tuto3: various fixes to help students

pkg/debian-tuto2/Dockerfile

@@ -19,7 +19,8 @@ RUN echo "deb http://deb.debian.org/debian buster-backports main" >> /etc/apt/so
     udev \
     vim.tiny \
     wireguard-tools \
-  && rm -rf /var/lib/apt/lists/*
+  && rm -rf /var/lib/apt/lists/* \
+  && rm -rf /etc/ssh/ssh_host_*_key*
 
 RUN rm -rf /etc/init.d/ && \
     mkdir /overlay && \

pkg/debian-tuto3/Dockerfile

@@ -19,6 +19,7 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
     tcpdump \
     udev \
     vim.tiny \
-  && rm -rf /var/lib/apt/lists/*
+  && rm -rf /var/lib/apt/lists/* \
+  && rm -rf /etc/ssh/ssh_host_*_key*
 
 COPY sshd_config /etc/ssh/sshd_config

pkg/tinydeb/Dockerfile

@@ -8,7 +8,8 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
     python-apt \
     systemd-sysv \
     vim.tiny \
-  && rm -rf /var/lib/apt/lists/*
+  && rm -rf /var/lib/apt/lists/* \
+  && rm -rf /etc/ssh/ssh_host_*_key*
 
 COPY gai.conf /etc/gai.conf
 COPY sshd_config /etc/ssh/sshd_config

pkg/wg/ask.sh

@@ -12,7 +12,7 @@ cmdline() {
 [ -f "/var/lib/adlin/wireguard/adlin.token" ] && WGTOKEN=$(cat /var/lib/adlin/wireguard/adlin.token)
 [ -z "${WGTOKEN}" ] && WGTOKEN=$(cmdline adlin.token)
 [ -z "${WGTOKEN}" ] && {
-    echo -n "You didn't define your token to connect the network. Please copy it into /var/lib/adlin/wireguard/adlin.token and reboot."
+    echo "You didn't define your token to connect the network. Please run here `join-p0m` and then reboot."
     exit 1
 }
 [ -f "/var/lib/adlin/wireguard/adlin.conf" ] && WGPRVKEY=$(sed 's/^.*PrivateKey *= *//p;d' /var/lib/adlin/wireguard/adlin.conf)