init

.github/workflows/build.yml

@@ -0,0 +1,16 @@
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: |
+          podman build --squash-all -t "ghcr.io/${{ github.repository }}" .
+          podman login -u token -p "${{ github.token }}" ghcr.io
+          podman push "ghcr.io/${{ github.repository }}"
+  test:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - run: sudo podman run --privileged "ghcr.io/${{ github.repository }}"
+      - run: podman run arm64v8/debian true

Containerfile

@@ -0,0 +1,11 @@
+FROM debian:testing AS build
+RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends build-essential ca-certificates git libglib2.0-dev ninja-build pkg-config python3 python3-venv
+RUN git clone --depth 1 https://gitlab.com/qemu-project/qemu.git
+RUN cd qemu && mkdir build && cd build && ../configure --target-list=aarch64-linux-user --static --disable-pie && make -j $(nproc) && cp qemu-aarch64 /aarch64-binfmt-P
+COPY register.c register.c
+RUN gcc -Wall -Wextra -Werror -static -o /register-aarch64-binfmt-P register.c
+
+FROM scratch
+COPY --from=build /aarch64-binfmt-P /aarch64-binfmt-P
+COPY --from=build /register-aarch64-binfmt-P /register-aarch64-binfmt-P
+CMD [ "/register-aarch64-binfmt-P" ]

include

@@ -0,0 +1,4 @@
+usr/bin/dd
+usr/bin/qemu-aarch64-static
+usr/lib/binfmt.d/qemu-aarch64.conf
+usr/libexec/qemu-binfmt/aarch64-binfmt-P

register.c

@@ -0,0 +1,26 @@
+#include <fcntl.h>
+#include <unistd.h>
+#include <err.h>
+#include <stddef.h>
+
+#include <sys/mount.h>
+#include <sys/stat.h>
+
+int main()
+{
+	int fd;
+
+	if (mkdir("/binfmt_misc", 0700) == -1) err(1, "mkdir /binfmt_misc");
+	if (mount("", "/binfmt_misc", "binfmt_misc", 0, 0) == -1) err(1, "mount binfmt_misc");
+
+	if ((fd = open("/binfmt_misc/register", O_WRONLY)) == -1) err(1, "open /binfmt_misc/register");
+	char str[] = ":qemu-aarch64:M::\\x7f\\x45\\x4c\\x46\\x02\\x01\\x01\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x02\\x00\\xb7\\x00:\\xff\\xff\\xff\\xff\\xff\\xff\\xff\\x00\\xff\\xff\\xff\\xff\\xff\\xff\\xff\\xff\\xfe\\xff\\xff\\xff:/aarch64-binfmt-P:POCF";
+	size_t len = sizeof(str) - 1;
+	if (write(fd, str, len) != (ssize_t) len) err(1, "write /binfmt_misc/register");
+
+	close(fd);
+
+	umount("/binfmt_misc");
+	rmdir("/binfmt_misc");
+	return 0;
+}