# Crontab Resource

Implements a resource that reports new versions when the current time
matches the crontab expression

## Source Configuration

* `expression`: *Required.* The crontab expression:

    field         allowed values
    -----         --------------
    minute        0-59
    hour          0-23
    day of month  1-31
    month         1-12 (or names, see below)
    day of week   0-7 (0 or 7 is Sun, or use names)

  e.g.

    0 23 * * 1-5 # Run at 11:00pm from Monday to Friday

* `location`: *Optional.* Defaults to UTC. Accepts any timezone that
  can be parsed by https://godoc.org/time#LoadLocation

  e.g.

     America/New_York
     America/Vancouver

## Behavior

### `check`: Report the current time.

Returns a new version only if the current minute matches the crontab
expression and no version was previously returned during the current
minute.

#### Parameters

*None.*

### `in`: Report the given time

If triggered by `check`, returns the original version as the resulting
version.

#### Parameters

1. *Output directory.* The directory where the in script will store
   the requested version

### `out`: Not implemented.

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Signed-off-by: John_Shahid <7c84c4d4148af24079897a92115d562877358578@pivotal.io>
