AbsFilePath resolves ENV vars specified in string for file paths.

CopyDir is a utility to assist with copying a directory from src to dest.

CopyFile is a utility to assist with copying a file from src to dest.

Gopath will return the current GOPATH as set by environment variables and will fall back to ~/go if a GOPATH is not set.

UntarBundle will untar a source tar.gz archive to the supplied destination.

DirMode is the default permission used when creating directories.

FileMode is the default permission used when creating files.