From 5576e7f76da73f3f5217f90d816cc19b6c0a5a77 Mon Sep 17 00:00:00 2001
From: Julian Andres Klode <julian.klode@canonical.com>
Date: Tue, 1 Aug 2023 13:59:09 +0200
Subject: Compare SHA256 to check if versions are really the same

If we know both SHA256, and they're different, the packages are. This
approach stores the SHA256 only at runtime, avoiding the overhead of
storing it on-disk, because when we update repositories we update all
of them anyhow.

Note that pkgCacheGenerator is hidden, so we can just modify its
ABI, hooray.

Closes: #931175
LP: #2029268
---
 apt-pkg/deb/deblistparser.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'apt-pkg/deb/deblistparser.h')

diff --git a/apt-pkg/deb/deblistparser.h b/apt-pkg/deb/deblistparser.h
index eefce2a6a..e6767d7d5 100644
--- a/apt-pkg/deb/deblistparser.h
+++ b/apt-pkg/deb/deblistparser.h
@@ -14,6 +14,9 @@
 #include <apt-pkg/pkgcache.h>
 #include <apt-pkg/pkgcachegen.h>
 #include <apt-pkg/tagfile.h>
+#ifdef APT_COMPILING_APT
+#include <apt-pkg/tagfile-keys.h>
+#endif
 
 #include <string>
 #include <vector>
@@ -90,6 +93,13 @@ class APT_HIDDEN debListParser : public pkgCacheListParser
 
    explicit debListParser(FileFd *File);
    virtual ~debListParser();
+
+#ifdef APT_COMPILING_APT
+   APT::StringView SHA256() const
+   {
+      return Section.Find(pkgTagSection::Key::SHA256);
+   }
+#endif
 };
 
 class APT_HIDDEN debDebFileParser : public debListParser
-- 
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