fix(3p/nix/hash): smart pointers in HashSink r/1506

Change-Id: Ib2aaf42c8b234ee343c4653eb03f328c113dea86
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1492
Tested-by: BuildkiteCI
Reviewed-by: glittershark <grfn@gws.fyi>

1 files changed, 6 insertions, 2 deletions

diff --git a/third_party/nix/src/libutil/hash.hh b/third_party/nix/src/libutil/hash.hh
index 0b7b11edd0..208615f67b 100644
--- a/third_party/nix/src/libutil/hash.hh
+++ b/third_party/nix/src/libutil/hash.hh
@@ -88,9 +88,11 @@ Hash hashString(HashType ht, const std::string& s);
 /* Compute the hash of the given file. */
 Hash hashFile(HashType ht, const Path& path);
 
+/* A pair of the Hash, and the number of bytes consumed. */
+typedef std::pair<Hash, unsigned long long> HashResult;
+
 /* Compute the hash of the given path.  The hash is defined as
    (essentially) hashString(ht, dumpPath(path)). */
-typedef std::pair<Hash, unsigned long long> HashResult;
 HashResult hashPath(HashType ht, const Path& path,
                     PathFilter& filter = defaultPathFilter);
 
@@ -104,12 +106,14 @@ HashType parseHashType(const std::string& s);
 /* And the reverse. */
 std::string printHashType(HashType ht);
 
+namespace hash {
 union Ctx;
+}
 
 class HashSink : public BufferedSink {
  private:
   HashType ht;
-  Ctx* ctx;
+  std::unique_ptr<hash::Ctx> ctx;
   unsigned long long bytes;
 
  public: