$ git clone -n https://src.fedoraproject.org/rpms/R-Rmpfr.git /var/lib/mock/f41-build-821747-152620/root/chroot_tmpdir/scmroot/R-Rmpfr
Cloning into '/var/lib/mock/f41-build-821747-152620/root/chroot_tmpdir/scmroot/R-Rmpfr'...
$ git fetch origin f2b756cf983e5c6d7d2933e4f6826f0beb86cd06:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-Rmpfr
 * [new ref]         f2b756cf983e5c6d7d2933e4f6826f0beb86cd06 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2b756c Rebuilt for https://fedoraproject.org/wiki/Fedora_41_Mass_Rebuild