go get -u github.com/kilianpaquier/filesystem@latestThe filesystem package exposes some useful function around files, for instance a simple function as func Exists(src) bool to verify a file existence easily.
It also exposes CopyFile(src, dst) error and CopyFileWithPerm(src, dst, perm) error which copy a given src file to dst with either specific permissions or not.
It also exposes CopyDir(srcdir, destdir) to copy a full directory at another place. The destination directory will be created if it doesn't already.
The package also exposes some constants around permissions.