$ git clone -n https://src.fedoraproject.org/rpms/TeXmacs.git /var/lib/mock/f40-build-751257-116130/root/chroot_tmpdir/scmroot/TeXmacs
Cloning into '/var/lib/mock/f40-build-751257-116130/root/chroot_tmpdir/scmroot/TeXmacs'...
$ git fetch origin 862e7c64dd5a23336a5a80c5e3e1464481bada54:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/TeXmacs
 * [new ref]         862e7c64dd5a23336a5a80c5e3e1464481bada54 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 862e7c6 Use %{py3_shebang_fix}