Split out the big chromite shell 'main.py' into lots of subfiles.

shell/subcmds/build_cmd.py

Index: shell/subcmds/build_cmd.py
diff --git a/shell/subcmds/build_cmd.py b/shell/subcmds/build_cmd.py
new file mode 100644
index 0000000000000000000000000000000000000000..ae776d0a3753b8c298287304e7a942e62c844eb0
--- /dev/null
+++ b/shell/subcmds/build_cmd.py
@@ -0,0 +1,200 @@
+# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Implementation of the 'build' chromite command."""
+
+# Python imports
+import optparse
+import os
+
+
+# Local imports
+import chromite.lib.cros_build_lib as cros_lib
+from chromite.shell import utils
+from chromite.shell import subcmd
+
+
+def _DoMakeChroot(chroot_config, clean_first):
+  """Build the chroot, if needed.
+
+  Args:
+    chroot_config: A SafeConfigParser representing the config for the chroot.
+    clean_first: Delete any old chroot first.
+  """
+  # Skip this whole command if things already exist.
+  # TODO(dianders): Theoretically, calling make_chroot a second time is OK
+  # and "fixes up" the chroot.  ...but build_packages will do the fixups
+  # anyway (I think), so this isn't that important.
+  chroot_dir = utils.GetChrootAbsDir(chroot_config)
+  if (not clean_first) and utils.DoesChrootExist(chroot_config):
+    cros_lib.Info('%s already exists, skipping make_chroot.' % chroot_dir)
+    return
+
+  cros_lib.Info('MAKING THE CHROOT')
+
+  # Put together command.
+  cmd_list = [
+      './make_chroot',
+      '--chroot="%s"' % chroot_dir,
+      chroot_config.get('CHROOT', 'make_chroot_flags'),
+  ]
+  if clean_first:
+    cmd_list.insert(1, '--replace')
+
+  # We're going convert to a string and force the shell to do all of the
+  # splitting of arguments, since we're throwing all of the flags from the
+  # config file in there.
+  cmd = ' '.join(cmd_list)
+
+  # We'll put CWD as src/scripts when running the command.  Since everyone
+  # running by hand has their cwd there, it is probably the safest.
+  cwd = os.path.join(utils.SRCROOT_PATH, 'src', 'scripts')
+
+  # Run it.  Exceptions will cause the program to exit.
+  cros_lib.RunCommand(cmd, shell=True, cwd=cwd, ignore_sigint=True)
+
+
+def _DoSetupBoard(build_config, clean_first):
+  """Setup the board, if needed.
+
+  This just runs the setup_board command with the proper args, if needed.
+
+  Args:
+    build_config: A SafeConfigParser representing the build config.
+    clean_first: Delete any old board config first.
+  """
+  # Skip this whole command if things already exist.
+  board_dir = utils.GetBoardDir(build_config)
+  if (not clean_first) and os.path.isdir(board_dir):
+    cros_lib.Info('%s already exists, skipping setup_board.' % board_dir)
+    return
+
+  cros_lib.Info('SETTING UP THE BOARD')
+
+  # Put together command.
+  cmd_list = [
+      './setup_board',
+      '--board="%s"' % build_config.get('BUILD', 'target'),
+      build_config.get('BUILD', 'setup_board_flags'),
+  ]
+  if clean_first:
+    cmd_list.insert(1, '--force')
+
+  # We're going convert to a string and force the shell to do all of the
+  # splitting of arguments, since we're throwing all of the flags from the
+  # config file in there.
+  cmd = ' '.join(cmd_list)
+
+  # We'll put CWD as src/scripts when running the command.  Since everyone
+  # running by hand has their cwd there, it is probably the safest.
+  cwd = os.path.join(utils.SRCROOT_PATH, 'src', 'scripts')
+
+  # Run it.  Exceptions will cause the program to exit.
+  cros_lib.RunCommand(cmd, shell=True, cwd=cwd, ignore_sigint=True)
+
+
+def _DoBuildPackages(build_config):
+  """Build packages.
+
+  This just runs the build_packages command with the proper args.
