$ git clone -n https://src.fedoraproject.org/rpms/jackson-modules-base.git /var/lib/mock/f40-build-2664374-67052/root/chroot_tmpdir/scmroot/jackson-modules-base
Cloning into '/var/lib/mock/f40-build-2664374-67052/root/chroot_tmpdir/scmroot/jackson-modules-base'...
$ git fetch origin 7d17f8c2ea26a8fe6415fc2a59b31e906a2ffa8c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/jackson-modules-base
 * [new ref]         7d17f8c2ea26a8fe6415fc2a59b31e906a2ffa8c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7d17f8c Rebuilt for java-21-openjdk as system jdk