$ git clone -n https://src.fedoraproject.org/rpms/R-rvest.git /var/lib/mock/f45-build-6376-348/root/chroot_tmpdir/scmroot/R-rvest
Cloning into '/var/lib/mock/f45-build-6376-348/root/chroot_tmpdir/scmroot/R-rvest'...
$ git fetch origin ce0a5ec8f69074e68d1515de485bd73dcb3737f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rvest
 * [new ref]         ce0a5ec8f69074e68d1515de485bd73dcb3737f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ce0a5ec Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild