From fb6c30cd4913f7785e024876b764fe1e27bd7717 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Ale=C5=A1=20Mr=C3=A1zek?= <ales.mrazek@nic.cz>
Date: Wed, 30 Oct 2024 11:47:15 +0100
Subject: [PATCH] scripts: created Makefile.docker

---
 scripts/Makefile.docker | 45 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 scripts/Makefile.docker

diff --git a/scripts/Makefile.docker b/scripts/Makefile.docker
new file mode 100644
index 000000000..f32386e60
--- /dev/null
+++ b/scripts/Makefile.docker
@@ -0,0 +1,45 @@
+# Based on https://netfuture.ch/2020/05/multi-arch-docker-image-easy/
+#
+# Example: make -f Makefile.docker docker-multiarch
+
+REGISTRY	= cznic
+BASETAG		= ${REGISTRY}/knot-resolver
+PLATFORMS	= linux/amd64,linux/arm/v7,linux/arm64/v8
+
+RELEASE		= $(shell git describe --abbrev=0 --exact-match)
+RELTAG		= $(shell [ -n "${RELEASE}" ] && echo "-t ${BASETAG}:${RELEASE}" || echo "")
+
+BUILDXDETECT	= ${HOME}/.docker/cli-plugins/docker-buildx
+QEMUDETECT	= /proc/sys/fs/binfmt_misc/qemu-m68k
+
+docker-multiarch: qemu buildx docker-multiarch-builder
+	docker login
+	docker buildx build --no-cache --builder docker-multiarch --pull --push \
+	                    --platform ${PLATFORMS} ${RELTAG} ..
+
+qemu: ${QEMUDETECT}
+${QEMUDETECT}:
+	docker pull multiarch/qemu-user-static
+	docker run --privileged multiarch/qemu-user-static --reset -p yes
+	docker ps -a | sed -n 's, *multiarch/qemu-user-static.*,,p' \
+	  | (xargs docker rm 2>&1 || \
+	    echo "Cannot remove docker container on ZFS; retry after next reboot") \
+	  | grep -v 'dataset is busy'
+
+buildx: ${BUILDXDETECT}
+${BUILDXDETECT}:
+	@echo
+# Output of `uname -m` is too different
+	@echo '*** `docker buildx` missing. Install binary for this machine architecture'
+	@echo '*** from `https://github.com/docker/buildx/releases/latest`'
+	@echo '*** to `~/.docker/cli-plugins/docker-buildx` and `chmod +x` it.'
+	@echo
+	@exit 1
+
+docker-multiarch-builder: qemu buildx
+	if ! docker buildx ls | grep -w docker-multiarch > /dev/null; then \
+		docker buildx create --name docker-multiarch && \
+		docker buildx inspect --builder docker-multiarch --bootstrap; \
+	fi
+
+.PHONY: qemu buildx docker-multiarch docker-multiarch-builder
\ No newline at end of file
-- 
2.47.2