$ git clone -n https://src.fedoraproject.org/rpms/x509viewer.git /var/lib/mock/f45-build-38582-725/root/chroot_tmpdir/scmroot/x509viewer
Cloning into '/var/lib/mock/f45-build-38582-725/root/chroot_tmpdir/scmroot/x509viewer'...
$ git fetch origin 5ad195cb4230296ccc81347d08af42f60d9ee4a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/x509viewer
 * [new ref]         5ad195cb4230296ccc81347d08af42f60d9ee4a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5ad195c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild