Initial remote commit

misc_tools/test3.py

@@ -0,0 +1,75 @@
+import struct
+
+BSIZE = 4096
+IPG   = 8192
+
+def read_block(f, block_num):
+    f.seek(block_num * BSIZE)
+    return f.read(BSIZE)
+
+def get_extents(inode_data):
+    blocks = []
+    if struct.unpack_from('<H', inode_data, 40)[0] != 0xf30a:
+        return blocks
+    entries = struct.unpack_from('<H', inode_data, 42)[0]
+    depth   = struct.unpack_from('<H', inode_data, 46)[0]
+    if depth == 0:
+        for i in range(min(entries, 4)):
+            off    = 52 + i*12
+            ee_len = struct.unpack_from('<H', inode_data, off+4)[0]
+            ee_hi  = struct.unpack_from('<H', inode_data, off+6)[0]
+            ee_lo  = struct.unpack_from('<I', inode_data, off+8)[0]
+            start  = (ee_hi<<32)|ee_lo
+            for b in range(min(ee_len, 8)):
+                blocks.append(start + b)
+    return blocks
+
+def read_inode(f, inode_num):
+    group    = (inode_num-1)//IPG
+    idx      = (inode_num-1)%IPG
+    it_block = 1070 + group*512
+    f.seek(it_block*BSIZE + idx*256)
+    return f.read(256)
+
+def list_dir(f, inode_num):
+    data = read_inode(f, inode_num)
+    entries = []
+    for blk in get_extents(data):
+        blk_data = read_block(f, blk)
+        off = 0
+        while off < BSIZE - 8:
+            ino     = struct.unpack_from('<I', blk_data, off)[0]
+            rec_len = struct.unpack_from('<H', blk_data, off+4)[0]
+            name_len= blk_data[off+6]
+            ftype   = blk_data[off+7]
+            if rec_len < 8: break
+            if ino > 0 and name_len > 0:
+                name = blk_data[off+8:off+8+name_len].decode('utf-8',errors='replace')
+                if name not in ('.','..'):
+                    entries.append((ino, name, ftype))
+            off += rec_len
+    return entries
+
+with open('/dev/nbd0','rb') as f:
+    # /var = inode 1310721
+    print('=== /var (inode 1310721) ===')
+    for ino, name, ftype in list_dir(f, 1310721):
+        tname = {1:'file',2:'dir',7:'link'}.get(ftype,'?')
+        print(f'  {tname:4s} {name:30s} inode={ino}')
+
+    # Find /var/lib
+    print()
+    for ino, name, ftype in list_dir(f, 1310721):
+        if name == 'lib':
+            print(f'=== /var/lib (inode {ino}) ===')
+            for i2, n2, f2 in list_dir(f, ino):
+                tname = {1:'file',2:'dir',7:'link'}.get(f2,'?')
+                print(f'  {tname:4s} {n2:30s} inode={i2}')
+
+            # Find pterodactyl
+            for i2, n2, f2 in list_dir(f, ino):
+                if n2 == 'pterodactyl':
+                    print(f'\n=== /var/lib/pterodactyl (inode {i2}) ===')
+                    for i3, n3, f3 in list_dir(f, i2):
+                        tname = {1:'file',2:'dir',7:'link'}.get(f3,'?')
+                        print(f'  {tname:4s} {n3:30s} inode={i3}')