lix-releng-staging/src/libexpr/primops.cc

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#include "primops.hh"
#include "normalise.hh"
#include "globals.hh"
Expr primImport(EvalState & state, Expr arg)
{
ATMatcher m;
string path;
if (!(atMatch(m, arg) >> "Path" >> path))
throw badTerm("path expected", arg);
return evalFile(state, path);
}
static PathSet storeExprRootsCached(EvalState & state, const Path & nePath)
{
DrvPaths::iterator i = state.drvPaths.find(nePath);
if (i != state.drvPaths.end())
return i->second;
else {
PathSet paths = storeExprRoots(nePath);
state.drvPaths[nePath] = paths;
return paths;
}
}
static Hash hashDerivation(EvalState & state, StoreExpr ne)
{
if (ne.type == StoreExpr::neDerivation) {
PathSet inputs2;
for (PathSet::iterator i = ne.derivation.inputs.begin();
i != ne.derivation.inputs.end(); i++)
{
DrvHashes::iterator j = state.drvHashes.find(*i);
if (j == state.drvHashes.end())
throw Error(format("don't know expression `%1%'") % (string) *i);
inputs2.insert(j->second);
}
ne.derivation.inputs = inputs2;
}
return hashTerm(unparseStoreExpr(ne));
}
static Path copyAtom(EvalState & state, const Path & srcPath)
{
/* !!! should be cached */
Path dstPath(addToStore(srcPath));
ClosureElem elem;
StoreExpr ne;
ne.type = StoreExpr::neClosure;
ne.closure.roots.insert(dstPath);
ne.closure.elems[dstPath] = elem;
Hash drvHash = hashDerivation(state, ne);
Path drvPath = writeTerm(unparseStoreExpr(ne), "");
state.drvHashes[drvPath] = drvHash;
printMsg(lvlChatty, format("copied `%1%' -> closure `%2%'")
% srcPath % drvPath);
return drvPath;
}
static string addInput(EvalState & state,
Path & nePath, StoreExpr & ne)
{
PathSet paths = storeExprRootsCached(state, nePath);
if (paths.size() != 1) abort();
Path path = *(paths.begin());
ne.derivation.inputs.insert(nePath);
return path;
}
static void processBinding(EvalState & state, Expr e, StoreExpr & ne,
Strings & ss)
{
e = evalExpr(state, e);
ATMatcher m;
string s;
ATermList es;
int n;
Expr e1, e2;
if (atMatch(m, e) >> "Str" >> s) ss.push_back(s);
else if (atMatch(m, e) >> "Uri" >> s) ss.push_back(s);
else if (atMatch(m, e) >> "Bool" >> "True") ss.push_back("1");
else if (atMatch(m, e) >> "Bool" >> "False") ss.push_back("");
else if (atMatch(m, e) >> "Int" >> n) {
ostringstream st;
st << n;
ss.push_back(st.str());
}
else if (atMatch(m, e) >> "Attrs") {
Expr a = queryAttr(e, "type");
if (a && evalString(state, a) == "derivation") {
a = queryAttr(e, "drvPath");
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if (!a) throw badTerm("derivation name missing", e);
Path drvPath = evalPath(state, a);
a = queryAttr(e, "drvHash");
if (!a) throw badTerm("derivation hash missing", e);
Hash drvHash = parseHash(evalString(state, a));
state.drvHashes[drvPath] = drvHash;
ss.push_back(addInput(state, drvPath, ne));
} else
throw badTerm("invalid derivation binding", e);
}
else if (atMatch(m, e) >> "Path" >> s) {
Path drvPath = copyAtom(state, s);
ss.push_back(addInput(state, drvPath, ne));
}
else if (atMatch(m, e) >> "List" >> es) {
for (ATermIterator i(es); i; ++i) {
startNest(nest, lvlVomit, format("processing list element"));
processBinding(state, evalExpr(state, *i), ne, ss);
}
}
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else if (atMatch(m, e) >> "Null") ss.push_back("");
else if (atMatch(m, e) >> "SubPath" >> e1 >> e2) {
Strings ss2;
processBinding(state, evalExpr(state, e1), ne, ss2);
if (ss2.size() != 1)
throw Error("left-hand side of `~' operator cannot be a list");
e2 = evalExpr(state, e2);
if (!(atMatch(m, e2) >> "Str" >> s ||
(atMatch(m, e2) >> "Path" >> s)))
throw Error("right-hand side of `~' operator must be a path or string");
ss.push_back(canonPath(ss2.front() + "/" + s));
}
else throw badTerm("invalid derivation binding", e);
