Update from Google.
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MOE_MIGRATED_REVID=85702957
diff --git a/src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java b/src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java
new file mode 100644
index 0000000..80df9e2
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/actions/ParameterFile.java
@@ -0,0 +1,114 @@
+// Copyright 2014 Google Inc. 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.actions;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import com.google.devtools.build.lib.util.FileType;
+import com.google.devtools.build.lib.util.ShellEscaper;
+import com.google.devtools.build.lib.vfs.FileSystemUtils;
+import com.google.devtools.build.lib.vfs.Path;
+import com.google.devtools.build.lib.vfs.PathFragment;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.util.List;
+
+/**
+ * Support for parameter file generation (as used by gcc and other tools, e.g.
+ * {@code gcc @param_file}. Note that the parameter file needs to be explicitly
+ * deleted after use. Different tools require different parameter file formats,
+ * which can be selected via the {@link ParameterFileType} enum.
+ *
+ * <p>The default charset is ISO-8859-1 (latin1). This also has to match the
+ * expectation of the tool.
+ *
+ * <p>Don't use this class for new code. Use the ParameterFileWriteAction
+ * instead!
+ */
+public class ParameterFile {
+
+ /**
+ * Different styles of parameter files.
+ */
+ public static enum ParameterFileType {
+ /**
+ * A parameter file with every parameter on a separate line. This format
+ * cannot handle newlines in parameters. It is currently used for most
+ * tools, but may not be interpreted correctly if parameters contain
+ * white space or other special characters. It should be avoided for new
+ * development.
+ */
+ UNQUOTED,
+
+ /**
+ * A parameter file where each parameter is correctly quoted for shell
+ * use, and separated by white space (space, tab, newline). This format is
+ * safe for all characters, but must be specially supported by the tool. In
+ * particular, it must not be used with gcc and related tools, which do not
+ * support this format as it is.
+ */
+ SHELL_QUOTED;
+ }
+
+ // Parameter file location.
+ private final Path execRoot;
+ private final PathFragment execPath;
+ private final Charset charset;
+ private final ParameterFileType type;
+
+ @VisibleForTesting
+ public static final FileType PARAMETER_FILE = FileType.of(".params");
+
+ /**
+ * Creates a parameter file with the given parameters.
+ */
+ public ParameterFile(Path execRoot, PathFragment execPath, Charset charset,
+ ParameterFileType type) {
+ Preconditions.checkNotNull(type);
+ this.execRoot = execRoot;
+ this.execPath = execPath;
+ this.charset = Preconditions.checkNotNull(charset);
+ this.type = Preconditions.checkNotNull(type);
+ }
+
+ /**
+ * Derives an exec path from a given exec path by appending <code>".params"</code>.
+ */
+ public static PathFragment derivePath(PathFragment original) {
+ return original.replaceName(original.getBaseName() + "-2.params");
+ }
+
+ /**
+ * Returns the path for the parameter file.
+ */
+ public Path getPath() {
+ return execRoot.getRelative(execPath);
+ }
+
+ /**
+ * Writes the arguments from the list into the parameter file according to
+ * the style selected in the constructor.
+ */
+ public void writeContent(List<String> arguments) throws ExecException {
+ Iterable<String> actualArgs = (type == ParameterFileType.SHELL_QUOTED) ?
+ ShellEscaper.escapeAll(arguments) : arguments;
+ Path file = getPath();
+ try {
+ FileSystemUtils.writeLinesAs(file, charset, actualArgs);
+ } catch (IOException e) {
+ throw new EnvironmentalExecException("could not write param file '" + file + "'", e);
+ }
+ }
+}
