Dockerfile

#
# Stage `dist` creates restic distribution.
#

# https://hub.docker.com/_/golang
FROM golang:1.22-alpine3.20 AS dist

ARG restic_ver=0.17.3
ARG build_rev=0


# Install build tools.
RUN apk add --update --no-cache \
        build-base curl git

# Prepare dirs for export.
RUN mkdir -p /out/usr/local/bin/ \
             /out/usr/share/licenses/restic/

# Download restic.
RUN curl -fL -o /tmp/restic.tar.gz \
         https://github.com/restic/restic/releases/download/v${restic_ver}/restic-${restic_ver}.tar.gz \
 && tar -xzf /tmp/restic.tar.gz -C /tmp

# Backup performance patch.
RUN curl -fL -o /tmp/archiver.patch \
         https://gist.githubusercontent.com/thiell/66de573550d161f1d7bae264ba4fdeb7/raw/e624e1451d4be637760b3f61d2245fc8ce68d558/archiver.go

# Build restic.
RUN cd /tmp/restic-* \
 && patch -p1 < /tmp/archiver.patch \
 && go run build.go \
 && cp restic /out/usr/local/bin/ \
 && cp LICENSE /out/usr/share/licenses/restic/



#
# Stage `runtime` creates final Docker image to use in runtime.
#

# https://hub.docker.com/_/alpine
FROM alpine:3.20 AS runtime


# Install restic runtime dependencies and upgrade existing packages.
RUN apk update \
 && apk upgrade \
 && apk add --no-cache \
        ca-certificates \
        fuse \
        openssh \
        rclone \
 && update-ca-certificates \
 && rm -rf /var/cache/apk/*

# Install restic.
COPY --from=dist /out/ /

# Prepare default restic env vars.
ENV RESTIC_REPOSITORY=/mnt/repo \
    RESTIC_PASSWORD=""


VOLUME /data

ENTRYPOINT ["/usr/local/bin/restic"]