$ git clone -n https://src.fedoraproject.org/rpms/jackson-core.git /var/lib/mock/f41-build-1273186-23132/root/chroot_tmpdir/scmroot/jackson-core
Cloning into '/var/lib/mock/f41-build-1273186-23132/root/chroot_tmpdir/scmroot/jackson-core'...
$ git fetch origin bde08696323c6378357300957362064d049a4220:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jackson-core
 * [new ref]         bde08696323c6378357300957362064d049a4220 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bde0869 Add extra fix to the patch