$ git clone -n https://src.fedoraproject.org/forks/packit/rpms/jackson-core.git /var/lib/mock/f43-build-59083521-6570956/root/chroot_tmpdir/scmroot/jackson-core
Cloning into '/var/lib/mock/f43-build-59083521-6570956/root/chroot_tmpdir/scmroot/jackson-core'...
$ git fetch origin e546146614565c6867bc7818de5b35eb102b6158:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/forks/packit/rpms/jackson-core
 * [new ref]         e546146614565c6867bc7818de5b35eb102b6158 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e546146 Update to 2.19.0 upstream release