Read credentials from a php file if provided

to simplify a cluster setting.

Related to femiwiki/femiwiki#230

Dockerfile

@@ -23,6 +23,9 @@ RUN apt-get update && apt-get -y install cron
 COPY crontab .
 RUN crontab crontab && rm crontab
 
+# Install php
+RUN apt-get update && apt-get install -y php-cli
+
 # Install python
 RUN apt-get update && apt-get install -y python3-pip
 
@@ -31,6 +34,6 @@ RUN python3 -m pip install --upgrade pip &&\
     python3 -m pip install awscli
 
 # Copy scripts
-COPY do-backup docker-cmd ./
+COPY do-backup docker-cmd /usr/local/bin/
 
-CMD ["/a/docker-cmd"]
+CMD ["/usr/local/bin/docker-cmd"]

README.md

@@ -1,41 +1,55 @@
-backupbot [![Docker Badge]][Docker Hub]
-========
-주기적으로 [MySQL]을 덤프하여 [AWS S3]에 업로드합니다.
+# backupbot [![Docker Badge]][docker hub]
+
+A Docker image for dumping [MySQL] that contains [MediaWiki] data and uploading to [AWS S3] periodically. This image is designed for [FemiWiki].
 
 ```bash
+# Configuring network is required
+
+# Passing username and password as environment variables
 docker run --detach \
   --name backupbot \
   --restart always \
   -e 'DB_USERNAME=xxxxxxxx' \
   -e 'DB_PASSWORD=xxxxxxxx' \
   femiwiki/backupbot
-# 추가적인 네트워크 설정이 필요합니다.
+
+# Alternatively, you can provide LocalSettings.php instead
+docker run --detach \
+  --name backupbot \
+  --restart always \
+  -v $PWD/LocalSettings.php:/a/LocalSettings.php \
+  femiwiki/backupbot
 ```
 
-백업 파일의 사용 방법
---------
+## Environment variables
 
-https://github.com/femiwiki/docker-mediawiki/blob/main/README.md 등의 설명에 따라 미디어위키를 실행한 후 [Restoring a wiki from backup](https://www.mediawiki.org/wiki/Manual:Restoring_a_wiki_from_backup) 메뉴얼을 따릅니다. 예를 들어 mysql 콘테이너에 백업 파일을 복사한 후 다음 커맨드를 실행합니다.
+- `DB_USERNAME`: The user name passed to access the database. If `/a/LocalSettings.php` is exist, this will be ignored.
+- `DB_PASSWORD`: The password passed to access the database. If `/a/LocalSettings.php` is exist, this will be ignored.
+
+## Restoring a wiki from backup
 
 ```sh
-mysql -uDB_USERNAME -pDB_PASSWORD < dump_of_wikidb.sql #DB_USERNAME과 DB_PASSWORD
+# Replace DB_USERNAME and DB_PASSWORD with actual values
+mysql -uDB_USERNAME -pDB_PASSWORD < dump_of_wikidb.sql
 ```
 
-이후 필요에 따라 [rebuildall.php](https://www.mediawiki.org/wiki/Manual:Rebuildall.php)와 같은 스크립트를 실행합니다.
-
+Run [rebuildall.php](https://www.mediawiki.org/wiki/Manual:Rebuildall.php) script.
+See [Restoring a wiki from backup](https://www.mediawiki.org/wiki/Manual:Restoring_a_wiki_from_backup) for details.
 
 &nbsp;
 
---------
+---
 
-The source code of *backupbot* is primarily distributed under the terms of
+The source code of _backupbot_ is primarily distributed under the terms of
 the [GNU Affero General Public License v3.0] or any later version. See
 [COPYRIGHT] for details.
 
-[Docker Badge]: https://badgen.net/badge/icon/docker?icon=docker&label
-[Docker Hub]: https://github.com/orgs/femiwiki/packages/container/backupbot
-[MySQL]: https://www.mysql.com/
-[AWS S3]: https://aws.amazon.com/s3/
-[페미위키]: https://femiwiki.com
-[GNU Affero General Public License v3.0]: LICENSE
-[COPYRIGHT]: COPYRIGHT
+[docker badge]: https://badgen.net/badge/icon/docker?icon=docker&label
+[docker hub]: https://github.com/orgs/femiwiki/packages/container/backupbot
+[mysql]: https://www.mysql.com/
+[mediawiki]: https://www.mediawiki.org/
+[femiwiki]: https://femiwiki.com
+[localsettings.php]: https://www.mediawiki.org/wiki/Manual:LocalSettings.php
+[aws s3]: https://aws.amazon.com/s3/
+[gnu affero general public license v3.0]: LICENSE
+[copyright]: COPYRIGHT

crontab

@@ -1 +1 @@
-0 6 * * * /a/do-backup >> /tmp/log 2>&1
+0 6 * * * /usr/local/bin/do-backup >> /tmp/log 2>&1

docker-cmd

@@ -1,7 +1,14 @@
 #!/bin/bash
 set -euo pipefail; IFS=$'\n\t'
 
-cat <<EOF >~/.my.cnf
+if [ -f /a/LocalSettings.php ]; then
+  DB_USERNAME="$(php -r 'require "/a/LocalSettings.php"; echo $wgDBuser;')"
+  DB_PASSWORD="$(php -r 'require "/a/LocalSettings.php"; echo $wgDBpassword;')"
+fi
+
+echo "Use $DB_USERNAME user"
+
+cat <<EOF >/root/.my.cnf
 [mysqldump]
 protocol=TCP
 user=$DB_USERNAME