$ git clone -n https://src.fedoraproject.org/rpms/libmacaroons.git /var/lib/mock/f45-build-16525-487/root/chroot_tmpdir/scmroot/libmacaroons
Cloning into '/var/lib/mock/f45-build-16525-487/root/chroot_tmpdir/scmroot/libmacaroons'...
$ git fetch origin 57e5d0367a520edc3a2475f99d2afdbe77fc5aa5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libmacaroons
 * [new ref]         57e5d0367a520edc3a2475f99d2afdbe77fc5aa5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 57e5d03 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild