Step 1 in porting page cycler http to linux. Add http startup to

tools/python/google/platform_utils_linux.py

Index: tools/python/google/platform_utils_linux.py
diff --git a/tools/python/google/platform_utils_linux.py b/tools/python/google/platform_utils_linux.py
new file mode 100644
index 0000000000000000000000000000000000000000..a735111c575402a9800df5bf0b347bd53004b56a
--- /dev/null
+++ b/tools/python/google/platform_utils_linux.py
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+#!/usr/bin/python
+# Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Platform-specific utility methods shared by several scripts."""
+
+import os
+import subprocess
+
+import google.path_utils
+
+
+class PlatformUtility(object):
+  def __init__(self, base_dir):
+    """Args:
+         base_dir: the base dir for running tests.
+    """
+    self._base_dir = base_dir
+    self._httpd_cmd_string = None  # used for starting/stopping httpd
+    self._bash = "/bin/bash"
+
+  def _UnixRoot(self):
+    """Returns the path to root."""
+    return "/"
+
+  def GetFilesystemRoot(self):
+    """Returns the root directory of the file system."""
+    return self._UnixRoot()
+
+  def GetTempDirectory(self):
+    """Returns the file system temp directory
+
+    Note that this does not use a random subdirectory, so it's not
+    intrinsically secure.  If you need a secure subdir, use the tempfile
+    package.
+    """
+    return os.getenv("TMPDIR", "/tmp")
+
+  def FilenameToUri(self, path, use_http=False, use_ssl=False, port=8000):
+    """Convert a filesystem path to a URI.
+
+    Args:
+      path: For an http URI, the path relative to the httpd server's
+          DocumentRoot; for a file URI, the full path to the file.
+      use_http: if True, returns a URI of the form http://127.0.0.1:8000/.
+          If False, returns a file:/// URI.
+      use_ssl: if True, returns HTTPS URL (https://127.0.0.1:8000/).
+          This parameter is ignored if use_http=False.
+      port: The port number to append when returning an HTTP URI
+    """
+    if use_http:
+      protocol = 'http'
+      if use_ssl:
+        protocol = 'https'
+      return "%s://127.0.0.1:%d/%s" % (protocol, port, path)
+    return "file://" + path
+
+  def GetStartHttpdCommand(self, output_dir,
+                           httpd_conf_path, mime_types_path,
+                           document_root=None, apache2=False):
+    """Prepares the config file and output directory to start an httpd server.
+    Returns a list of strings containing the server's command line+args.
+
+    Args:
+      output_dir: the path to the server's output directory, for log files.
+          It will be created if necessary.
+      httpd_conf_path: full path to the httpd.conf file to be used.
+      mime_types_path: full path to the mime.types file to be used.
+      document_root: full path to the DocumentRoot.  If None, the DocumentRoot
+          from the httpd.conf file will be used.  Note that the httpd.conf
+          file alongside this script does not specify any DocumentRoot, so if
+          you're using that one, be sure to specify a document_root here.
+      apache2: boolean if true will cause this function to return start
+               command for Apache 2.x as opposed to Apache 1.3.x. This flag
+               is ignored on Linux (but preserved here for compatibility in
+               function signature with win), where apache2 is used always
+    """
+
+    exe_name = "apache2"
+    cert_file = google.path_utils.FindUpward(self._base_dir, 'tools',
+                                             'python', 'google',
+                                             'httpd_config', 'httpd2.pem')
+    httpd_vars = {
+      "httpd_executable_path":
+          os.path.join(self._UnixRoot(), "usr", "sbin", exe_name),
+      "httpd_conf_path": httpd_conf_path,
+      "ssl_certificate_file": cert_file,
+      "document_root" : document_root,
+      "server_root": os.path.join(self._UnixRoot(), "usr"),
+      "mime_types_path": mime_types_path,
+      "output_dir": output_dir,
+      "user": os.environ.get("USER", "#%d" % os.geteuid()),
+      "lock_file": os.path.join(output_dir, "accept.lock"),
+    }
+
+    google.path_utils.MaybeMakeDirectory(output_dir)
+
+    # We have to wrap the command in bash
+    # -C: process directive before reading config files
+    # -c: process directive after reading config files
+    # Apache wouldn't run CGIs with permissions==700 unless we add
+    # -c User "<username>"
+    httpd_cmd_string = (
+      '%(httpd_executable_path)s'
+      ' -f %(httpd_conf_path)s'
+      ' -c \'TypesConfig "%(mime_types_path)s"\''
+      ' -c \'CustomLog "%(output_dir)s/access_log.txt" common\''
+      ' -c \'ErrorLog "%(output_dir)s/error_log.txt"\''
+      ' -c \'PidFile "%(output_dir)s/httpd.pid"\''
+      ' -C \'User "%(user)s"\''
+      ' -C \'ServerRoot "%(server_root)s"\''
+      ' -c \'LockFile "%(lock_file)s"\''
+      ' -c \'SSLCertificateFile "%(ssl_certificate_file)s"\''
+    )
+
+    if document_root:
+      httpd_cmd_string += ' -C \'DocumentRoot "%(document_root)s"\''
+    # Save a copy of httpd_cmd_string to use for stopping httpd
+    self._httpd_cmd_string = httpd_cmd_string % httpd_vars
+
+    httpd_cmd = [self._bash, "-c", self._httpd_cmd_string]
+    return httpd_cmd
+
+  def GetStopHttpdCommand(self):
+    """Returns a list of strings that contains the command line+args needed to
+    stop the http server used in the http tests.
+
+    This tries to fetch the pid of httpd (if available) and returns the
+    command to kill it. If pid is not available, kill all httpd processes
+    """
+
+    if not self._httpd_cmd_string:
+      return ["true"]   # Haven't been asked for the start cmd yet. Just pass.
+    # Add a sleep after the shutdown because sometimes it takes some time for
+    # the port to be available again.
+    return [self._bash, "-c", self._httpd_cmd_string + ' -k stop && sleep 5']