add prepare home script to setup link for authorized keys

Dockerfile

@@ -45,6 +45,7 @@ RUN usermod -s /bin/zsh developer
 RUN adduser developer shadow
 
 COPY ./Entrypoint.sh /usr/local/bin/entrypoint.sh
+COPY ./PrepareHome.sh /usr/local/bin/prepare_home.sh
 EXPOSE 3022/tcp
 USER developer
 ENTRYPOINT [ "/usr/local/bin/entrypoint.sh" ]

Entrypoint.sh

@@ -12,4 +12,8 @@ touch /etc/dropbear/authorized_keys
 chmod 600 /etc/dropbear/authorized_keys 
 sudo chown -R developer:developer /home/developer
 
+# setup home directory links/permissions etc
+# this occurs on every container startup and is meant to be idempotent without overwriting existing files
+/usr/local/bin/prepare_home.sh
+
 exec dropbear -R -w -F -E -p 3022 -P /var/run/dropbear.pid

PrepareHome.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# ensure ~/.ssh exists
+mkdir -p ~/.ssh
+
+# create link to drop bear authorized keys
+if [ -e ~/.ssh/authorized_keys ] ; then
+  echo "Authorized keys already exists, skipping..."
+else
+  echo "Creating authorized_keys link..."
+  ln -s /etc/dropbear/authorized_keys ~/.ssh/authorized_keys
+fi