Fix indentation for interface definition in module.yml

Fixed typo

README.md

@@ -1,6 +1,6 @@
 # Example Dojo
 
-This repositories features an example dojo.
+This repository features an example dojo.
 
 The dojo is defined by [dojo.yml](./dojo.yml).
 
@@ -84,7 +84,7 @@ When `/bin/sh` (which is linked to `/bin/dash`) is run under this, it will immed
 This means that both the **effective** and **real** user will be `hacker`, and the flag will not be accessible.
 This affects `system`, which ultimately just runs `/bin/sh`.
 
-The challenge can rememedy this by explicitly setting the **real** user to the **effective** user:
+The challenge can remedy this by explicitly setting the **real** user to the **effective** user:
 ```c
 setreuid(geteuid(), -1)
 ```

demo/desktop-auto-launch/.init

@@ -4,16 +4,25 @@ PATH="/run/dojo/bin:$PATH"
 USER="hacker"
 
 xfce_env() {
-  local session_pid
+    local session_pid
-  session_pid=$(pgrep -u "$USER" xfce4-session | head -n1)
+    session_pid=$(pgrep -u "$USER" xfce4-session | head -n1)
-  xargs -0 -a /proc/"$session_pid"/environ
+    xargs -0 -a /proc/"$session_pid"/environ
 }
 
 xfce_run() {
-  setsid su "$USER" -c "env - $(xfce_env) $*"
+    id
+    which su
+    echo "$USER"
+    setsid runuser "$USER" -c "env - $(xfce_env) $*"
 }
 
-# Consider using `--geometry` to set the window size and position
+# Launch a background process that waits for xfce4-session and then runs the command.
-# Consider using `--fullscreen` to launch the application in fullscreen mode
+(
+    while ! pgrep -u "$USER" xfce4-session > /dev/null; do
+        sleep 1
+    done
 
-xfce_run exo-open --launch TerminalEmulator
+    # Consider using `--geometry` to set the window size and position
+    # Consider using `--fullscreen` to launch the application in fullscreen mode
+    xfce_run exo-open --launch TerminalEmulator
+) &

demo/desktop-auto-launch/DESCRIPTION.md

@@ -0,0 +1 @@
+This challenge demonstrates how to automatically launch a desktop application after the desktop starts.

dojo.yml

@@ -8,3 +8,4 @@ modules:
   - id: hello
   - id: world
   - id: demo
+  - id: lectures

lectures/DESCRIPTION.md

@@ -0,0 +1 @@
+This module showcases two styles of embedded lectures that pwn.college supports: graded and non-graded.

lectures/graded-lecture/.config

@@ -0,0 +1 @@
+hh4XAU6XYP0 549

lectures/module.yml

@@ -0,0 +1,19 @@
+name: Lectures
+resources:
+  - name: Ungraded Lecture
+    type: lecture
+    video: hh4XAU6XYP0
+    slides: 14ZJRIyf0HnoYO1N8GI5ygE-ZVgdhjJrvzkETFLz7NIo
+  - id: graded-lecture
+    type: challenge
+    name: Graded Lecture
+    description: |
+      Lectures can be graded by embedding them as challenges!
+      This is a demonstration of this capability.
+
+      Graded lectures are actually custom challenges with a custom interface.
+      The challenge runs a special docker container, and the way to configure it is to include a .config file containing the youtube ID for the video and the duration in seconds that must be watched before the flag is given.
+    image: pwncollege/challenge-lecture
+    interfaces:
+      - name: Challenge
+        port: 80