$ git clone -n https://src.fedoraproject.org/rpms/jitterentropy.git /var/lib/mock/f41-build-785999-13590/root/chroot_tmpdir/scmroot/jitterentropy
Cloning into '/var/lib/mock/f41-build-785999-13590/root/chroot_tmpdir/scmroot/jitterentropy'...
$ git fetch origin de5258cdb3b276c04b2196126895725f05f9aca9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jitterentropy
 * [new ref]         de5258cdb3b276c04b2196126895725f05f9aca9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at de5258c Fix a changelog entry