Roll recipe dependencies (nontrivial).

scripts/slave/recipes/infra/recipe_autoroller_public.expected/empty.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "config",
       "--spec",
       "cache_dir = '[GIT_CACHE]'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'infra', 'url': 'https://chromium.googlesource.com/infra/infra.git'}]"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient setup"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "sync",
       "--verbose",
       "--with_branch_heads",
       "--nohooks",
       "-j8",
       "--reset",
       "--force",
       "--upstream",
       "--no-nag-max",
       "--delete_unversioned_trees",
       "--revision",
       "infra@origin/master",
       "--revision",
       "infra/recipes-py@origin/master",
       "--output-json",
       "/path/to/tmp/json"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient sync",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"solutions\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"infra/\": {@@@",
       "@@@STEP_LOG_LINE@json.output@      \"revision\": \"5e03a58dc0850e5137a8ebbce29610670c756aed\"@@@",
       "@@@STEP_LOG_LINE@json.output@    }, @@@",
@@ skipping 10 matching lines @@
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "recurse",
       "git",
       "config",
       "user.name",
       "local_bot"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient recurse (git config user.name)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "recurse",
       "git",
       "config",
       "user.email",
       "local_bot@example.com"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient recurse (git config user.email)"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[depot_tools]/gclient.py",
       "runhooks"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "env": {
       "PATH": "%(PATH)s:RECIPE_PACKAGE_REPO[depot_tools]"
     },
     "name": "gclient runhooks"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]/scripts/tools/pycurl.py",
       "https://luci-config.appspot.com/_ah/api/config/v1/projects",
       "--outfile",
       "/path/to/tmp/"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "Get luci-config projects"
   },
   {
     "cmd": [],
-    "cwd": "[SLAVE_BUILD]",
     "name": "build"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
       "--path",
       "[TMP_BASE]/roll_build_tmp_1",
       "--url",
       "https://repo.repo/build"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "build.git setup",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@"
     ]
   },
   {
     "cmd": [
       "git",
       "retry",
       "fetch",
@@ skipping 92 matching lines @@
     "cmd": [
       "[SLAVE_BUILD]/infra/ENV/bin/python",
       "-u",
       "[SLAVE_BUILD]/infra/recipes-py/recipes.py",
       "--package",
       "[TMP_BASE]/roll_build_tmp_1/infra/config/recipes.cfg",
       "autoroll",
       "--output-json",
       "/path/to/tmp/json"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "build.roll",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_TEXT@ (already at latest revisions)@@@",
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"picked_roll_details\": null, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"rejected_candidates_details\": [], @@@",
       "@@@STEP_LOG_LINE@json.output@  \"roll_details\": [], @@@",
       "@@@STEP_LOG_LINE@json.output@  \"success\": false, @@@",
       "@@@STEP_LOG_LINE@json.output@  \"trivial\": null@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "\nimport shutil, sys\nshutil.rmtree(sys.argv[1])\n",
       "[TMP_BASE]/roll_build_tmp_1"
     ],
-    "cwd": "[SLAVE_BUILD]",
     "name": "build.rmtree [TMP_BASE]/roll_build_tmp_1",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_LOG_LINE@python.inline@@@@",
       "@@@STEP_LOG_LINE@python.inline@import shutil, sys@@@",
       "@@@STEP_LOG_LINE@python.inline@shutil.rmtree(sys.argv[1])@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]