Python subprocess check_output FileNotFoundError: [Errno 2] No such file or directory

Question

我编写了一个小 Python 脚本来构建和测试我的那个项目的 docker 镜像。该脚本在本地运行良好，但在 check_output 期间远程失败。

构建.py

    print(check_output(["which", "dgoss"]))
    result = str(check_output(["dgoss", "run", image_tag], cwd=image_path, stderr=subprocess.DEVNULL))

.gitlab-ci.yml

    before_script:
      - curl -fsSL https://goss.rocks/install | sh
      - ls -la /usr/local/bin/ | grep goss
    script:
      - which dgoss
      - python3 ./infrastructure/build.py

输出

dgoss master has been installed to /usr/local/bin/dgoss
$ ls -la /usr/local/bin/ | grep goss
-rwxr-xr-x    1 root     root          3803 May 17 08:58 dgoss
-rwxr-xr-x    1 root     root       8524064 May 17 08:58 goss
$ which dgoss
/usr/local/bin/dgoss
$ python3 ./infrastructure/build.py
infrastructure/broker
b'/usr/local/bin/dgoss\n'
Traceback (most recent call last):
  File "./infrastructure/build.py", line 54, in <module>
    test()
  File "./infrastructure/build.py", line 42, in test
    result = str(check_output(["dgoss", "run", image_tag], cwd=image_path, stderr=subprocess.DEVNULL))
  File "/usr/lib/python3.6/subprocess.py", line 356, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.6/subprocess.py", line 423, in run
    with Popen(*popenargs, **kwargs) as process:
  File "/usr/lib/python3.6/subprocess.py", line 729, in __init__
    restore_signals, start_new_session)
  File "/usr/lib/python3.6/subprocess.py", line 1364, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'dgoss': 'dgoss'

文件存在且可执行。 python为什么会抛出异常？

Answer 1

原来 dgoss 是一个围绕 goss 的 bash 包装器，并且没有 bash 的 alpine docker 图像发布。

before_script:
  - apk add curl python3 bash