Supply defaults in case of unconfigured apt

Author: pillarsdotnet

templates/update_had_no_effect.sh.epp

@@ -3,10 +3,10 @@
   Integer $timeout = 30,
   Integer $tries = 1,
 | -%>
-eval "$(apt-config shell DIR Dir::Cache)"
+eval "$(apt-config shell DIR Dir::Cache || echo "DIR='var/cache/apt'")"
 cd "/$DIR" || exit 0
 OLD="$(mktemp -p "/$DIR")"
-eval "$(apt-config shell CUR Dir::Cache::pkgcache)"
+eval "$(apt-config shell CUR Dir::Cache::pkgcache || echo "CUR='pkgcache.bin'")"
 ln -f "$CUR" "$OLD"
 TRIES=<%= $tries %>
 while true; do