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require 'puppet/util/execution'
require 'tempfile'
module Puppet::Parser::Functions
newfunction(:validate_cmd, :doc => <<-'ENDHEREDOC') do |args|
Perform validation of a string with an external command.
The first argument of this function should be a string to
test, and the second argument should be a path to a test command
taking a % as a placeholder for the file path (will default to the end).
If the command, launched against a tempfile containing the passed string,
returns a non-null value, compilation will abort with a parse error.
If a third argument is specified, this will be the error message raised and
seen by the user.
A helpful error message can be returned like this:
Example:
# Defaults to end of path
validate_cmd($sudoerscontent, '/usr/sbin/visudo -c -f', 'Visudo failed to validate sudoers content')
# % as file location
validate_cmd($haproxycontent, '/usr/sbin/haproxy -f % -c', 'Haproxy failed to validate config content')
ENDHEREDOC
if (args.length < 2) or (args.length > 3) then
raise Puppet::ParseError, ("validate_cmd(): wrong number of arguments (#{args.length}; must be 2 or 3)")
end
msg = args[2] || "validate_cmd(): failed to validate content with command #{args[1].inspect}"
content = args[0]
checkscript = args[1]
# Test content in a temporary file
tmpfile = Tempfile.new("validate_cmd")
begin
tmpfile.write(content)
tmpfile.close
if checkscript =~ /\s%(\s|$)/
check_with_correct_location = checkscript.gsub(/%/,tmpfile.path)
else
check_with_correct_location = "#{checkscript} #{tmpfile.path}"
end
if Puppet::Util::Execution.respond_to?('execute')
Puppet::Util::Execution.execute(check_with_correct_location)
else
Puppet::Util.execute(check_with_correct_location)
end
rescue Puppet::ExecutionFailure => detail
msg += "\n#{detail}"
raise Puppet::ParseError, msg
rescue Exception => detail
msg += "\n#{detail.class.name} #{detail}"
raise Puppet::ParseError, msg
ensure
tmpfile.unlink
end
end
end
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