tools-update creates links to tools to write usb or create iso

recipes-help/tools-update/tools-update_1.0.bb

+SUMMARY = "helper script"
+DESCRIPTION = "compare built versions with the ones on the target system"
+
+AUTHOR = "Elphel Inc."
+HOMEPAGE = "http://www3.elphel.com/" 
+
+LICENSE = "GPLv3"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/GPL-3.0;md5=c79ff39f19dfec6d293b95dea7b07891"
+
+deltask do_fetch
+deltask do_unpack
+deltask do_patch
+deltask do_configure 
+deltask do_compile 
+deltask do_install 
+deltask do_populate_sysroot
+deltask do_populate_lic 
+deltask do_rm_work
+#deltask do_build
+
+inherit nopackages
+
+INHIBIT_DEFAULT_DEPS = "1"
+DEPENDS = ""
+PACKAGES = ""
+
+do_run[nostamp] = "1"
+
+VPATH = "${TOPDIR}/../../tools/elphel-tools-update"
+
+python do_run(){
+
+  import os
+  import subprocess
+
+  VPATH = d.getVar('VPATH'  , True)
+  DEPLOY_DIR_IMAGE = d.getVar('DEPLOY_DIR_IMAGE'  , True)
+  # mmc
+  PRODUCTION_DIR = d.getVar('PRODUCTION_DIR'  , True)
+  
+  for file in os.listdir(VPATH):
+      fname,fext = os.path.splitext(file)
+      if fext==".py":
+        #create link
+        if os.path.isfile(DEPLOY_DIR_IMAGE+"/"+PRODUCTION_DIR+"/"+file):
+          cmd = "rm "+DEPLOY_DIR_IMAGE+"/"+PRODUCTION_DIR+"/"+file
+          subprocess.call(cmd,shell=True)
+        cmd = "ln -sf "+VPATH+"/"+file+" "+DEPLOY_DIR_IMAGE+"/"+PRODUCTION_DIR
+        subprocess.call(cmd,shell=True)
+}
+
+addtask do_run before do_build
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