$ git clone -n https://src.fedoraproject.org/rpms/g2clib.git /var/lib/mock/f45-build-9385-403/root/chroot_tmpdir/scmroot/g2clib
Cloning into '/var/lib/mock/f45-build-9385-403/root/chroot_tmpdir/scmroot/g2clib'...
$ git fetch origin 86461b14d1f21887662571873f2385dce27ab64c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g2clib
 * [new ref]         86461b14d1f21887662571873f2385dce27ab64c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86461b1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild