$ git clone -n https://src.fedoraproject.org/rpms/R-expm.git /var/lib/mock/f39-build-1470494-33899/root/chroot_tmpdir/scmroot/R-expm
Cloning into '/var/lib/mock/f39-build-1470494-33899/root/chroot_tmpdir/scmroot/R-expm'...
$ git fetch origin b1b7de6c5cf0eb8584db5beee700bf243975beb4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-expm
 * [new ref]         b1b7de6c5cf0eb8584db5beee700bf243975beb4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b1b7de6 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild