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From c705a6287f8c7fb5e37dad0ac87257731a41fa69 Mon Sep 17 00:00:00 2001
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From: chantra <chantr4@gmail.com>
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Date: Sat, 29 Jan 2022 07:00:27 +0000
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Subject: [PATCH 08/30] [rpm2extents] Add script to troubleshoot transcoded
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file content This script is essentially dumping the metadata written at the
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end of the transcoded files, it will also be used as part of the end-to-end
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tests.
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---
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scripts/rpm2extents_dump | 94 ++++++++++++++++++++++++++++++++++++++++
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1 file changed, 94 insertions(+)
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create mode 100755 scripts/rpm2extents_dump
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diff --git a/scripts/rpm2extents_dump b/scripts/rpm2extents_dump
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new file mode 100755
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index 000000000..596a59a49
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--- /dev/null
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+++ b/scripts/rpm2extents_dump
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@@ -0,0 +1,94 @@
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+#!/usr/bin/env python3
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+
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+import argparse
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+import binascii
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+import os
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+import struct
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+import sys
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+
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+MAGIC_SIZE = 8
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+MAGIC_STR = b'KWTSH100'
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+
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+POS_SIZE = 8
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+
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+def keep_position(func):
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+ def wrapper(*args, **kwargs):
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+ curr = args[0].tell()
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+ res = func(*args, **kwargs)
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+ f.seek(curr, os.SEEK_SET)
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+ return res
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+ return wrapper
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+
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+def read_validation_digest(f, validation_offset):
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+ digests = []
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+ # validation
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+ f.seek(validation_offset, os.SEEK_SET)
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+ val_content_len, val_digests_num = struct.unpack('=QI', f.read(8+4))
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+ for i in range(val_digests_num):
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+ algo_name_len, digest_len = struct.unpack('=II', f.read(8))
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+ algo_name, digest = struct.unpack(f'{algo_name_len}s{digest_len}s', f.read(algo_name_len+digest_len))
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+ digests.append((algo_name, binascii.hexlify(digest)))
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+ return digests
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+
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+
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+def read_digests_table(f, digest_offset):
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+ digests = []
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+ # validation
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+ f.seek(digest_offset, os.SEEK_SET)
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+ table_len, digest_len = struct.unpack('=II', f.read(8))
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+
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+ for i in range(table_len):
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+ digest, pos = struct.unpack(f'{digest_len}sQ', f.read(digest_len + 8))
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+ digests.append((pos, binascii.hexlify(digest)))
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+ return digests
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+
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+def read_signature_output(f, signature_offset):
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+ f.seek(signature_offset, os.SEEK_SET)
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+ signature_rc, signature_output_len = struct.unpack('=IQ', f.read(12))
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+ return signature_rc, f.read(signature_output_len)
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+
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+@keep_position
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+def parse_file(f):
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+ digests = []
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+ pos_table_offset = f.seek(-8 - 3*POS_SIZE, os.SEEK_END)
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+ signature_offset, digest_offset, validation_offset = struct.unpack('=QQQ', f.read(3*POS_SIZE))
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+
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+ validation_digests = read_validation_digest(f, validation_offset)
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+ digests_table = read_digests_table(f, digest_offset)
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+ signature_ouput = read_signature_output(f, signature_offset)
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+
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+ return validation_digests, digests_table, signature_ouput
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+
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+@keep_position
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+def is_transcoded(f):
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+ f.seek(-MAGIC_SIZE, os.SEEK_END)
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+ magic = f.read(MAGIC_SIZE)
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+ return magic == MAGIC_STR
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+
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+def arg_parse():
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+ parser = argparse.ArgumentParser()
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+ parser.add_argument('--dump-signature', action='store_true')
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+ parser.add_argument('--dump-file-digest-table', action='store_true')
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+ parser.add_argument('--dump-digests', action='store_true')
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+ parser.add_argument('file')
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+
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+ return parser.parse_args()
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+
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+if __name__ == '__main__':
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+ args = arg_parse()
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+ f = open(args.file, 'rb')
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+ if not is_transcoded(f):
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+ sys.exit(1)
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+
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+ validation_digests, digests_table, signature_output = parse_file(f)
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+ if(args.dump_file_digest_table):
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+ for digest in digests_table:
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+ print(f"FileDigest {hex(digest[0])}: {digest[1]}")
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+
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+ if(args.dump_digests):
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+ for validation_digest in validation_digests:
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+ print(f"HeaderDigest {validation_digest[0]} {validation_digest[1]}")
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+
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+ if(args.dump_signature):
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+ print(f"RPMSignOutput RC {signature_output[0]}\nRPMSignOutput Content {signature_output[1].decode()}")
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+
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--
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2.35.1
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