> *Note:* As of version 3.7, Puppet Enterprise no longer includes the stdlib module. If you're running Puppet Enterprise, you should install the most recent release of stdlib for compatibility with Puppet modules.
*`stdlib`: Most of stdlib's features are automatically loaded by Puppet. To use standardized run stages in Puppet, declare this class in your manifest with `include stdlib`.
*`stdlib::stages`: This class manages a standard set of run stages for Puppet. It is managed by the stdlib class and should not be declared independently.
The `stdlib::stages` class declares various run stages for deploying infrastructure, language runtimes, and application layers. The high level stages are (in order):
*`file_line`: This resource ensures that a given line, including whitespace at the beginning and end, is contained within a file. If the line is not contained in the given file, Puppet will add the line. Multiple resources can be declared to manage multiple lines in the same file. You can also use match to replace existing lines.
*`after`: Specify the line after which Puppet will add any new lines. (Existing lines are added in place.) Optional.
*`ensure`: Ensures whether the resource is present. Valid values are 'present', 'absent'.
*`line`: The line to be added to the file located by the `path` parameter.
*`match`: A regular expression to run against existing lines in the file; if a match is found, we replace that line rather than adding a new line. Optional.
*`multiple`: Determine if match can change multiple lines. Valid values are 'true', 'false'. Optional.
*`name`: An arbitrary name used as the identity of the resource.
*`path`: The file in which Puppet will ensure the line specified by the line parameter.
*`abs`: Returns the absolute value of a number; for example, '-34.56' becomes '34.56'. Takes a single integer and float value as an argument. *Type*: rvalue
*`any2array`: This converts any object to an array containing that object. Empty argument lists are converted to an empty array. Arrays are left untouched. Hashes are converted to arrays of alternating keys and values. *Type*: rvalue
*`chop`: Returns a new string with the last character removed. If the string ends with '\r\n', both characters are removed. Applying `chop` to an empty string returns an empty string. If you want to merely remove record separators, then you should use the `chomp` function. Requires a string or an array of strings as input. *Type*: rvalue
*`count`: Takes an array as first argument and an optional second argument. Count the number of elements in array that matches second argument. If called with only an array, it counts the number of elements that are **not** nil/undef. *Type*: rvalue
*`defined_with_params`: Takes a resource reference and an optional hash of attributes. Returns 'true' if a resource with the specified attributes has already been added to the catalog. Returns 'false' otherwise.
*`delete_values`: Deletes all instances of a given value from a hash. For example, `delete_values({'a'=>'A','b'=>'B','c'=>'C','B'=>'D'}, 'B')` returns {'a'=>'A','c'=>'C','B'=>'D'} *Type*: rvalue
*`delete_undef_values`: Deletes all instances of the undef value from an array or hash. For example, `$hash = delete_undef_values({a=>'A', b=>'', c=>undef, d => false})` returns {a => 'A', b => '', d => false}. *Type*: rvalue
*`ensure_packages`: Takes a list of packages and only installs them if they don't already exist. It optionally takes a hash as a second parameter to be passed as the third argument to the `ensure_resource()` function. *Type*: statement
If the resource already exists, but does not match the specified parameters, this function attempts to recreate the resource, leading to a duplicate resource definition error.
*`flatten`: This function flattens any deeply nested arrays and returns a single flat array as a result. For example, `flatten(['a', ['b', ['c']]])` returns ['a','b','c']. *Type*: rvalue
*`grep`: This function searches through an array and returns any elements that match the provided regular expression. For example, `grep(['aaa','bbb','ccc','aaaddd'], 'aaa')` returns ['aaa','aaaddd']. *Type*: rvalue
*`has_ip_address`: Returns true if the client has the requested IP address on some interface. This function iterates through the `interfaces` fact and checks the `ipaddress_IFACE` facts, performing a simple string comparison. *Type*: rvalue
*`has_ip_network`: Returns true if the client has an IP address within the requested network. This function iterates through the 'interfaces' fact and checks the 'network_IFACE' facts, performing a simple string comparision. *Type*: rvalue
*`is_function_available`: This function accepts a string as an argument and determines whether the Puppet runtime has access to a function by that name. It returns 'true' if the function exists, 'false' if not. *Type*: rvalue
*`join_keys_to_values`: This function joins each key of a hash to that key's corresponding value with a separator. Keys and values are cast to strings. The return value is an array in which each element is one joined key/value pair. For example, `join_keys_to_values({'a'=>1,'b'=>2}, " is ")` results in ["a is 1","b is 2"]. *Type*: rvalue
*`member`: This function determines if a variable is a member of an array. The variable can be either a string, array, or fixnum. For example, `member(['a','b'], 'b')` and `member(['a','b','c'], ['b','c'])` return 'true', while `member(['a','b'], 'c')` and `member(['a','b','c'], ['c','d'])` return 'false'. *Type*: rvalue
*`num2bool`: This function converts a number or a string representation of a number into a true boolean. Zero or anything non-numeric becomes 'false'. Numbers greater than 0 become 'true'. *Type*: rvalue
*`pick`: From a list of values, returns the first value that is not undefined or an empty string. Takes any number of arguments, and raises an error if all values are undefined or empty.
*`prefix`: This function applies a prefix to all elements in an array. For example, `prefix(['a','b','c'], 'p')` returns ['pa','pb','pc']. *Type*: rvalue
*`private`: This function sets the current class or definition as private.
Calling the class or definition from outside the current module will fail. For example, `private()` called in class `foo::bar` outputs the following message if class is called from outside module `foo`:
*`range`: When given range in the form of '(start, stop)', `range` extrapolates a range as an array. For example, `range("0", "9")` returns [0,1,2,3,4,5,6,7,8,9]. Zero-padded strings are converted to integers automatically, so `range("00", "09")` returns [0,1,2,3,4,5,6,7,8,9].
*`reject`: This function searches through an array and rejects all elements that match the provided regular expression. For example, `reject(['aaa','bbb','ccc','aaaddd'], 'aaa')` returns ['bbb','ccc']. *Type*: rvalue
*`str2bool`: This converts a string to a boolean. This attempts to convert strings that contain values such as '1', 't', 'y', and 'yes' to 'true' and strings that contain values such as '0', 'f', 'n', and 'no' to 'false'. *Type*: rvalue
*`str2saltedsha512`: This converts a string to a salted-SHA512 password hash, used for OS X versions >= 10.7. Given any string, this function returns a hex version of a salted-SHA512 password hash, which can be inserted into your Puppet
manifests as a valid password attribute. *Type*: rvalue
*`strftime`: This function returns formatted time. For example, `strftime("%s")` returns the time since epoch, and `strftime("%Y=%m-%d")` returns the date. *Type*: rvalue
*`strip`: This function removes leading and trailing whitespace from a string or from every string inside an array. For example, `strip(" aaa ")` results in "aaa". *Type*: rvalue
*`suffix`: This function applies a suffix to all elements in an array. For example, `suffix(['a','b','c'], 'p')` returns ['ap','bp','cp']. *Type*: rvalue
*`type3x`: Returns a string description of the type when passed a value. Type can be a string, array, hash, float, integer, or boolean. This function will be removed when puppet 3 support is dropped and the new type system may be used. *Type*: rvalue
*`type_of`: Returns the literal type when passed a value. Requires the new
parser. Useful for comparison of types with `<=` such as in `if
type_of($some_value) <= Array[String] { ... }` (which is equivalent to `if
*`upcase`: Converts an object, array or hash of objects that respond to upcase to uppercase. For example, `upcase("abcd")` returns 'ABCD'. *Type*: rvalue
The following values will fail, causing compilation to abort:
```
validate_array(true)
validate_array('some_string')
$undefined = undef
validate_array($undefined)
```
*Type*: statement
*`validate_augeas`: Performs validation of a string using an Augeas lens.
The first argument of this function should be the 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 aborts with a parse error.
A third optional argument lists 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, to make sure your passwd content never contains user `foo`:
*`validate_cmd`: Performs 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 of the command if no % placeholder given). If the command, launched against a tempfile containing the passed string, returns a non-null value, compilation will abort with a parse error.
*`validate_re`: Performs simple validation of a string against one or more regular expressions. The first argument of this function should be the string to
*`validate_slength`: Validates that the first argument is a string (or an array of strings), and is less than or equal to the length of the second argument. It fails if the first argument is not a string or array of strings, or if arg 2 is not convertable to a number.
*`values_at`: Finds value inside an array based on location. The first argument is the array you want to analyze, and the second element can be a combination of:
*`zip`: Takes one element from first array and merges corresponding elements from second array. This generates a sequence of n-element arrays, where n is one more than the count of arguments. For example, `zip(['1','2','3'],['4','5','6'])` results in ["1", "4"], ["2", "5"], ["3", "6"]. *Type*: rvalue
As of Puppet Enterprise version 3.7, the stdlib module is no longer included in PE. PE users should install the most recent release of stdlib for compatibility with Puppet modules.
**stdlib 5.x**: When released, stdlib 5.x will drop support for Puppet 2.7.x. Please see [this discussion](https://github.com/puppetlabs/puppetlabs-stdlib/pull/176#issuecomment-30251414).
Puppet Labs modules on the Puppet Forge are open projects, and community contributions are essential for keeping them great. We can’t access the huge number of platforms and myriad of hardware, software, and deployment configurations that Puppet is intended to serve.
We want to keep it as easy as possible to contribute changes so that our modules work in your environment. There are a few guidelines that we need contributors to follow so that we can have a chance of keeping on top of things.
You can read the complete module contribution guide on the [Puppet Labs wiki](http://projects.puppetlabs.com/projects/module-site/wiki/Module_contributing).
