Index: trunk/scripts/pv-fixup/lvmanip
===================================================================
--- trunk/scripts/pv-fixup/lvmanip	(revision 2285)
+++ trunk/scripts/pv-fixup/lvmanip	(revision 2321)
@@ -2,5 +2,5 @@
 exit 1
 
-DISK=/dev/mapper/36090a028407d6e2b2589a45cdb971489
+SOURCE=/dev/mapper/36090a028407d6e2b2589a45cdb971489
 
 # The name of the LVM archive to get data from
@@ -12,4 +12,15 @@
 lvmextractint () {
   perl -lne 'print $1 if (/'"$1"' = ([0-9]+)/)'
+}
+
+# Extract the first block of an lv to a file named part-$lv
+getfirstblock () {
+  lvname="$1"
+  offset=$(grep -A16 $'\t'$lvname $ARCHIVE  | grep pv0 | cut -f 2 -d ,);
+  if [ -z "$offset" ]; then echo "WARNING: LV not found";
+  else
+    echo "Extracting $lvname from offset $offset"
+    dd if=$SOURCE of=part-$lvname bs=1M skip=$(( $offset * 8192 + 384 )) bs=512 count=1;
+  fi
 }
 
@@ -70,5 +81,5 @@
   else
     echo "# Extracting $lvname from offset $offset PEs with length $length PEs"
-    echo dd if=$DISK of=/dev/xenvg/$lvname \
+    echo dd if=$SOURCE of=/dev/xenvg/$lvname \
       skip=$(( $offset * 64 + 3 )) bs=64K count=$(( $length * 64 ))
   fi
@@ -90,5 +101,5 @@
   else
     echo "# Extracting $lvname segment 2 from offset $offset PEs with length $length PEs"
-    echo dd if=$DISK of=/dev/xenvg/$lvname bs=64K \
+    echo dd if=$SOURCE of=/dev/xenvg/$lvname bs=64K \
       skip=$(($offset*64 + 3)) count=$(($length*64)) seek=$(($seek*64))
   fi