diff --git a/recipes/copy_roller.expected/success.json b/recipes/copy_roller.expected/success.json
new file mode 100644
index 0000000..33e5d6f
--- /dev/null
+++ b/recipes/copy_roller.expected/success.json
@@ -0,0 +1,1750 @@
+[
+  {
+    "cmd": [],
+    "name": "checkout pigweed"
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.options",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_SUMMARY_TEXT@remote: \"https://pigweed.googlesource.com/pigweed/pigweed\"\nbranch: \"main\"\ninitialize_submodules: true\nmatch_branch: true\n@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.options with defaults",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_SUMMARY_TEXT@remote: \"https://pigweed.googlesource.com/pigweed/pigweed\"\nbranch: \"main\"\nmanifest_file: \"default.xml\"\ninitialize_submodules: true\nrepo_init_timeout_sec: 20\nrepo_sync_timeout_sec: 120\nnumber_of_attempts: 3\nmatch_branch: true\nsubmodule_timeout_sec: 600\n@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.not matching branch names",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_SUMMARY_TEXT@miss@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0o777",
+      "[CACHE]/git"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.cache.ensure git cache dir",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "",
+      "[CACHE]/git/.GUARD_FILE"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.cache.write git cache guard file",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0o777",
+      "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.cache.makedirs",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "init"
+    ],
+    "cwd": "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+    "infra_step": true,
+    "name": "checkout pigweed.cache.git init",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "config",
+      "remote.origin.url",
+      "https://pigweed.googlesource.com/pigweed/pigweed"
+    ],
+    "cwd": "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+    "infra_step": true,
+    "name": "checkout pigweed.cache.remote set-url",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "config",
+      "fetch.uriprotocols",
+      "https"
+    ],
+    "cwd": "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+    "infra_step": true,
+    "name": "checkout pigweed.cache.set fetch.uriprotocols",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.cache.timeout 10s",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "--prune",
+      "--tags",
+      "--jobs",
+      "4",
+      "origin",
+      "--recurse-submodules"
+    ],
+    "cwd": "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+    "infra_step": true,
+    "name": "checkout pigweed.cache.git fetch",
+    "timeout": 1200.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "merge",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+    "infra_step": true,
+    "name": "checkout pigweed.cache.git merge",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+    "infra_step": true,
+    "name": "checkout pigweed.cache.git submodule sync",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.cache.timeout 10s (2)",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive",
+      "--force",
+      "--jobs",
+      "4"
+    ],
+    "cwd": "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+    "infra_step": true,
+    "name": "checkout pigweed.cache.git submodule update",
+    "timeout": 600,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CACHE]/git/.GUARD_FILE"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.cache.remove git cache guard file",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "--symlinks",
+      "[CACHE]/git/pigweed.googlesource.com-pigweed-pigweed",
+      "[START_DIR]/co"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.copy from cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.git checkout",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.git checkout.timeout 10s",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0o777",
+      "[START_DIR]/co"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "deadline": {
+        "grace_period": 30.0,
+        "soft_deadline": 1337000019.0
+      }
+    },
+    "name": "checkout pigweed.git checkout.makedirs",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "init"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.git init",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "remote",
+      "add",
+      "origin",
+      "https://pigweed.googlesource.com/pigweed/pigweed"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.git remote",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "config",
+      "core.longpaths",
+      "true"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.set core.longpaths",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "config",
+      "fetch.uriprotocols",
+      "https"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.set fetch.uriprotocols",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "--tags",
+      "--jobs",
+      "4",
+      "origin",
+      "main",
+      "--recurse-submodules"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.git fetch",
+    "timeout": 1200.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.git checkout",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.git rev-parse",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.git clean",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.git checkout.submodule",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.submodule.git submodule sync",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive",
