private void collectTransitiveClosure(
PackageProviderForConfigurations packageProvider, Set<Label> reachableLabels, Label from)
throws NoSuchThingException {
if (!reachableLabels.add(from)) {
return;
}
Target fromTarget = packageProvider.getTarget(from);
if (fromTarget instanceof Rule) {
Rule rule = (Rule) fromTarget;
if (rule.getRuleClassObject().hasAttr("srcs", BuildType.LABEL_LIST)) {
// TODO(bazel-team): refine this. This visits "srcs" reachable under *any* configuration,
// not necessarily the configuration actually applied to the rule. We should correlate the
// two. However, doing so requires faithfully reflecting the configuration transitions that
// might happen as we traverse the dependency chain.
// TODO(bazel-team): Why don't we use AbstractAttributeMapper#visitLabels() here?
for (List<Label> labelsForConfiguration :
AggregatingAttributeMapper.of(rule).visitAttribute("srcs", BuildType.LABEL_LIST)) {
for (Label label : labelsForConfiguration) {
collectTransitiveClosure(
packageProvider, reachableLabels, from.resolveRepositoryRelative(label));
}
}
}
if (rule.getRuleClass().equals("bind")) {
Label actual = AggregatingAttributeMapper.of(rule).get("actual", BuildType.LABEL);
if (actual != null) {
collectTransitiveClosure(packageProvider, reachableLabels, actual);
}
}
}
}
/** Adds the given rule to the stack trace of the exception (if there is one). */
private static void addRuleToStackTrace(EvalException ex, Rule rule, BaseFunction ruleImpl) {
if (ex instanceof EvalExceptionWithStackTrace) {
((EvalExceptionWithStackTrace) ex)
.registerPhantomFuncall(
String.format("%s(name = '%s')", rule.getRuleClass(), rule.getName()),
rule.getLocation(),
ruleImpl);
}
}
/**
* Uses a remote repository name to fetch the corresponding Rule describing how to get it. This
* should be called from {@link SkyFunction#compute} functions, which should return null if this
* returns null. If {@code ruleClassName} is set, the rule found must have a matching rule class
* name.
*/
@Nullable
public static Rule getRule(
RepositoryName repositoryName, @Nullable String ruleClassName, Environment env)
throws RepositoryFunctionException {
ExternalPackage externalPackage = getExternalPackage(env);
if (externalPackage == null) {
return null;
}
Rule rule = externalPackage.getRepositoryInfo(repositoryName);
if (rule == null) {
throw new RepositoryFunctionException(
new BuildFileContainsErrorsException(
ExternalPackage.PACKAGE_IDENTIFIER,
"The repository named '" + repositoryName + "' could not be resolved"),
Transience.PERSISTENT);
}
Preconditions.checkState(
ruleClassName == null || rule.getRuleClass().equals(ruleClassName),
"Got %s, was expecting a %s",
rule,
ruleClassName);
return rule;
}