[Bug 1274466] Re: apt-ftparchive on-disk cache format changed between lucid and precise, results in Packages files with silently corrupted checksums fields

[Michael Vogt]

Its not the fault of libdb, its the fault of commit
650faab01603caac04494d54cf6b10a65c00ea13

Here is the reason for the bug:
--- apt-0.7.25.3ubuntu7/ftparchive/cachedb.h
+++ apt-0.8.16~exp12ubuntu10/ftparchive/cachedb.h
...
    struct StatStore
    {
       uint32_t Flags;
       uint32_t mtime;          
-      uint32_t FileSize;
+      uint64_t FileSize;
       uint8_t  MD5[16];
       uint8_t  SHA1[20];
       uint8_t  SHA256[32];
+      uint8_t  SHA512[64];
    } CurStat;
...

Adding the sha512 at the end is fine as there is a flag for the hashes
so even if it reads garbage it will not use the not-yet-generated sha512
hash.

But the change of FileSize made it incompatibel.

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https://bugs.launchpad.net/bugs/1274466

Title:
  apt-ftparchive on-disk cache format changed between lucid and precise,
  results in Packages files with silently corrupted checksums fields

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