Bug: sam build - UnicodeDecodeError

[KawashimaRyutaro]

Description:

When Run sam build --no-cached --debug
I get error as below:

Error: 'utf-8' codec can't decode byte 0x95 in position 147: invalid start byte

Steps to reproduce:

template.yaml

Transform: AWS::Serverless-2016-10-31
Globals:
  Function:
    Timeout: 3
Resources:
  HelloWorldFunction:
    Type: AWS::Serverless::Function
    Properties:
      CodeUri: hello-world/
      Handler: app.lambdaHandler
      Runtime: nodejs20.x
      Architectures:
        - x86_64
      Events:
        HelloWorld:
          Type: Api
          Properties:
            Path: /hello
            Method: get
    Metadata:
      BuildMethod: esbuild
      BuildProperties:
        Minify: true
        Target: "es2020"
        Sourcemap: true
        EntryPoints: 
        - app.ts

samconfig.toml

version = 0.1
[default.deploy.parameters]
capabilities = "CAPABILITY_IAM"
confirm_changeset = true
resolve_s3 = true

Observed result:

Error: 'utf-8' codec can't decode byte 0x95 in position 147: invalid start byte
Traceback:
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\click\core.py", line 1078, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\click\core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\click\core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\click\core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\cli\cli_config_file.py", line 347, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\click\decorators.py", line 92, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\click\core.py", line 783, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\telemetry\metric.py", line 185, in wrapped
    raise exception  # pylint: disable=raising-bad-type
    ^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\telemetry\metric.py", line 150, in wrapped
    return_value = func(*args, **kwargs)
                   ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\utils\version_checker.py", line 43, in wrapped
    actual_result = func(*args, **kwargs)
                    ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\cli\main.py", line 95, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\commands\build\command.py", line 169, in cli
    do_cli(
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\commands\build\command.py", line 258, in do_cli
    ctx.run()
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\commands\build\build_context.py", line 284, in run
    self._build_result = builder.build()
                         ^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\build\app_builder.py", line 192, in build
    build_graph = self._get_build_graph(self._container_env_var, self._container_env_var_file)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\build\app_builder.py", line 236, in _get_build_graph
    build_graph = BuildGraph(self._build_dir)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\build\build_graph.py", line 209, in __init__
    self._atomic_read()
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\build\build_graph.py", line 443, in _atomic_read
    self._read()
  File "C:\Program Files\Amazon\AWSSAMCLI\runtime\Lib\site-packages\samcli\lib\build\build_graph.py", line 415, in _read
    txt = self._filepath.read_text()
          ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "pathlib.py", line 1028, in read_text
  File "<frozen codecs>", line 322, in decode

An unexpected error was encountered while executing "sam build".
Search for an existing issue:
https://github.com/aws/aws-sam-cli/issues?q=is%3Aissue+is%3Aopen+Bug%3A%20sam%20build%20-%20UnicodeDecodeError
Or create a bug report:
https://github.com/aws/aws-sam-cli/issues/new?template=Bug_report.md&title=Bug%3A%20sam%20build%20-%20UnicodeDecodeError

Expected result:

sam build success

Additional environment details (Ex: Windows, Mac, Amazon Linux etc)

1. OS:Windows 10
2. sam --version:SAM CLI, version 1.125.0
3. AWS region:ap-northeast-1
4. Python:Python 3.12.4 (tags/v3.12.4:8e8a4ba, Jun 6 2024, 19:30:16) [MSC v.1940 64 bit (AMD64)] on win32

# Paste the output of `sam --info` here
{
  "version": "1.125.0",
  "system": {
    "python": "3.12.6",
    "os": "Windows-10-10.0.19045-SP0"
  },
  "additional_dependencies": {
    "docker_engine": "24.0.6",
    "aws_cdk": "Not available",
    "terraform": "Not available"
  },
  "available_beta_feature_env_vars": [
    "SAM_CLI_BETA_FEATURES",
    "SAM_CLI_BETA_BUILD_PERFORMANCE",
    "SAM_CLI_BETA_TERRAFORM_SUPPORT",
    "SAM_CLI_BETA_RUST_CARGO_LAMBDA"
  ]
}

Add --debug flag to command you are running

[mndeveci]

Can you delete your .aws-sam folder and retry?

Also, it will be useful if you can provide an example project we can use to re-produce on our side.

[KawashimaRyutaro]

Thank you for your response.

When I delete my .aws-sam folder and retry, I can sam build !

[mndeveci]

Glad to hear that. .aws-sam folder should only be edited by SAM CLI, my assumption is an external tool changed or deleted a file which caused this problem.

Resolving this issue now but please let us know if you experience another problem in the future.

[github-actions]

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