common: create a Component class to factor out builds

Not yet finished factoring, but half way there, do for all build-

build-linux

@@ -3,86 +3,90 @@
 import multiprocessing
 import os
 import shutil
-import subprocess
-import time
 
 import common
 
-parser = common.get_argparse()
-common.add_build_arguments(parser)
-parser.add_argument(
-    'extra_make_args',
-    default=[],
-    metavar='extra-make-args',
-    nargs='*'
-)
-args = common.setup(parser)
-if args.clean:
-    common.rmrf(common.linux_build_dir)
-else:
-    if not common.dry_run:
-        start_time = time.time()
-    os.makedirs(common.linux_build_dir, exist_ok=True)
-    shutil.copy2(
-        os.path.join(common.linux_config_dir, 'buildroot-{}'.format(args.arch)),
-        os.path.join(common.linux_build_dir, '.config'),
-    )
-    tool = 'gcc'
-    gcc = common.get_toolchain_tool(tool)
-    prefix = gcc[:-len(tool)]
-    common_args = {
-        'cwd': common.linux_src_dir,
-    }
-    ccache = shutil.which('ccache')
-    if ccache is not None:
-        cc = '{} {}'.format(ccache, gcc)
-    else:
-        cc = gcc
-    common_make_args = [
-        'ARCH={}'.format(common.linux_arch),
-        'CROSS_COMPILE={}'.format(prefix),
-        'CC={}'.format(cc),
-        'O={}'.format(common.linux_build_dir),
-    ]
-    if args.verbose:
-        verbose = ['V=1']
-    else:
-        verbose = []
-    assert common.run_cmd(
-        [
-            os.path.join(common.linux_src_dir, 'scripts', 'kconfig', 'merge_config.sh'),
-            '-m',
-            '-O', common.linux_build_dir,
-            os.path.join(common.linux_build_dir, '.config'),
-            os.path.join(common.linux_config_dir, 'min'),
-            os.path.join(common.linux_config_dir, 'default'),
-        ],
-    ) == 0
-    assert common.run_cmd(
-        (
+class LinuxComponent(common.Component):
+    def add_parser_arguments(self, parser):
+        parser.add_argument(
+            'extra_make_args',
+            default=[],
+            metavar='extra-make-args',
+            nargs='*'
+        )
+
+    def do_build(self, args):
+        build_dir = self.get_build_dir(args)
+        os.makedirs(build_dir, exist_ok=True)
+        common.cp(
+            os.path.join(common.linux_config_dir, 'buildroot-{}'.format(args.arch)),
+            os.path.join(build_dir, '.config'),
+        )
+        tool = 'gcc'
+        gcc = common.get_toolchain_tool(tool)
+        prefix = gcc[:-len(tool)]
+        common_args = {
+            'cwd': common.linux_src_dir,
+        }
+        ccache = shutil.which('ccache')
+        if ccache is not None:
+            cc = '{} {}'.format(ccache, gcc)
+        else:
+            cc = gcc
+        common_make_args = [
+            'ARCH={}'.format(common.linux_arch),
+            'CROSS_COMPILE={}'.format(prefix),
+            'CC={}'.format(cc),
+            'O={}'.format(build_dir),
+        ]
+        if args.verbose:
+            verbose = ['V=1']
+        else:
+            verbose = []
+        assert common.run_cmd(
             [
-                'make',
-                '-j', str(multiprocessing.cpu_count()),
-            ] +
-            common_make_args +
-            [
-                'olddefconfig',
-            ]
-        ),
-        **common_args,
-    ) == 0
-    assert common.run_cmd(
-        (
-            [
-                'make',
-                '-j', str(multiprocessing.cpu_count()),
-            ] +
-            common_make_args +
-            verbose +
-            args.extra_make_args
-        ),
-        **common_args,
-    ) == 0
-    if not common.dry_run:
-        end_time = time.time()
-        common.print_time(end_time - start_time)
+                os.path.join(common.linux_src_dir, 'scripts', 'kconfig', 'merge_config.sh'),
+                '-m',
+                '-O', build_dir,
+                os.path.join(build_dir, '.config'),
+                os.path.join(common.linux_config_dir, 'min'),
+                os.path.join(common.linux_config_dir, 'default'),
+            ],
+        ) == 0
+        assert common.run_cmd(
+            (
+                [
+                    'make',
+                    '-j', str(multiprocessing.cpu_count()),
+                ] +
+                common_make_args +
+                [
+                    'olddefconfig',
+                ]
+            ),
+            **common_args,
+        ) == 0
+        assert common.run_cmd(
+            (
+                [
+                    'make',
+                    '-j', str(multiprocessing.cpu_count()),
+                ] +
+                common_make_args +
+                verbose +
+                args.extra_make_args
+            ),
+            **common_args,
+        ) == 0
+
+    def get_argparse_args(self):
+        return {
+                'description': '''\
+Build the Linux kernel.
+'''
+        }
+
+    def get_build_dir(self, args):
+        return common.linux_build_dir
+
+LinuxComponent().build()