$ git clone -n https://src.fedoraproject.org/rpms/libkeepalive.git /var/lib/mock/f45-build-16427-486/root/chroot_tmpdir/scmroot/libkeepalive
Cloning into '/var/lib/mock/f45-build-16427-486/root/chroot_tmpdir/scmroot/libkeepalive'...
$ git fetch origin c68dce988129d4da458735c65df63ac9ff2885c5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libkeepalive
 * [new ref]         c68dce988129d4da458735c65df63ac9ff2885c5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c68dce9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild