From 8d9fc3f9b189579e0fb73f8e7aed3c7a7aee8340 Mon Sep 17 00:00:00 2001
From: justmarvinn <justmarvinnn@gmail.com>
Date: Thu, 27 Mar 2025 16:21:00 +0000
Subject: [PATCH] initial commit

---
 blkenvflash | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 blkenvflash

diff --git a/blkenvflash b/blkenvflash
new file mode 100644
index 0000000..362aa19
--- /dev/null
+++ b/blkenvflash
@@ -0,0 +1,121 @@
+#!/usr/bin/python3
+
+# == BLKENVFLASH == written by Rene K. Mueller <spiritdude@gmail.com>
+#
+# Description:
+#    Writes an image (.img) or to the SD card direct from existing .env.txt for LuckFox Pico Pro/Max
+#
+#       % ./blkenvflash disk.img
+#       -- inquery with `lsblk` which device is your SD card resides --
+#       % sudo dd if=disk.img of=/dev/sdX bs=1M; sync
+#
+#       -- or do in one step -- 
+#       % sudo ./blkenflash /dev/sdX
+#
+# License: MIT
+#
+# History:
+# 2024/06/18: after the hint by A. Schuetz https://github.com/LuckfoxTECH/luckfox-pico/issues/129 was able to make script functional
+# 2024/06/10: start
+
+import os, sys, re, subprocess, shutil
+import atexit
+
+VERSION = '0.0.1'
+
+me = sys.argv.pop(0)
+path = os.path.dirname(me)
+me = os.path.basename(me)
+
+step = 'sdcard'            # -- hard-codec to do one sdcard writing
+
+if len(sys.argv) != 1:
+   print(f'''USAGE {me} <file or device>
+   examples:
+      % ./{me} disk.img
+      % lsblk     -- and check output on which /dev/sdX your SD card resides --
+      % sudo dd if=disk.img of=/dev/sdX bs=1M; sync
+      
+      -- or in one step --
+      % sudo ./{me} /dev/sdX
+''')
+   sys.exit(-1)
+   
+dev = sys.argv.pop(0)
+
+print(f"== {me} {VERSION} ==")
+print(f"writing to {dev}")
+   
+
+# -- a few helpers to en/decode nice numbers
+def true_size(s):
+   u = { 'B': 1, 'K': 1024, 'M': 1024*1024, 'G': 1024*1024*1024 }
+   if m := re.search('(\d+)([BKMG])',s):
+      return int(m.group(1)) * u[m.group(2)]
+   return 0
+
+def nice_size(n):
+   u = { 'B': 1, 'K': 1024, 'M': 1024*1024, 'G': 1024*1024*1024 }
+   for k,v in reversed(u.items()): 
+      if n >= v and n % v == 0:
+         return f"{n//v:,}{k}"
+   return f"{n:,}B"
+
+def cleanup():
+   if os.path.exists(".env.txt.orig"):
+      os.rename(".env.txt.orig",".env.txt")
+   print("done.")
+
+atexit.register(cleanup)
+   
+with open(".env.txt") as fh:
+   env2 = [ ]
+   for l in fh.readlines():
+      if m := re.search('(blkdevparts|sd_parts)=(\w+)',l):
+         _type = m.group(1)
+         _dev = m.group(2)
+         l = re.sub('blkdevparts=\w+:','',l)
+         p = l.split(',')
+         c_off = 0
+         if step=='sdcard' and _dev == 'mmcblk1': 
+            for e in p:
+               #print(e)
+               if (m := re.search('(\d+[KMG])@(\d+[KMG])\((\w+)\)',e)) or (m := re.search('(\d+[KMG])\((\w+)\)',e)):
+                  if len(m.groups())==3:
+                     size = true_size(m.group(1))
+                     off = true_size(m.group(2))
+                     name = m.group(3)
+                  else:
+                     size = true_size(m.group(1))
+                     name = m.group(2)
+                     off = 0
+                  print(f"   {_dev}: {name}.img size:{size:,}/{nice_size(size)} (offset:{off:,}/{nice_size(off)})",end='')
+                  if os.path.exists(f"{name}.img"):
+                     size_ = os.path.getsize(f"{name}.img")           # -- actual size
+                     print(f" imgsize:{size_:,} ({nice_size(size_)})")
+                     if step=='sdcard':
+                        # -- it seems the explicit `off` seems not taking effect?
+                        cmd = ['dd',f"if={name}.img",f"of={dev}","bs=1k",f"seek={c_off//1024}"]
+                        try:
+                           res = subprocess.run(cmd,stdout=subprocess.DEVNULL,stderr=subprocess.DEVNULL,check=True)
+                        except subprocess.CalledProcessError as e:
+                           print(f"ERROR: {e}",e.stderr)
+                           sys.exit(-1)
+                     c_off += size
+                  else:
+                     print()
+                     print(f"ERROR: '{name}.img' not found")
+                     sys.exit(-1)
+                     
+         if _dev == 'mmcblk0':
+            env2.append(l)
+
+if step=='emmc':           # -- untested, not needed as 'upgrade_tool' does this already 
+   shutil.copy(".env.txt",".env.txt.orig")
+   with open(".env.txt","w") as fh:
+      fh.write("\n".join(env2))
+
+   # -- prepare upgrade_tool call to write to eMMC
+   print(f"{path}/upgrade_tool")
+   subprocess.run([f'{path}/upgrade_tool','uf','update.img'])   
+