calculate only expected hashes in methods

Methods get told which hashes are expected by the acquire system, which
means we can use this list to restrict what we calculate in the methods
as any extra we are calculating is wasted effort as we can't compare it
with anything anyway.

Adding support for a new hash algorithm is therefore 'free' now and if a
algorithm is no longer provided in a repository for a file, we
automatically stop calculating it.

In practice this results in a speed-up in Debian as we don't have SHA512
here (so far), so we practically stop calculating it.

1 files changed, 1 insertions, 1 deletions

diff --git a/methods/file.cc b/methods/file.cc
index 5d9d7b951..043ab04b8 100644
--- a/methods/file.cc
+++ b/methods/file.cc
@@ -87,7 +87,7 @@ bool FileMethod::Fetch(FetchItem *Itm)
    if (Res.Filename.empty() == true)
       return _error->Error(_("File not found"));
 
-   Hashes Hash;
+   Hashes Hash(Itm->ExpectedHashes);
    FileFd Fd(Res.Filename, FileFd::ReadOnly);
    Hash.AddFD(Fd);
    Res.TakeHashes(Hash);