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ci: install qemu-user, not the virtual qemu-user-static (Ubuntu 26.04) #148

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Merged
tannevaled merged 1 commit into from
Oct 25, 2026
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ci: install qemu-user, not the virtual qemu-user-static (Ubuntu 26.04) #148

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33 changes: 31 additions & 2 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -270,9 +270,38 @@ jobs:
- uses: actions/setup-go@v7
with:
go-version: 1.27.2
- run: sudo apt-get update && sudo apt-get install -y qemu-user-static
# ⛔ `qemu-user-static` is a VIRTUAL package on Ubuntu 26.04, which
# `ubuntu-latest` became on 2026-10-19, and apt refuses to choose between its
# two providers:
#
# E: Package 'qemu-user-static' has no installation candidate
#
# ⚠ Installing a provider is NOT the fix: `qemu-user-binfmt` registers binfmt
# handlers, it does not ship the `qemu-<arch>-static` binaries this lane
# invokes. `qemu-user` ships the dynamic `qemu-<arch>`, which is all that
# `go test -exec` needs, so both are installed and BOTH NAMES are accepted
# below. go-tex/engine#645 has the full account.
- name: install qemu user-mode emulators
timeout-minutes: 10
run: sudo apt-get update && sudo apt-get install -y qemu-user qemu-user-binfmt
- name: Test under qemu (${{ matrix.goarch }})
run: CGO_ENABLED=0 GOARCH=${{ matrix.goarch }} go test -exec=${{ matrix.qemu }} ./...
run: |
base="${{ matrix.qemu }}"
q=""
for cand in "$base" "${base%-static}"; do
command -v "$cand" >/dev/null 2>&1 && q="$cand" && break
done
# ⛔ A missing emulator FAILS this lane. A lane that reports success for
# an architecture it never ran is the one outcome this matrix exists to
# rule out.
if [ -z "$q" ]; then
echo "::error::no qemu user emulator for ${{ matrix.goarch }} (looked for $base and ${base%-static})"
exit 1
fi
# Printed on purpose: without it, "ran under emulation" and "skipped" are
# indistinguishable from a green tick.
echo "running ${{ matrix.goarch }} under $q"
CGO_ENABLED=0 GOARCH=${{ matrix.goarch }} go test -exec="$q" ./...

# Live X11 proof: open a real window under Xvfb, present a known test
# pattern, capture it and assert sampled pixels; synthesise a key + click
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