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    "cmd": [
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    "cmd": [
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    "cmd": [
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      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [
      "git",
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    "name": "checkout foo.set fetch.uriprotocols",
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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  {
    "cmd": [
      "git",
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    "timeout": 1200.0,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [
      "git",
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      "@@@STEP_NEST_LEVEL@1@@@"
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      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [
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    "name": "checkout foo.git clean",
    "timeout": 600.0,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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  {
    "cmd": [
      "git",
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      "HEAD"
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    "cwd": "[START_DIR]/project",
    "name": "checkout foo.git rev-parse (2)",
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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  {
    "cmd": [],
    "name": "checkout foo.apply foo:1234",
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      "@@@STEP_LINK@gerrit@https://foo-review.googlesource.com/c/1234@@@",
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    "cmd": [
      "git",
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    "name": "checkout foo.apply foo:1234.git fetch patch",
    "timeout": 1200.0,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@2@@@"
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    "cmd": [
      "git",
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    "timeout": 600.0,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@2@@@"
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  {
    "cmd": [
      "git",
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    "cwd": "[START_DIR]/project",
    "infra_step": true,
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@2@@@"
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    "cmd": [
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@2@@@"
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    "cmd": [
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    "~followup_annotations": [
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    "cmd": [
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@2@@@"
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    "cmd": [
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      "4"
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    "cwd": "[START_DIR]/project",
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@2@@@"
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    "cmd": [
      "python3",
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    "cmd": [],
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    "cmd": [],
    "name": "checkout foo.git log",
    "~followup_annotations": [
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    "cmd": [
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    "cmd": [],
    "name": "checkout foo.base",
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      "@@@SET_BUILD_PROPERTY@got_revision_type@\"submitted_commit_hash\"@@@"
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    "cmd": [
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    "infra_step": true,
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [
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    "~followup_annotations": [
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    "cmd": [
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      "submodule status filler text",
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    "infra_step": true,
    "name": "checkout foo.write submodule snapshot",
    "~followup_annotations": [
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      "@@@STEP_LOG_END@submodules.log@@@"
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    "cmd": [
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    "cmd": [
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    "cmd": [
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    "~followup_annotations": [
      "@@@STEP_SUMMARY_TEXT@2222222222222222222222222222222222222222@@@"
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    "cmd": [
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    "name": "read old revision",
    "~followup_annotations": [
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    "cmd": [],
    "name": "get roll direction",
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    "cmd": [
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      "2222222222222222222222222222222222222222"
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    "name": "get roll direction.is forward",
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      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [
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      "1111111111111111111111111111111111111111"
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    "name": "get roll direction.is backward",
    "timeout": 600.0,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [],
    "name": "txt_path",
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    "cmd": [],
    "name": "remote"
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    "cmd": [
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    "cmd": [
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [],
    "name": "foo.txt"
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    "cmd": [
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
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    "cmd": [
      "[START_DIR]/cipd_tool/path/to/gerrit/version%3Apinned-version/gerrit",
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      "-host",
      "https://pigweed-review.googlesource.com",
      "-input",
      "{\"params\": {\"q\": \"commit:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"}}",
      "-output",
      "/path/to/tmp/json"
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    "cwd": "[START_DIR]/project",
    "infra_step": true,
    "name": "foo.txt.get change-id",
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    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@",
      "@@@STEP_LOG_LINE@json.output@[@@@",
      "@@@STEP_LOG_LINE@json.output@  {@@@",
      "@@@STEP_LOG_LINE@json.output@    \"_number\": 12345@@@",
      "@@@STEP_LOG_LINE@json.output@  }@@@",
      "@@@STEP_LOG_LINE@json.output@]@@@",
      "@@@STEP_LOG_END@json.output@@@",
      "@@@STEP_LOG_LINE@json.input@{@@@",
      "@@@STEP_LOG_LINE@json.input@  \"params\": {@@@",
      "@@@STEP_LOG_LINE@json.input@    \"q\": \"commit:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\"@@@",
      "@@@STEP_LOG_LINE@json.input@  }@@@",
      "@@@STEP_LOG_LINE@json.input@}@@@",
      "@@@STEP_LOG_END@json.input@@@"
    ]
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    "cmd": [
      "[START_DIR]/cipd_tool/path/to/gerrit/version%3Apinned-version/gerrit",
      "change-detail",
      "-host",
      "https://pigweed-review.googlesource.com",
      "-input",
      "{\"change_id\": \"12345\"}",
      "-output",
      "/path/to/tmp/json"
    ],
    "cwd": "[START_DIR]/project",
    "infra_step": true,
    "name": "foo.txt.get 12345",
    "timeout": 600,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@",
      "@@@STEP_LOG_LINE@json.output@{@@@",
      "@@@STEP_LOG_LINE@json.output@  \"owner\": {@@@",
      "@@@STEP_LOG_LINE@json.output@    \"email\": \"author@example.com\", @@@",
      "@@@STEP_LOG_LINE@json.output@    \"name\": \"author\"@@@",
      "@@@STEP_LOG_LINE@json.output@  }, @@@",
      "@@@STEP_LOG_LINE@json.output@  \"reviewers\": {@@@",
      "@@@STEP_LOG_LINE@json.output@    \"REVIEWER\": [@@@",
      "@@@STEP_LOG_LINE@json.output@      {@@@",
      "@@@STEP_LOG_LINE@json.output@        \"email\": \"reviewer@example.com\", @@@",
      "@@@STEP_LOG_LINE@json.output@        \"name\": \"reviewer\"@@@",
      "@@@STEP_LOG_LINE@json.output@      }, @@@",
      "@@@STEP_LOG_LINE@json.output@      {@@@",
      "@@@STEP_LOG_LINE@json.output@        \"email\": \"nobody@google.com\", @@@",
      "@@@STEP_LOG_LINE@json.output@        \"name\": \"nobody\"@@@",
      "@@@STEP_LOG_LINE@json.output@      }, @@@",
      "@@@STEP_LOG_LINE@json.output@      {@@@",
      "@@@STEP_LOG_LINE@json.output@        \"email\": \"robot@gserviceaccount.com\", @@@",
      "@@@STEP_LOG_LINE@json.output@        \"name\": \"robot\"@@@",
      "@@@STEP_LOG_LINE@json.output@      }@@@",
      "@@@STEP_LOG_LINE@json.output@    ]@@@",
      "@@@STEP_LOG_LINE@json.output@  }@@@",
      "@@@STEP_LOG_LINE@json.output@}@@@",
      "@@@STEP_LOG_END@json.output@@@",
      "@@@STEP_LOG_LINE@json.input@{@@@",
      "@@@STEP_LOG_LINE@json.input@  \"change_id\": \"12345\"@@@",
      "@@@STEP_LOG_LINE@json.input@}@@@",
      "@@@STEP_LOG_END@json.input@@@",
      "@@@STEP_LINK@gerrit link@https://pigweed-review.googlesource.com/q/12345@@@"
    ]
  },
  {
    "cmd": [],
    "name": "roll message"
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  {
    "cmd": [],
    "name": "roll message.message for foo.txt",
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@",
      "@@@STEP_LOG_LINE@template@[roll {project_name}] {sanitized_message}@@@",
      "@@@STEP_LOG_LINE@template@@@@",
      "@@@STEP_LOG_LINE@template@{remote}@@@",
      "@@@STEP_LOG_LINE@template@{project_name} Rolled-Commits: {old_revision:.15}..{new_revision:.15}@@@",
      "@@@STEP_LOG_END@template@@@",
      "@@@STEP_LOG_LINE@kwargs@'new_revision': '2222222222222222222222222222222222222222'@@@",
      "@@@STEP_LOG_LINE@kwargs@'old_revision': '1111111111111111111111111111111111111111'@@@",
      "@@@STEP_LOG_LINE@kwargs@'original_message': 'foo\\nbar\\n\\nChange-Id: I1111'@@@",
      "@@@STEP_LOG_LINE@kwargs@'project_name': 'foo.txt'@@@",
      "@@@STEP_LOG_LINE@kwargs@'remote': 'https://pigweed.googlesource.com/pigweed/pigweed'@@@",
      "@@@STEP_LOG_LINE@kwargs@'sanitized_message': 'foo\\nbar\\n'@@@",
      "@@@STEP_LOG_END@kwargs@@@",
      "@@@STEP_LOG_LINE@message@[roll foo.txt] foo@@@",
      "@@@STEP_LOG_LINE@message@bar@@@",
      "@@@STEP_LOG_LINE@message@@@@",
      "@@@STEP_LOG_LINE@message@@@@",
      "@@@STEP_LOG_LINE@message@https://pigweed.googlesource.com/pigweed/pigweed@@@",
      "@@@STEP_LOG_LINE@message@foo.txt Rolled-Commits: 111111111111111..222222222222222@@@",
      "@@@STEP_LOG_END@message@@@"
    ]
  },
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    "cmd": [
      "git",
      "ls-files",
      "--modified",
      "--deleted",
      "--exclude-standard"
    ],
    "cwd": "[START_DIR]/co",
    "name": "check for no-op commit",
    "timeout": 60.0,
    "~followup_annotations": [
      "@@@STEP_LOG_LINE@stdout@hello@@@",
      "@@@STEP_LOG_END@stdout@@@"
    ]
  },
  {
    "cmd": [
      "git",
      "add",
      "--update"
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    "cwd": "[START_DIR]/co",
    "infra_step": true,
    "name": "git add",
    "timeout": 60.0
  },
  {
    "cmd": [
      "git",
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      "HEAD"
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    "cwd": "[START_DIR]/co",
    "infra_step": true,
    "name": "git rev-parse",
    "timeout": 60.0
  },
  {
    "cmd": [],
    "name": "calculate Change-Id",
    "~followup_annotations": [
      "@@@STEP_TEXT@Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad@@@"
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  {
    "cmd": [
      "git",
      "diff",
      "--unified=0",
      "--cached"
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    "cwd": "[START_DIR]/co",
    "infra_step": true,
    "name": "calculate Change-Id.git diff",
    "timeout": 60.0,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@diff --git a/foo.txt b/foo.txt@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@--- a/foo.txt@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@+++ b/foo.txt@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@@@ -16 +16 @@@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@-        foo = 5@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@+        foo = 6@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@diff --git a/bar.txt b/bar.txt@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@--- a/bar.txt@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@+++ b/bar.txt@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@@@ -5 +5 @@@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@-        bar = 0@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@+        bar = 1@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@@@@",
      "@@@STEP_LOG_END@diff (without hashes)@@@"
    ]
  },
  {
    "cmd": [
      "git",
      "hash-object",
      "diff --git a/foo.txt b/foo.txt\n--- a/foo.txt\n+++ b/foo.txt\n@@ -16 +16 @@\n-        foo = 5\n+        foo = 6\ndiff --git a/bar.txt b/bar.txt\n--- a/bar.txt\n+++ b/bar.txt\n@@ -5 +5 @@\n-        bar = 0\n+        bar = 1\n############"
    ],
    "cwd": "[START_DIR]/co",
    "infra_step": true,
    "name": "calculate Change-Id.git hash-object",
    "timeout": 60.0,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@"
    ]
  },
  {
    "cmd": [
      "[START_DIR]/cipd_tool/path/to/gerrit/version%3Apinned-version/gerrit",
      "change-query",
      "-host",
      "https://pigweed-review.googlesource.com",
      "-input",
      "{\"params\": {\"o\": [\"CURRENT_COMMIT\", \"CURRENT_REVISION\", \"MESSAGES\"], \"q\": \"change:pigweed/pigweed~main~Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad\"}}",
      "-output",
      "/path/to/tmp/json"
    ],
    "cwd": "[START_DIR]/co",
    "infra_step": true,
    "name": "check for identical roll",
    "timeout": 600,
    "~followup_annotations": [
      "@@@STEP_LOG_LINE@json.output@null@@@",
      "@@@STEP_LOG_END@json.output@@@",
      "@@@STEP_LOG_LINE@json.input@{@@@",
      "@@@STEP_LOG_LINE@json.input@  \"params\": {@@@",
      "@@@STEP_LOG_LINE@json.input@    \"o\": [@@@",
      "@@@STEP_LOG_LINE@json.input@      \"CURRENT_COMMIT\", @@@",
      "@@@STEP_LOG_LINE@json.input@      \"CURRENT_REVISION\", @@@",
      "@@@STEP_LOG_LINE@json.input@      \"MESSAGES\"@@@",
      "@@@STEP_LOG_LINE@json.input@    ], @@@",
      "@@@STEP_LOG_LINE@json.input@    \"q\": \"change:pigweed/pigweed~main~Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad\"@@@",
      "@@@STEP_LOG_LINE@json.input@  }@@@",
      "@@@STEP_LOG_LINE@json.input@}@@@",
      "@@@STEP_LOG_END@json.input@@@"
    ]
  },
  {
    "cmd": [
      "git",
      "commit",
      "-m",
      "[roll foo.txt] foo\nbar\n\n\nhttps://pigweed.googlesource.com/pigweed/pigweed\nfoo.txt Rolled-Commits: 111111111111111..222222222222222\nRoller-URL: https://ci.chromium.org/b/0\nCQ-Do-Not-Cancel-Tryjobs: true\nChange-Id: Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad",
      "-a",
      "--author",
      "author <author@pigweed.infra.roller.example.com>"
    ],
    "cwd": "[START_DIR]/co",
    "infra_step": true,
    "name": "git commit",
    "timeout": 600.0
  },
  {
    "cmd": [
      "git",
      "push",
      "--push-option",
      "nokeycheck",
      "origin",
      "HEAD:refs/for/main%l=Commit-Queue+2"
    ],
    "cwd": "[START_DIR]/co",
    "infra_step": true,
    "name": "git push",
    "timeout": 180.0,
    "~followup_annotations": [
      "@@@STEP_LOG_LINE@stdout@@@@",
      "@@@STEP_LOG_END@stdout@@@",
      "@@@STEP_LINK@gerrit link@https://pigweed-review.googlesource.com/q/pigweed/pigweed~main~Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad@@@"
    ]
  },
  {
    "cmd": [],
    "name": "check for completion"
  },
  {
    "cmd": [
      "[START_DIR]/cipd_tool/path/to/gerrit/version%3Apinned-version/gerrit",
      "change-detail",
      "-host",
      "https://pigweed-review.googlesource.com",
      "-input",
      "{\"change_id\": \"pigweed/pigweed~main~Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad\", \"params\": {\"o\": [\"CURRENT_REVISION\"]}}",
      "-output",
      "/path/to/tmp/json"
    ],
    "infra_step": true,
    "name": "check for completion.check if done (0)",
    "timeout": 600,
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@",
      "@@@STEP_LOG_LINE@json.output@{@@@",
      "@@@STEP_LOG_LINE@json.output@  \"current_revision\": \"abc123\", @@@",
      "@@@STEP_LOG_LINE@json.output@  \"labels\": {@@@",
      "@@@STEP_LOG_LINE@json.output@    \"Commit-Queue\": {@@@",
      "@@@STEP_LOG_LINE@json.output@      \"approved\": {}@@@",
      "@@@STEP_LOG_LINE@json.output@    }@@@",
      "@@@STEP_LOG_LINE@json.output@  }, @@@",
      "@@@STEP_LOG_LINE@json.output@  \"status\": \"MERGED\"@@@",
      "@@@STEP_LOG_LINE@json.output@}@@@",
      "@@@STEP_LOG_END@json.output@@@",
      "@@@STEP_LOG_LINE@json.input@{@@@",
      "@@@STEP_LOG_LINE@json.input@  \"change_id\": \"pigweed/pigweed~main~Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad\", @@@",
      "@@@STEP_LOG_LINE@json.input@  \"params\": {@@@",
      "@@@STEP_LOG_LINE@json.input@    \"o\": [@@@",
      "@@@STEP_LOG_LINE@json.input@      \"CURRENT_REVISION\"@@@",
      "@@@STEP_LOG_LINE@json.input@    ]@@@",
      "@@@STEP_LOG_LINE@json.input@  }@@@",
      "@@@STEP_LOG_LINE@json.input@}@@@",
      "@@@STEP_LOG_END@json.input@@@",
      "@@@STEP_LINK@gerrit link@https://pigweed-review.googlesource.com/q/pigweed/pigweed~main~Ib92a62842ab6b0cc6777dcd33fb1c8532c7396ad@@@"
    ]
  },
  {
    "name": "$result"
  }
]