Make base_ubuntu_warden_rosetta host-architecture agnostic so it can run in CI - #716
Make base_ubuntu_warden_rosetta host-architecture agnostic so it can run in CI#716mkocher wants to merge 1 commit into
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WalkthroughThe Rosetta stage now uses a host-architecture-agnostic package flow. It downloads and extracts arm64 packages outside the chroot, installs verified arm64 binaries and systemd components, and preserves amd64 binaries. The tar execution self-test runs only when the host can execute arm64 binaries. Specifications now verify Rosetta stage ordering and conditional tar validation. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@stemcell_builder/stages/base_ubuntu_warden_rosetta/apply.sh`:
- Around line 267-291: Separate arm64 execution detection from tar validation in
the probe logic around run_in_chroot: use an independent minimal arm64
executable such as ld-linux-aarch64.so.1 to set the capability marker, then
require /usr/bin/tar --version and the existing round-trip self-test to succeed
when execution is supported, failing rather than skipping if tar is
nonfunctional. Apply the same host-capability versus tar-health distinction in
the Rosetta behavior covered by rosetta_spec.rb.
Apply the same fix in `@bosh-stemcell/spec/stemcells/rosetta_spec.rb` around lines
89 - 92: The spec has the same ambiguity and can skip on runtime failures
instead of reporting a broken arm64 tar.
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bosh-stemcell/spec/bosh/stemcell/stage_collection_spec.rbbosh-stemcell/spec/stemcells/rosetta_spec.rbstemcell_builder/stages/base_ubuntu_warden_rosetta/apply.sh
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The PR looks great overall! The approach to extract debs outside the chroot and statically verify the arm64 binaries is clever and robust.
I agree with the feedback from coderabbitai: the capability probe and tar health check should be separated. If tar itself is broken (e.g., missing shared libraries or loader), /usr/bin/tar --version will fail, but the current script will interpret that failure as 'the host cannot execute arm64 binaries' and skip the test rather than failing the build.
To fix this, you can use an independent minimal arm64 executable like /lib/ld-linux-aarch64.so.1 --help to set the capability marker. Then, require /usr/bin/tar --version and the existing round-trip self-test to succeed when execution is supported.
In stemcell_builder/stages/base_ubuntu_warden_rosetta/apply.sh:
probe_marker=/tmp/arm64-exec-probe
run_in_chroot $chroot "
rm -f $probe_marker
/lib/ld-linux-aarch64.so.1 --help >/dev/null 2>&1 && : > $probe_marker
true
"
if [ -f "$chroot$probe_marker" ]; then
run_in_chroot $chroot "
set -e
/usr/bin/tar --version >/dev/null
rm -rf /tmp/tar-selftest
# ... rest of the testAnd similarly in bosh-stemcell/spec/stemcells/rosetta_spec.rb:
it "extracts an archive it just created" do
if command("/lib/ld-linux-aarch64.so.1 --help").exit_status != 0
skip("this build host cannot execute arm64 binaries; the tar " \
"round-trip is the only check skipped, all static assertions ran")
end
expect(subject.exit_status).to eq(0)
endOther than that, the changes are well-structured and the comments are excellent.
The stage executed arm64 binaries while doing its work — the tar self-test, and `dpkg -x` in the chroot, which shells out to the just-swapped GNU tar — so it only ran on an Apple Silicon host. Download all the arm64 debs first, extract them from outside the chroot with the builder image's tar, then swap and statically verify (e_machine == 183) every replacement, including tar and the systemd daemons. The tar round-trip now runs only behind an exec probe and skips loudly otherwise, in the stage and in rosetta_spec.rb, so the stage can build on an x86-64 CI worker. Also cover stage_collection's rosetta insertion, which had no unit test.
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Agreed, that is better. I've pushed your suggested fix. |
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Human Summary
Make building the rosetta stemcell possible in CI by not relying on any of the arm binaries. Verified with a build and test deployment with the new stemcell.
AI Summary
The stage executed arm64 binaries while doing its work — the tar self-test, and
dpkg -xin the chroot, which shells out to the just-swapped GNU tar — so it only ran on an Apple Silicon host. Download all the arm64 debs first, extract them from outside the chroot with the builder image's tar, then swap and statically verify (e_machine == 183) every replacement, including tar and the systemd daemons. The tar round-trip now runs only behind an exec probe and skips loudly otherwise, in the stage and in rosetta_spec.rb, so the stage can build on an x86-64 CI worker.Also cover stage_collection's rosetta insertion, which had no unit test.