$ git clone -n https://src.fedoraproject.org/rpms/bzip2.git /var/lib/mock/f40-build-730428-103400/root/chroot_tmpdir/scmroot/bzip2
Cloning into '/var/lib/mock/f40-build-730428-103400/root/chroot_tmpdir/scmroot/bzip2'...
$ git fetch origin e28f241622fb830c03a8dc36f862cd641113fc58:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/bzip2
 * [new ref]         e28f241622fb830c03a8dc36f862cd641113fc58 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e28f241 Fix: forgot to increment the release in the previous commit