$ git clone -n https://src.fedoraproject.org/rpms/R-mnormt.git /var/lib/mock/f45-build-6237-347/root/chroot_tmpdir/scmroot/R-mnormt
Cloning into '/var/lib/mock/f45-build-6237-347/root/chroot_tmpdir/scmroot/R-mnormt'...
$ git fetch origin 79cfa29f5169b6b1e0d2508adb68b4fd66c0aae3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-mnormt
 * [new ref]         79cfa29f5169b6b1e0d2508adb68b4fd66c0aae3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79cfa29 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild