$ git clone -n https://src.fedoraproject.org/rpms/jackson-core.git /var/lib/mock/f38-build-side-42-init-devel-799561-28093/root/chroot_tmpdir/scmroot/jackson-core
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-799561-28093/root/chroot_tmpdir/scmroot/jackson-core'...
$ git fetch origin 9429a10cb048d5da329707f9eb9550fe4e9de5a2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jackson-core
 * [new ref]         9429a10cb048d5da329707f9eb9550fe4e9de5a2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9429a10 Update to version 2.14.2