1 files changed, 56 insertions, 0 deletions
diff --git a/lib/puppet/parser/functions/validate_absolute_path.rb b/lib/puppet/parser/functions/validate_absolute_path.rb
new file mode 100644
index 0000000..fe27974
--- /dev/null
+++ b/lib/puppet/parser/functions/validate_absolute_path.rb
@@ -0,0 +1,56 @@
+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)
+
+
+    The following values will fail, causing compilation to abort:
+
+        validate_absolute_path(true)
+        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|
+      # 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?(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
+end