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Fix 'error 9 while decompressing xz file'

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Once we've started writing data to a Sink, we can't restart a download
request, because then we end up writing duplicate data to the
Sink. Therefore we shouldn't handle retries in Downloader but at a
higher level (in particular, in copyStorePath()).

Fixes #2952.

(cherry picked from commit a67cf5a358)
This commit is contained in:
Eelco Dolstra 2019-06-24 21:48:52 +02:00
parent 2fef4dd296
commit 78fa47a7f0
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GPG key ID: 8170B4726D7198DE
7 changed files with 156 additions and 119 deletions
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18
src/libstore/binary-cache-store.cc
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@ -10,6 +10,8 @@
#include "nar-info-disk-cache.hh"
#include "nar-accessor.hh"
#include "json.hh"
#include "retry.hh"
#include "download.hh"
#include <chrono>
@ -79,13 +81,15 @@ void BinaryCacheStore::getFile(const std::string & path, Sink & sink)
std::shared_ptr<std::string> BinaryCacheStore::getFile(const std::string & path)
{
StringSink sink;
try {
getFile(path, sink);
} catch (NoSuchBinaryCacheFile &) {
return nullptr;
}
return sink.s;
return retry<std::shared_ptr<std::string>>(downloadSettings.tries, [&]() -> std::shared_ptr<std::string> {
StringSink sink;
try {
getFile(path, sink);
} catch (NoSuchBinaryCacheFile &) {
return nullptr;
}
return sink.s;
});
}
Path BinaryCacheStore::narInfoFileFor(const Path & storePath)