* Unify the treatment of sources copied to the store, and recursive

  SHA-256 outputs of fixed-output derivations.  I.e. they now produce
  the same store path:

  $ nix-store --add x
  /nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x

  $ nix-store --add-fixed --recursive sha256 x
  /nix/store/j2fq9qxvvxgqymvpszhs773ncci45xsj-x

  the latter being the same as the path that a derivation

    derivation {
      name = "x";
      outputHashAlgo = "sha256";
      outputHashMode = "recursive";
      outputHash = "...";
      ...
    };

  produces.

  This does change the output path for such fixed-output derivations.
  Fortunately they are quite rare.  The most common use is fetchsvn
  calls with SHA-256 hashes.  (There are a handful of those is
  Nixpkgs, mostly unstable development packages.)
  
* Documented the computation of store paths (in store-api.cc).

1 files changed, 5 insertions, 4 deletions

diff --git a/src/libstore/remote-store.cc b/src/libstore/remote-store.cc
index 7e5fa2d865..f79b22310b 100644
--- a/src/libstore/remote-store.cc
+++ b/src/libstore/remote-store.cc
@@ -278,14 +278,15 @@ Path RemoteStore::queryDeriver(const Path & path)
 }
 
 
-Path RemoteStore::addToStore(const Path & _srcPath, bool fixed,
+Path RemoteStore::addToStore(const Path & _srcPath,
     bool recursive, string hashAlgo, PathFilter & filter)
 {
     Path srcPath(absPath(_srcPath));
     
     writeInt(wopAddToStore, to);
     writeString(baseNameOf(srcPath), to);
-    writeInt(fixed ? 1 : 0, to);
+    /* backwards compatibility hack */
+    writeInt((hashAlgo == "sha256" && recursive) ? 0 : 1, to);
     writeInt(recursive ? 1 : 0, to);
     writeString(hashAlgo, to);
     dumpPath(srcPath, to, filter);
@@ -294,11 +295,11 @@ Path RemoteStore::addToStore(const Path & _srcPath, bool fixed,
 }
 
 
-Path RemoteStore::addTextToStore(const string & suffix, const string & s,
+Path RemoteStore::addTextToStore(const string & name, const string & s,
     const PathSet & references)
 {
     writeInt(wopAddTextToStore, to);
-    writeString(suffix, to);
+    writeString(name, to);
     writeString(s, to);
     writeStringSet(references, to);