cmd-fetch: pass --force-nocache
If the cache was nuked, we should re-download everything even if
nothing changed since the last build. Otherwise, it's impossible to do a
`cosa build --force` afterwards.
@@ -115,8 +115,10 @@ fi
# shellcheck disable=SC2086
prepare_compose_overlays ${IGNORE_COSA_OVERRIDES_ARG}
+# Use --force-nocache to ensure we always download packages, regardless of
+# whether the package set didn't changed since the last build.
# shellcheck disable=SC2086
-runcompose_tree --download-only ${args}
+runcompose_tree --download-only ${args} --force-nocache
# This stamp file signifies we successfully fetched once; it's
# validated in cmd-build.
touch "${fetch_stamp}"
