tokuhirom/plenv — pull request #70 by dave-miles (2014-09-17 16:28:39+00:00)
Title: Only rehash cpanm if required

Created to avoid [lock file](https://github.com/tokuhirom/plenv/blob/master/libexec/plenv-rehash#L21) contention when running multiple instances of cpanm for invocations that don't need to rehash..