Undo changes which require further examination

Author: maresb

Diff for: base-notebook/start.sh

@@ -130,32 +130,8 @@ if [ "$(id -u)" == 0 ] ; then
     # Update potentially outdated environment variables since image build
     export XDG_CACHE_HOME=/home/$NB_USER/.cache
 
-    # Notes on how we ensure that the environment that this container is started
-    # with is preserved (except vars listen in JUPYTER_ENV_VARS_TO_UNSET) when
-    # we transition from running as root to running as NB_USER.
-    #
-    # - We use `sudo` to execute the command as NB_USER. What then
-    #   happens to the environment will be determined by configuration in
-    #   /etc/sudoers and /etc/sudoers.d/* as well as flags we pass to the sudo
-    #   command. The behavior can be inspected with `sudo -V` run as root.
-    #
-    #   ref: `man sudo`    https://linux.die.net/man/8/sudo
-    #   ref: `man sudoers` https://www.sudo.ws/man/1.8.15/sudoers.man.html
-    #
-    # - We use the `--preserve-env` flag to pass through most environment
-    #   variables, but understand that exceptions are caused by the sudoers
-    #   configuration: `env_delete`, `env_check`, and `secure_path`.
-    #
-    # - We use the `--set-home` flag to set the HOME variable appropriatly.
-    #
-    # - We reduce the `env_delete` list of default variables to be deleted. It
-    #   has higher priority than the `--preserve-env` flag and `env_keep`
-    #   configuration.
-    #
-    # - We disable the `secure_path` which is set by default in /etc/sudoers as
-    #   it would override the PATH variable.
-    echo 'Defaults !secure_path' > /etc/sudoers.d/added-by-start-script
-    echo 'Defaults env_delete -= "PATH LD_* PYTHON*"' >> /etc/sudoers.d/added-by-start-script
+    # Add ${CONDA_DIR}/bin to sudo secure_path
+    sed -r "s#Defaults\s+secure_path\s*=\s*\"?([^\"]+)\"?#Defaults secure_path=\"\1:${CONDA_DIR}/bin\"#" /etc/sudoers | grep secure_path > /etc/sudoers.d/path
 
     # Optionally grant passwordless sudo rights for the desired user
     if [[ "$GRANT_SUDO" == "1" || "$GRANT_SUDO" == 'yes' ]]; then
@@ -167,7 +143,10 @@ if [ "$(id -u)" == 0 ] ; then
     run-hooks /usr/local/bin/before-notebook.d
 
     echo "Running as ${NB_USER}:" "${cmd[@]}"
-    exec sudo --preserve-env --set-home --user "${NB_USER}" "${cmd[@]}"
+    exec sudo --preserve-env --set-home --user "${NB_USER}" \
+        PATH="${PATH}" XDG_CACHE_HOME="/home/${NB_USER}/.cache" \
+        PYTHONPATH="${PYTHONPATH:-}" \
+    "${cmd[@]}"
 
 # The container didn't start as the root user, so we will have to act as the
 # user we started as.