Implement S3BinaryCacheStore::queryAllValidPaths()

This allows commands like "nix verify --all" or "nix path-info --all"
to work on S3 caches.

Unfortunately, this requires some ugly hackery: when querying the
contents of the bucket, we don't want to have to read every .narinfo
file. But the S3 bucket keys only include the hash part of each store
path, not the name part. So as a special exception
queryAllValidPaths() can now return store paths *without* the name
part, and queryPathInfo() accepts such store paths (returning a
ValidPathInfo object containing the full name).

1 files changed, 3 insertions, 2 deletions

diff --git a/src/libstore/nar-info-disk-cache.hh b/src/libstore/nar-info-disk-cache.hh
index ee1aafc63a5d..f4e3fbbdcbdc 100644
--- a/src/libstore/nar-info-disk-cache.hh
+++ b/src/libstore/nar-info-disk-cache.hh
@@ -15,10 +15,11 @@ public:
     virtual bool cacheExists(const std::string & uri) = 0;
 
     virtual std::pair<Outcome, std::shared_ptr<NarInfo>> lookupNarInfo(
-        const std::string & uri, const Path & storePath) = 0;
+        const std::string & uri, const std::string & hashPart) = 0;
 
     virtual void upsertNarInfo(
-        const std::string & uri, std::shared_ptr<ValidPathInfo> narInfo) = 0;
+        const std::string & uri, const std::string & hashPart,
+        std::shared_ptr<ValidPathInfo> info) = 0;
 };
 
 /* Return a singleton cache object that can be used concurrently by