$ git clone -n https://src.fedoraproject.org/rpms/golang-github-quay-clair-3.git /var/lib/mock/f39-build-1915049-42889/root/chroot_tmpdir/scmroot/golang-github-quay-clair-3
Cloning into '/var/lib/mock/f39-build-1915049-42889/root/chroot_tmpdir/scmroot/golang-github-quay-clair-3'...
$ git fetch origin 1bde8219af549d8ace8c0b6e6414285602a10f7c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-quay-clair-3
 * [new ref]         1bde8219af549d8ace8c0b6e6414285602a10f7c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bde821 Fix FTBFS