$ git clone -n https://src.fedoraproject.org/rpms/makedumpfile.git /var/lib/mock/f45-build-17965-506/root/chroot_tmpdir/scmroot/makedumpfile
Cloning into '/var/lib/mock/f45-build-17965-506/root/chroot_tmpdir/scmroot/makedumpfile'...
$ git fetch origin 25af2b713e5c4e927076f06f118e1c3544fdd6c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/makedumpfile
 * [new ref]         25af2b713e5c4e927076f06f118e1c3544fdd6c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25af2b7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild