$ git clone -n https://src.fedoraproject.org/rpms/R-pkgbuild.git /var/lib/mock/f38-build-side-42-init-devel-755179-27676/root/chroot_tmpdir/scmroot/R-pkgbuild
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-755179-27676/root/chroot_tmpdir/scmroot/R-pkgbuild'...
$ git fetch origin 4b15bef11c60054355ccb9d1d0430b140b0b8aaf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pkgbuild
 * [new ref]         4b15bef11c60054355ccb9d1d0430b140b0b8aaf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b15bef Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild