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require 'tempfile'
module Puppet::Parser::Functions
newfunction(:validate_augeas, :doc => <<-'ENDHEREDOC') do |args|
Perform validation of a string using an Augeas lens
The first argument of this function should be a string to
test, and the second argument should be the name of the Augeas lens to use.
If Augeas fails to parse the string with the lens, the compilation will
abort with a parse error.
A third argument can be specified, listing paths which should
not be found in the file. The `$file` variable points to the location
of the temporary file being tested in the Augeas tree.
For example, if you want to make sure your passwd content never contains
a user `foo`, you could write:
validate_augeas($passwdcontent, 'Passwd.lns', ['$file/foo'])
Or if you wanted to ensure that no users used the '/bin/barsh' shell,
you could use:
validate_augeas($passwdcontent, 'Passwd.lns', ['$file/*[shell="/bin/barsh"]']
If a fourth argument is specified, this will be the error message raised and
seen by the user.
A helpful error message can be returned like this:
validate_augeas($sudoerscontent, 'Sudoers.lns', [], 'Failed to validate sudoers content with Augeas')
ENDHEREDOC
unless Puppet.features.augeas?
raise Puppet::ParseError, ("validate_augeas(): this function requires the augeas feature. See http://projects.puppetlabs.com/projects/puppet/wiki/Puppet_Augeas#Pre-requisites for how to activate it.")
end
if (args.length < 2) or (args.length > 4) then
raise Puppet::ParseError, ("validate_augeas(): wrong number of arguments (#{args.length}; must be 2, 3, or 4)")
end
msg = args[3] || "validate_augeas(): Failed to validate content against #{args[1].inspect}"
require 'augeas'
aug = Augeas::open(nil, nil, Augeas::NO_MODL_AUTOLOAD)
begin
content = args[0]
# Test content in a temporary file
tmpfile = Tempfile.new("validate_augeas")
begin
tmpfile.write(content)
ensure
tmpfile.close
end
# Check for syntax
lens = args[1]
aug.transform(
:lens => lens,
:name => 'Validate_augeas',
:incl => tmpfile.path
)
aug.load!
unless aug.match("/augeas/files#{tmpfile.path}//error").empty?
error = aug.get("/augeas/files#{tmpfile.path}//error/message")
msg += " with error: #{error}"
raise Puppet::ParseError, (msg)
end
# Launch unit tests
tests = args[2] || []
aug.defvar('file', "/files#{tmpfile.path}")
tests.each do |t|
msg += " testing path #{t}"
raise Puppet::ParseError, (msg) unless aug.match(t).empty?
end
ensure
aug.close
tmpfile.unlink
end
end
end
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