Python子进程check_output FileNotFoundError：[Errno 2]没有这样的文件或目录

Question

I wrote a little python script to build and test my docker images of that project. The script runs well locally, but fails remotely during check_output .

build.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

Output

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'

The file is present and executable. Why does python throw the exception?

Answer 1

Turns out dgoss is a bash wrapper around goss and alpine docker images ship without bash.

before_script:
  - apk add curl python3 bash