Support encrypted swap

tomb

@@ -138,11 +138,47 @@ check_swap() {
     # Return 2 if swap(s) is(are) used, but ALL encrypted
     local swaps=$(awk '/^\// { print $1 }' /proc/swaps 2>/dev/null)
     [[ -z "$swaps" ]] && return 0                # No swap partition is active
+    # Check whether all swaps are encrypted, and return 2
+    # If any of the swaps is not encrypted, we bail out and return 1.
+    ret=1
+    for s in $=swaps; do
+	bone=`sudo file $s`
+	if `echo "$bone" | grep 'swap file' &>/dev/null`; then
+	    # It's a regular (unencrypted) swap file
+	    ret=1
+	    break
+        elif `echo "$bone" | grep 'symbolic link' &>/dev/null`; then
+	    # Might link to a block
+	    ret=1
+	    if [ "/dev/mapper" = "${s%/*}" ]; then
+		is_crypt=`sudo dmsetup status "$s" | awk '/crypt/ {print $3}'`
+		if [ "crypt" = "$is_crypt" ]; then
+		    ret=2
+		fi
+	    else
+		break
+	    fi
+	elif `echo "$bone" | grep 'block special' &>/dev/null`; then
+	    # Is a block
+	    ret=1
+            is_crypt=`sudo dmsetup status "$s" | awk '/crypt/ {print $3}'`
+	    if [ "crypt" = "$is_crypt" ]; then
+		ret=2
+	    else
+		break
+	    fi
+	fi
+    done
     no  "An active swap partition is detected, this poses security risks."
-    no  "You can deactivate all swap partitions using the command:"
-    no  " swapoff -a"
-    no  "But if you want to proceed like this, use the -f (force) flag."
-    die "Operation aborted."
+    if [[ $ret -eq 2 ]]; then
+	yes "All your swaps are belong to crypt.  Good."
+    else
+	no  "You can deactivate all swap partitions using the command:"
+	no  " swapoff -a"
+	no  "But if you want to proceed like this, use the -f (force) flag."
+	die "Operation aborted."
+    fi
+    return $ret
 }
 
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