Add create_ventoy_iso_part_dm.sh (#3497)

INSTALL/tool/create_ventoy_iso_part_dm.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+if [ "$(id -u)" -ne 0 ]; then    
+    echo "Please run with sudo ..."
+    exit 1
+fi
+
+oldpwd=$(pwd)
+VPART=""
+
+if dmsetup -h > /dev/null 2>&1; then
+    VPART_MAJOR_MINOR=$(dmsetup table ventoy | head -n 1 | awk '{print $4}')    
+    cd /sys/class/block/
+    for t in *; do
+        if grep -q "^${VPART_MAJOR_MINOR}$" $t/dev; then
+            VPART=$t
+            echo 0 $(cat /sys/class/block/$VPART/size) linear /dev/$VPART 0 | dmsetup create $VPART
+            dmsetup mknodes "$VPART" > /dev/null 2>&1
+            break
+        fi
+    done
+    cd $oldpwd
+    
+    if [ -z "$VPART" ]; then
+        echo "$VPART_MAJOR_MINOR not found"
+        dmsetup ls; dmsetup info ventoy; dmsetup table ventoy
+        exit 1
+    else                                 
+        if [ ! -b "/dev/mapper/$VPART" ]; then
+            udevadm trigger --type=devices --action=add  > /dev/null 2>&1
+            udevadm settle > /dev/null 2>&1
+        fi
+        echo "Create /dev/mapper/$VPART success"
+    fi    
+else
+    echo "dmsetup program not avaliable"
+    exit 1
+fi