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* Implemented derivations.

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This commit is contained in:
Eelco Dolstra 2010-03-31 15:38:03 +00:00
parent 5187678913
commit 3d94be61ea
6 changed files with 183 additions and 192 deletions
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141
src/libexpr/get-drvs.cc
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@ -6,25 +6,18 @@
namespace nix {
#if 0
string DrvInfo::queryDrvPath(EvalState & state) const
{
if (drvPath == "") {
Expr a = attrs->get(toATerm("drvPath"));
/* Backwards compatibility hack with user environments made by
Nix <= 0.10: these contain illegal Path("") expressions. */
ATerm t;
if (a && matchPath(evalExpr(state, a), t))
return aterm2String(t);
Bindings::iterator i = attrs->find(toATerm("drvPath"));
PathSet context;
(string &) drvPath = a ? coerceToPath(state, a, context) : "";
(string &) drvPath = i != attrs->end() ? state.coerceToPath(i->second, context) : "";
}
return drvPath;
}
#if 0
string DrvInfo::queryOutPath(EvalState & state) const
{
if (outPath == "") {
@ -102,54 +95,47 @@ void DrvInfo::setMetaInfo(const MetaInfo & meta)
}
attrs->set(toATerm("meta"), makeAttrs(metaAttrs));
}
#endif
/* Cache for already evaluated derivations. Usually putting ATerms in
a STL container is unsafe (they're not scanning for GC roots), but
here it doesn't matter; everything in this set is reachable from
the stack as well. */
typedef set<Expr> Exprs;
/* Cache for already considered values. */
typedef set<Value *> Values;
/* 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,
const string & attrPath, DrvInfos & drvs, Exprs & doneExprs)
/* Evaluate value `v'. 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
`v'. */
static bool getDerivation(EvalState & state, Value & v,
const string & attrPath, DrvInfos & drvs, Values & doneValues)
{
try {
ATermList es;
e = evalExpr(state, e);
if (!matchAttrs(e, es)) return true;
state.forceValue(v);
if (v.type != tAttrs) return true;
boost::shared_ptr<ATermMap> attrs(new ATermMap());
queryAllAttrs(e, *attrs, false);
Expr a = attrs->get(toATerm("type"));
if (!a || evalStringNoCtx(state, a) != "derivation") return true;
Bindings::iterator i = v.attrs->find(toATerm("type"));
if (i == v.attrs->end() || state.forceStringNoCtx(i->second) != "derivation") return true;
/* 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);
if (doneValues.find(&v) != doneValues.end()) return false;
doneValues.insert(&v);
DrvInfo drv;
a = attrs->get(toATerm("name"));
i = v.attrs->find(toATerm("name"));
/* !!! We really would like to have a decent back trace here. */
if (!a) throw TypeError("derivation name missing");
drv.name = evalStringNoCtx(state, a);
if (i == v.attrs->end()) throw TypeError("derivation name missing");
drv.name = state.forceStringNoCtx(i->second);
a = attrs->get(toATerm("system"));
if (!a)
i = v.attrs->find(toATerm("system"));
if (i == v.attrs->end())
drv.system = "unknown";
else
drv.system = evalStringNoCtx(state, a);
drv.system = state.forceStringNoCtx(i->second);
drv.attrs = attrs;
drv.attrs = v.attrs;
drv.attrPath = attrPath;
@ -162,11 +148,11 @@ static bool getDerivation(EvalState & state, Expr e,
}
bool getDerivation(EvalState & state, Expr e, DrvInfo & drv)
bool getDerivation(EvalState & state, Value & v, DrvInfo & drv)
{
Exprs doneExprs;
Values doneValues;
DrvInfos drvs;
getDerivation(state, e, "", drvs, doneExprs);
getDerivation(state, v, "", drvs, doneValues);
if (drvs.size() != 1) return false;
drv = drvs.front();
return true;
@ -179,85 +165,72 @@ static string addToPath(const string & s1, const string & s2)
}
static void getDerivations(EvalState & state, Expr e,
static void getDerivations(EvalState & state, Value & v,
