$ git clone -n https://src.fedoraproject.org/rpms/libxslt.git /var/lib/mock/f40-build-1178821-21861/root/chroot_tmpdir/scmroot/libxslt
Cloning into '/var/lib/mock/f40-build-1178821-21861/root/chroot_tmpdir/scmroot/libxslt'...
$ git fetch origin e12d13e81b85b0c506df94414d38cfbacddb7dbc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libxslt
 * [new ref]         e12d13e81b85b0c506df94414d38cfbacddb7dbc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e12d13e Patch for plugin errors