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* Start move towards SHA-256 hashes instead of MD5.

Browse source 
* Start cleaning up unique store path generation (they weren't always
  unique; in particular the suffix ("-aterm-2.2", "-builder.sh") was
  not part of the hash, therefore changes to the suffix would cause
  multiple store objects with the same hash).
This commit is contained in:
Eelco Dolstra 2005-01-14 13:51:38 +00:00
parent a7b94e87d7
commit 9530cc3170
9 changed files with 63 additions and 34 deletions
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19
src/libexpr/primops.cc
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@ -59,7 +59,7 @@ static Path copyAtom(EvalState & state, const Path & srcPath)
ne.closure.elems[dstPath] = elem;
Hash drvHash = hashDerivation(state, ne);
Path drvPath = writeTerm(unparseStoreExpr(ne), "");
Path drvPath = writeTerm(unparseStoreExpr(ne), "c");
state.drvHashes.insert(make_pair(drvPath, drvHash));
state.drvRoots[drvPath] = ne.closure.roots;
@ -250,21 +250,32 @@ static Expr primDerivation(EvalState & state, const ATermVector & _args)
throw Error(format("invalid character `%1%' in derivation name `%2%'")
% *i % drvName);
}
/* Construct the "masked" derivation store expression, which is
the final one except that the list of output paths is set to
the set of output names, and the corresponding environment
variables have an empty value. This ensures that changes in
the set of output names do get reflected in the hash. */
ne.derivation.env["out"] = "";
ne.derivation.outputs.insert("out");
/* Determine the output path by hashing the Nix expression with no
outputs to produce a unique but deterministic path name for
this derivation. */
if (!outHashGiven) outHash = hashDerivation(state, ne);
Path outPath = canonPath(nixStore + "/" +
((string) outHash).c_str() + "-" + drvName);
Path outPath = makeStorePath("output:out",
outHash, drvName);
/* Construct the final derivation store expression. */
ne.derivation.env["out"] = outPath;
ne.derivation.outputs.clear();
ne.derivation.outputs.insert(outPath);
/* Write the resulting term into the Nix store directory. */
Hash drvHash = outHashGiven
? hashString((string) outHash + outPath, htMD5)
: hashDerivation(state, ne);
Path drvPath = writeTerm(unparseStoreExpr(ne), "-d-" + drvName);
Path drvPath = writeTerm(unparseStoreExpr(ne), "d-" + drvName);
printMsg(lvlChatty, format("instantiated `%1%' -> `%2%'")
% drvName % drvPath);