+      "--force",
+      "--jobs",
+      "4"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "checkout pigweed.git checkout.submodule.git submodule update",
+    "timeout": 600,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout pigweed.git log",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "log",
+      "--oneline",
+      "-n",
+      "10"
+    ],
+    "cwd": "[START_DIR]/co",
+    "name": "checkout pigweed.git log.[START_DIR]/co",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-f",
+      "-d"
+    ],
+    "cwd": "[START_DIR]/co",
+    "name": "checkout pigweed.git clean",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "status"
+    ],
+    "cwd": "[START_DIR]/co",
+    "name": "checkout pigweed.git status",
+    "timeout": 600.0,
+    "~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",
+      "0o777",
+      "[START_DIR]/snapshot"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.mkdir",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "status",
+      "--recursive"
+    ],
+    "cwd": "[START_DIR]/co",
+    "name": "checkout pigweed.submodule-status",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "submodule status filler text",
+      "[START_DIR]/snapshot/submodules.log"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.write submodule snapshot",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@submodules.log@submodule status filler text@@@",
+      "@@@STEP_LOG_END@submodules.log@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "log",
+      "--oneline",
+      "-n",
+      "10"
+    ],
+    "cwd": "[START_DIR]/co",
+    "name": "checkout pigweed.log",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "",
+      "[START_DIR]/snapshot/git.log"
+    ],
+    "infra_step": true,
+    "name": "checkout pigweed.write git log",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@git.log@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout source",
+    "~followup_annotations": [
+      "@@@STEP_LINK@applied host:1234 (.)@https://host-review.googlesource.com/c/1234@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout source.options",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_SUMMARY_TEXT@remote: \"http://host/source\"\nbranch: \"main\"\nuse_trigger: true\n@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout source.options with defaults",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_SUMMARY_TEXT@remote: \"http://host/source\"\nbranch: \"main\"\nmanifest_file: \"default.xml\"\nrepo_init_timeout_sec: 20\nrepo_sync_timeout_sec: 120\nnumber_of_attempts: 3\nsubmodule_timeout_sec: 600\nuse_trigger: true\n@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout source.change data",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "ls-remote",
+      "--heads",
+      "http://host/source",
+      "main"
+    ],
+    "name": "checkout source.change data.git ls-remote",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@",
+      "@@@STEP_LOG_LINE@stdout@h3ll0\trefs/heads/main@@@",
+      "@@@STEP_LOG_END@stdout@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout source.change data.ensure infra/tools/luci/gerrit/${platform}",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout source.change data.ensure infra/tools/luci/gerrit/${platform}.get packages",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "RECIPE_MODULE[fuchsia::gerrit]/resources/cipd.ensure",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "checkout source.change data.ensure infra/tools/luci/gerrit/${platform}.get packages.read ensure file",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@",
+      "@@@STEP_LOG_LINE@cipd.ensure@infra/tools/luci/gerrit/${platform} version:pinned-version@@@",
+      "@@@STEP_LOG_END@cipd.ensure@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "checkout source.change data.ensure infra/tools/luci/gerrit/${platform}.install infra/tools/luci/gerrit",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@3@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0o777",
+      "[START_DIR]/cipd_tool/infra/tools/luci/gerrit/0e548aa33f8113a45a5b3b62201e114e98e63d00f97296912380138f44597b07"
+    ],
+    "infra_step": true,
+    "name": "checkout source.change data.ensure infra/tools/luci/gerrit/${platform}.install infra/tools/luci/gerrit.ensure package directory",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[START_DIR]/cipd_tool/infra/tools/luci/gerrit/0e548aa33f8113a45a5b3b62201e114e98e63d00f97296912380138f44597b07",
+      "-ensure-file",
+      "infra/tools/luci/gerrit/${platform} version:pinned-version",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "name": "checkout source.change data.ensure infra/tools/luci/gerrit/${platform}.install infra/tools/luci/gerrit.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@4@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-version:pinned-v\",@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/luci/gerrit/resolved-platform\"@@@",
+      "@@@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@@@"
+    ]
+  },
+  {
+    "cmd": [
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+      "change-query",
+      "-host",
+      "https://host-review.googlesource.com",
+      "-input",
+      "{\"params\": {\"q\": \"commit:h3ll0\"}}",
+      "-output",
