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Brad Fitzpatrick
574ef3b2a8
The natlab-basic workflow builds the gokrazy natlab image in its own step so that the test's rebuild of it (vmtest always rebuilds, so the baked-in binaries match the source under test) is a build cache hit rather than a cold build inside go test's -timeout budget. That never worked: the Makefile ran whatever "go" was on $PATH, the runner's stock Go, while the go command puts its own $GOROOT/bin first on the test binary's $PATH, so the rebuild from inside "go test" used tailscale/go. GOCACHE entries embed the compiler's build ID, so the step warmed nothing. In practice the in-test rebuild took about 2.5 minutes of the 3 minute -timeout, leaving TestEasyEasy about 20 seconds for booting two VMs, logging in, and pinging. A passing run on main took 167s. Any hiccup in the remaining budget, such as the "tailscale up" hang fixed separately, ended in go test's timeout panic with no useful output. Make the natlab targets in gokrazy/Makefile use ../tool/go so the step and the test use the same toolchain and cache. Fix the same mistake in natlab-test.yml's cache warming step, whose comment documented the wrong belief about which toolchain the in-test builds use. Raise natlab-basic's -timeout to match natlab-test.yml so that a hang fails through vmtest's own bounded waits (which dump the node's logs) instead of through go test's timeout panic (which dumps nothing about the VMs). Updates #13038 Updates #deflake Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: Iaa6085ec5aa029373204baf75b169ff375c2b355
75 lines
3.3 KiB
YAML
75 lines
3.3 KiB
YAML
# Run a single natlab smoke test on every PR. The full natlab suite
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# is opt-in and lives in .github/workflows/natlab-test.yml.
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# See https://github.com/tailscale/tailscale/issues/13038
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name: "natlab-basic"
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concurrency:
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group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
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cancel-in-progress: true
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on:
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push:
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branches:
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- "main"
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- "release-branch/*"
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pull_request:
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# all PRs on all branches
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merge_group:
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branches:
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- "main"
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jobs:
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EasyEasy:
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runs-on: ubuntu-latest
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steps:
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- name: Check out code
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uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
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# Go caches, keyed the same as natlab-test.yml's. Only that workflow's
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# prepare job writes the build cache. A miss here just means a cold build.
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- name: Cache tsgo toolchain
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uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # zizmor: ignore[cache-poisoning] v5.0.4
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with:
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path: ~/.cache/tsgo
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key: natlab-tsgo-${{ runner.os }}-${{ hashFiles('go.toolchain.rev') }}
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- name: Cache Go modules
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uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # zizmor: ignore[cache-poisoning] v5.0.4
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with:
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path: ~/go/pkg/mod
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key: natlab-gomod-${{ runner.os }}-${{ hashFiles('go.mod', 'go.sum') }}
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- name: Restore Go build cache
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uses: actions/cache/restore@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
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with:
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path: ~/.cache/go-build
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key: natlab-gobuild-${{ runner.os }}-${{ hashFiles('go.sum') }}-${{ github.run_id }}
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restore-keys: |
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natlab-gobuild-${{ runner.os }}-${{ hashFiles('go.sum') }}-
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natlab-gobuild-${{ runner.os }}-
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- name: Enable KVM
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run: |
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echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
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sudo udevadm control --reload-rules
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sudo udevadm trigger --name-match=kvm
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- name: Install qemu
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run: |
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sudo rm -f /var/lib/man-db/auto-update
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sudo apt-get -y update
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sudo apt-get -y remove man-db
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sudo apt-get install -y qemu-system-x86 qemu-utils
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- name: Build VM image
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# The test always rebuilds this image itself (so the baked-in
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# binaries match the source under test), but we build it here
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# first so that rebuild is a build cache hit instead of a cold
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# build that eats the go test -timeout budget, and so a broken
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# image build fails earlier with a clearer error. The Makefile
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# uses ./tool/go, the same toolchain the test's rebuild uses;
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# a build with a different toolchain here would warm nothing.
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run: |
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make -C gokrazy natlab
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- name: Run natlab integration tests
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# With a warm build cache the test takes well under a minute.
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# The timeout matches natlab-test.yml and exceeds vmtest's own
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# 10 minute test context, so that a hung node fails through the
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# test's bounded waits, which dump the node's logs, rather than
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# through go test's timeout panic, which dumps nothing useful.
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run: |
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./tool/go test -v -run=^TestEasyEasy$ -timeout=15m -count=1 ./tstest/natlab/vmtest --run-vm-tests
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