unpack-trees: add a note about path invalidation

diff --git a/ci/run-linux32-docker.sh b/ci/run-linux32-docker.sh
index 0edf63acfafb77a061cde1225ae3543173a37cd7..21637903ce0790b1689907f64cca302b32285028 100755 (executable)
--- a/ci/run-linux32-docker.sh
+++ b/ci/run-linux32-docker.sh
@@ -9,7 +9,9 @@ docker pull daald/ubuntu32:xenial
 
 # Use the following command to debug the docker build locally:
 # $ docker run -itv "${PWD}:/usr/src/git" --entrypoint /bin/bash daald/ubuntu32:xenial
-# root@container:/# /usr/src/git/ci/run-linux32-build.sh
+# root@container:/# /usr/src/git/ci/run-linux32-build.sh <host-user-id>
+
+container_cache_dir=/tmp/travis-cache
 
 docker run \
        --interactive \
@@ -18,6 +20,12 @@ docker run \
        --env GIT_PROVE_OPTS \
        --env GIT_TEST_OPTS \
        --env GIT_TEST_CLONE_2GB \
+       --env cache_dir="$container_cache_dir" \
        --volume "${PWD}:/usr/src/git" \
+       --volume "$cache_dir:$container_cache_dir" \
        daald/ubuntu32:xenial \
        /usr/src/git/ci/run-linux32-build.sh $(id -u $USER)
+
+check_unignored_build_artifacts
+
+save_good_tree