build dockerize and fix restore.sh db name for issue #38

Dockerfile

@@ -1,15 +1,21 @@
+FROM golang:1.15.8-alpine3.12 AS binary
+RUN apk -U add openssl git
+
+ARG DOCKERIZE_VERSION=v0.6.1
+WORKDIR /go/src/github.com/jwilder
+RUN git clone https://github.com/jwilder/dockerize.git && cd dockerize && git checkout ${DOCKERIZE_VERSION}
+
+WORKDIR /go/src/github.com/jwilder/dockerize
+RUN go get github.com/robfig/glock
+RUN glock sync -n < GLOCKFILE
+RUN go install
+
 FROM alpine:3.12
 LABEL maintainer "Fco. Javier Delgado del Hoyo <frandelhoyo@gmail.com>"
 
 RUN apk add --update tzdata bash mysql-client gzip openssl mariadb-connector-c && rm -rf /var/cache/apk/*
 
-ARG OS=alpine-linux
-ARG ARCH=amd64
-ARG DOCKERIZE_VERSION=v0.6.1
-
-RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSION/dockerize-$OS-$ARCH-$DOCKERIZE_VERSION.tar.gz \
-    && tar -C /usr/local/bin -xzvf dockerize-$OS-$ARCH-$DOCKERIZE_VERSION.tar.gz \
-    && rm dockerize-$OS-$ARCH-$DOCKERIZE_VERSION.tar.gz
+COPY --from=binary /go/bin/dockerize /usr/local/bin
 
 ENV CRON_TIME="0 3 * * sun" \
     MYSQL_HOST="mysql" \

README.md

@@ -21,7 +21,7 @@ docker container run -d \
 - `MYSQL_PORT`: The port number of your mysql database.
 - `MYSQL_USER`: The username of your mysql database.
 - `MYSQL_PASS`: The password of your mysql database.
-- `MYSQL_DB`: The database name to dump. Default: `--all-databases`.
+- `MYSQL_DATABASE`: The database name to dump. Default: `--all-databases`.
 - `MYSQLDUMP_OPTS`: Command line arguments to pass to mysqldump. Example: `--single-transaction`.
 - `CRON_TIME`: The interval of cron job to run mysqldump. `0 3 * * sun` by default, which is every Sunday at 03:00. It uses UTC timezone.
 - `MAX_BACKUPS`: The number of backups to keep. When reaching the limit, the old backup will be discarded. No limit by default.
@@ -77,11 +77,22 @@ volumes:
 See the list of backups in your running docker container, just write in your favorite terminal:
 
 ```bash
-docker container exec backup ls /backup
+docker container exec <your_mysql_backuo_container_name> ls /backup
 ```
 
-To restore a database from a certain backup, simply run:
+To restore a database from a certain backup you have to specify the database name in the variable MYSQL_DATABASE:
 
-```bash
-docker container exec backup /restore.sh /backup/201708060500.my_db.sql.gz
+```YAML
+mysql-cron-backup:
+    image: fradelg/mysql-cron-backup
+    command: "/restore.sh /backup/201708060500.${DATABASE_NAME}.sql.gz"
+    depends_on:
+      - mariadb
+    volumes:
+      - ${VOLUME_PATH}/backup:/backup
+    environment:
+      - MYSQL_HOST=my_mariadb
+      - MYSQL_USER=root
+      - MYSQL_PASS=${MARIADB_ROOT_PASSWORD}
+      - MYSQL_DATABASE=${DATABASE_NAME}
 ```

restore.sh

@@ -9,7 +9,8 @@ fi
 
 echo "=> Restore database from $1"
 set -o pipefail
-if gunzip --stdout "$1" | mysql -h "$MYSQL_HOST" -P "$MYSQL_PORT" -u "$MYSQL_USER" -p"$MYSQL_PASS"
+DB_NAME=${MYSQL_DATABASE:-${MYSQL_DB}}
+if gunzip --stdout "$1" | mysql -h "$MYSQL_HOST" -P "$MYSQL_PORT" -u "$MYSQL_USER" -p"$MYSQL_PASS" "$DB_NAME"
 then
     echo "=> Restore succeeded"
 else