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ci(pi-gen): tonistiigi/binfmt --install arm64 (F flag, kernel-resident QEMU)

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apt's qemu-user-static + update-binfmts produces a registration that
pi-gen's nested Docker container still couldn't see. Switch to the
canonical tonistiigi/binfmt approach: privileged container that
installs QEMU statically with the F (fix-binary) flag, so the kernel
opens the qemu-aarch64-static binary at registration time and uses it
for all subsequent arm64 execs — independent of which container the
exec happens in.

Plus diagnostic: ls /proc/sys/fs/binfmt_misc + cat qemu-aarch64
detail, so next run's log surfaces whether registration actually
landed.
This commit is contained in:
Mitchell R 2026-05-20 00:31:42 +02:00
parent ab955e12da
commit 69e4bcb14a
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1 changed files with 10 additions and 10 deletions
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20
.github/workflows/build.yml vendored
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@ -169,18 +169,18 @@ jobs:
chmod +x deploy/pi-gen/stage-betterframe-client/01-install-kiosk/00-run-chroot.sh
# x86 runner can't natively execute the arm64 binaries pi-gen drops
# into the chroot. Install qemu-user-static + binfmt-support so the
# kernel routes arm64 ELFs through QEMU. docker/setup-qemu-action
# registers via a privileged container which pi-gen's own nested
# container doesn't pick up — apt path is what pi-gen documents.
# into the chroot. tonistiigi/binfmt registers QEMU with the F flag
# (kernel preloads the static binary), making it visible inside
# pi-gen's nested container kernel-namespace-share. This is what
# docker/setup-qemu-action wraps, called directly here so we control
# the flags + can sanity-check after.
- name: Register QEMU binfmt for arm64
run: |
sudo apt-get update
sudo apt-get install -y --no-install-recommends \
qemu-user-static binfmt-support
sudo update-binfmts --enable qemu-aarch64
# Sanity check — pi-gen looks for this exact file.
ls -la /proc/sys/fs/binfmt_misc/qemu-aarch64
docker run --rm --privileged tonistiigi/binfmt --install arm64
echo "--- binfmt_misc registrations ---"
ls -la /proc/sys/fs/binfmt_misc/ || true
echo "--- qemu-aarch64 details ---"
cat /proc/sys/fs/binfmt_misc/qemu-aarch64 || true
- name: Build Pi image (pi-gen)
uses: usimd/pi-gen-action@v1