1 files changed, 20 insertions, 2 deletions
diff --git a/lib/puppet/parser/functions/validate_absolute_path.rb b/lib/puppet/parser/functions/validate_absolute_path.rb
index 46f86ec..fe27974 100644
--- a/lib/puppet/parser/functions/validate_absolute_path.rb
+++ b/lib/puppet/parser/functions/validate_absolute_path.rb
@@ -30,8 +30,26 @@ module Puppet::Parser::Functions
     args.each do |arg|
       # This logic was borrowed from
       # [lib/puppet/file_serving/base.rb](https://github.com/puppetlabs/puppet/blob/master/lib/puppet/file_serving/base.rb)
-      unless Puppet::Util.absolute_path?(arg, :posix) or Puppet::Util.absolute_path?(arg, :windows)
-        raise Puppet::ParseError, ("#{arg.inspect} is not an absolute path.")
+
+      # Puppet 2.7 and beyond will have Puppet::Util.absolute_path?  Fall back to a back-ported implementation otherwise.
+      if Puppet::Util.respond_to?(:absolute_path?) then
+        unless Puppet::Util.absolute_path?(arg, :posix) or Puppet::Util.absolute_path?(arg, :windows)
+          raise Puppet::ParseError, ("#{arg.inspect} is not an absolute path.")
+        end
+      else
+        # This code back-ported from 2.7.x's lib/puppet/util.rb Puppet::Util.absolute_path?
+        # Determine in a platform-specific way whether a path is absolute. This
+        # defaults to the local platform if none is specified.
+        # Escape once for the string literal, and once for the regex.
+        slash = '[\\\\/]'
+        name = '[^\\\\/]+'
+        regexes = {
+          :windows => %r!^(([A-Z]:#{slash})|(#{slash}#{slash}#{name}#{slash}#{name})|(#{slash}#{slash}\?#{slash}#{name}))!i,
+          :posix   => %r!^/!,
+        }
+
+        rval = (!!(arg =~ regexes[:posix])) || (!!(arg =~ regexes[:windows]))
+        rval or raise Puppet::ParseError, ("#{arg.inspect} is not an absolute path.")
       end
     end
   end