}
static string concatStrings(const Strings & ss)
{
string s;
bool first = true;
for (Strings::const_iterator i = ss.begin(); i != ss.end(); ++i) {
if (!first) s += " "; else first = false;
s += *i;
}
return s;
}
Expr primDerivation(EvalState & state, Expr args)
{
startNest(nest, lvlVomit, "evaluating derivation");
ATermMap attrs;
args = evalExpr(state, args);
queryAllAttrs(args, attrs);
/* Build the derivation expression by processing the attributes. */
StoreExpr ne;
ne.type = StoreExpr::neDerivation;
string drvName;
Path outPath;
Hash outHash;
bool outHashGiven = false;
for (ATermIterator i(attrs.keys()); i; ++i) {
string key = aterm2String(*i);
Expr value = attrs.get(key);
startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
Strings ss;
try {
processBinding(state, value, ne, ss);
} catch (Error & e) {
throw Error(format("while processing derivation binding `%1%': %2%")
% key % e.msg());
}
/* The `args' attribute is special: it supplies the
command-line arguments to the builder. */
if (key == "args") {
for (Strings::iterator i = ss.begin(); i != ss.end(); ++i)
ne.derivation.args.push_back(*i);
}
/* All other attributes are passed to the builder through the
environment. */
else {
string s = concatStrings(ss);
ne.derivation.env[key] = s;
if (key == "builder") ne.derivation.builder = s;
else if (key == "system") ne.derivation.platform = s;
else if (key == "name") drvName = s;
else if (key == "outPath") outPath = s;
else if (key == "id") {
outHash = parseHash(s);
outHashGiven = true;
}
}
}
/* Do we have all required attributes? */
if (ne.derivation.builder == "")
throw badTerm("required attribute `builder' missing", args);
if (ne.derivation.platform == "")
throw badTerm("required attribute `system' missing", args);
if (drvName == "")
throw badTerm("required attribute `name' missing", args);
/* Determine the output path. */
if (!outHashGiven) outHash = hashDerivation(state, ne);
if (outPath == "")
/* Hash the Nix expression with no outputs to produce a
unique but deterministic path name for this derivation. */
outPath = canonPath(nixStore + "/" +
((string) outHash).c_str() + "-" + drvName);
ne.derivation.env["out"] = outPath;
ne.derivation.outputs.insert(outPath);
/* Write the resulting term into the Nix store directory. */
Hash drvHash = outHashGiven
? hashString((string) outHash + outPath)
: hashDerivation(state, ne);
Path drvPath = writeTerm(unparseStoreExpr(ne), "-d-" + drvName);
printMsg(lvlChatty, format("instantiated `%1%' -> `%2%'")
% drvName % drvPath);
attrs.set("outPath", ATmake("Path(<str>)", outPath.c_str()));
attrs.set("drvPath", ATmake("Path(<str>)", drvPath.c_str()));
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attrs.set("drvHash", ATmake("Str(<str>)", ((string) drvHash).c_str()));
attrs.set("type", ATmake("Str(\"derivation\")"));
return makeAttrs(attrs);
}
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Expr primBaseNameOf(EvalState & state, Expr arg)
{
string s = evalString(state, arg);
return ATmake("Str(<str>)", baseNameOf(s).c_str());
}
Expr primToString(EvalState & state, Expr arg)
{
arg = evalExpr(state, arg);
ATMatcher m;
string s;
if (atMatch(m, arg) >> "Str" >> s ||
atMatch(m, arg) >> "Path" >> s ||
atMatch(m, arg) >> "Uri" >> s)
return ATmake("Str(<str>)", s.c_str());
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else throw badTerm("cannot coerce to string", arg);
}
Expr primTrue(EvalState & state)
{
return ATmake("Bool(True)");
}
Expr primFalse(EvalState & state)
{
return ATmake("Bool(False)");
}
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Expr primNull(EvalState & state)
{
return ATmake("Null");
}
Expr primIsNull(EvalState & state, Expr arg)
{
arg = evalExpr(state, arg);
ATMatcher m;
return makeBool(atMatch(m, arg) >> "Null");
}