$ git clone -n https://src.fedoraproject.org/rpms/libunibreak.git /var/lib/mock/f45-build-17168-496/root/chroot_tmpdir/scmroot/libunibreak
Cloning into '/var/lib/mock/f45-build-17168-496/root/chroot_tmpdir/scmroot/libunibreak'...
$ git fetch origin 38e74831245f1239c9810f057cc2e2421bbd8543:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libunibreak
 * [new ref]         38e74831245f1239c9810f057cc2e2421bbd8543 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38e7483 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild