forked from lix-project/lix
380 lines
12 KiB
C++
380 lines
12 KiB
C++
#include "get-drvs.hh"
|
||
#include "util.hh"
|
||
#include "eval-inline.hh"
|
||
#include "store-api.hh"
|
||
|
||
#include <cstring>
|
||
#include <regex>
|
||
|
||
|
||
namespace nix {
|
||
|
||
|
||
DrvInfo::DrvInfo(EvalState & state, const string & attrPath, Bindings * attrs)
|
||
: state(&state), attrs(attrs), attrPath(attrPath)
|
||
{
|
||
}
|
||
|
||
|
||
DrvInfo::DrvInfo(EvalState & state, ref<Store> store, const std::string & drvPathWithOutputs)
|
||
: state(&state), attrs(nullptr), attrPath("")
|
||
{
|
||
auto [drvPath, selectedOutputs] = store->parsePathWithOutputs(drvPathWithOutputs);
|
||
|
||
this->drvPath = store->printStorePath(drvPath);
|
||
|
||
auto drv = store->derivationFromPath(drvPath);
|
||
|
||
name = drvPath.name();
|
||
|
||
if (selectedOutputs.size() > 1)
|
||
throw Error("building more than one derivation output is not supported, in '%s'", drvPathWithOutputs);
|
||
|
||
outputName =
|
||
selectedOutputs.empty()
|
||
? get(drv.env, "outputName").value_or("out")
|
||
: *selectedOutputs.begin();
|
||
|
||
auto i = drv.outputs.find(outputName);
|
||
if (i == drv.outputs.end())
|
||
throw Error("derivation '%s' does not have output '%s'", store->printStorePath(drvPath), outputName);
|
||
|
||
outPath = store->printStorePath(i->second.path);
|
||
}
|
||
|
||
|
||
string DrvInfo::queryName() const
|
||
{
|
||
if (name == "" && attrs) {
|
||
auto i = attrs->find(state->sName);
|
||
if (i == attrs->end()) throw TypeError("derivation name missing");
|
||
name = state->forceStringNoCtx(*i->value);
|
||
}
|
||
return name;
|
||
}
|
||
|
||
|
||
string DrvInfo::querySystem() const
|
||
{
|
||
if (system == "" && attrs) {
|
||
auto i = attrs->find(state->sSystem);
|
||
system = i == attrs->end() ? "unknown" : state->forceStringNoCtx(*i->value, *i->pos);
|
||
}
|
||
return system;
|
||
}
|
||
|
||
|
||
string DrvInfo::queryDrvPath() const
|
||
{
|
||
if (drvPath == "" && attrs) {
|
||
Bindings::iterator i = attrs->find(state->sDrvPath);
|
||
PathSet context;
|
||
drvPath = i != attrs->end() ? state->coerceToPath(*i->pos, *i->value, context) : "";
|
||
}
|
||
return drvPath;
|
||
}
|
||
|
||
|
||
string DrvInfo::queryOutPath() const
|
||
{
|
||
if (outPath == "" && attrs) {
|
||
Bindings::iterator i = attrs->find(state->sOutPath);
|
||
PathSet context;
|
||
outPath = i != attrs->end() ? state->coerceToPath(*i->pos, *i->value, context) : "";
|
||
}
|
||
return outPath;
|
||
}
|
||
|
||
|
||
DrvInfo::Outputs DrvInfo::queryOutputs(bool onlyOutputsToInstall)
|
||
{
|
||
if (outputs.empty()) {
|
||
/* Get the ‘outputs’ list. */
|
||
Bindings::iterator i;
|
||
if (attrs && (i = attrs->find(state->sOutputs)) != attrs->end()) {
|
||
state->forceList(*i->value, *i->pos);
|
||
|
||
/* For each output... */
|
||
for (unsigned int j = 0; j < i->value->listSize(); ++j) {
|
||
/* Evaluate the corresponding set. */
|
||
string name = state->forceStringNoCtx(*i->value->listElems()[j], *i->pos);
|
||
Bindings::iterator out = attrs->find(state->symbols.create(name));
|
||
if (out == attrs->end()) continue; // FIXME: throw error?
|
||
state->forceAttrs(*out->value);
|
||
|
||
/* And evaluate its ‘outPath’ attribute. */
|
||
Bindings::iterator outPath = out->value->attrs->find(state->sOutPath);
|
||
if (outPath == out->value->attrs->end()) continue; // FIXME: throw error?
|
||
PathSet context;
|
||
outputs[name] = state->coerceToPath(*outPath->pos, *outPath->value, context);
|
||
}
|
||
} else
|
||
outputs["out"] = queryOutPath();
|
||
}
|
||
if (!onlyOutputsToInstall || !attrs)
|
||
return outputs;
|
||
|
||
/* Check for `meta.outputsToInstall` and return `outputs` reduced to that. */
|
||
const Value * outTI = queryMeta("outputsToInstall");
|
||
if (!outTI) return outputs;
|
||
const auto errMsg = Error("this derivation has bad 'meta.outputsToInstall'");
|
||
/* ^ this shows during `nix-env -i` right under the bad derivation */
|
||
if (!outTI->isList()) throw errMsg;
|
||
Outputs result;
|
||
for (auto i = outTI->listElems(); i != outTI->listElems() + outTI->listSize(); ++i) {
|
||
if ((*i)->type != tString) throw errMsg;
|
||
auto out = outputs.find((*i)->string.s);
|
||
if (out == outputs.end()) throw errMsg;
|
||
result.insert(*out);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
|
||
string DrvInfo::queryOutputName() const
|
||
{
|
||
if (outputName == "" && attrs) {
|
||
Bindings::iterator i = attrs->find(state->sOutputName);
|
||
outputName = i != attrs->end() ? state->forceStringNoCtx(*i->value) : "";
|
||
}
|
||
return outputName;
|
||
}
|
||
|
||
|
||
Bindings * DrvInfo::getMeta()
|
||
{
|
||
if (meta) return meta;
|
||
if (!attrs) return 0;
|
||
Bindings::iterator a = attrs->find(state->sMeta);
|
||
if (a == attrs->end()) return 0;
|
||
state->forceAttrs(*a->value, *a->pos);
|
||
meta = a->value->attrs;
|
||
return meta;
|
||
}
|
||
|
||
|
||
StringSet DrvInfo::queryMetaNames()
|
||
{
|
||
StringSet res;
|
||
if (!getMeta()) return res;
|
||
for (auto & i : *meta)
|
||
res.insert(i.name);
|
||
return res;
|
||
}
|
||
|
||
|
||
bool DrvInfo::checkMeta(Value & v)
|
||
{
|
||
state->forceValue(v);
|
||
if (v.isList()) {
|
||
for (unsigned int n = 0; n < v.listSize(); ++n)
|
||
if (!checkMeta(*v.listElems()[n])) return false;
|
||
return true;
|
||
}
|
||
else if (v.type == tAttrs) {
|
||
Bindings::iterator i = v.attrs->find(state->sOutPath);
|
||
if (i != v.attrs->end()) return false;
|
||
for (auto & i : *v.attrs)
|
||
if (!checkMeta(*i.value)) return false;
|
||
return true;
|
||
}
|
||
else return v.type == tInt || v.type == tBool || v.type == tString ||
|
||
v.type == tFloat;
|
||
}
|
||
|
||
|
||
Value * DrvInfo::queryMeta(const string & name)
|
||
{
|
||
if (!getMeta()) return 0;
|
||
Bindings::iterator a = meta->find(state->symbols.create(name));
|
||
if (a == meta->end() || !checkMeta(*a->value)) return 0;
|
||
return a->value;
|
||
}
|
||
|
||
|
||
string DrvInfo::queryMetaString(const string & name)
|
||
{
|
||
Value * v = queryMeta(name);
|
||
if (!v || v->type != tString) return "";
|
||
return v->string.s;
|
||
}
|
||
|
||
|
||
NixInt DrvInfo::queryMetaInt(const string & name, NixInt def)
|
||
{
|
||
Value * v = queryMeta(name);
|
||
if (!v) return def;
|
||
if (v->type == tInt) return v->integer;
|
||
if (v->type == tString) {
|
||
/* Backwards compatibility with before we had support for
|
||
integer meta fields. */
|
||
NixInt n;
|
||
if (string2Int(v->string.s, n)) return n;
|
||
}
|
||
return def;
|
||
}
|
||
|
||
NixFloat DrvInfo::queryMetaFloat(const string & name, NixFloat def)
|
||
{
|
||
Value * v = queryMeta(name);
|
||
if (!v) return def;
|
||
if (v->type == tFloat) return v->fpoint;
|
||
if (v->type == tString) {
|
||
/* Backwards compatibility with before we had support for
|
||
float meta fields. */
|
||
NixFloat n;
|
||
if (string2Float(v->string.s, n)) return n;
|
||
}
|
||
return def;
|
||
}
|
||
|
||
|
||
bool DrvInfo::queryMetaBool(const string & name, bool def)
|
||
{
|
||
Value * v = queryMeta(name);
|
||
if (!v) return def;
|
||
if (v->type == tBool) return v->boolean;
|
||
if (v->type == tString) {
|
||
/* Backwards compatibility with before we had support for
|
||
Boolean meta fields. */
|
||
if (strcmp(v->string.s, "true") == 0) return true;
|
||
if (strcmp(v->string.s, "false") == 0) return false;
|
||
}
|
||
return def;
|
||
}
|
||
|
||
|
||
void DrvInfo::setMeta(const string & name, Value * v)
|
||
{
|
||
getMeta();
|
||
Bindings * old = meta;
|
||
meta = state->allocBindings(1 + (old ? old->size() : 0));
|
||
Symbol sym = state->symbols.create(name);
|
||
if (old)
|
||
for (auto i : *old)
|
||
if (i.name != sym)
|
||
meta->push_back(i);
|
||
if (v) meta->push_back(Attr(sym, v));
|
||
meta->sort();
|
||
}
|
||
|
||
|
||
/* Cache for already considered attrsets. */
|
||
typedef set<Bindings *> Done;
|
||
|
||
|
||
/* Evaluate value `v'. If it evaluates to a set of type `derivation',
|
||
then put information about it in `drvs' (unless it's already in `done').
