$ git clone -n https://src.fedoraproject.org/rpms/s2n-tls.git /var/lib/mock/f41-build-855864-167429/root/chroot_tmpdir/scmroot/s2n-tls
Cloning into '/var/lib/mock/f41-build-855864-167429/root/chroot_tmpdir/scmroot/s2n-tls'...
$ git fetch origin 737f6f02ef2e13cca9b86b1b33edec79bb6b1616:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/s2n-tls
 * [new ref]         737f6f02ef2e13cca9b86b1b33edec79bb6b1616 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 737f6f0 fix: Resolve reference for rhbz#2304838, rhbz#2304837, rhbz#2304681 added