build mc from source, support arm/v7

.circleci/config.yml

@@ -48,7 +48,7 @@ jobs:
             docker context create docker-volume-backup
             docker buildx create docker-volume-backup --name docker-volume-backup --use
             docker buildx inspect --bootstrap
-            docker buildx build --platform linux/arm64,linux/amd64 \
+            docker buildx build --platform linux/amd64,linux/arm64,linux/arm/v7 \
               -t offen/docker-volume-backup:$CIRCLE_TAG \
               -t offen/docker-volume-backup:latest \
               . --push

Dockerfile

@@ -1,5 +1,9 @@
 # Copyright 2021 - Offen Authors <hioffen@posteo.de>
-# SPDX-License-Identifier: MIT
+# SPDX-License-Identifier: MPL-2.0
+
+FROM golang:1.16-alpine as builder
+ARG MC_VERSION=RELEASE.2021-06-13T17-48-22Z
+RUN go install github.com/minio/mc@$MC_VERSION
 
 FROM alpine:3.14
 
@@ -9,10 +13,8 @@ RUN apk add --update ca-certificates docker openrc gnupg
 RUN update-ca-certificates
 RUN rc-update add docker boot
 
-ARG TARGETARCH=amd64
-RUN wget https://dl.min.io/client/mc/release/linux-$TARGETARCH/mc && \
-  chmod +x mc && \
-  mv mc /usr/bin/mc
+COPY --from=builder /go/bin/mc /usr/bin/mc
+RUN mc --version
 
 COPY src/backup.sh src/entrypoint.sh /root/
 RUN chmod +x backup.sh && mv backup.sh /usr/bin/backup \

README.md

@@ -114,4 +114,4 @@ This image is heavily inspired by the `futurice/docker-volume-backup`. We decide
 - This image makes use of the MinIO client `mc` instead of the full blown AWS CLI for uploading backups.
 - The original image proposed to handle backup rotation through AWS S3 lifecycle policies. This image adds the option to rotate old backups through the same script so this functionality can also be offered for non-AWS storage backends like MinIO.
 - InfluxDB specific functionality was removed.
-- `arm64` Architecture is supported.
+- `arm64` and `arm/v7` architectures are supported.