$ git clone -n https://src.fedoraproject.org/rpms/jitterentropy.git /var/lib/mock/f41-build-side-1-3050287-37971/root/chroot_tmpdir/scmroot/jitterentropy
Cloning into '/var/lib/mock/f41-build-side-1-3050287-37971/root/chroot_tmpdir/scmroot/jitterentropy'...
$ git fetch origin b814ef798b5f015168bde5d45aede3f722c36f8f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jitterentropy
 * [new ref]         b814ef798b5f015168bde5d45aede3f722c36f8f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b814ef7 Update to the latest upstream v3.6.0