Serverless-python-requirements: Executable may have wrong permissions

[JulienMarliac]

Hi all,

I'm trying to run a chromium scrapper (with selenium) on python lambda using :

OS:                    win32
Node Version:          8.9.4
Serverless Version:    1.33.2
Python:                3.6
Selenium:              3.141.0

When I check the package with WSL (Windows Subsystem for Linux) the rights seems good :

-rwxrwxrwx 1 user user 7874704 janv.  1  1980 chromedriver
-rwxrwxrwx 1 user user 109319976 janv.  1  1980 headless-chromium

But when I try to call the lambda I get

Message: 'chromedriver' executable may have wrong permissions.

Any ideas ?

[bsamuel-ui]

You should have your script log the output of ls -al to see what permissions are actually set in lambda. Builds should break if the permissions aren't preserved. (See #233 and #166.)

You can also check the attributes directly using python -c 'import zipfile; print("\n".join(map(repr, zipfile.ZipFile(".serverless/your-project.zip").infolist()))'

Looking at this thread it looks like it's sensitive to where it's located and a bunch of other things, so the error message may be misleading. If it needs to be at /usr/local/bin, you're SOL as that's not writeable in lambda.

[JulienMarliac]

Ok i've figured out, bin files needs to be in /tmp in order to be excuted !

import os
import subprocess
import shutil
import time

BIN_DIR = "/tmp/bin"
CURR_BIN_DIR = os.getcwd() + "/bin"


def _init_bin(executable_name):
    start = time.clock()
    if not os.path.exists(BIN_DIR):
        print("Creating bin folder")
        os.makedirs(BIN_DIR)
    print("Copying binaries for " + executable_name + " in /tmp/bin")
    currfile = os.path.join(CURR_BIN_DIR, executable_name)
    newfile = os.path.join(BIN_DIR, executable_name)
    shutil.copy2(currfile, newfile)
    print("Giving new binaries permissions for lambda")
    os.chmod(newfile, 0o775)
    elapsed = time.clock() - start
    print(executable_name + " ready in " + str(elapsed) + "s.")


def handler(event, context):

    _init_bin("headless-chromium")
    _init_bin("chromedriver")

[CaseGuide]

Note to people who land here googling this error. @JulienMarliac's solution works so long as you then also load it from that location (duh). I posted full example code here: https://stackoverflow.com/questions/56082021/issue-running-selenium-on-aws-lambda/63122479#63122479