Add --gerrit_no_reset for who need to use FETCH_HEAD revision.

Avoid to call git reset --soft to preserve current revision to
FETCH_HEAD.  'got_revision' property would also be that from
FETCH_HEAD.

BUG=596787

Review URL: https://codereview.chromium.org/1837453002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299721 0039d316-1c4b-4281-b951-d872f2087c98

recipe_modules/bot_update/api.py

@@ -60,7 +60,7 @@ class BotUpdateApi(recipe_api.RecipeApi):
                       patch_project_roots=None, patch_oauth2=False,
                       output_manifest=True, clobber=False,
                       root_solution_revision=None, rietveld=None, issue=None,
-                      patchset=None, **kwargs):
+                      patchset=None, gerrit_no_reset=False, **kwargs):
     """
     Args:
       gclient_config: The gclient configuration to use when running bot_update.
@@ -200,6 +200,8 @@ class BotUpdateApi(recipe_api.RecipeApi):
       cmd.append('--output_manifest')
     if with_branch_heads or cfg.with_branch_heads:
       cmd.append('--with_branch_heads')
+    if gerrit_no_reset:
+      cmd.append('--gerrit_no_reset')
 
     # Inject Json output for testing.
     git_mode = self._mastername not in SVN_MASTERS

recipe_modules/bot_update/example.expected/gerrit_no_reset.json

@@ -0,0 +1,45 @@
+[
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
+      "--master",
+      "experimental",
+      "--builder",
+      "Experimental Builder",
+      "--slave",
+      "somehost",
+      "--spec",
+      "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'svn://svn.chromium.org/chrome/trunk/src'}]",
+      "--root",
+      "src",
+      "--revision_mapping_file",
+      "{\"src\": \"got_cr_revision\"}",
+      "--git-cache-dir",
+      "[GIT_CACHE]",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src@HEAD",
+      "--gerrit_no_reset"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "env": {
+      "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
+    },
+    "name": "bot_update",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "name": "$result",
+    "recipe_result": null,
+    "status_code": 0
+  }
+]

recipe_modules/bot_update/example.py

@@ -30,6 +30,7 @@ def RunSteps(api):
   oauth2 = api.properties.get('oauth2', False)
   root_solution_revision = api.properties.get('root_solution_revision')
   suffix = api.properties.get('suffix')
+  gerrit_no_reset = True if api.properties.get('gerrit_no_reset') else False
   api.bot_update.ensure_checkout(force=force,
                                  no_shallow=no_shallow,
                                  patch=patch,
@@ -38,7 +39,8 @@ def RunSteps(api):
                                  refs=refs, patch_oauth2=oauth2,
                                  clobber=clobber,
                                  root_solution_revision=root_solution_revision,
-                                 suffix=suffix)
+                                 suffix=suffix,
+                                 gerrit_no_reset=gerrit_no_reset)
 
 
 def GenTests(api):
@@ -143,6 +145,12 @@ def GenTests(api):
       slavename='somehost',
       root_solution_revision='revision',
   )
+  yield api.test('gerrit_no_reset') + api.properties(
+      mastername='experimental',
+      buildername='Experimental Builder',
+      slavename='somehost',
+      gerrit_no_reset=1
+  )
   yield api.test('tryjob_v8') + api.properties(
       mastername='tryserver.chromium.linux',
       buildername='linux_rel',

recipe_modules/bot_update/resources/bot_update.py

@@ -1132,14 +1132,15 @@ def apply_rietveld_issue(issue, patchset, root, server, _rev_map, _revision,
   except SubprocessFailed as e:
     raise PatchFailed(e.message, e.code, e.output)
 
-def apply_gerrit_ref(gerrit_repo, gerrit_ref, root):
+def apply_gerrit_ref(gerrit_repo, gerrit_ref, root, gerrit_reset):
   gerrit_repo = gerrit_repo or 'origin'
   assert gerrit_ref
   try:
     base_rev = git('rev-parse', 'HEAD', cwd=root).strip()
     git('retry', 'fetch', gerrit_repo, gerrit_ref, cwd=root, tries=1)
     git('checkout', 'FETCH_HEAD', cwd=root)
-    git('reset', '--soft', base_rev, cwd=root)
+    if gerrit_reset:
+      git('reset', '--soft', base_rev, cwd=root)
   except SubprocessFailed as e:
     raise PatchFailed(e.message, e.code, e.output)
 
@@ -1297,7 +1298,8 @@ def ensure_checkout(solutions, revisions, first_sln, target_os, target_os_only,
                     patch_root, issue, patchset, patch_url, rietveld_server,
                     gerrit_repo, gerrit_ref, revision_mapping,
                     apply_issue_email_file, apply_issue_key_file, buildspec,
-                    gyp_env, shallow, runhooks, refs, git_cache_dir):
+                    gyp_env, shallow, runhooks, refs, git_cache_dir,
+                    gerrit_reset):
   # Get a checkout of each solution, without DEPS or hooks.
   # Calling git directly because there is no way to run Gclient without
   # invoking DEPS.
@@ -1363,7 +1365,7 @@ def ensure_checkout(solutions, revisions, first_sln, target_os, target_os_only,
                          revision_mapping, git_ref, apply_issue_email_file,
                          apply_issue_key_file, blacklist=already_patched)
   elif gerrit_ref:
-    apply_gerrit_ref(gerrit_repo, gerrit_ref, patch_root)
+    apply_gerrit_ref(gerrit_repo, gerrit_ref, patch_root, gerrit_reset)
 
   # Reset the deps_file point in the solutions so that hooks get run properly.
   for sln in solutions:
@@ -1442,6 +1444,8 @@ def parse_args():
   parse.add_option('--gerrit_repo',
                    help='Gerrit repository to pull the ref from.')
   parse.add_option('--gerrit_ref', help='Gerrit ref to apply.')
+  parse.add_option('--gerrit_no_reset', action='store_true',
+                   help='Bypass calling reset after applying a gerrit ref.')
   parse.add_option('--specs', help='Gcilent spec.')
   parse.add_option('--master', help='Master name.')
   parse.add_option('-f', '--force', action='store_true',
@@ -1611,7 +1615,8 @@ def checkout(options, git_slns, specs, buildspec, master,
           # Finally, extra configurations such as shallowness of the clone.
           shallow=options.shallow,
           refs=options.refs,
-          git_cache_dir=options.git_cache_dir)
+          git_cache_dir=options.git_cache_dir,
+          gerrit_reset=not options.gerrit_no_reset)
       gclient_output = ensure_checkout(**checkout_parameters)
     except GclientSyncFailed:
       print 'We failed gclient sync, lets delete the checkout and retry.'