$ git clone -n https://src.fedoraproject.org/rpms/corkscrew.git /var/lib/mock/f45-build-5853-342/root/chroot_tmpdir/scmroot/corkscrew
Cloning into '/var/lib/mock/f45-build-5853-342/root/chroot_tmpdir/scmroot/corkscrew'...
$ git fetch origin 3c7a3bb2c40f43726bc4ce47f723378469c561f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/corkscrew
 * [new ref]         3c7a3bb2c40f43726bc4ce47f723378469c561f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c7a3bb Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild