add fast rebuild mechanism to skip prepare, preloader, gn_gen steps when no gn...

add fast rebuild mechanism to skip prepare, preloader, gn_gen steps when no gn related scripts changed
Signed-off-by: Nliwentao <liwentao20@huawei.com>
Change-Id: I9f6d575f859a24b7c2f490a9a979f0a157e78578

hb_internal/build/build.py

@@ -91,6 +91,12 @@ def add_options(parser):
     parser.add_argument('--build-only-gn',
                         action='store_true',
                         help='only do gn parse, donot run ninja')
+    parser.add_argument('--fast-rebuild',
+                        action='store_true',
+                        default=False,
+                        help='it will skip prepare, preloader, '
+                        'gn_gen steps so we can enable it only '
+                        'when there is no change for gn related script')
 
 
 def exec_command(args):
@@ -163,6 +169,8 @@ def exec_command(args):
     ninja = True
     if hasattr(args, 'build_only_gn') and args.build_only_gn:
         ninja = False
+    if args.fast_rebuild:
+        cmd_args['fast_rebuild'] = args.fast_rebuild
     return build.build(args.full,
                        patch=args.patch,
                        cmd_args=cmd_args,

hb_internal/build/build_process.py

@@ -132,7 +132,7 @@ class Build():
     def build(self, full_compile, patch=False, ninja=True, cmd_args=None):
         if 'target_cpu' in str(cmd_args):
             self.config.target_cpu = cmd_args["target_cpu"]
-        cmd_list = self.get_cmd(full_compile, patch, ninja)
+        cmd_list = self.get_cmd(full_compile, patch, ninja, cmd_args)
 
         # enable ccache if it installed.
         ccache_path = find_executable('ccache')
@@ -156,18 +156,19 @@ class Build():
         hb_info(f'cost time: {self.build_time}')
         return 0
 
-    def get_cmd(self, full_compile, patch, ninja):
+    def get_cmd(self, full_compile, patch, ninja, cmd_args):
         cmd_list = []
-
-        pre_build = PreBuild(self.config)
-        cmd_list.append(pre_build.prepare)
+        if not cmd_args.get('fast_rebuild'):
+            pre_build = PreBuild(self.config)
+            cmd_list.append(pre_build.prepare)
 
         if patch:
             patch = Patch()
             cmd_list.append(patch.patch_make)
 
-        preloader = Preloader(self.config)
-        cmd_list.append(preloader.run)
+        if not cmd_args.get('fast_rebuild'):
+            preloader = Preloader(self.config)
+            cmd_list.append(preloader.run)
 
         # if full_compile is set, remove out and do full build
         # if build_only_gn is set, only do gn parse
@@ -175,14 +176,20 @@ class Build():
         if full_compile:
             remove_path(self.config.out_path)
             makedirs(self.config.out_path, exist_ok=True)
-            cmd_list.extend([self.gn_build, self.ninja_build])
+            if not cmd_args.get('fast_rebuild'):
+                cmd_list.append(self.gn_build)
+            cmd_list.append(self.ninja_build)
         elif not ninja:
             makedirs(self.config.out_path, exist_ok=True)
-            cmd_list.append(self.gn_build)
+            if not cmd_args.get('fast_rebuild'):
+                cmd_list.append(self.gn_build)
             return cmd_list
         else:
             makedirs(self.config.out_path, exist_ok=True)
-            cmd_list.extend([self.gn_build, self.ninja_build])
+            if not cmd_args.get('fast_rebuild'):
+                cmd_list.append(self.gn_build)
+            cmd_list.append(self.ninja_build)
+
 
         if self.config.os_level != "standard":
             if self.config.fs_attr is not None: