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

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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).
This commit is contained in:
Eelco Dolstra 2008-12-03 15:06:30 +00:00
parent 09bc0c502c
commit 64519cfd65
12 changed files with 191 additions and 79 deletions
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11
src/libstore/local-store.cc
View file

@ -670,14 +670,14 @@ void LocalStore::invalidatePath(const Path & path)
}
Path LocalStore::addToStore(const Path & _srcPath, bool fixed,
Path LocalStore::addToStore(const Path & _srcPath,
bool recursive, string hashAlgo, PathFilter & filter)
{
Path srcPath(absPath(_srcPath));
debug(format("adding `%1%' to the store") % srcPath);
std::pair<Path, Hash> pr =
computeStorePathForPath(srcPath, fixed, recursive, hashAlgo, filter);
computeStorePathForPath(srcPath, recursive, hashAlgo, filter);
Path & dstPath(pr.first);
Hash & h(pr.second);
@ -696,10 +696,13 @@ Path LocalStore::addToStore(const Path & _srcPath, bool fixed,
copyPath(srcPath, dstPath, filter);
/* !!! */
#if 0
Hash h2 = hashPath(htSHA256, dstPath, filter);
if (h != h2)
throw Error(format("contents of `%1%' changed while copying it to `%2%' (%3% -> %4%)")
% srcPath % dstPath % printHash(h) % printHash(h2));
#endif
canonicalisePathMetaData(dstPath);
@ -713,10 +716,10 @@ Path LocalStore::addToStore(const Path & _srcPath, bool fixed,
}
Path LocalStore::addTextToStore(const string & suffix, const string & s,
Path LocalStore::addTextToStore(const string & name, const string & s,
const PathSet & references)
{
Path dstPath = computeStorePathForText(suffix, s, references);
Path dstPath = computeStorePathForText(name, s, references);
addTempRoot(dstPath);