libutil: convert readFileSource to a generator

Change-Id: I5f92b15fd367d46eb047d74ab6e317b4f51a46d3

2 files changed, 2 insertions, 2 deletions

diff --git a/src/nix/add-to-store.cc b/src/nix/add-to-store.cc
index f7e3212be..7e16e12c3 100644
--- a/src/nix/add-to-store.cc
+++ b/src/nix/add-to-store.cc
@@ -37,7 +37,7 @@ struct CmdAddToStore : MixDryRun, StoreCommand
         Hash hash = narHash;
         if (ingestionMethod == FileIngestionMethod::Flat) {
             HashSink hsink(htSHA256);
-            readFileSource(path)->drainInto(hsink);
+            hsink << readFileSource(path);
             hash = hsink.finish().first;
         }
 
diff --git a/src/nix/hash.cc b/src/nix/hash.cc
index 8d4bc7826..d9079d551 100644
--- a/src/nix/hash.cc
+++ b/src/nix/hash.cc
@@ -85,7 +85,7 @@ struct CmdHashBase : Command
 
             switch (mode) {
             case FileIngestionMethod::Flat:
-                readFileSource(path)->drainInto(*hashSink);
+                *hashSink << readFileSource(path);
                 break;
             case FileIngestionMethod::Recursive:
                 *hashSink << dumpPath(path);