$ git clone -n https://src.fedoraproject.org/rpms/R-rappdirs.git /var/lib/mock/f45-build-6364-348/root/chroot_tmpdir/scmroot/R-rappdirs
Cloning into '/var/lib/mock/f45-build-6364-348/root/chroot_tmpdir/scmroot/R-rappdirs'...
$ git fetch origin 0826d5da181e647c97a9d446fcef35700c555ba6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-rappdirs
 * [new ref]         0826d5da181e647c97a9d446fcef35700c555ba6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0826d5d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild