The test stage's image no longer holds Go's build cache or its module cache. go mod download now runs in the same RUN as go test, and go clean -cache -modcache runs at its end once the tests pass. COPY go.mod go.sum ./ went too, because COPY . . brings both files.
Deviation from the brief.#256 asked for go clean -cache alone. I measured that first. The go test layer fell from 107 MB to 9 kB, but the export and unpack only went from 20.6 to 19.3 seconds. The cost is the go mod download layer, about 314 MB. I took the definition of done as deciding this. The change stays in the test stage. script/test, the flags of go test and the tests are as they were.
For the owner. The stage now differs from the canonical Dockerfile in REPO_POLICIES.md, which keeps a separate download layer. That file is a shared copy, so I did not edit it. If the separate layer should stay, the fallback is go clean -cache alone, and the export stays at about 19 seconds.
Time. The export and unpack now take 0.2 seconds. make test took 62 seconds in a timed run on the busy host, against 83 on unmodified next the same hour. What is left:
About 40 seconds downloading modules and compiling under -race.
About 14 seconds running the tests.
About 7 seconds in the COPY and mkdir steps, which took under a second in another run.
Model: opus-5-5
The `test` stage's image no longer holds Go's build cache or its module cache. `go mod download` now runs in the same `RUN` as `go test`, and `go clean -cache -modcache` runs at its end once the tests pass. `COPY go.mod go.sum ./` went too, because `COPY . .` brings both files.
**Deviation from the brief.** https://git.eeqj.de/sneak/neoirc/issues/256 asked for `go clean -cache` alone. I measured that first. The `go test` layer fell from 107 MB to 9 kB, but the export and unpack only went from 20.6 to 19.3 seconds. The cost is the `go mod download` layer, about 314 MB. I took the definition of done as deciding this. The change stays in the `test` stage. `script/test`, the flags of `go test` and the tests are as they were.
**For the owner.** The stage now differs from the canonical `Dockerfile` in `REPO_POLICIES.md`, which keeps a separate download layer. That file is a shared copy, so I did not edit it. If the separate layer should stay, the fallback is `go clean -cache` alone, and the export stays at about 19 seconds.
**Time.** The export and unpack now take 0.2 seconds. `make test` took 62 seconds in a timed run on the busy host, against 83 on unmodified `next` the same hour. What is left:
- About 40 seconds downloading modules and compiling under `-race`.
- About 14 seconds running the tests.
- About 7 seconds in the `COPY` and `mkdir` steps, which took under a second in another run.
Model: opus-5-5
The test stage ran go mod download in its own layer, and go test left
Go's build cache in another. Exporting them took about 20 seconds of
every make test, and nothing reads either one afterwards.
Removing the build cache alone saved almost nothing, because the module
cache is the larger layer. So the download now runs in the same RUN as
go test, and go clean removes both caches once the tests pass. A failing
run still reruns with -v and exits 1.
Model: opus-5-5
PASS: this keeps Go's build and module caches out of the test stage's image as #256 asks, and nothing in it needs changing.
Model: opus-5-5
PASS: this keeps Go's build and module caches out of the `test` stage's image as https://git.eeqj.de/sneak/neoirc/issues/256 asks, and nothing in it needs changing.
Model: opus-5-5
clawbot
merged commit bc7ef8240b into next2026-11-03 12:20:49 +01:00
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The
teststage's image no longer holds Go's build cache or its module cache.go mod downloadnow runs in the sameRUNasgo test, andgo clean -cache -modcacheruns at its end once the tests pass.COPY go.mod go.sum ./went too, becauseCOPY . .brings both files.Deviation from the brief. #256 asked for
go clean -cachealone. I measured that first. Thego testlayer fell from 107 MB to 9 kB, but the export and unpack only went from 20.6 to 19.3 seconds. The cost is thego mod downloadlayer, about 314 MB. I took the definition of done as deciding this. The change stays in theteststage.script/test, the flags ofgo testand the tests are as they were.For the owner. The stage now differs from the canonical
DockerfileinREPO_POLICIES.md, which keeps a separate download layer. That file is a shared copy, so I did not edit it. If the separate layer should stay, the fallback isgo clean -cachealone, and the export stays at about 19 seconds.Time. The export and unpack now take 0.2 seconds.
make testtook 62 seconds in a timed run on the busy host, against 83 on unmodifiednextthe same hour. What is left:-race.COPYandmkdirsteps, which took under a second in another run.Model: opus-5-5
PASS: this keeps Go's build and module caches out of the
teststage's image as #256 asks, and nothing in it needs changing.Model: opus-5-5