$ git clone -n https://src.fedoraproject.org/rpms/golang-x-crypto.git /var/lib/mock/f40-build-2199041-51719/root/chroot_tmpdir/scmroot/golang-x-crypto
Cloning into '/var/lib/mock/f40-build-2199041-51719/root/chroot_tmpdir/scmroot/golang-x-crypto'...
$ git fetch origin 53cf87f147bb0fc059b0378478e987020bb24f93:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-x-crypto
 * [new ref]         53cf87f147bb0fc059b0378478e987020bb24f93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 53cf87f update to v0.17.0, close rhbz#2255153