From 7e7f4e90b0de9504094e68de6cd7e56dde4c7b95 Mon Sep 17 00:00:00 2001
From: accetto <34798830+accetto@users.noreply.github.com>
Date: Sun, 16 Apr 2023 12:18:59 +0200
Subject: [PATCH] added HINTS comment to Dockerfile.extend example

---
 examples/Dockerfile.extend | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/examples/Dockerfile.extend b/examples/Dockerfile.extend
index 185238a..fe8d2c9 100644
--- a/examples/Dockerfile.extend
+++ b/examples/Dockerfile.extend
@@ -2,6 +2,17 @@
 
 ### This is an example of extending the images.
 
+### HINTS
+### Sometimes you can get building errors related to cache handling.
+### One of the following usually helps:
+### (1) Use the '--no-cache' option
+###     > docker build ... --no-cache
+### (2) Purge the builder cache before and/or between builds
+###     > docker builder prune
+### (3) Re-open the terminal and/or Visual Studio Code
+### (4) Remove the line containing 'rm -rf /var/lib/apt/lists/*'
+###     from your extending Dockerfile (like this one)
+
 ### choose a base image and tag
 ARG BASEIMAGE="accetto/debian-vnc-xfce-g3"
 # ARG BASEIMAGE="accetto/debian-vnc-xfce-chromium-g3"