$ git clone -n https://src.fedoraproject.org/rpms/R-profmem.git /var/lib/mock/f45-build-6345-348/root/chroot_tmpdir/scmroot/R-profmem
Cloning into '/var/lib/mock/f45-build-6345-348/root/chroot_tmpdir/scmroot/R-profmem'...
$ git fetch origin b02d96971903c31eaf2c10bd3fd9a292c23d8544:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-profmem
 * [new ref]         b02d96971903c31eaf2c10bd3fd9a292c23d8544 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b02d969 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild