$ git clone -n https://src.fedoraproject.org/rpms/sundials.git /var/lib/mock/f42-build-864965-172682/root/chroot_tmpdir/scmroot/sundials
Cloning into '/var/lib/mock/f42-build-864965-172682/root/chroot_tmpdir/scmroot/sundials'...
$ git fetch origin 245e583be7fcfcc55aac5d9add16d15cec7af1d0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sundials
 * [new ref]         245e583be7fcfcc55aac5d9add16d15cec7af1d0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 245e583 Install sundials_futils.h file