From 4c3e470117ab195e7523ae3918a4da1a5f957f59 Mon Sep 17 00:00:00 2001
From: Eugene Blikh <bigbes@gmail.com>
Date: Tue, 26 May 2026 08:29:51 +0300
Subject: [PATCH] test.yml: use published cacher binary instead of building
 from source

Walking back e1b71b2. Building cacher from source dropped the
go-tarball caching (chicken-and-egg). Bootstrapping from the published
v0.1.0 binary instead lets all three caches (go tarball, gomod, garage
image) use cacher.

Cost: cache_garage_image stays on the if/else cacher docker
{exists,download,upload} pattern instead of the single `cacher docker
download --pull` introduced on master, because v0.1.0 doesn't have
--pull yet. Comment notes the switch as a follow-up after the next
release.
---
 .builds/test.yml | 53 ++++++++++++++++++++++++++++--------------------
 1 file changed, 31 insertions(+), 22 deletions(-)

diff --git a/.builds/test.yml b/.builds/test.yml
index 19ff2ce81c1d30ce1d94c8da5c9e7c27b35c040c..72971a819fa035e59548bd2be230b6cde32b9254 100644
--- a/.builds/test.yml
+++ b/.builds/test.yml
@@ -3,18 +3,17 @@
 # install + module cache are shared and a unit-test failure
 # short-circuits before paying the ~150 MB Garage image pull.
 #
-# Order: install_go → install_cacher (built from source) → cacher_init
-#        → cache_gomod → test → docker_start → cache_garage_image →
-#        test_e2e.
+# Order: install_cacher → cacher_init → install_go → cache_gomod →
+#        test → docker_start → cache_garage_image → test_e2e.
 #
-# Dogfoods cacher (built fresh from source — this manifest is the
-# regression test for the binary it produces) to cache:
+# Dogfoods the published cacher binary (from pages.sr.ht) to cache:
+#   * The Go tarball, via `cacher download --url` fallback.
 #   * ~/go/pkg/mod, keyed on sha256(go.sum) — biggest win, the docker
-#     SDK transitives are heavy.
-#   * The Garage docker image, via `cacher docker download --pull`
-#     which on miss falls back to `docker pull` and seeds S3.
-# Go tarball itself isn't cached: cacher has to be built first, which
-# needs Go, so chicken-and-egg. ~50MB curl is acceptable.
+#     SDK transitives pulled in by testcontainers are heavy.
+#   * The Garage docker image, via `cacher docker {exists,download,
+#     upload}`. Switch to `cacher docker download --pull` after the
+#     next release; the single-command form lives on master but
+#     isn't in v0.1.0.
 image: ubuntu/noble
 packages:
   - curl
@@ -28,6 +27,8 @@ sources:
 environment:
   GO_VERSION: "1.26.3"
   PATH: /home/build/.local/go/bin:/home/build/.local/bin:/usr/local/bin:/usr/bin:/bin
+  PAGES_DOMAIN: bigbes.pages.srht.bigb.es
+  PAGES_SUBPATH: /ci-cacher
   # Keep in sync with internal/testutil/garage/container.go const Image.
   GARAGE_IMAGE: "dxflrs/garage:v2.3.0"
   # No Ryuk reaper — the VM is torn down at job end, so the reaper
@@ -40,19 +41,11 @@ submitter:
       - refs/heads/master
       - "refs/tags/*"
 tasks:
-  - install_go: |
-      GO_TARBALL="go${GO_VERSION}.linux-amd64.tar.gz"
-      mkdir -p ~/.local
-      curl -sSL "https://go.dev/dl/$GO_TARBALL" -o "/tmp/$GO_TARBALL"
-      tar -xz -C ~/.local -f "/tmp/$GO_TARBALL"
-      rm "/tmp/$GO_TARBALL"
-      go version
   - install_cacher: |
-      # Build from source so we exercise the binary this PR/branch
-      # actually produces — not the previously-published release.
       mkdir -p ~/.local/bin
-      cd ci-cacher
-      go build -o ~/.local/bin/cacher .
+      curl -sSL "https://${PAGES_DOMAIN}${PAGES_SUBPATH}/cacher-linux-amd64" \
+        -o ~/.local/bin/cacher
+      chmod +x ~/.local/bin/cacher
       cacher version
   - cacher_init: |
       cacher init \
@@ -62,6 +55,14 @@ tasks:
         --prefix      ci-cacher/deps \
         --key-file    ~/.s3-cache-key-id \
         --secret-file ~/.s3-cache-key-secret
+  - install_go: |
+      GO_TARBALL="go${GO_VERSION}.linux-amd64.tar.gz"
+      mkdir -p ~/.local
+      cacher download "golang/${GO_TARBALL}" "/tmp/${GO_TARBALL}" \
+        --url "https://go.dev/dl/${GO_TARBALL}"
+      tar -xz -C ~/.local -f "/tmp/${GO_TARBALL}"
+      rm "/tmp/${GO_TARBALL}"
+      go version
   - cache_gomod: |
       # Cache ~/go/pkg/mod keyed by sha256(go.sum). A go.sum change
       # invalidates automatically; otherwise both `go test` and the e2e
@@ -89,8 +90,16 @@ tasks:
   - cache_garage_image: |
       # Key derived from the image ref so a version bump invalidates
       # the cache automatically: dxflrs/garage:v2.3.0 → dxflrs-garage-v2.3.0
+      # stderr swallowed on `exists` because v0.1.0 still dumps the
+      # cobra Usage block on a miss (SilenceUsage lands in the next
+      # release).
       KEY="docker/$(echo "$GARAGE_IMAGE" | tr '/:' '-').tar.zst"
-      cacher docker download "$KEY" "$GARAGE_IMAGE" --pull
+      if cacher docker exists "$KEY" >/dev/null 2>&1; then
+        cacher docker download "$KEY" "$GARAGE_IMAGE"
+      else
+        docker pull "$GARAGE_IMAGE"
+        cacher docker upload "$KEY" "$GARAGE_IMAGE"
+      fi
       docker images "$GARAGE_IMAGE"
   - test_e2e: |
       cd ci-cacher