$ git clone -n https://src.fedoraproject.org/rpms/R-Cairo.git /var/lib/mock/f45-build-5887-345/root/chroot_tmpdir/scmroot/R-Cairo
Cloning into '/var/lib/mock/f45-build-5887-345/root/chroot_tmpdir/scmroot/R-Cairo'...
$ git fetch origin 48534148765884061df41426960e694f6b30dc0e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-Cairo
 * [new ref]         48534148765884061df41426960e694f6b30dc0e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4853414 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild