$ git clone -n https://src.fedoraproject.org/rpms/swift-lang.git /var/lib/mock/f33-build-156106-43387/root/chroot_tmpdir/scmroot/swift-lang
Cloning into '/var/lib/mock/f33-build-156106-43387/root/chroot_tmpdir/scmroot/swift-lang'...
$ git reset --hard 54d3381aa190de5a5a36ea05018bccbf3982c81b
HEAD is now at 54d3381 Update to Swift 5.1.5