$ git clone -n https://src.fedoraproject.org/rpms/R-Cairo.git /var/lib/mock/f42-build-861930-170512/root/chroot_tmpdir/scmroot/R-Cairo
Cloning into '/var/lib/mock/f42-build-861930-170512/root/chroot_tmpdir/scmroot/R-Cairo'...
$ git fetch origin 890ae4f41cdb03d1d2f5a4da11933013363efb3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-Cairo
 * [new ref]         890ae4f41cdb03d1d2f5a4da11933013363efb3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 890ae4f Rebuild for ICU 76