fixed few minor issues

lib/chroot.sh

@@ -32,7 +32,9 @@ chroot_bootstrap()
     cp -av $bootstrap_items $tmpdir
 
     prnt I "Changing root and starting a fork of init.sh..."
-    chroot $CHROOT_PATH /bin/bash -c 'CHROOT_DONE=true; $tmpdir/init.sh $@'
+    # on the following line, true allows to correctly exit in case of error since
+    # errors are managed by the chrooted environment
+    chroot $CHROOT_PATH /bin/bash -c 'CHROOT_DONE=true; $tmpdir/init.sh $@' || true
 
     # If stage file still exists we copy it to be able to resume later
     if [[ -e $tmpdir/$(basename $STAGE_FILE) ]]; then