Add 7.4 - enter chroot environment

scripts/chapter7/7.4-enter-chroot.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+chroot "$LFS" /usr/bin/env -i   \
+    HOME=/root                  \
+    TERM="$TERM"                \
+    PS1='(lfs chroot) \u:\w\$ ' \
+    PATH=/usr/bin:/usr/sbin     \
+    /bin/bash --login
+
+

scripts/main.sh

@@ -420,3 +420,15 @@ then
 	stop_script "chapter7/7.3-prepare-virtual-fs.sh"
 fi
 
+# Chapter 7.4
+# ===========
+echo "Entering the Chroot Environment"
+su -c "bash $PWD/chapter7/7.4-enter-chroot.sh"
+
+# Exit on error
+check_exit_code
+if [ $exit_status -ne 0 ]
+then
+	stop_script "chapter7/7.4-enter-chroot.sh"
+fi
+