$ git clone -n https://src.fedoraproject.org/rpms/R-rstudioapi.git /var/lib/mock/f45-build-6393-348/root/chroot_tmpdir/scmroot/R-rstudioapi
Cloning into '/var/lib/mock/f45-build-6393-348/root/chroot_tmpdir/scmroot/R-rstudioapi'...
$ git fetch origin de531d381418cc4df395d49758c9e9a559bce88c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rstudioapi
 * [new ref]         de531d381418cc4df395d49758c9e9a559bce88c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de531d3 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild