$ git clone -n https://src.fedoraproject.org/rpms/R-ascii.git /var/lib/mock/f45-build-5969-345/root/chroot_tmpdir/scmroot/R-ascii
Cloning into '/var/lib/mock/f45-build-5969-345/root/chroot_tmpdir/scmroot/R-ascii'...
$ git fetch origin e66218ab08f18bea8ec462d78350d28928792d85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-ascii
 * [new ref]         e66218ab08f18bea8ec462d78350d28928792d85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e66218a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild