Add support for a 'match' parameter to file_line

This commit adds a new parameter called "match"
to the file_line resource type, and support for
this new parameter to the corresponding ruby
provider.

This parameter is optional; file_line should work
just as before if you do not specify this parameter...
so this change should be backwards-compatible.

If you do specify the parameter, it is treated
as a regular expression that should be used when
looking through the file for a line.  This allows
you to do things like find a line that begins with
a certain prefix (e.g., "foo=.*"), and *replace*
the existing line with the line you specify in your
"line" parameter.  Without this capability, if you
already had a line "foo=bar" in your file and your
"line" parameter was set to "foo=baz", you'd end up
with *both* lines in the final file.  In many cases
this is undesirable.

1 files changed, 24 insertions, 0 deletions

diff --git a/spec/unit/puppet/type/file_line_spec.rb b/spec/unit/puppet/type/file_line_spec.rb
index c86dbd2..e1c07ac 100644
--- a/spec/unit/puppet/type/file_line_spec.rb
+++ b/spec/unit/puppet/type/file_line_spec.rb
@@ -7,6 +7,30 @@ describe Puppet::Type.type(:file_line) do
   it 'should accept a line and path' do
     file_line[:line] = 'my_line'
     file_line[:line].should == 'my_line'
+    file_line[:path] = '/my/path'
+    file_line[:path].should == '/my/path'
+  end
+  it 'should accept a match regex' do
+    file_line[:match] = '^foo.*$'
+    file_line[:match].should == '^foo.*$'
+  end
+  it 'should not accept a match regex that does not match the specified line' do
+    expect {
+      Puppet::Type.type(:file_line).new(
+          :name   => 'foo',
+          :path   => '/my/path',
+          :line   => 'foo=bar',
+          :match  => '^bar=blah$'
+    )}.to raise_error(Puppet::Error, /the value must be a regex that matches/)
+  end
+  it 'should accept a match regex that does match the specified line' do
+    expect {
+      Puppet::Type.type(:file_line).new(
+          :name   => 'foo',
+          :path   => '/my/path',
+          :line   => 'foo=bar',
+          :match  => '^\s*foo=.*$'
+      )}.not_to raise_error
   end
   it 'should accept posix filenames' do
     file_line[:path] = '/tmp/path'