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+    "name": "checkout source.change data.number",
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+      "@@@STEP_LOG_LINE@json.output@    \"_number\": \"1234\",@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"branch\": \"main\",@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"project\": \"pigweed\"@@@",
+      "@@@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:h3ll0\"@@@",
+      "@@@STEP_LOG_LINE@json.input@  }@@@",
+      "@@@STEP_LOG_LINE@json.input@}@@@",
+      "@@@STEP_LOG_END@json.input@@@"
+    ]
+  },
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+    "name": "checkout source.change data.changes",
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+    ]
+  },
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+  {
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+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
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+      "/path/to/tmp/json",
+      "copy",
+      "",
+      "[CACHE]/git/.GUARD_FILE"
+    ],
+    "infra_step": true,
+    "name": "checkout source.cache.write git cache guard file",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0o777",
+      "[CACHE]/git/host-source"
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+    "infra_step": true,
+    "name": "checkout source.cache.makedirs",
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+    "name": "checkout source.cache.git init",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "remote.origin.url",
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+    "infra_step": true,
+    "name": "checkout source.cache.remote set-url",
+    "timeout": 300.0,
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+  {
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+      "https"
+    ],
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+    "infra_step": true,
+    "name": "checkout source.cache.set fetch.uriprotocols",
+    "timeout": 300.0,
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+      "4",
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+    "infra_step": true,
+    "name": "checkout source.cache.git fetch",
+    "timeout": 1200.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
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+    "infra_step": true,
+    "name": "checkout source.cache.git merge",
+    "timeout": 600.0,
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+    "cmd": [],
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+    "name": "checkout source.cache.git submodule update",
+    "timeout": 600,
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "--json-output",
+      "/path/to/tmp/json",
+      "remove",
+      "[CACHE]/git/.GUARD_FILE"
+    ],
+    "infra_step": true,
+    "name": "checkout source.cache.remove git cache guard file",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "--symlinks",
+      "[CACHE]/git/host-source",
+      "[START_DIR]/project"
+    ],
+    "infra_step": true,
+    "name": "checkout source.copy from cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
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+    "name": "checkout source.git checkout.timeout 10s",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0o777",
+      "[START_DIR]/project"
+    ],
+    "infra_step": true,
+    "luci_context": {
+      "deadline": {
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+        "soft_deadline": 1337000028.0
+      }
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+    "name": "checkout source.git checkout.makedirs",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+    "name": "checkout source.git checkout.git init",
+    "timeout": 300.0,
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+    "name": "checkout source.git checkout.git remote",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+    "infra_step": true,
+    "name": "checkout source.git checkout.set core.longpaths",
+    "timeout": 300.0,
+    "~followup_annotations": [
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+    "infra_step": true,
+    "name": "checkout source.git checkout.set fetch.uriprotocols",
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+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "git",
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+      "--tags",
+      "--jobs",
+      "4",
+      "origin",
+      "main"
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+    "infra_step": true,
+    "name": "checkout source.git checkout.git fetch",
+    "timeout": 1200.0,
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+    "name": "checkout source.git checkout.git checkout",
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+    "name": "checkout source.git checkout.git clean",
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+    "name": "checkout source.git rev-parse",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
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+  },
+  {
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+    "name": "checkout source.apply host:1234",
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+      "@@@STEP_LINK@gerrit@https://host-review.googlesource.com/c/1234@@@",
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+  {
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+    "name": "checkout source.apply host:1234.timeout 10s",
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+    "infra_step": true,
+    "name": "checkout source.apply host:1234.git fetch patch",
+    "timeout": 1200.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "-b",
+      "working",
+      "FETCH_HEAD"
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+    "infra_step": true,
+    "name": "checkout source.apply host:1234.git checkout patch",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "git",
+      "remote",
+      "add",
+      "http___host_source",
+      "http://host/source"
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+    "infra_step": true,
+    "name": "checkout source.apply host:1234.git remote add",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+    "name": "checkout source.apply host:1234.timeout 10s (2)",
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+      "@@@STEP_NEST_LEVEL@2@@@"
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+      "--jobs",
+      "4",
+      "http___host_source",
+      "refs/heads/main"
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+    "infra_step": true,
+    "name": "checkout source.apply host:1234.git fetch branch",
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+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@2@@@"
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+  {
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+      "branch",
+      "--set-upstream-to=http___host_source/main"
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+    "name": "checkout source.apply host:1234.git set upstream",
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+      "10"
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+    "name": "checkout source.apply host:1234.post-rebase log",
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+    "name": "checkout source.apply host:1234.timeout 10s (3)",
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+    "name": "checkout source.apply host:1234.detach",
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+    "name": "checkout source.apply host:1234.git submodule update",
+    "timeout": 600,
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+  {
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+      "RECIPE_MODULE[pigweed::checkout]/resources/submodule_status.py",
+      "[START_DIR]/project",
+      "/path/to/tmp/json",
+      "--recursive"
+    ],
+    "cwd": "[START_DIR]/project",
+    "name": "checkout source.submodule status",
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+    "name": "checkout source.matching host:1234",
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+      "@@@STEP_LINK@gitiles@http://host/source/+/h3ll0@@@"
+    ]
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+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
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+      "copy",
+      "[{\"applied\": true, \"base\": \"HEAD_HEAD_HEAD_HEAD_HEAD_HEAD_HEAD_HEAD_\", \"base_type\": \"submitted_commit_hash\", \"branch\": \"main\", \"commit_message\": \"\", \"current_revision\": null, \"gerrit_name\": \"host\", \"is_merge\": false, \"number\": 1234, \"patchset\": null, \"path\": \".\", \"project\": null, \"rebase\": false, \"ref\": \"h3ll0\", \"remote\": \"http://host/source\", \"submitted\": true, \"topic\": null}]",
+      "[CLEANUP]/tmp_tmp_1"
+    ],
+    "cwd": "[START_DIR]/project",
+    "infra_step": true,
+    "name": "checkout source.write changes.json",
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+      "@@@STEP_LOG_END@tmp_tmp_1@@@"
+    ]
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+    "name": "checkout source.git log",
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+      "log",
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+      "-n",
+      "10"
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+    "name": "checkout source.git log.[START_DIR]/project",
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+      "@@@STEP_NEST_LEVEL@2@@@"
+    ]
+  },
+  {
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+    "name": "checkout source.base",
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+      "@@@SET_BUILD_PROPERTY@got_revision_type@\"submitted_commit_hash\"@@@"
+    ]
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+      "@@@STEP_NEST_LEVEL@1@@@"
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+    "name": "checkout source.status",
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+    ]
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+      "--json-output",
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+      "ensure-directory",
+      "--mode",
+      "0o777",
+      "[START_DIR]/snapshot"
+    ],
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+      "submodule",
+      "status",
+      "--recursive"
+    ],
+    "cwd": "[START_DIR]/project",
+    "name": "checkout source.submodule-status",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "submodule status filler text",
+      "[START_DIR]/snapshot/submodules.log"
+    ],
+    "infra_step": true,
+    "name": "checkout source.write submodule snapshot",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@submodules.log@submodule status filler text@@@",
+      "@@@STEP_LOG_END@submodules.log@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "log",
+      "--oneline",
+      "-n",
+      "10"
+    ],
+    "cwd": "[START_DIR]/project",
+    "name": "checkout source.log",
+    "timeout": 600.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "",
+      "[START_DIR]/snapshot/git.log"
+    ],
+    "infra_step": true,
+    "name": "checkout source.write git log",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@git.log@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/co/path/to/source.txt",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "read"
+  },
+  {
+    "cmd": [
+      "vpython3",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "v1.0",
+      "[START_DIR]/project/path/to/destination.txt"
+    ],
+    "infra_step": true,
+    "name": "write"
+  },
+  {
+    "cmd": [
+      "git",
+      "ls-files",
+      "--modified",
+      "--deleted",
+      "--exclude-standard"
+    ],
+    "cwd": "[START_DIR]/co",
+    "name": "check for no-op commit",
+    "timeout": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@stdout@hello@@@",
+      "@@@STEP_LOG_END@stdout@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "add",
+      "--update"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "git add",
+    "timeout": 300.0
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "git rev-parse",
+    "timeout": 300.0
+  },
+  {
+    "cmd": [],
+    "name": "calculate Change-Id",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@Ic42e2adc21e51877c21ce043876310f40a23ba91@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "diff",
+      "--unified=0",
+      "--cached"
+    ],
+    "cwd": "[START_DIR]/co",
+    "infra_step": true,
+    "name": "calculate Change-Id.git diff",
+    "timeout": 300.0,
+    "~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": 300.0,
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[START_DIR]/cipd_tool/infra/tools/luci/gerrit/0e548aa33f8113a45a5b3b62201e114e98e63d00f97296912380138f44597b07/gerrit",
+      "change-query",
+      "-host",
+      "https://pigweed-review.googlesource.com",
+      "-input",
+      "{\"params\": {\"o\": [\"CURRENT_COMMIT\", \"CURRENT_REVISION\", \"MESSAGES\", \"DETAILED_ACCOUNTS\"], \"q\": \"change:pigweed/pigweed~main~Ic42e2adc21e51877c21ce043876310f40a23ba91\"}}",
+      "-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@[]@@@",
+      "@@@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@      \"DETAILED_ACCOUNTS\"@@@",
+      "@@@STEP_LOG_LINE@json.input@    ],@@@",
+      "@@@STEP_LOG_LINE@json.input@    \"q\": \"change:pigweed/pigweed~main~Ic42e2adc21e51877c21ce043876310f40a23ba91\"@@@",
+      "@@@STEP_LOG_LINE@json.input@  }@@@",
+      "@@@STEP_LOG_LINE@json.input@}@@@",
+      "@@@STEP_LOG_END@json.input@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "commit",
+      "-m",
+      "roll: path/to/destination.txt: v1.0\n\nRoller-URL: https://ci.chromium.org/b/0\nCQ-Do-Not-Cancel-Tryjobs: true\nChange-Id: Ic42e2adc21e51877c21ce043876310f40a23ba91",
+      "-a",
+      "--no-verify"
+    ],
+    "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~Ic42e2adc21e51877c21ce043876310f40a23ba91@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "output gerrit change id",
+    "~followup_annotations": [
+      "@@@SET_BUILD_PROPERTY@gerrit_changes@[{\"change_id\": \"pigweed/pigweed~main~Ic42e2adc21e51877c21ce043876310f40a23ba91\", \"host\": \"pigweed-review.googlesource.com\"}]@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "check for completion"
+  },
+  {
+    "cmd": [
+      "[START_DIR]/cipd_tool/infra/tools/luci/gerrit/0e548aa33f8113a45a5b3b62201e114e98e63d00f97296912380138f44597b07/gerrit",
+      "change-detail",
+      "-host",
+      "https://pigweed-review.googlesource.com",
+      "-input",
+      "{\"change_id\": \"pigweed/pigweed~main~Ic42e2adc21e51877c21ce043876310f40a23ba91\", \"params\": {\"o\": [\"CURRENT_REVISION\", \"DETAILED_ACCOUNTS\"]}}",
+      "-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@      \"all\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@        {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"value\": 2@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      ],@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"approved\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"email\": \"roller@fuchsia-service-account.com\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@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~Ic42e2adc21e51877c21ce043876310f40a23ba91\",@@@",
+      "@@@STEP_LOG_LINE@json.input@  \"params\": {@@@",
+      "@@@STEP_LOG_LINE@json.input@    \"o\": [@@@",
+      "@@@STEP_LOG_LINE@json.input@      \"CURRENT_REVISION\",@@@",
+      "@@@STEP_LOG_LINE@json.input@      \"DETAILED_ACCOUNTS\"@@@",
+      "@@@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~Ic42e2adc21e51877c21ce043876310f40a23ba91@@@"
+    ]
+  },
+  {
+    "name": "$result",
+    "summaryMarkdown": "Roll succeeded. [gerrit link](https://pigweed-review.googlesource.com/q/pigweed/pigweed~main~Ic42e2adc21e51877c21ce043876310f40a23ba91)"
+  }
+]
\ No newline at end of file
diff --git a/recipes/copy_roller.proto b/recipes/copy_roller.proto
new file mode 100644
index 0000000..97a4956
--- /dev/null
+++ b/recipes/copy_roller.proto
@@ -0,0 +1,40 @@
+// Copyright 2024 The Pigweed Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+syntax = "proto3";
+
+package recipes.pigweed.copy_roller;
+
+import "recipe_modules/fuchsia/auto_roller/options.proto";
+import "recipe_modules/pigweed/checkout/options.proto";
+
+message InputProperties {
+  // Repository containing the source file. Required.
+  string source_project_remote = 1;
+
+  // Branch of source repository. Defaults to 'main'.
+  string source_project_branch = 2;
+
+  // The path of the source file. Required.
+  string source_path = 3;
+
+  // Checkout module options.
+  recipe_modules.pigweed.checkout.Options checkout_options = 4;
+
+  // The path of the destination file in the checkout. Required.
+  string destination_path = 5;
+
+  // Auto roller module options.
+  recipe_modules.fuchsia.auto_roller.Options auto_roller_options = 6;
+}
diff --git a/recipes/copy_roller.py b/recipes/copy_roller.py
new file mode 100644
index 0000000..17afb42
--- /dev/null
+++ b/recipes/copy_roller.py
@@ -0,0 +1,105 @@
+# Copyright 2024 The Pigweed Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License. You may obtain a copy of
+# the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations under
+# the License.
+"""Automatically copy a file from one repository to another."""
+
+import re
+from typing import Generator
+
+import attrs
+from PB.go.chromium.org.luci.buildbucket.proto import common as common_pb2
+from PB.recipes.pigweed.copy_roller import InputProperties
+from PB.recipe_modules.pigweed.checkout.options import (
+    Options as CheckoutOptions,
+)
+from recipe_engine import post_process, recipe_api, recipe_test_api
+
+DEPS = [
+    'fuchsia/auto_roller',
+    'pigweed/checkout',
+    'recipe_engine/file',
+    'recipe_engine/path',
+    'recipe_engine/properties',
+]
+
+PROPERTIES = InputProperties
+
+
+def RunSteps(  # pylint: disable=invalid-name
+    api: recipe_api.RecipeScriptApi,
+    props: InputProperties,
+):
+    # The checkout module will try to use trigger data to pull in a specific
+    # patch. Since the triggering commit is in a different repository that
+    # needs to be disabled.
+    props.checkout_options.use_trigger = False
+    checkout = api.checkout(props.checkout_options)
+
+    project_dir = api.path.start_dir / 'project'
+    project_checkout = api.checkout(
+        CheckoutOptions(
+            remote=props.source_project_remote,
+            branch=props.source_project_branch or 'main',
+            use_trigger=True,
+        ),
+        root=project_dir,
+    )
+
+    value = api.file.read_raw('read', checkout.root / props.source_path)
+    api.file.write_raw(
+        'write',
+        project_dir / props.destination_path,
+        value,
+    )
+
+    commit_message: str = f'roll: {props.destination_path}'
+
+    try:
+        value_string = value.decode()
+        if '\n' not in value_string:
+            new_commit_message = f'{commit_message}: {value_string.strip()}'
+            if len(new_commit_message) <= 72:
+                commit_message = new_commit_message
+
+    except UnicodeDecodeError:  # pragma: no cover
+        pass
+
+    change = api.auto_roller.attempt_roll(
+        props.auto_roller_options,
+        repo_dir=checkout.root,
+        commit_message=commit_message,
+    )
+
+    return api.auto_roller.raw_result(change)
+
+
+def GenTests(api) -> Generator[recipe_test_api.TestData, None, None]:
+    """Create tests."""
+
+    def properties(**kwargs):
+        props = InputProperties(**kwargs)
+        props.source_project_remote = 'http://host/source'
+        props.source_path = 'path/to/source.txt'
+        props.destination_path = 'path/to/destination.txt'
+        props.checkout_options.CopyFrom(api.checkout.git_options())
+        props.auto_roller_options.CopyFrom(
+            api.auto_roller.Options(remote=api.checkout.pigweed_repo)
+        )
+        return api.properties(props)
+
+    yield api.test(
+        'success',
+        properties(),
+        api.step_data('read', api.file.read_raw(b'v1.0')),
+        api.auto_roller.success(),
+    )