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experimental/hash

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adding primop function calculating hash of a string

Signed-off-by: Marc Weber <marco-oweber@gmx.de>
This commit is contained in:
Marc Weber 2013-02-07 00:03:46 +01:00 • committed by Eelco Dolstra
parent 8add116acd
commit 01a5ea9914
3 changed files with 33 additions and 0 deletions
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26
src/libexpr/primops.cc
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@ -1107,6 +1107,30 @@ static void prim_unsafeDiscardOutputDependency(EvalState & state, Value * * args
}
static void prim_hash(EvalState & state, Value * * args, Value & v)
{
PathSet context;
string type = state.forceStringNoCtx(*args[0]);
string s = state.forceStringNoCtx(*args[1]);
HashType ht;
if (type == "md5"){
ht = htMD5;
} else if (type == "sha256"){
ht = htSHA256;
} else {
throw Error(format("bad hash type `%1%'") % type);
}
Hash h = hashString(ht, s);
string hash = printHash(h);
mkString(v, hash, context);
};
/*************************************************************
* Versions
*************************************************************/
@ -1235,6 +1259,8 @@ void EvalState::createBaseEnv()
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
addPrimOp("__unsafeDiscardOutputDependency", 1, prim_unsafeDiscardOutputDependency);
addPrimOp("__hash", 2, prim_hash);
// Versions
addPrimOp("__parseDrvName", 1, prim_parseDrvName);
addPrimOp("__compareVersions", 2, prim_compareVersions);