$ git clone -n https://src.fedoraproject.org/rpms/gperftools.git /var/lib/mock/f45-build-12917-444/root/chroot_tmpdir/scmroot/gperftools
Cloning into '/var/lib/mock/f45-build-12917-444/root/chroot_tmpdir/scmroot/gperftools'...
$ git fetch origin d01ec036f455a099cbce078f68e65d9e505b4d4d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gperftools
 * [new ref]         d01ec036f455a099cbce078f68e65d9e505b4d4d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d01ec03 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild