Revert "Selectively clobber git cache when revision can not be found."

This reverts commit 67d5986d7ec383c879569a1abd7bfd5d6ccf4ccc.

Reason for revert: Failing for windows when files in cache/builder can not be deleted and for linux when cache/builder does not exist.

Original change's description:
> Selectively clobber git cache when revision can not be found.
>
> Sometimes the checkout process fails and got_revision is not populated.
> This change will make those cases fail, clobber and retry the checkout.
>
> Bug: https://github.com/flutter/flutter/issues/105476
> Change-Id: I332d0ab2efef80adc85d1fe6ca247f1ada55b502
> Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/31071
> Reviewed-by: Keyong Han <keyonghan@google.com>
> Commit-Queue: Godofredo Contreras <godofredoc@google.com>

TBR=zra@google.com,godofredoc@google.com,keyonghan@google.com,flutter-scoped@luci-project-accounts.iam.gserviceaccount.com,dnfield@google.com

Change-Id: I0d37d6f99bdff546d3ae1b5c84ed19f1ee06d099
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: https://github.com/flutter/flutter/issues/105476
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/31122
Reviewed-by: Godofredo Contreras <godofredoc@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>
diff --git a/recipe_modules/repo_util/api.py b/recipe_modules/repo_util/api.py
index 9b676df..b3b883b 100644
--- a/recipe_modules/repo_util/api.py
+++ b/recipe_modules/repo_util/api.py
@@ -60,11 +60,9 @@
       # being found after a failure.
       with self.m.depot_tools.on_path():
         self.m.file.rmtree('Clobber cache', checkout_path)
-        self.m.path.mock_add_directory(self.m.path['cache'].join('git'))
-        if self.m.path.exists(self.m.path['cache'].join('git')):
-          self.m.file.rmtree(
-              'Clobber git cache', self.m.path['cache'].join('git')
-          )
+        self.m.file.rmtree(
+            'Clobber git cache', self.m.path['cache'].join('git')
+        )
         self.m.file.ensure_directory('Ensure checkout cache', checkout_path)
 
     # Inner function to execute code a second time in case of failure.
@@ -88,10 +86,7 @@
             self.m.gclient.c = src_cfg
             self.m.gclient.c.got_revision_mapping['src/flutter'
                                                 ] = 'got_engine_revision'
-            step_result = self.m.bot_update.ensure_checkout()
-            if ('got_revision' in step_result.presentation.properties and
-                step_result.presentation.properties['got_revision'] == 'BOT_UPDATE_NO_REV_FOUND'):
-              raise self.m.step.StepFailure('BOT_UPDATE_NO_REV_FOUND')
+            self.m.bot_update.ensure_checkout()
             self.m.gclient.runhooks()
           except:
             # On any exception, clean up the cache and raise
diff --git a/recipe_modules/repo_util/examples/full.expected/first_bot_update_failed.json b/recipe_modules/repo_util/examples/full.expected/first_bot_update_failed.json
index 49fdb6b..8838d36 100644
--- a/recipe_modules/repo_util/examples/full.expected/first_bot_update_failed.json
+++ b/recipe_modules/repo_util/examples/full.expected/first_bot_update_failed.json
@@ -816,9 +816,9 @@
       "The recipe has crashed at point 'Uncaught exception'!",
       "",
       "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/full.py\", line 30, in RunSteps",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/full.py\", line 29, in RunSteps",
       "    api.repo_util.engine_checkout(api.path['start_dir'].join('engine'), {}, {})",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/api.py\", line 101, in engine_checkout",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/api.py\", line 96, in engine_checkout",
       "    self.m.retry.wrap(_InnerCheckout, step_name='Checkout source', sleep=10.0, backoff_factor=5, max_attempts=4)",
       "  File \"RECIPE_REPO[flutter]/recipe_modules/retry/api.py\", line 88, in wrap",
       "    step = self.m.step.active_result",
diff --git a/recipe_modules/repo_util/examples/full.expected/first_bot_update_revision_not_found.json b/recipe_modules/repo_util/examples/full.expected/first_bot_update_revision_not_found.json
deleted file mode 100644
index 56baf58..0000000
--- a/recipe_modules/repo_util/examples/full.expected/first_bot_update_revision_not_found.json
+++ /dev/null
@@ -1,807 +0,0 @@
-[
-  {
-    "cmd": [],
-    "name": "Checkout flutter/flutter"
-  },
-  {
-    "cmd": [
-      "python3",
-      "-u",
-      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
-      "--path",
-      "[START_DIR]/flutter",
-      "--url",
-      "https://flutter.googlesource.com/mirrors/flutter"
-    ],
-    "name": "Checkout flutter/flutter.git setup",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "fetch",
-      "origin",
-      "master",
-      "--recurse-submodules",
-      "--progress",
-      "--tags"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "env": {
-      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
-    },
-    "infra_step": true,
-    "name": "Checkout flutter/flutter.git fetch",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "checkout",
-      "-f",
-      "FETCH_HEAD"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter.git checkout",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "rev-parse",
-      "HEAD"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter.read revision",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
-      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "clean",
-      "-f",
-      "-d",
-      "-x"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter.git clean",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "sync"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter.submodule sync",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "update",
-      "--init",
-      "--recursive"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter.submodule update",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "Checkout flutter/engine"
-  },
-  {
-    "cmd": [
-      "python3",
-      "-u",
-      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
-      "--path",
-      "[START_DIR]/engine",
-      "--url",
-      "https://flutter.googlesource.com/mirrors/engine"
-    ],
-    "name": "Checkout flutter/engine.git setup",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "fetch",
-      "origin",
-      "main",
-      "--recurse-submodules",
-      "--progress",
-      "--tags"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "env": {
-      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
-    },
-    "infra_step": true,
-    "name": "Checkout flutter/engine.git fetch",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "checkout",
-      "-f",
-      "FETCH_HEAD"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "infra_step": true,
-    "name": "Checkout flutter/engine.git checkout",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "rev-parse",
-      "HEAD"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "infra_step": true,
-    "name": "Checkout flutter/engine.read revision",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
-      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "clean",
-      "-f",
-      "-d",
-      "-x"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "infra_step": true,
-    "name": "Checkout flutter/engine.git clean",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "sync"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "infra_step": true,
-    "name": "Checkout flutter/engine.submodule sync",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "update",
-      "--init",
-      "--recursive"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "infra_step": true,
-    "name": "Checkout flutter/engine.submodule update",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "Checkout flutter/cocoon"
-  },
-  {
-    "cmd": [
-      "python3",
-      "-u",
-      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
-      "--path",
-      "[START_DIR]/cocoon",
-      "--url",
-      "https://flutter.googlesource.com/mirrors/cocoon"
-    ],
-    "name": "Checkout flutter/cocoon.git setup",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "fetch",
-      "origin",
-      "main",
-      "--recurse-submodules",
-      "--progress",
-      "--tags"
-    ],
-    "cwd": "[START_DIR]/cocoon",
-    "env": {
-      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
-    },
-    "infra_step": true,
-    "name": "Checkout flutter/cocoon.git fetch",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "checkout",
-      "-f",
-      "FETCH_HEAD"
-    ],
-    "cwd": "[START_DIR]/cocoon",
-    "infra_step": true,
-    "name": "Checkout flutter/cocoon.git checkout",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "rev-parse",
-      "HEAD"
-    ],
-    "cwd": "[START_DIR]/cocoon",
-    "infra_step": true,
-    "name": "Checkout flutter/cocoon.read revision",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
-      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "clean",
-      "-f",
-      "-d",
-      "-x"
-    ],
-    "cwd": "[START_DIR]/cocoon",
-    "infra_step": true,
-    "name": "Checkout flutter/cocoon.git clean",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "sync"
-    ],
-    "cwd": "[START_DIR]/cocoon",
-    "infra_step": true,
-    "name": "Checkout flutter/cocoon.submodule sync",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "update",
-      "--init",
-      "--recursive"
-    ],
-    "cwd": "[START_DIR]/cocoon",
-    "infra_step": true,
-    "name": "Checkout flutter/cocoon.submodule update",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "Checkout flutter/packages"
-  },
-  {
-    "cmd": [
-      "python3",
-      "-u",
-      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
-      "--path",
-      "[START_DIR]/packages",
-      "--url",
-      "https://flutter.googlesource.com/mirrors/packages"
-    ],
-    "name": "Checkout flutter/packages.git setup",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "fetch",
-      "origin",
-      "main",
-      "--recurse-submodules",
-      "--progress",
-      "--tags"
-    ],
-    "cwd": "[START_DIR]/packages",
-    "env": {
-      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
-    },
-    "infra_step": true,
-    "name": "Checkout flutter/packages.git fetch",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "checkout",
-      "-f",
-      "FETCH_HEAD"
-    ],
-    "cwd": "[START_DIR]/packages",
-    "infra_step": true,
-    "name": "Checkout flutter/packages.git checkout",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "rev-parse",
-      "HEAD"
-    ],
-    "cwd": "[START_DIR]/packages",
-    "infra_step": true,
-    "name": "Checkout flutter/packages.read revision",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
-      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "clean",
-      "-f",
-      "-d",
-      "-x"
-    ],
-    "cwd": "[START_DIR]/packages",
-    "infra_step": true,
-    "name": "Checkout flutter/packages.git clean",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "sync"
-    ],
-    "cwd": "[START_DIR]/packages",
-    "infra_step": true,
-    "name": "Checkout flutter/packages.submodule sync",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "update",
-      "--init",
-      "--recursive"
-    ],
-    "cwd": "[START_DIR]/packages",
-    "infra_step": true,
-    "name": "Checkout flutter/packages.submodule update",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "Checkout flutter/flutter (2)"
-  },
-  {
-    "cmd": [
-      "python3",
-      "-u",
-      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
-      "--path",
-      "[START_DIR]/flutter",
-      "--url",
-      "https://flutter.googlesource.com/mirrors/flutter"
-    ],
-    "name": "Checkout flutter/flutter (2).git setup",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "fetch",
-      "origin",
-      "beta",
-      "--recurse-submodules",
-      "--progress",
-      "--tags"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "env": {
-      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
-    },
-    "infra_step": true,
-    "name": "Checkout flutter/flutter (2).git fetch",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "checkout",
-      "-f",
-      "FETCH_HEAD"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter (2).git checkout",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "rev-parse",
-      "HEAD"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter (2).read revision",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
-      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "clean",
-      "-f",
-      "-d",
-      "-x"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter (2).git clean",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "sync"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter (2).submodule sync",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "submodule",
-      "update",
-      "--init",
-      "--recursive"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "Checkout flutter/flutter (2).submodule update",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "git",
-      "rev-parse",
-      "HEAD"
-    ],
-    "cwd": "[START_DIR]/flutter",
-    "infra_step": true,
-    "name": "git rev-parse"
-  },
-  {
-    "cmd": [],
-    "name": "Checkout source code",
-    "~followup_annotations": [
-      "@@@STEP_FAILURE@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "vpython3",
-      "-u",
-      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
-      "--json-output",
-      "/path/to/tmp/json",
-      "rmtree",
-      "[START_DIR]/engine"
-    ],
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "infra_step": true,
-    "name": "Checkout source code.Clobber cache",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "vpython3",
-      "-u",
-      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
-      "--json-output",
-      "/path/to/tmp/json",
-      "rmtree",
-      "[CACHE]/git"
-    ],
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "infra_step": true,
-    "name": "Checkout source code.Clobber git cache",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "vpython3",
-      "-u",
-      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
-      "--json-output",
-      "/path/to/tmp/json",
-      "ensure-directory",
-      "--mode",
-      "0777",
-      "[START_DIR]/engine"
-    ],
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "infra_step": true,
-    "name": "Checkout source code.Ensure checkout cache",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "vpython3",
-      "-u",
-      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
-      "--spec-path",
-      "cache_dir = '[CACHE]/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': False, 'name': 'src/flutter', 'url': 'https://github.com/flutter/engine'}]",
-      "--revision_mapping_file",
-      "{\"got_engine_revision\": \"src/flutter\"}",
-      "--git-cache-dir",
-      "[CACHE]/git",
-      "--cleanup-dir",
-      "[CLEANUP]/bot_update",
-      "--output_json",
-      "/path/to/tmp/json",
-      "--revision",
-      "src/flutter@refs/pull/1/head",
-      "--refs",
-      "refs/pull/1/head"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "env": {
-      "DEPOT_TOOLS_COLLECT_METRICS": "0",
-      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
-      "GIT_HTTP_LOW_SPEED_TIME": "1800"
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0",
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]",
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "infra_step": true,
-    "name": "Checkout source code.bot_update",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@",
-      "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
-      "@@@STEP_LOG_LINE@json.output@    \"got_revision\": \"BOT_UPDATE_NO_REV_FOUND\"@@@",
-      "@@@STEP_LOG_LINE@json.output@  }@@@",
-      "@@@STEP_LOG_LINE@json.output@}@@@",
-      "@@@STEP_LOG_END@json.output@@@",
-      "@@@SET_BUILD_PROPERTY@got_revision@\"BOT_UPDATE_NO_REV_FOUND\"@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "vpython3",
-      "-u",
-      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
-      "--json-output",
-      "/path/to/tmp/json",
-      "rmtree",
-      "[START_DIR]/engine"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0",
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]",
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "infra_step": true,
-    "name": "Checkout source code.Clobber cache (2)",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "vpython3",
-      "-u",
-      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
-      "--json-output",
-      "/path/to/tmp/json",
-      "rmtree",
-      "[CACHE]/git"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0",
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]",
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "infra_step": true,
-    "name": "Checkout source code.Clobber git cache (2)",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "vpython3",
-      "-u",
-      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
-      "--json-output",
-      "/path/to/tmp/json",
-      "ensure-directory",
-      "--mode",
-      "0777",
-      "[START_DIR]/engine"
-    ],
-    "cwd": "[START_DIR]/engine",
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0",
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]",
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "infra_step": true,
-    "name": "Checkout source code.Ensure checkout cache (2)",
-    "~followup_annotations": [
-      "@@@STEP_NEST_LEVEL@1@@@"
-    ]
-  },
-  {
-    "cmd": [],
-    "name": "RECIPE CRASH (Uncaught exception)",
-    "~followup_annotations": [
-      "@@@STEP_EXCEPTION@@@",
-      "The recipe has crashed at point 'Uncaught exception'!",
-      "",
-      "Traceback (most recent call last):",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/full.py\", line 30, in RunSteps",
-      "    api.repo_util.engine_checkout(api.path['start_dir'].join('engine'), {}, {})",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/api.py\", line 101, in engine_checkout",
-      "    self.m.retry.wrap(_InnerCheckout, step_name='Checkout source', sleep=10.0, backoff_factor=5, max_attempts=4)",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/retry/api.py\", line 88, in wrap",
-      "    step = self.m.step.active_result",
-      "  File \"RECIPE_REPO[recipe_engine]/recipe_modules/step/api.py\", in active_result",
-      "    return self.step_client.previous_step_result()",
-      "  File \"RECIPE_REPO[recipe_engine]/recipe_engine/recipe_api.py\", in previous_step_result",
-      "    raise ValueError(",
-      "ValueError('No steps have been run yet, and you are asking for a previous step result.')"
-    ]
-  },
-  {
-    "failure": {
-      "humanReason": "Uncaught Exception: ValueError('No steps have been run yet, and you are asking for a previous step result.')"
-    },
-    "name": "$result"
-  }
-]
\ No newline at end of file
diff --git a/recipe_modules/repo_util/examples/full.py b/recipe_modules/repo_util/examples/full.py
index d804a7e..a1f3b70 100644
--- a/recipe_modules/repo_util/examples/full.py
+++ b/recipe_modules/repo_util/examples/full.py
@@ -7,7 +7,6 @@
 DEPS = [
     'flutter/repo_util',
     'recipe_engine/context',
-    'recipe_engine/json',
     'recipe_engine/path',
     'recipe_engine/properties',
     'recipe_engine/raw_io',
@@ -67,22 +66,4 @@
       api.expect_exception('ValueError') +
       api.step_data("Checkout source code.bot_update", retcode=1) +
       api.repo_util.flutter_environment_data()
-  )
-  yield (
-      api.test(
-          'first_bot_update_revision_not_found',
-          api.properties(
-              git_url='https://github.com/flutter/engine',
-              git_ref='refs/pull/1/head'
-          )
-      ) +
-      # Next line force a fail condition for the bot update
-      # first execution.
-      api.expect_exception('ValueError') +
-      api.path.exists(api.path['cache'].join('git')) +
-      api.override_step_data(
-          "Checkout source code.bot_update",
-          api.json.output({'properties': {'got_revision': 'BOT_UPDATE_NO_REV_FOUND'}}),
-          retcode=0) +
-      api.repo_util.flutter_environment_data()
-  )
+  )
\ No newline at end of file
diff --git a/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json b/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json
index ab5c52a..6d8af43 100644
--- a/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json
+++ b/recipe_modules/repo_util/examples/unsupported.expected/unsupported.json
@@ -9,7 +9,7 @@
       "Traceback (most recent call last):",
       "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/examples/unsupported.py\", line 15, in RunSteps",
       "    api.repo_util.checkout('unsupported_repo', repo_dir)",
-      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/api.py\", line 116, in checkout",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/repo_util/api.py\", line 111, in checkout",
       "    raise ValueError('Unsupported repo: %s' % name)",
       "ValueError('Unsupported repo: unsupported_repo')"
     ]