Add support for outputting dependency manifest files, used by ninja and make

Use --manifest-file=somefile.d to output the dependency manifest.
This file will contain a list of files which were read by protoc as part
of creating the output files.  It doesn't include the plugin inputs if
plugins are used, that could be a later extension.
The manifest file is in the format <output file>: <input files>.  The
manifest file format only allows you to specify one output file, which
isn't a problem as it's used to detect input changes in order to detect
when to rerun the protoc command.  The output file used in the manifest
is the manifest filename itself; to use this in ninja you should declare
the manifest file as the first output as well as the depfile input.

src/google/protobuf/compiler/command_line_interface.cc

@@ -46,6 +46,7 @@
 #endif
 #include <errno.h>
 #include <iostream>
+#include <sstream>
 #include <ctype.h>
 
 #include <google/protobuf/stubs/hash.h>
@@ -725,6 +726,12 @@ int CommandLineInterface::Run(int argc, const char* const argv[]) {
     }
   }
 
+  if (!manifest_name_.empty()) {
+    if (!GenerateDependencyManifestFile(parsed_files, &source_tree)) {
+      return 1;
+    }
+  }
+
   if (mode_ == MODE_ENCODE || mode_ == MODE_DECODE) {
     if (codec_type_.empty()) {
       // HACK:  Define an EmptyMessage type to use for decoding.
@@ -775,6 +782,7 @@ void CommandLineInterface::Clear() {
   output_directives_.clear();
   codec_type_.clear();
   descriptor_set_name_.clear();
+  manifest_name_.clear();
 
   mode_ = MODE_COMPILE;
   print_mode_ = PRINT_NONE;
@@ -1012,6 +1020,22 @@ CommandLineInterface::InterpretArgument(const string& name,
     }
     descriptor_set_name_ = value;
 
+  } else if (name == "--manifest-file") {
+    if (!manifest_name_.empty()) {
+      cerr << name << " may only be passed once." << endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+    if (value.empty()) {
+      cerr << name << " requires a non-empty value." << endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+    if (mode_ != MODE_COMPILE) {
+      cerr << "Cannot use --encode or --decode and generate a manifest at the "
+              "same time." << endl;
+      return PARSE_ARGUMENT_FAIL;
+    }
+    manifest_name_ = value;
+
   } else if (name == "--include_imports") {
     if (imports_in_descriptor_set_) {
       cerr << name << " may only be passed once." << endl;
@@ -1206,6 +1230,9 @@ void CommandLineInterface::PrintHelpText() {
 "                              include information about the original\n"
 "                              location of each decl in the source file as\n"
 "                              well as surrounding comments.\n"
+"  --manifest_file=FILE        Write a dependency output file in the format\n"
+"                              expected by make. This writes the transitive\n"
+"                              set of input file paths to FILE\n"
 "  --error_format=FORMAT       Set the format in which to print errors.\n"
 "                              FORMAT may be 'gcc' (the default) or 'msvs'\n"
 "                              (Microsoft Visual Studio format).\n"
@@ -1282,6 +1309,62 @@ bool CommandLineInterface::GenerateOutput(
   return true;
 }
 
+bool CommandLineInterface::GenerateDependencyManifestFile(
+    const vector<const FileDescriptor*> parsed_files,
+    DiskSourceTree * source_tree) {
+  FileDescriptorSet file_set;
+
+  set<const FileDescriptor*> already_seen;
+  for (int i = 0; i < parsed_files.size(); i++) {
+    GetTransitiveDependencies(parsed_files[i],
+                              false,
+                              &already_seen, file_set.mutable_file());
+  }
+
+  int fd;
+  do {
+    fd = open(manifest_name_.c_str(),
+              O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0666);
+  } while (fd < 0 && errno == EINTR);
+
+  if (fd < 0) {
+    perror(manifest_name_.c_str());
+    return false;
+  }
+
+  stringstream ss;
+  string output_filename = manifest_name_;
+  if (output_filename.compare(0, 2, "./") == 0) {
+    output_filename = output_filename.substr(2);
+  }
+  ss << output_filename << ": ";
+  for (set<const FileDescriptor*>::const_iterator it = already_seen.begin(); it != already_seen.end(); ++it ) {
+    string virtual_file = (*it)->name();
+    string disk_file;
+    if (source_tree && source_tree->VirtualFileToDiskFile(virtual_file, &disk_file) ) {
+      ss << " " << disk_file << " \\" << endl;
+    } else {
+      cerr << "Unable to identify path for file " << virtual_file << endl;
+      return false;
+    }
+  }
+  
+  string manifest_contents = ss.str();
+  if ( write(fd, manifest_contents.c_str(), manifest_contents.size()) != manifest_contents.size() ) {
+    cerr << "Error when writing to " << manifest_name_ << endl;
+    return false;
+  }
+
+  int rv = ::close(fd);
+  if ( rv != 0 ) {
+    cerr << manifest_name_ << ": " << strerror(rv) << endl;
+    return false;
+  }
+
+  return true;
+}
+
+
 bool CommandLineInterface::GeneratePluginOutput(
     const vector<const FileDescriptor*>& parsed_files,
     const string& plugin_name,

src/google/protobuf/compiler/command_line_interface.h

@@ -247,6 +247,11 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // Implements the --descriptor_set_out option.
   bool WriteDescriptorSet(const vector<const FileDescriptor*> parsed_files);
 
+  // Implements the --manifest-file option
+  bool GenerateDependencyManifestFile(
+      const vector<const FileDescriptor*> parsed_files,
+      DiskSourceTree * source_tree);
+
   // Get all transitive dependencies of the given file (including the file
   // itself), adding them to the given list of FileDescriptorProtos.  The
   // protos will be ordered such that every file is listed before any file that
@@ -353,6 +358,10 @@ class LIBPROTOC_EXPORT CommandLineInterface {
   // FileDescriptorSet should be written.  Otherwise, empty.
   string descriptor_set_name_;
 
+  // If --manifest_file was given, this is the filename to which the input
+  // file should be written.  Otherwise, empty.
+  string manifest_name_;
+
   // True if --include_imports was given, meaning that we should
   // write all transitive dependencies to the DescriptorSet.  Otherwise, only
   // the .proto files listed on the command-line are added.

test-driver

+#! /bin/sh
+# test-driver - basic testsuite driver script.
+
+scriptversion=2012-06-27.10; # UTC
+
+# Copyright (C) 2011-2013 Free Software Foundation, Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# This file is maintained in Automake, please report
+# bugs to <bug-automake@gnu.org> or send patches to
+# <automake-patches@gnu.org>.
+
+# Make unconditional expansion of undefined variables an error.  This
+# helps a lot in preventing typo-related bugs.
+set -u
+
+usage_error ()
+{
+  echo "$0: $*" >&2
+  print_usage >&2
+  exit 2
+}
+
+print_usage ()
+{
+  cat <<END
+Usage:
+  test-driver --test-name=NAME --log-file=PATH --trs-file=PATH
+              [--expect-failure={yes|no}] [--color-tests={yes|no}]
+              [--enable-hard-errors={yes|no}] [--] TEST-SCRIPT
+The '--test-name', '--log-file' and '--trs-file' options are mandatory.
+END
+}
+
+# TODO: better error handling in option parsing (in particular, ensure
+# TODO: $log_file, $trs_file and $test_name are defined).
+test_name= # Used for reporting.
+log_file=  # Where to save the output of the test script.
+trs_file=  # Where to save the metadata of the test run.
+expect_failure=no
+color_tests=no
+enable_hard_errors=yes
+while test $# -gt 0; do
+  case $1 in
+  --help) print_usage; exit $?;;
+  --version) echo "test-driver $scriptversion"; exit $?;;
+  --test-name) test_name=$2; shift;;
+  --log-file) log_file=$2; shift;;
+  --trs-file) trs_file=$2; shift;;
+  --color-tests) color_tests=$2; shift;;
+  --expect-failure) expect_failure=$2; shift;;
+  --enable-hard-errors) enable_hard_errors=$2; shift;;
+  --) shift; break;;
+  -*) usage_error "invalid option: '$1'";;
+  esac
+  shift
+done
+
+if test $color_tests = yes; then
+  # Keep this in sync with 'lib/am/check.am:$(am__tty_colors)'.
+  red='' # Red.
+  grn='' # Green.
+  lgn='' # Light green.
+  blu='' # Blue.
+  mgn='' # Magenta.
+  std=''     # No color.
+else
+  red= grn= lgn= blu= mgn= std=
+fi
+
+do_exit='rm -f $log_file $trs_file; (exit $st); exit $st'
+trap "st=129; $do_exit" 1
+trap "st=130; $do_exit" 2
+trap "st=141; $do_exit" 13
+trap "st=143; $do_exit" 15
+
+# Test script is run here.
+"$@" >$log_file 2>&1
+estatus=$?
+if test $enable_hard_errors = no && test $estatus -eq 99; then
+  estatus=1
+fi
+
+case $estatus:$expect_failure in
+  0:yes) col=$red res=XPASS recheck=yes gcopy=yes;;
+  0:*)   col=$grn res=PASS  recheck=no  gcopy=no;;
+  77:*)  col=$blu res=SKIP  recheck=no  gcopy=yes;;
+  99:*)  col=$mgn res=ERROR recheck=yes gcopy=yes;;
+  *:yes) col=$lgn res=XFAIL recheck=no  gcopy=yes;;
+  *:*)   col=$red res=FAIL  recheck=yes gcopy=yes;;
+esac
+
+# Report outcome to console.
+echo "${col}${res}${std}: $test_name"
+
+# Register the test result, and other relevant metadata.
+echo ":test-result: $res" > $trs_file
+echo ":global-test-result: $res" >> $trs_file
+echo ":recheck: $recheck" >> $trs_file
+echo ":copy-in-global-log: $gcopy" >> $trs_file
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'write-file-hooks 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC"
+# time-stamp-end: "; # UTC"
+# End: