$ git clone -n https://src.fedoraproject.org/rpms/gperftools.git /var/lib/mock/f40-build-791125-137120/root/chroot_tmpdir/scmroot/gperftools
Cloning into '/var/lib/mock/f40-build-791125-137120/root/chroot_tmpdir/scmroot/gperftools'...
$ git fetch origin 87c28c5423da62a3b9bc2bfaa07a879a7d2038f2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gperftools
 * [new ref]         87c28c5423da62a3b9bc2bfaa07a879a7d2038f2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 87c28c5 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild