added sketch sample, formatting

releng/releng_check_isocontent

@@ -2,10 +2,17 @@
 
 set -e
 
-printf "NOT COMPLETED YET\n"
+START_DIR_DONT_CHANGE=`pwd`
 
+# required config items
+XOR=""
+DIR=""
+IMG=""
+
+printf "\n$0: SCRIPT NOT COMPLETED YET\n"
 exit 100
 
+
 # Thomas:
 # xorriso provides built-in means for comparison: 
 #  -compare_r disk_path iso_rr_path
@@ -30,4 +37,53 @@ exit 100
 # xorriso -indev my.iso -find /   vs. find input_dir
 # bsdtar -xf my.iso               vs. input_dir
 
+
+Sketched by Thomas:
+------------------------------------------------------------------------------
+
+  image_file=/tmp/...
+  on_disk=...
+  in_iso="$on_disk"
+  copy_on_disk=/tmp/...
+
+  if test -e "$image_file"
+  then
+    echo "TEST ENVIRONMENT ERROR: Existing image_file target:" >&2
+    ls -ld "$image_file" >&2
+    exit 1
+  fi
+  if test -e "$copy_on_disk"
+  then
+    echo "TEST ENVIRONMENT ERROR: Existing copy_on_disk target:" >&2
+    ls -ld "$copy_on_disk" >&2
+    exit 1
+  fi
+
+  # Produce simple image
+  xorriso \
+    -for_backup \
+    -outdev "$image_file" \
+    -map "$on_disk" "$in_iso"
+
+  # Copy from image to temporary disk tree
+  xorriso \
+    -for_backup \
+    -indev "$image_file" \
+    -osirrox on \
+    -extract "$in_iso" "$copy_on_disk"
+
+  # Compare original disk tree and temporary one
+  diff -r "$on_disk" "$copy_on_disk"
+  if test "$?" -ne 0
+  then
+    echo 'FAILURE !!!'
+  else
+    echo "Success."
+  fi
+
+  # Clean up
+  rm -r "$copy_on_disk" "$image_file"
+
+------------------------------------------------------------------------------
+
 exit 0