+
+  Args:
+    build_config: A SafeConfigParser representing the build config.
+  """
+  cros_lib.Info('BUILDING PACKAGES')
+
+  # Put together command.  We're going to force the shell to do all of the
+  # splitting of arguments, since we're throwing all of the flags from the
+  # config file in there.
+  cmd = './build_packages --board="%s" %s' % (
+      build_config.get('BUILD', 'target'),
+      build_config.get('BUILD', 'build_packages_flags')
+  )
+
+  # We'll put CWD as src/scripts when running the command.  Since everyone
+  # running by hand has their cwd there, it is probably the safest.
+  cwd = os.path.join(utils.SRCROOT_PATH, 'src', 'scripts')
+
+  # Run it.  Exceptions will cause the program to exit.
+  cros_lib.RunCommand(cmd, shell=True, cwd=cwd, ignore_sigint=True)
+
+
+def _DoBuildImage(build_config):
+  """Build an image.
+
+  This just runs the build_image command with the proper args.
+
+  Args:
+    build_config: A SafeConfigParser representing the build config.
+  """
+  cros_lib.Info('BUILDING THE IMAGE')
+
+  # Put together command.  We're going to force the shell to do all of the
+  # splitting of arguments, since we're throwing all of the flags from the
+  # config file in there.
+  cmd = './build_image --board="%s" %s' % (
+      build_config.get('BUILD', 'target'),
+      build_config.get('IMAGE', 'build_image_flags')
+  )
+
+  # We'll put CWD as src/scripts when running the command.  Since everyone
+  # running by hand has their cwd there, it is probably the safest.
+  cwd = os.path.join(utils.SRCROOT_PATH, 'src', 'scripts')
+
+  # Run it.  Exceptions will cause the program to exit.
+  cros_lib.RunCommand(cmd, shell=True, cwd=cwd, ignore_sigint=True)
+
+
+class BuildCmd(subcmd.ChromiteCmd):
+  """Build the chroot (if needed), the packages for a target, and the image."""
+
+  def Run(self, raw_argv, chroot_config=None,
+          loaded_config=False, build_config=None):
+    """Run the command.
+
+    Args:
+      raw_argv: Command line arguments, including this command's name, but not
+          the chromite command name or chromite options.
+      chroot_config: A SafeConfigParser for the chroot config; or None chromite
+          was called from within the chroot.
+      loaded_config: If True, we've already loaded the config.
+      build_config: None when called normally, but contains the SafeConfigParser
+          for the build config if we call ourselves with _DoEnterChroot().  Note
+          that even when called through _DoEnterChroot(), could still be None
+          if user chose 'HOST' as the target.
+    """
+    # Parse options for command...
+    usage_str = ('usage: %%prog [chromite_options] %s [options] [target]' %
+                 raw_argv[0])
+    parser = optparse.OptionParser(usage=usage_str)
+    parser.add_option('--clean', default=False, action='store_true',
+                      help='Clean before building.')
+    (options, argv) = parser.parse_args(raw_argv[1:])
+
+    # Load the build config if needed...
+    if not loaded_config:
+      argv, build_config = utils.GetBuildConfigFromArgs(argv)
+      if argv:
+        cros_lib.Die('Unknown arguments: %s' % ' '.join(argv))
+
+    if not cros_lib.IsInsideChroot():
+      # Note: we only want to clean the chroot if they do --clean and have the
+      # host target.  If they do --clean and have a board target, it means
+      # that they just want to clean the board...
+      want_clean_chroot = options.clean and build_config is None
+
+      _DoMakeChroot(chroot_config, want_clean_chroot)
+
+      if build_config is not None:
+        utils.EnterChroot(chroot_config, (self, 'Run'), raw_argv,
+                          build_config=build_config, loaded_config=True)
+
+      cros_lib.Info('Done building.')
+    else:
+      if build_config is None:
+        cros_lib.Die("You can't build the host chroot from within the chroot.")
+
+      _DoSetupBoard(build_config, options.clean)
+      _DoBuildPackages(build_config)
+      _DoBuildImage(build_config)