$ git clone -n https://src.fedoraproject.org/rpms/tortoisehg.git /var/lib/mock/f41-build-side-1-2771450-32231/root/chroot_tmpdir/scmroot/tortoisehg
Cloning into '/var/lib/mock/f41-build-side-1-2771450-32231/root/chroot_tmpdir/scmroot/tortoisehg'...
$ git fetch origin b54e0446bc5217e962925d6391a430b6228de8fb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tortoisehg
 * [new ref]         b54e0446bc5217e962925d6391a430b6228de8fb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b54e044 Add explicit dependency to python3-wheel with bdist_wheel