From a06c0d8115892a74666676b50d4282df9850a119 Mon Sep 17 00:00:00 2001
From: Chris Price <chris@puppetlabs.com>
Date: Thu, 7 Jun 2012 09:09:14 -0700
Subject: 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.
---
lib/puppet/provider/file_line/ruby.rb | 36 +++++++++++++++++++++++++++++++++--
1 file changed, 34 insertions(+), 2 deletions(-)
(limited to 'lib/puppet/provider/file_line')
diff --git a/lib/puppet/provider/file_line/ruby.rb b/lib/puppet/provider/file_line/ruby.rb
index f5d3a32..e21eaa8 100644
--- a/lib/puppet/provider/file_line/ruby.rb
+++ b/lib/puppet/provider/file_line/ruby.rb
@@ -1,3 +1,4 @@
+
Puppet::Type.type(:file_line).provide(:ruby) do
def exists?
@@ -7,8 +8,10 @@ Puppet::Type.type(:file_line).provide(:ruby) do
end
def create
- File.open(resource[:path], 'a') do |fh|
- fh.puts resource[:line]
+ if resource[:match]
+ handle_create_with_match()
+ else
+ handle_create_without_match()
end
end
@@ -21,7 +24,36 @@ Puppet::Type.type(:file_line).provide(:ruby) do
private
def lines
+ # If this type is ever used with very large files, we should
+ # write this in a different way, using a temp
+ # file; for now assuming that this type is only used on
+ # small-ish config files that can fit into memory without
+ # too much trouble.
@lines ||= File.readlines(resource[:path])
end
+ def handle_create_with_match()
+ regex = resource[:match] ? Regexp.new(resource[:match]) : nil
+ match_count = lines.select { |l| regex.match(l) }.count
+ if match_count > 1
+ raise Puppet::Error, "More than one line in file '#{resource[:path]}' matches pattern '#{resource[:match]}'"
+ end
+ File.open(resource[:path], 'w') do |fh|
+ lines.each do |l|
+ fh.puts(regex.match(l) ? resource[:line] : l)
+ end
+
+ if (match_count == 0)
+ fh.puts(resource[:line])
+ end
+ end
+ end
+
+ def handle_create_without_match
+ File.open(resource[:path], 'a') do |fh|
+ fh.puts resource[:line]
+ end
+ end
+
+
end
--
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