Not able to mount file (e.g. wp-config.php)

[ailic]

#84 (comment) (by @pierreozoux)

@ailic you should open an other issue.
In your specific case, if wp-config.php is not created before starting, docker (in previous version, it is no longer the case) would create a folder, and not a file. (Now, with latest version, you'll just get an error).

The problem occurs when trying to mount the file, in this case wp-config.php. Just mounting folders works without problems.

Here's the content of docker-compose.yml file:

version: '2'
services:
 web:
 image: wordpress
 ports:
 - "80:80"
 volumes:
 - ./src/wordpress/wp-content:/var/www/html/wp-content
 - ./src/wordpress/wp-config.php:/var/www/html/wp-config.php
 environment:
 WORDPRESS_DB_NAME: db_name
 WORDPRESS_DB_HOST: db
 WORDPRESS_DB_PASSWORD: db_pass
 links:
 - db:mysql
 db:
 image: mysql
 ports:
 - "3306:3306"
 volumes:
 - mysql-data:/var/lib/mysql
 environment:
 MYSQL_ROOT_PASSWORD: db_pass
volumes:
 mysql-data:
 external: true

If wp-config.php file is previously created, command docker-compose up will fire the error:

WordPress not found in /var/www/html - copying now...
WARNING: /var/www/html is not empty - press Ctrl+C now if this is an error!
+ ls -A
wp-config.php
+ sleep 10
Complete! WordPress has been successfully copied to /var/www/html
sed: cannot rename ./sedgnRHlX: Device or resource busy

If not previously created (wp-config.php), error would be:

sed: couldn't edit wp-config.php: not a regular file

and folder with that name would be created.

Environment:

Docker version 1.10.3, build 20f81dd
docker-compose version 1.6.2, build 4d72027

[lvnilesh]

I ran into this exact problem while trying to mount the file wp-config.php

docker version
Client:
 Version: 1.12.1
 API version: 1.24
 Go version: go1.6.3
 Git commit: 23cf638
 Built: Thu Aug 18 05:33:38 2016
 OS/Arch: linux/amd64

Server:
 Version: 1.12.1
 API version: 1.24
 Go version: go1.6.3
 Git commit: 23cf638
 Built: Thu Aug 18 05:33:38 2016
 OS/Arch: linux/amd64


docker-compose version
docker-compose version 1.8.0, build 94f7016
docker-py version: 1.10.2
CPython version: 2.7.12
OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016

[yosifkit]

Mounting single files has always been problematic, since editing it on the host is not reflected in the container anyway (and apparently you can't edit them from the container at all). You should probably just mount the folder containing wp-config.php.

[maennchen]

If the wp-config.php file already exists, there is no need to run sed or any other commands on it. THe user decided to provide its own config file.

Just move the sed command and other editing commands into the if [ ! -e wp-config.php ] block.

Maybe add a message like if [ -e wp-config.php ]; then echo "Skipping Auto Config" fi.

[webarthur]

The trick:

wp:
image: wordpress:latest
ports:
- 80:80
volumes:
- ./wp-content:/var/www/html/wp-content
- ./wp-config.php:/usr/src/wordpress/wp-config-sample.php

When local wp-config.php changes you should delete /var/www/html/wp-config.php from container, docker will copy it again... but it works!