Add package_manifest resource.

This patch converts the write_package_names function into
a proper resource. Using the write_package_names only works
if the function comes last in the puppet manifest. By
making the same functionality a custom resource we allow
for it to exist anywhere in the manifest and provide the
same functionality.

 The new syntax would be:

 package_manifest{'/tmp/foo': ensure => present}

Co-Authored-By: Martin Mágr <mmagr@redhat.com>
Change-Id: If3e03b1983fed47082fac8ce63f975557dbc503c

1 files changed, 39 insertions, 0 deletions

diff --git a/lib/puppet/provider/package_manifest/flat_file.rb b/lib/puppet/provider/package_manifest/flat_file.rb
new file mode 100644
index 0000000..96e033b
--- /dev/null
+++ b/lib/puppet/provider/package_manifest/flat_file.rb
@@ -0,0 +1,39 @@
+
+require 'set'
+
+
+Puppet::Type.type(:package_manifest).provide(:flat_file) do
+
+  desc "Write package manifest to a flat file"
+
+  def exists?
+    # exists? is always run before create, so we can create package list here
+    @packages = resource.catalog.resources.collect { |r|
+        r.name if r.type == :package
+    }.compact.sort
+
+    exists = File.exist?(resource[:path])
+    if exists
+      new_content = Set.new @packages
+      old_content = Set.new(
+        File.open(resource[:path], 'r').each_line.collect{ |pkg| pkg.strip() }
+      )
+      exists = new_content == old_content
+    end
+    exists
+  end
+
+  def create
+    FileUtils.mkdir_p(File.dirname(resource[:path]))
+    File.open(resource[:path], 'w') do |f|
+      @packages.each do |pkg_name|
+        f.puts(pkg_name)
+      end
+    end
+  end
+
+  def destroy
+    File.delete(resource[:path])
+  end
+
+end