sculpin/sculpin — pull request #170 by hackzilla (2014-10-04 09:38:04+00:00)
Title: check directory is writeable after checking it exists

```
sculpin cache:clear

[RuntimeException]
Unable to write in the "/path/to/project/app/cache/dev" directory

cache:clear
```

If you create the directory ```app/cache/dev``` then it'll run without error, and remove the directory and cause the error on the next run.