Permissions for global NPM packages

Author: chrmarti

src/javascript-node/Dockerfile

@@ -4,8 +4,19 @@ FROM node:${VARIANT}
 
 ARG USERNAME=node
 
-# Install eslint
-RUN su ${USERNAME} -c "umask 0002 && npm install -g eslint" \
+RUN \
+    # Configure global npm install location, use group to adapt to UID/GID changes
+    if ! cat /etc/group | grep -e "^npm:" > /dev/null 2>&1; then groupadd -r npm; fi \
+    && usermod -a -G npm ${USERNAME} \
+    && umask 0002 \
+    && mkdir -p ${NPM_GLOBAL} \
+    && touch /usr/local/etc/npmrc \
+    && chown ${USERNAME}:npm ${NPM_GLOBAL} /usr/local/etc/npmrc \
+    && chmod g+s ${NPM_GLOBAL} \
+    && npm config -g set prefix ${NPM_GLOBAL} \
+    && sudo -u ${USERNAME} npm config -g set prefix ${NPM_GLOBAL} \
+    # Install eslint
+    && su ${USERNAME} -c "umask 0002 && npm install -g eslint" \
     && npm cache clean --force > /dev/null 2>&1
 
 # [Optional] Uncomment this section to install additional OS packages.