$ git clone -n https://src.fedoraproject.org/rpms/swift-lang.git /var/lib/mock/f33-build-372172-61405/root/chroot_tmpdir/scmroot/swift-lang
Cloning into '/var/lib/mock/f33-build-372172-61405/root/chroot_tmpdir/scmroot/swift-lang'...
$ git reset --hard 5401212c883d688d74db0accc0156873794288a6
HEAD is now at 5401212 Updated to swift-5.3.1-RELEASE