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      "@@@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': 'HASH'@@@",
      "@@@STEP_LOG_LINE@kwargs@'old_revision': 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'@@@",
      "@@@STEP_LOG_LINE@kwargs@'original_message': 'module: Short commit summary\\n\\nLonger commit details.\\n\\nBug: 123\\nChange-Id: I4444444444444444444444444444444444444444\\nReviewed-On: https://pigweed-review.googlesource.com/c/project/+/44444'@@@",
      "@@@STEP_LOG_LINE@kwargs@'project_name': 'ham'@@@",
      "@@@STEP_LOG_LINE@kwargs@'remote': 'https://pigweed.googlesource.com/pigweed/pigweed'@@@",
      "@@@STEP_LOG_LINE@kwargs@'sanitized_message': 'module: Short commit summary\\n\\nLonger commit details.\\n\\nOriginal-Bug: 123\\nReviewed-On: https://pigweed-review.googlesource.com/c/project/+/44444'@@@",
      "@@@STEP_LOG_END@kwargs@@@",
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      "@@@STEP_LOG_LINE@message@@@@",
      "@@@STEP_LOG_LINE@message@Longer commit details.@@@",
      "@@@STEP_LOG_LINE@message@@@@",
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      "@@@STEP_LOG_LINE@message@ham Rolled-Commits: aaaaaaaaaaaaaaa..HASH@@@",
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    "cmd": [],
    "name": "roll message.message for spam",
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      "@@@STEP_LOG_LINE@kwargs@'original_message': 'module: Short commit summary\\n\\nLonger commit details.\\n\\nBug: 123\\nChange-Id: I2222222222222222222222222222222222222222\\nReviewed-On: https://pigweed-review.googlesource.com/c/project/+/22222'@@@",
      "@@@STEP_LOG_LINE@kwargs@'project_name': 'spam'@@@",
      "@@@STEP_LOG_LINE@kwargs@'remote': 'https://pigweed.googlesource.com/pigweed/pigweed'@@@",
      "@@@STEP_LOG_LINE@kwargs@'sanitized_message': 'module: Short commit summary\\n\\nLonger commit details.\\n\\nOriginal-Bug: 123\\nReviewed-On: https://pigweed-review.googlesource.com/c/project/+/22222'@@@",
      "@@@STEP_LOG_END@kwargs@@@",
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      "@@@STEP_LOG_LINE@message@@@@",
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      "@@@STEP_LOG_LINE@message@@@@",
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      "@@@STEP_LOG_LINE@message@spam Rolled-Commits: 111111111111111..222222222222222@@@",
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    "name": "check for no-op commit",
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    "name": "git add"
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        "hostname": "rdbhost"
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    "name": "git rev-parse"
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  {
    "cmd": [],
    "name": "calculate Change-Id",
    "~followup_annotations": [
      "@@@STEP_TEXT@I27ec3e6a65adbbeb0f5d0b74ef7036a069efcfe8@@@"
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  {
    "cmd": [
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        "hostname": "rdbhost"
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    },
    "name": "calculate Change-Id.git diff",
    "~followup_annotations": [
      "@@@STEP_NEST_LEVEL@1@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@diff --git a/foo.txt b/foo.txt@@@",
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      "@@@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@@@",
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      "@@@STEP_LOG_LINE@diff (without hashes)@+++ b/bar.txt@@@",
      "@@@STEP_LOG_LINE@diff (without hashes)@@@ -5 +5 @@@@@",
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      "@@@STEP_LOG_LINE@diff (without hashes)@+        bar = 1@@@",
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    "cmd": [
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    "cwd": "[START_DIR]/checkout",
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        "hostname": "rdbhost"
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    },
    "name": "calculate Change-Id.git hash-object",
    "~followup_annotations": [
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  },
  {
    "cmd": [
      "[CACHE]/cipd/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~I27ec3e6a65adbbeb0f5d0b74ef7036a069efcfe8\"}}",
      "-output",
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    "cwd": "[START_DIR]/checkout",
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    "luci_context": {
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          "update_token": "token"
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        "hostname": "rdbhost"
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    },
    "name": "check for identical roll",
    "timeout": 600,
    "~followup_annotations": [
      "@@@STEP_LOG_LINE@json.output@null@@@",
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      "@@@STEP_LOG_LINE@json.input@{@@@",
      "@@@STEP_LOG_LINE@json.input@  \"params\": {@@@",
      "@@@STEP_LOG_LINE@json.input@    \"o\": [@@@",
      "@@@STEP_LOG_LINE@json.input@      \"CURRENT_COMMIT\", @@@",
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      "@@@STEP_LOG_LINE@json.input@      \"MESSAGES\"@@@",
      "@@@STEP_LOG_LINE@json.input@    ], @@@",
      "@@@STEP_LOG_LINE@json.input@    \"q\": \"change:pigweed/pigweed~main~I27ec3e6a65adbbeb0f5d0b74ef7036a069efcfe8\"@@@",
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      "@@@STEP_LOG_LINE@json.input@}@@@",
      "@@@STEP_LOG_END@json.input@@@"
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  {
    "cmd": [
      "git",
      "commit",
      "-m",
      "[roll ham, spam] Roll 2 commits\n\n[roll ham] module: Short commit summary\n\nLonger commit details.\n\nOriginal-Bug: 123\nReviewed-On: https://pigweed-review.googlesource.com/c/project/+/44444\n\nhttps://pigweed.googlesource.com/pigweed/pigweed\nham Rolled-Commits: aaaaaaaaaaaaaaa..HASH\n\n[roll spam] module: Short commit summary\n\nLonger commit details.\n\nOriginal-Bug: 123\nReviewed-On: https://pigweed-review.googlesource.com/c/project/+/22222\n\nhttps://pigweed.googlesource.com/pigweed/pigweed\nspam Rolled-Commits: 111111111111111..222222222222222\n\n\nRoller-URL: https://ci.chromium.org/b/8945511751514863184\nCq-Cl-Tag: roller-builder:builder\nCq-Cl-Tag: roller-bid:8945511751514863184\nCQ-Do-Not-Cancel-Tryjobs: true\nChange-Id: I27ec3e6a65adbbeb0f5d0b74ef7036a069efcfe8",
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    "cwd": "[START_DIR]/checkout",
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        "hostname": "rdbhost"
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    "name": "git commit"
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  {
    "cmd": [
      "git",
      "push",
      "--push-option",
      "nokeycheck",
      "origin",
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    "cwd": "[START_DIR]/checkout",
    "infra_step": true,
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        "hostname": "rdbhost"
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    },
    "name": "git push",
    "timeout": 180.0,
    "~followup_annotations": [
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      "@@@STEP_LOG_END@stdout@@@",
      "@@@STEP_LINK@gerrit link@https://pigweed-review.googlesource.com/q/pigweed/pigweed~main~I27ec3e6a65adbbeb0f5d0b74ef7036a069efcfe8@@@"
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  {
    "cmd": [],
    "name": "check for completion"
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  {
    "cmd": [
      "[CACHE]/cipd/path/to/gerrit/version%3Apinned-version/gerrit",
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      "-input",
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    "infra_step": true,
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      "@@@STEP_LOG_LINE@json.output@      \"tag\": \"autogenerated:cv\"@@@",
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      "[CACHE]/cipd/path/to/gerrit/version%3Apinned-version/gerrit",
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    "name": "abandon roll",
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    "~followup_annotations": [
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  {
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]