const string & pathPrefix, const ATermMap & autoArgs,
DrvInfos & drvs, Exprs & doneExprs)
DrvInfos & drvs, Values & doneValues)
{
e = evalExpr(state, autoCallFunction(evalExpr(state, e), autoArgs));
// !!! autoCallFunction(evalExpr(state, e), autoArgs)
/* Process the expression. */
ATermList es;
DrvInfo drv;
if (!getDerivation(state, e, pathPrefix, drvs, doneExprs))
return;
if (!getDerivation(state, v, pathPrefix, drvs, doneValues)) ;
if (matchAttrs(e, es)) {
ATermMap drvMap(ATgetLength(es));
queryAllAttrs(e, drvMap);
else if (v.type == tAttrs) {
/* !!! undocumented hackery to support combining channels in
nix-env.cc. */
bool combineChannels = drvMap.get(toATerm("_combineChannels"));
bool combineChannels = v.attrs->find(toATerm("_combineChannels")) != v.attrs->end();
/* Consider the attributes in sorted order to get more
deterministic behaviour in nix-env operations (e.g. when
there are names clashes between derivations, the derivation
bound to the attribute with the "lower" name should take
precedence). */
typedef std::map<string, Expr> AttrsSorted;
AttrsSorted attrsSorted;
foreach (ATermMap::const_iterator, i, drvMap)
attrsSorted[aterm2String(i->key)] = i->value;
StringSet attrs;
foreach (Bindings::iterator, i, *v.attrs)
attrs.insert(aterm2String(i->first));
foreach (AttrsSorted::iterator, i, attrsSorted) {
startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % i->first);
string pathPrefix2 = addToPath(pathPrefix, i->first);
foreach (StringSet::iterator, i, attrs) {
startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % *i);
string pathPrefix2 = addToPath(pathPrefix, *i);
Value & v2((*v.attrs)[toATerm(*i)]);
if (combineChannels)
getDerivations(state, i->second, pathPrefix2, autoArgs, drvs, doneExprs);
else if (getDerivation(state, i->second, pathPrefix2, drvs, doneExprs)) {
getDerivations(state, v2, pathPrefix2, autoArgs, drvs, doneValues);
else if (getDerivation(state, v2, pathPrefix2, drvs, doneValues)) {
/* If the value of this attribute is itself an
attribute set, should we recurse into it? => Only
if it has a `recurseForDerivations = true'
attribute. */
ATermList es;
Expr e = evalExpr(state, i->second), e2;
if (matchAttrs(e, es)) {
ATermMap attrs(ATgetLength(es));
queryAllAttrs(e, attrs, false);
if (((e2 = attrs.get(toATerm("recurseForDerivations")))
&& evalBool(state, e2)))
getDerivations(state, e, pathPrefix2, autoArgs, drvs, doneExprs);
if (v2.type == tAttrs) {
Bindings::iterator j = v2.attrs->find(toATerm("recurseForDerivations"));
if (j != v2.attrs->end() && state.forceBool(j->second))
getDerivations(state, v2, pathPrefix2, autoArgs, drvs, doneValues);
}
}
}
return;
}
if (matchList(e, es)) {
int n = 0;
for (ATermIterator i(es); i; ++i, ++n) {
else if (v.type == tList) {
for (unsigned int n = 0; n < v.list.length; ++n) {
startNest(nest, lvlDebug,
format("evaluating list element"));
string pathPrefix2 = addToPath(pathPrefix, (format("%1%") % n).str());
if (getDerivation(state, *i, pathPrefix2, drvs, doneExprs))
getDerivations(state, *i, pathPrefix2, autoArgs, drvs, doneExprs);
if (getDerivation(state, v.list.elems[n], pathPrefix2, drvs, doneValues))
getDerivations(state, v.list.elems[n], pathPrefix2, autoArgs, drvs, doneValues);
}
return;
}
throw TypeError("expression does not evaluate to a derivation (or a set or list of those)");
else throw TypeError("expression does not evaluate to a derivation (or a set or list of those)");
}
void getDerivations(EvalState & state, Expr e, const string & pathPrefix,
void getDerivations(EvalState & state, Value & v, const string & pathPrefix,
const ATermMap & autoArgs, DrvInfos & drvs)
{
Exprs doneExprs;
getDerivations(state, e, pathPrefix, autoArgs, drvs, doneExprs);
Values doneValues;
getDerivations(state, v, pathPrefix, autoArgs, drvs, doneValues);
}
#endif
}