(#5477) Allow watch_file to watch non-existent files, especially site.pp

The watch_file mechanism would refuse to monitor paths to files that
didn't exist. This patch makes it possible to watch a file that hasn't
been created yet, so when it is created, you manifests will get
reparsed.

Backported this change to 2.6.x

Paired-With: Jacob Helwig <jacob@puppetlabs.com>

2 files changed, 3 insertions, 3 deletions

diff --git a/lib/puppet/parser/lexer.rb b/lib/puppet/parser/lexer.rb
index 9a25263f6..71d9440ff 100644
--- a/lib/puppet/parser/lexer.rb
+++ b/lib/puppet/parser/lexer.rb
@@ -312,7 +312,8 @@ class Puppet::Parser::Lexer
   def file=(file)
     @file = file
     @line = 1
-    @scanner = StringScanner.new(File.read(file))
+    contents = File.exists?(file) ? File.read(file) : ""
+    @scanner = StringScanner.new(contents)
   end
 
   def shift_token
@@ -547,7 +548,7 @@ class Puppet::Parser::Lexer
     value,terminator = slurpstring('"$')
     token_queue << [TOKENS[token_type[terminator]],preamble+value]
     if terminator != '$' or @scanner.scan(/\{/)
-      token_queue.shift 
+      token_queue.shift
     elsif var_name = @scanner.scan(%r{(\w*::)*\w+|[0-9]})
       token_queue << [TOKENS[:VARIABLE],var_name]
       tokenize_interpolated_string(DQ_continuation_token_types)
diff --git a/lib/puppet/parser/parser_support.rb b/lib/puppet/parser/parser_support.rb
index 7a0aa2601..9e580efb2 100644
--- a/lib/puppet/parser/parser_support.rb
+++ b/lib/puppet/parser/parser_support.rb
@@ -88,7 +88,6 @@ class Puppet::Parser::Parser
       unless file =~ /\.pp$/
         file = file + ".pp"
       end
-      raise Puppet::Error, "Could not find file #{file}" unless FileTest.exist?(file)
     end
     raise Puppet::AlreadyImportedError, "Import loop detected" if known_resource_types.watching_file?(file)