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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.analysis;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.vfs.PathFragment;
/** Class to work with the shell toolchain, e.g. get the shell interpreter's path. */
public final class ShToolchain {
/**
* Returns the shell executable's path, or an empty path if not set.
*
* <p>This method checks the configuration's {@link ShellConfiguration} fragment.
*/
public static PathFragment getPath(BuildConfiguration config) {
PathFragment result = PathFragment.EMPTY_FRAGMENT;
ShellConfiguration configFragment =
(ShellConfiguration) config.getFragment(ShellConfiguration.class);
if (configFragment != null) {
PathFragment path = configFragment.getShellExecutable();
if (path != null) {
result = path;
}
}
return result;
}
/**
* Returns the shell executable's path, or reports a rule error if the path is empty.
*
* <p>This method checks the rule's configuration's {@link ShellConfiguration} fragment for the
* shell executable's path. If null or empty, the method reports an error against the rule.
*/
public static PathFragment getPathOrError(RuleContext ctx) {
PathFragment result = getPath(ctx.getConfiguration());
if (result.isEmpty()) {
ctx.ruleError(
"This rule needs a shell interpreter. Use the --shell_executable=<path> flag to specify"
+ " the interpreter's path, e.g. --shell_executable=/usr/local/bin/bash");
}
return result;
}
private ShToolchain() {}
}
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