|
||
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, Done & done,
|
||
bool ignoreAssertionFailures)
|
||
{
|
||
try {
|
||
state.forceValue(v);
|
||
if (!state.isDerivation(v)) return true;
|
||
|
||
/* Remove spurious duplicates (e.g., a set like `rec { x =
|
||
derivation {...}; y = x;}'. */
|
||
if (!done.insert(v.attrs).second) return false;
|
||
|
||
DrvInfo drv(state, attrPath, v.attrs);
|
||
|
||
drv.queryName();
|
||
|
||
drvs.push_back(drv);
|
||
|
||
return false;
|
||
|
||
} catch (AssertionError & e) {
|
||
if (ignoreAssertionFailures) return false;
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
std::optional<DrvInfo> getDerivation(EvalState & state, Value & v,
|
||
bool ignoreAssertionFailures)
|
||
{
|
||
Done done;
|
||
DrvInfos drvs;
|
||
getDerivation(state, v, "", drvs, done, ignoreAssertionFailures);
|
||
if (drvs.size() != 1) return {};
|
||
return std::move(drvs.front());
|
||
}
|
||
|
||
|
||
static string addToPath(const string & s1, const string & s2)
|
||
{
|
||
return s1.empty() ? s2 : s1 + "." + s2;
|
||
}
|
||
|
||
|
||
static std::regex attrRegex("[A-Za-z_][A-Za-z0-9-_+]*");
|
||
|
||
|
||
static void getDerivations(EvalState & state, Value & vIn,
|
||
const string & pathPrefix, Bindings & autoArgs,
|
||
DrvInfos & drvs, Done & done,
|
||
bool ignoreAssertionFailures)
|
||
{
|
||
Value v;
|
||
state.autoCallFunction(autoArgs, vIn, v);
|
||
|
||
/* Process the expression. */
|
||
if (!getDerivation(state, v, pathPrefix, drvs, done, ignoreAssertionFailures)) ;
|
||
|
||
else if (v.type == tAttrs) {
|
||
|
||
/* !!! undocumented hackery to support combining channels in
|
||
nix-env.cc. */
|
||
bool combineChannels = v.attrs->find(state.symbols.create("_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). */
|
||
for (auto & i : v.attrs->lexicographicOrder()) {
|
||
debug("evaluating attribute '%1%'", i->name);
|
||
if (!std::regex_match(std::string(i->name), attrRegex))
|
||
continue;
|
||
string pathPrefix2 = addToPath(pathPrefix, i->name);
|
||
if (combineChannels)
|
||
getDerivations(state, *i->value, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
|
||
else if (getDerivation(state, *i->value, pathPrefix2, drvs, done, ignoreAssertionFailures)) {
|
||
/* If the value of this attribute is itself a set,
|
||
should we recurse into it? => Only if it has a
|
||
`recurseForDerivations = true' attribute. */
|
||
if (i->value->type == tAttrs) {
|
||
Bindings::iterator j = i->value->attrs->find(state.sRecurseForDerivations);
|
||
if (j != i->value->attrs->end() && state.forceBool(*j->value, *j->pos))
|
||
getDerivations(state, *i->value, pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
else if (v.isList()) {
|
||
for (unsigned int n = 0; n < v.listSize(); ++n) {
|
||
string pathPrefix2 = addToPath(pathPrefix, (format("%1%") % n).str());
|
||
if (getDerivation(state, *v.listElems()[n], pathPrefix2, drvs, done, ignoreAssertionFailures))
|
||
getDerivations(state, *v.listElems()[n], pathPrefix2, autoArgs, drvs, done, ignoreAssertionFailures);
|
||
}
|
||
}
|
||
|
||
else throw TypeError("expression does not evaluate to a derivation (or a set or list of those)");
|
||
}
|
||
|
||
|
||
void getDerivations(EvalState & state, Value & v, const string & pathPrefix,
|
||
Bindings & autoArgs, DrvInfos & drvs, bool ignoreAssertionFailures)
|
||
{
|
||
Done done;
|
||
getDerivations(state, v, pathPrefix, autoArgs, drvs, done, ignoreAssertionFailures);
|
||
}
|
||
|
||
|
||
}
|