$ git clone -n https://src.fedoraproject.org/rpms/mozjs102.git /var/lib/mock/f41-build-1303043-23490/root/chroot_tmpdir/scmroot/mozjs102
Cloning into '/var/lib/mock/f41-build-1303043-23490/root/chroot_tmpdir/scmroot/mozjs102'...
$ git fetch origin 080ef728e4e50e972c7dcfb91d759cf349b4f715:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mozjs102
 * [new ref]         080ef728e4e50e972c7dcfb91d759cf349b4f715 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 080ef72 Ignore more failures...