OracleLinux/Scientific factsets from CentOS factsets'
+task :rhel_alts do
+  Dir[File.join(__dir__, '..', 'facts', '*', 'centos-*-x86_64.facts')].each do |f|
+    centos_factset = File.read(f)
+
+    rhel_path = f.gsub(%r{centos-}, 'redhat-')
+    File.open(rhel_path, 'w') do |fd|
+      fd.puts centos_factset.gsub(%r{CentOS}, 'RedHat')
+    end
+
+    oracle_path = f.gsub(%r{centos-}, 'oraclelinux-')
+    File.open(oracle_path, 'w') do |fd|
+      fd.puts centos_factset.gsub(%r{CentOS}, 'OracleLinux')
+    end
+
+    # Scientific isn't going to be updated to 8
+    if File.basename(f)[%r{-(\d+)-}, 1].to_i <= 7
+      scientific_path = f.gsub(%r{centos-}, 'scientific-')
+      File.open(scientific_path, 'w') do |fd|
+        fd.puts centos_factset.gsub(%r{CentOS}, 'Scientific')
+      end
+    end
+  end
+end