@Nullable
public static ExternalPackage getExternalPackage(Environment env)
throws RepositoryFunctionException {
SkyKey packageKey = PackageValue.key(ExternalPackage.PACKAGE_IDENTIFIER);
PackageValue packageValue;
try {
packageValue = (PackageValue) env.getValueOrThrow(packageKey, NoSuchPackageException.class);
} catch (NoSuchPackageException e) {
throw new RepositoryFunctionException(
new BuildFileNotFoundException(
ExternalPackage.PACKAGE_IDENTIFIER, "Could not load //external package"),
Transience.PERSISTENT);
}
if (packageValue == null) {
return null;
}
ExternalPackage externalPackage = (ExternalPackage) packageValue.getPackage();
if (externalPackage.containsErrors()) {
throw new RepositoryFunctionException(
new BuildFileContainsErrorsException(
ExternalPackage.PACKAGE_IDENTIFIER, "Could not load //external package"),
Transience.PERSISTENT);
}
return externalPackage;
}
/**
* 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;
}