$ git clone -n https://src.fedoraproject.org/rpms/antlr4-project.git /var/lib/mock/f39-build-2283369-55585/root/chroot_tmpdir/scmroot/antlr4-project
Cloning into '/var/lib/mock/f39-build-2283369-55585/root/chroot_tmpdir/scmroot/antlr4-project'...
$ git fetch origin bef195dca23939ad4a90f62724160130ef526ec3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/antlr4-project
 * [new ref]         bef195dca23939ad4a90f62724160130ef526ec3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bef195d Remove maven-clean-plugin BR