Simplified Dockerfile

- using alpine's dumb-init to remove builder
- simplifying arch management
- extracting to final location

docker/Dockerfile

@@ -1,46 +1,18 @@
-# dumb-init to use as entrypoint so it can forward signals to our CMD
-FROM debian:bullseye-slim as builder
-RUN apt-get update -y \
-    && apt-get install -y --no-install-recommends \
-    build-essential ca-certificates musl-tools wget unzip make \
-    && apt-get clean \
-    && rm -rf /var/lib/apt/lists/*
-# compile dumb-init
-RUN wget -nv https://github.com/Yelp/dumb-init/archive/refs/tags/v1.2.5.zip && \
-    unzip v1.2.5.zip && cd dumb-init-1.2.5 && CC=musl-gcc make
-
-# declare build option ARCH if not using buildx
-ARG ARCH=
-# declare version to build image for
-ARG VERSION=
-
-# alpine is a multi-arch image
-FROM alpine:3
+FROM alpine:3.16
 LABEL org.opencontainers.image.source https://github.com/openzim/kiwix-tools
-
-# TARGETARCH is injected by buildx
-ARG TARGETARCH
 ARG VERSION
-ARG ARCH
 
-# copy built dumb-init
-COPY --from=builder /dumb-init-1.2.5/dumb-init /usr/bin/dumb-init
-
-# find and store arch in image, using (in this order):
-# $TARGETARCH || --build-arg ARCH (not using buildx) || amd64
-RUN echo "amd64" > /etc/docker_arch && \
-    if [ ! -z "$ARCH" ] ; then echo "$ARCH" > /etc/docker_arch ; fi && \
-    if [ ! -z "$TARGETARCH" ] ; then echo "$TARGETARCH" > /etc/docker_arch ; fi
-
-# decide which kiwix arch to download later (`armhf` for all arm* and x86_64 otherwise)
-RUN if [ $(cut -c 1-3 /etc/docker_arch) = "arm" ] ; then echo "armhf" > /etc/kiwix_arch ; else echo "x86_64" > /etc/kiwix_arch ; fi
-
-# Install kiwix-tools
-RUN url="http://mirror.download.kiwix.org/release/kiwix-tools/kiwix-tools_linux-$(cat /etc/kiwix_arch)-$VERSION.tar.gz" && \
+RUN apk --no-cache add dumb-init curl && \
+    ARCH=$(cat /etc/apk/arch) && \
+    if [ "$ARCH" = "x86" ]; then ARCH="i586"; \
+    elif [ "$ARCH" = "aarch64" ]; then ARCH="armhf"; \
+    elif [ "$ARCH" = "armv7" ]; then ARCH="armhf"; fi && \
+    # download requested kiwix-tools version
+    url="http://mirror.download.kiwix.org/release/kiwix-tools/kiwix-tools_linux-$ARCH-$VERSION.tar.gz" && \
     echo "URL: $url" && \
-    wget -q -O - $url | tar -xz && \
-    mv kiwix-tools*/kiwix-* /usr/local/bin && \
-    rm -r kiwix-tools*
+    curl -k -L $url | tar -xz -C /usr/local/bin/ --strip-components 1 && \
+    # only needed in dockerfile
+    apk del curl
 
 # expose kiwix-serve default port
 EXPOSE 80