python subprocess Popen在本地和遠程系統上的行爲不同

我正在使用django並將構建發送到travis-ci，這對我的測試構建失敗。這是有問題的行是在這個函數...python subprocess Popen在本地和遠程系統上的行爲不同

from subprocess import Popen, PIPE 

def make_mp3(path, blob): 
    process = Popen(
     ['lame', '-', '--comp', '40', path], stdin=PIPE, stdout=PIPE, stderr=PIPE) 
    stdout_data = process.communicate(input=blob.read()) 
    return stdout_data

調用該函數的行是在這裏：

make_mp3(mp3_path, request.FILES['audio_file'])

我的本地系統上測試運行良好，並通過。我一直在使用這個函數一段時間，它的行爲和預期的一樣。但是，當我把它發送給特拉維斯-CI爲構建它給了我這個回溯...

====================================================================== 
ERROR: test_post_upload_audio_word (define.tests.ViewTests) 
Testing the audio upload function for word audio 
---------------------------------------------------------------------- 
Traceback (most recent call last): 
    File "/home/travis/build/deltaskelta/langalang/define/tests.py", line 827, in test_post_upload_audio_word 
    'audio_file': audio_file}) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/test/client.py", line 541, in post 
    secure=secure, **extra) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/test/client.py", line 343, in post 
    secure=secure, **extra) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/test/client.py", line 409, in generic 
    return self.request(**r) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/test/client.py", line 494, in request 
    six.reraise(*exc_info) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner 
    response = get_response(request) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/utils/decorators.py", line 67, in _wrapper 
    return bound_func(*args, **kwargs) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view 
    return view_func(request, *args, **kwargs) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/utils/decorators.py", line 63, in bound_func 
    return func.__get__(self, type(self))(*args2, **kwargs2) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/utils/decorators.py", line 67, in _wrapper 
    return bound_func(*args, **kwargs) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/contrib/auth/decorators.py", line 23, in _wrapped_view 
    return view_func(request, *args, **kwargs) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/utils/decorators.py", line 63, in bound_func 
    return func.__get__(self, type(self))(*args2, **kwargs2) 
    File "/home/travis/build/deltaskelta/langalang/define/views.py", line 21, in dispatch 
    return super(Define, self).dispatch(*args, **kwargs) 
    File "/home/travis/virtualenv/python2.7.12/lib/python2.7/site-packages/django/views/generic/base.py", line 88, in dispatch 
    return handler(request, *args, **kwargs) 
    File "/home/travis/build/deltaskelta/langalang/define/views.py", line 89, in post 
    return upload_audio(request, context) 
    File "/home/travis/build/deltaskelta/langalang/define/views_func.py", line 251, in upload_audio 
    make_mp3(mp3_path, request.FILES['audio_file']) 
    File "/home/travis/build/deltaskelta/langalang/define/views_func.py", line 25, in make_mp3 
    ['lame', '-', '--comp', '40', path], stdin=PIPE, stdout=PIPE, stderr=PIPE) 
    File "/opt/python/2.7.12/lib/python2.7/subprocess.py", line 711, in __init__ 
    errread, errwrite) 
    File "/opt/python/2.7.12/lib/python2.7/subprocess.py", line 1343, in _execute_child 
    raise child_exception 
OSError: [Errno 2] No such file or directory

我不明白爲什麼這會通過我的系統上測試和失敗的構建。輸入文件顯然存在，因爲request.FILES找到它。該目錄存在..我檢查。那麼它是什麼告訴我不存在？

來源

2016-09-07 deltaskelta

如果您在生產時手動執行它（如果可以的話）會怎麼樣？事情是，這個例外可以不參考路徑參數，但要命令你執行 – valignatev

你發佈這個權利，因爲我想通了。我忘了在編譯環境中安裝跛腳。你怎麼知道這也可能是問題？我花了幾個小時一次又一次地檢查路徑，因爲我認爲這就是它告訴我 – deltaskelta

我試圖在答案中解釋它。 – valignatev

失敗的原因：執行命令不能執行不存在的文件。在你的例子中它是lame。引用自doc section：

引發的最常見異常是OSError。例如，嘗試執行不存在的文件時會發生這種情況。應用程序應該爲OSError異常做準備。

您還可以在接近結尾時檢查subprocess.py中的_execute_child方法的源代碼。

來源

2016-09-07 08:02:48 valignatev

python subprocess Popen在本地和遠程系統上的行爲不同

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