python - docker: error with google-sheet-api minimal example -

i have flask app fetches data google sheet. when run flask app on local machine, it's creating credentials 0auth2 authentication , stores on local. after successful completion of flask local app, made same app inside docker container.

scenario 1
the container has credentials copied/added @ time of container creation. on case flask app working without issues

scenario 2
the container has no credentials file. so, has generate file calling get_credentials() function. @ point, web browser stucked/keep on waiting response server ( browser @ stage of loading )

scenario 2 problem. hope can me ..
i'm following documentation.
dockerfile

from python:2.7-slim workdir g_api add . /g_api run pip install -r requirements.txt expose 8000 

docker-compose.yml

version: "3" services:   web:     build:       context: .       dockerfile: dockerfile     command: "python g_api.py"     ports:       - "8000:8000"     networks:       - webnet     volumes:       - .:/g_api networks:   webnet: 

requirements.txt

flask==0.12.2 google-api-python-client==1.6.2 

g_api.py

from __future__ import print_function flask import flask import httplib2 import os  apiclient import discovery oauth2client import client oauth2client import tools oauth2client.file import storage  app = flask(__name__) try:     import argparse      flags = argparse.argumentparser(parents=[tools.argparser]).parse_args() except importerror:     flags = none  scopes = 'https://www.googleapis.com/auth/spreadsheets.readonly' client_secret_file = 'client_secret.json' application_name = 'google sheets api python quickstart'   def get_credentials():     """gets valid user credentials storage.      if nothing has been stored, or if stored credentials invalid,     oauth2 flow completed obtain new credentials.      returns:         credentials, obtained credential.     """      credential_dir = os.path.join(os.getcwd(), 'credentials')     if not os.path.exists(credential_dir):         os.makedirs(credential_dir)     credential_path = os.path.join(credential_dir,                                    'sheets.googleapis.com-python-quickstart.json')      store = storage(credential_path)     credentials = store.get()     if not credentials or credentials.invalid:         flow = client.flow_from_clientsecrets(client_secret_file, scopes)         flow.user_agent = application_name         if flags:             credentials = tools.run_flow(flow, store, flags)         else:  # needed compatibility python 2.6             credentials = tools.run(flow, store)         print('storing credentials ' + credential_path)     return credentials  @app.route('/') def main():     """shows basic usage of sheets api.      creates sheets api service object , prints names , majors of     students in sample spreadsheet:     https://docs.google.com/spreadsheets/d/1bximvs0xra5nfmdkvbdbzjgmuuqptlbs74ogve2upms/edit     """     credentials = get_credentials()     http = credentials.authorize(httplib2.http())     discoveryurl = ('https://sheets.googleapis.com/$discovery/rest?'                     'version=v4')     service = discovery.build('sheets', 'v4', http=http,                               discoveryserviceurl=discoveryurl)      spreadsheetid = '1bximvs0xra5nfmdkvbdbzjgmuuqptlbs74ogve2upms'     rangename = 'class data!a2:e'     result = service.spreadsheets().values().get(         spreadsheetid=spreadsheetid, range=rangename).execute()     values = result.get('values', [])      if not values:         return "not success"         # print('no data found.')     else:         print('name, major:')         row in values:             # print columns , e, correspond indices 0 , 4.             print('%s, %s' % (row[0], row[4]))         return "success"   if __name__ == '__main__':     app.run(host='0.0.0.0', port=int(8000), debug=true) 

directory_sructure

.g_api ├── client_secret.json ├── credentials ├── docker-compose.yml ├── dockerfile ├── g_api.py └── requirements.txt 

edit

the container logs ( docker logs cont_id )

warning: error loading config file:/home/jpg/.docker/config.json - stat /home/jpg/.docker/config.json: permission denied  * running on http://0.0.0.0:8000/ (press ctrl+c quit)  * restarting stat  * debugger active!  * debugger pin: 200-757-358 /usr/local/lib/python2.7/site-packages/oauth2client/_helpers.py:255: userwarning: cannot access /g_api/credentials/sheets.googleapis.com-python-quickstart.json: no such file or directory   warnings.warn(_missing_file_message.format(filename))  * running on http://0.0.0.0:8000/ (press ctrl+c quit)  * restarting stat  * debugger active!  * debugger pin: 200-757-358