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authorChris Price <chris@puppetlabs.com>2012-06-07 09:09:14 -0700
committerJeff McCune <jeff@puppetlabs.com>2012-08-14 09:55:30 -0700
commita06c0d8115892a74666676b50d4282df9850a119 (patch)
tree0ded58647c134dafa32604725b010f32a465164f /lib
parentf30885118843f2eef15c048fe2cb504d7eaf8f77 (diff)
downloadpuppet-stdlib-a06c0d8115892a74666676b50d4282df9850a119.tar.gz
puppet-stdlib-a06c0d8115892a74666676b50d4282df9850a119.tar.bz2
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.
Diffstat (limited to 'lib')
-rw-r--r--lib/puppet/provider/file_line/ruby.rb36
-rw-r--r--lib/puppet/type/file_line.rb12
2 files changed, 46 insertions, 2 deletions
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
diff --git a/lib/puppet/type/file_line.rb b/lib/puppet/type/file_line.rb
index f6fe1d0..6b35902 100644
--- a/lib/puppet/type/file_line.rb
+++ b/lib/puppet/type/file_line.rb
@@ -32,6 +32,11 @@ Puppet::Type.newtype(:file_line) do
desc 'An arbitrary name used as the identity of the resource.'
end
+ newparam(:match) do
+ desc 'An optional regular expression to run against existing lines in the file;\n' +
+ 'if a match is found, we replace that line rather than adding a new line.'
+ end
+
newparam(:line) do
desc 'The line to be appended to the file located by the path parameter.'
end
@@ -49,5 +54,12 @@ Puppet::Type.newtype(:file_line) do
unless self[:line] and self[:path]
raise(Puppet::Error, "Both line and path are required attributes")
end
+
+ if (self[:match])
+ unless Regexp.new(self[:match]).match(self[:line])
+ raise(Puppet::Error, "When providing a 'match' parameter, the value must be a regex that matches against the value of your 'line' parameter")
+ end
+ end
+
end
end