Boost doesn't set correct permissions for recursive directories

Boost uses mkdir() with the $recursive flag set to TRUE, which allows to create new directory along with all its needed parents if they do not exists.

After, Boost calls drupal_chmod() on the directory, meaning the deepest one. So it is likely that parents directories won't have the proper permission, leading to a fail of the drupal_chmod() on that very deepest directory. Example:

The URL you request is something like: foo.com/bar/zoo/dummy/path

Boost might create a path like: cache/normal/foo.com/bar/zoo/dummy

Then Boost will try to chmod: cache/normal/foo.com/bar/zoo/dummy

Which might fail because it forgot to chmod those first:

cache
cache/normal
cache/normal/foo.com
cache/normal/foo.com/bar
cache/normal/foo.com/bar/zoo

The problem with this, is that depending on your filesystem configuration, Boost might not be able to clear the cache directory ; leaving expired HTML files in the cache directory.

Patch following.

Cheers