$ git clone -n https://src.fedoraproject.org/rpms/python-pyasn1.git /var/lib/mock/f39-build-1948983-43206/root/chroot_tmpdir/scmroot/python-pyasn1
Cloning into '/var/lib/mock/f39-build-1948983-43206/root/chroot_tmpdir/scmroot/python-pyasn1'...
$ git fetch origin 0e1cab7900f61f6f565874b506e1bfbf167cf562:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-pyasn1
 * [new ref]         0e1cab7900f61f6f565874b506e1bfbf167cf562 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0e1cab7 Update to 0.5.1