$ git clone -n https://src.fedoraproject.org/rpms/tlog.git /var/lib/mock/f42-build-3426606-45197/root/chroot_tmpdir/scmroot/tlog
Cloning into '/var/lib/mock/f42-build-3426606-45197/root/chroot_tmpdir/scmroot/tlog'...
$ git fetch origin a024c17121167b295b7e9eb898dcb0ed9ee7bb09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tlog
 * [new ref]         a024c17121167b295b7e9eb898dcb0ed9ee7bb09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a024c17 Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2341444