Cannot run Python Subprocess calls using Jenkins

Question

The question has been asked elsewhere, but I do not see any solutions for this...

I have a Python script that contains subprocess calls of the form:

source_density = subprocess.check_output(["adb", device_dhm1, "-P8080", "-s", source, "shell", "wm density | head -2 | tail -1"])

When running this script through cmd, everything runs fine. However now I am trying to run it through Jenkins and I am getting the following error output:

======================================================================
ERROR: test_sanity (__main__.ABC)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/user123/.jenkins/workspace/Test/Jenkins-Source-Sanity.py", line 145, in test_sanity
    source_density = subprocess.check_output(["adb", device_dhm1, "-P8080", "-s", source, "shell", "wm density | head -2 | tail -1"])
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 216, in check_output
    process = Popen(stdout=PIPE, *popenargs, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 394, in __init__
    errread, errwrite)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1047, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

The error message suggests your program cannot locate the executable file adb. You can check the PATH environment variable. — gdlmx
– gdlmx, Commented Jan 10, 2020 at 18:09
but I am wondering why I don't see this when running via terminal? — cjg123
– cjg123, Commented Jan 10, 2020 at 18:11
Looks like it cannot find adb command in PATH, maybe you can try giving full path like /usr/bin/adb — Rishabh Arya
– Rishabh Arya, Commented Jan 10, 2020 at 18:12
@RishabhArya Thank you! giving the full path to adb worked perfectly! — cjg123
– cjg123, Commented Jan 10, 2020 at 18:17

gdlmx · Accepted Answer · 2020-01-10 18:16:07Z

1

Per default, check_output treats the first argument as a single executable instead of a shell command (cmd command). So you have to set the flag shell=True explicitly.

source_density = subprocess.check_output(["adb", device_dhm1, "-P8080", "-s", source, "shell", "wm density | head -2 | tail -1"], shell=True)

Please read the doc here.

answered Jan 10, 2020 at 18:16

gdlmx

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