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builtins.{fetchurl,fetchTarball}: Support a sha256 attribute

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Also, allow builtins.{fetchurl,fetchTarball} in restricted mode if a
hash is specified.
This commit is contained in:
Eelco Dolstra 2016-07-26 21:16:52 +02:00
parent ee3032e4de
commit 06bbfb6004
3 changed files with 37 additions and 12 deletions
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10
src/libexpr/primops.cc
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@ -1680,9 +1680,8 @@ static void prim_compareVersions(EvalState & state, const Pos & pos, Value * * a
void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
const string & who, bool unpack)
{
if (state.restricted) throw Error(format("‘%1%’ is not allowed in restricted mode") % who);
string url;
Hash expectedHash;
state.forceValue(*args[0]);
@ -1694,6 +1693,8 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
string name(attr.name);
if (name == "url")
url = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (name == "sha256")
expectedHash = parseHash16or32(htSHA256, state.forceStringNoCtx(*attr.value, *attr.pos));
else
throw EvalError(format("unsupported argument ‘%1%’ to ‘%2%’, at %3%") % attr.name % who % attr.pos);
}
@ -1704,7 +1705,10 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
} else
url = state.forceStringNoCtx(*args[0], pos);
Path res = makeDownloader()->downloadCached(state.store, url, unpack);
if (state.restricted && !expectedHash)
throw Error(format("‘%1%’ is not allowed in restricted mode") % who);
Path res = makeDownloader()->downloadCached(state.store, url, unpack, expectedHash);
mkString(v, res, PathSet({res}));
}