$ git clone -n https://src.fedoraproject.org/rpms/visualboyadvance-m.git /var/lib/mock/f39-build-1490773-34511/root/chroot_tmpdir/scmroot/visualboyadvance-m
Cloning into '/var/lib/mock/f39-build-1490773-34511/root/chroot_tmpdir/scmroot/visualboyadvance-m'...
$ git fetch origin c28e2f68629c75dd05fe6827fdcceefbc2048964:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/visualboyadvance-m
 * [new ref]         c28e2f68629c75dd05fe6827fdcceefbc2048964 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c28e2f6 Update to 2.1.7