1 files changed, 69 insertions, 0 deletions
diff --git a/puppet/modules/stdlib/lib/puppet/parser/functions/validate_absolute_path.rb b/puppet/modules/stdlib/lib/puppet/parser/functions/validate_absolute_path.rb
new file mode 100644
index 00000000..b6966809
--- /dev/null
+++ b/puppet/modules/stdlib/lib/puppet/parser/functions/validate_absolute_path.rb
@@ -0,0 +1,69 @@
+module Puppet::Parser::Functions
+  newfunction(:validate_absolute_path, :doc => <<-'ENDHEREDOC') do |args|
+    Validate the string represents an absolute path in the filesystem.  This function works
+    for windows and unix style paths.
+
+    The following values will pass:
+
+        $my_path = 'C:/Program Files (x86)/Puppet Labs/Puppet'
+        validate_absolute_path($my_path)
+        $my_path2 = '/var/lib/puppet'
+        validate_absolute_path($my_path2)
+        $my_path3 = ['C:/Program Files (x86)/Puppet Labs/Puppet','C:/Program Files/Puppet Labs/Puppet']
+        validate_absolute_path($my_path3)
+        $my_path4 = ['/var/lib/puppet','/usr/share/puppet']
+        validate_absolute_path($my_path4)
+
+    The following values will fail, causing compilation to abort:
+
+        validate_absolute_path(true)
+        validate_absolute_path('../var/lib/puppet')
+        validate_absolute_path('var/lib/puppet')
+        validate_absolute_path([ 'var/lib/puppet', '/var/foo' ])
+        validate_absolute_path([ '/var/lib/puppet', 'var/foo' ])
+        $undefined = undef
+        validate_absolute_path($undefined)
+
+    ENDHEREDOC
+
+    require 'puppet/util'
+
+    unless args.length > 0 then
+      raise Puppet::ParseError, ("validate_absolute_path(): wrong number of arguments (#{args.length}; must be > 0)")
+    end
+
+    args.each do |arg|
+      # put arg to candidate var to be able to replace it
+      candidates = arg
+      # if arg is just a string with a path to test, convert it to an array
+      # to avoid test code duplication
+      unless arg.is_a?(Array) then
+        candidates = Array.new(1,arg)
+      end
+      # iterate over all pathes within the candidates array
+      candidates.each do |path|
+        # This logic was borrowed from
+        # [lib/puppet/file_serving/base.rb](https://github.com/puppetlabs/puppet/blob/master/lib/puppet/file_serving/base.rb)
+        # 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?(path, :posix) or Puppet::Util.absolute_path?(path, :windows)
+            raise Puppet::ParseError, ("#{path.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 = (!!(path =~ regexes[:posix])) || (!!(path =~ regexes[:windows]))
+          rval or raise Puppet::ParseError, ("#{path.inspect} is not an absolute path.")
+        end
+      end
+    end
+  end
+end