wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-06-27 12:41:15 +02:00
Code Activity

* When obtaining derivations from Nix expressions, ignore all

Browse source 
expressions that cause an assertion failure (like `assert system ==
  "i686-linux"').  This allows all-packages.nix in Nixpkgs to be used
  on all platforms, even if some Nix expressions don't work on all
  platforms.

  Not sure if this is a good idea; it's a bit hacky.  In particular,
  due to laziness some derivations might appear in `nix-env -qa' but
  disappear in `nix-env -qas' or `nix-env -i'.

  Commit 5000!
This commit is contained in:
Eelco Dolstra 2006-03-08 16:03:58 +00:00
parent 9088dee9e2
commit 6dca5c9099
3 changed files with 98 additions and 70 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/libexpr/eval.cc
View file

@ -383,7 +383,13 @@ Expr evalExpr(EvalState & state, Expr e)
/* Otherwise, evaluate and memoize. */
state.normalForms.set(e, state.blackHole);
nf = evalExpr2(state, e);
try {
nf = evalExpr2(state, e);
} catch (Error & err) {
debug("removing black hole");
state.normalForms.remove(e);
throw;
}
state.normalForms.set(e, nf);
return nf;
}

82
src/libexpr/get-drvs.cc
View file

@ -5,40 +5,51 @@
typedef set<Expr> Exprs;
/* Evaluate expression `e'. If it evaluates to an attribute set of
type `derivation', then put information about it in `drvs' (unless
it's already in `doneExprs'). The result boolean indicates whether
it makes sense for the caller to recursively search for derivations
in `e'. */
static bool getDerivation(EvalState & state, Expr e,
DrvInfos & drvs, Exprs & doneExprs)
{
ATermList es;
e = evalExpr(state, e);
if (!matchAttrs(e, es)) return false;
try {
ATermList es;
e = evalExpr(state, e);
if (!matchAttrs(e, es)) return true;
ATermMap attrs;
queryAllAttrs(e, attrs, false);
ATermMap attrs;
queryAllAttrs(e, attrs, false);
Expr a = attrs.get("type");
if (!a || evalString(state, a) != "derivation") return false;
Expr a = attrs.get("type");
if (!a || evalString(state, a) != "derivation") return true;
/* Remove spurious duplicates (e.g., an attribute set like `rec {
x = derivation {...}; y = x;}'. */
if (doneExprs.find(e) != doneExprs.end()) return true;
doneExprs.insert(e);
/* Remove spurious duplicates (e.g., an attribute set like
`rec { x = derivation {...}; y = x;}'. */
if (doneExprs.find(e) != doneExprs.end()) return false;
doneExprs.insert(e);
DrvInfo drv;
DrvInfo drv;
a = attrs.get("name");
if (!a) throw badTerm("derivation name missing", e);
drv.name = evalString(state, a);
a = attrs.get("name");
if (!a) throw badTerm("derivation name missing", e);
drv.name = evalString(state, a);
a = attrs.get("system");
if (!a)
drv.system = "unknown";
else
drv.system = evalString(state, a);
a = attrs.get("system");
if (!a)
drv.system = "unknown";
else
drv.system = evalString(state, a);
drv.attrs = attrs;
drv.attrs = attrs;
drvs.push_back(drv);
return true;
drvs.push_back(drv);
return false;
} catch (AssertionError & e) {
return false;
}
}
@ -46,9 +57,10 @@ bool getDerivation(EvalState & state, Expr e, DrvInfo & drv)
{
Exprs doneExprs;
DrvInfos drvs;
bool result = getDerivation(state, e, drvs, doneExprs);
if (result) drv = drvs.front();
return result;
getDerivation(state, e, drvs, doneExprs);
if (drvs.size() != 1) return false;
drv = drvs.front();
return true;
}
@ -101,26 +113,28 @@ static void getDerivations(EvalState & state, Expr e,
ATermList es;
DrvInfo drv;
e = evalExpr(state, e);
if (getDerivation(state, e, drvs, doneExprs)) {
if (!getDerivation(state, e, drvs, doneExprs)) {
if (apType != apNone) throw attrError;
return;
}
e = evalExpr(state, e);
if (matchAttrs(e, es)) {
if (apType != apNone && apType != apAttr) throw attrError;
ATermMap drvMap;
queryAllAttrs(e, drvMap);
if (apType == apNone) {
for (ATermIterator i(drvMap.keys()); i; ++i) {
debug(format("evaluating attribute `%1%'") % aterm2String(*i));
startNest(nest, lvlDebug,
format("evaluating attribute `%1%'") % aterm2String(*i));
getDerivation(state, drvMap.get(*i), drvs, doneExprs);
}
} else {
Expr e2 = drvMap.get(attr);
if (!e2) throw Error(format("attribute `%1%' in selection path not found") % attr);
debug(format("evaluating attribute `%1%'") % attr);
startNest(nest, lvlDebug,
format("evaluating attribute `%1%'") % attr);
getDerivation(state, e2, drvs, doneExprs);
if (!attrPath.empty())
getDerivations(state, e2, drvs, doneExprs, attrPathRest);
@ -132,14 +146,16 @@ static void getDerivations(EvalState & state, Expr e,
if (apType != apNone && apType != apIndex) throw attrError;
if (apType == apNone) {
for (ATermIterator i(es); i; ++i) {
debug(format("evaluating list element"));
startNest(nest, lvlDebug,
format("evaluating list element"));
if (!getDerivation(state, *i, drvs, doneExprs))
getDerivations(state, *i, drvs, doneExprs, attrPathRest);
}
} else {
Expr e2 = ATelementAt(es, attrIndex);
if (!e2) throw Error(format("list index %1% in selection path not found") % attrIndex);
debug(format("evaluating list element"));
startNest(nest, lvlDebug,
format("evaluating list element"));
if (!getDerivation(state, e2, drvs, doneExprs))
getDerivations(state, e2, drvs, doneExprs, attrPathRest);
}