DockerUbuntu plugin capture: synthetic shop fixture

Captured 2026-10-17 with the packaged DockerUbuntu plugin (darwin-arm64, commit 1ace25e)
against a local Docker Engine. The shop app below is a synthetic fixture written for this page,
not a customer application. Each run used a fresh container built from the same pinned
Ubuntu 24.04 base image, with no network. Timings are omitted. The private binding also
selected the local Docker Engine socket; that path is omitted. Setup commands also passed a
fixture cleanup label, omitted below, and the build context is shown relative to the fixture.
The plugin was driven directly through the pinned Reflow plugin host (bind, invoke, compare,
render), not by a `reflow apply` run. Invocations are written in flow syntax for readability;
the checkpoint names label them here and were not stored as Reflow checkpoints.

== Run: main ==

# Test setup (your environment, not run by the plugin)
$ docker build --quiet --pull=false --network=none --tag shop-test:main ./main
sha256:babae3a5b3ed83249994656284daa20d7c7c1ddf78c00cd580bfe5eb93962246
$ docker run --detach --pull=never --network=none --name shop-test-main shop-test:main
3c643e2680c5862c4ceeeb81cfa11b862d276abad4e416b54d457557047c92c5

# DockerUbuntu binding
{"container":"shop-test-main","cwd":"/workspace"}

# container.bash command="./bin/test" checkpoint="tests"
status: succeeded   exitCode: 0   truncated: false
--- stdout.txt (153 B, sha256 dabf6b238a3ca2d18d562b2e858bc08715dffe6855aaf32aa4e43d04d1f10ca6)
shop 1.4.0 tests on Ubuntu 24.04.5 LTS
ok - full refund returns the payment
ok - half refund splits the payment
ok - free order refunds nothing
3 passed
--- stderr.txt (0 B, sha256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)

# container.bash command="./bin/package" files="[\"dist/release.env\"]" checkpoint="release-package"
status: succeeded   exitCode: 0   truncated: false
--- stdout.txt (61 B, sha256 2aec6c47fed70189398e7c8c63a3d8134152a6b4668bf9109f7b8b01b93ea50c)
packaged dist/shop-1.4.0.tar.gz
dist/release.env: 4 settings
--- stderr.txt (0 B, sha256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)
--- files/dist/release.env (68 B, sha256 9f564b64ca9d4ed86d008113240de2c6a786c1b19639340b9a88dc169ff37921)
CURRENCY=USD
LOG_LEVEL=warn
RECEIPT_EMAILS=on
REFUND_WINDOW_DAYS=30

== Run: pr ==

# Test setup (your environment, not run by the plugin)
$ docker build --quiet --pull=false --network=none --tag shop-test:pr ./pr
sha256:b83b8cfb3206df7f7760bc04da0d113fb8b48e058b6324655625282f09ec7739
$ docker run --detach --pull=never --network=none --name shop-test-pr shop-test:pr
d2c3ea9cda2a04f21ec04ab50c960e427d60984b5b2624c91b2d65f8a9762069

# DockerUbuntu binding
{"container":"shop-test-pr","cwd":"/workspace"}

# container.bash command="./bin/test" checkpoint="tests"
status: succeeded   exitCode: 0   truncated: false
--- stdout.txt (153 B, sha256 dabf6b238a3ca2d18d562b2e858bc08715dffe6855aaf32aa4e43d04d1f10ca6)
shop 1.4.0 tests on Ubuntu 24.04.5 LTS
ok - full refund returns the payment
ok - half refund splits the payment
ok - free order refunds nothing
3 passed
--- stderr.txt (0 B, sha256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)

# container.bash command="./bin/package" files="[\"dist/release.env\"]" checkpoint="release-package"
status: succeeded   exitCode: 0   truncated: false
--- stdout.txt (61 B, sha256 2aec6c47fed70189398e7c8c63a3d8134152a6b4668bf9109f7b8b01b93ea50c)
packaged dist/shop-1.4.0.tar.gz
dist/release.env: 4 settings
--- stderr.txt (0 B, sha256 e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855)
--- files/dist/release.env (68 B, sha256 634287c85c5ec53a69f472c054948a17bc3331434296c605a8bb755c6f4fd378)
CURRENCY=USD
LOG_LEVEL=warn
RECEIPT_EMAILS=on
REFUND_WINDOW_DAYS=14

== Comparison: main run (before) -> pr run (after) ==

# tests: State and evidence unchanged (equal: true)
  stdout.txt: same bytes
  stderr.txt: same bytes

# release-package: State and evidence changed (equal: false)
  stdout.txt: same bytes
  stderr.txt: same bytes
  files/dist/release.env: 9f564b64ca9d -> 634287c85c5e

Artifact byte comparison above is derived from the retained digests; the plugin's comparison
reports the summary line.

== Fixture source: main ==

--- Dockerfile
# Synthetic marketing fixture: a tiny shop app in a clean Ubuntu 24.04 image.
FROM ubuntu@sha256:008173c23f95b170204355c12626cb5a965d779a7e1283b09e9cffbb1bf33ca3
WORKDIR /workspace
COPY . /workspace
CMD ["sleep", "infinity"]

--- VERSION
1.4.0

--- bin/package
#!/usr/bin/env bash
# Build the release archive and the settings it ships with.
set -euo pipefail
version=$(cat VERSION)
mkdir -p dist
declare -A settings
# Production values override defaults; the last assignment wins.
while IFS='=' read -r key value; do
  [[ -z $key || $key == \#* ]] && continue
  settings[$key]=$value
done < <(cat config/defaults.env config/production.env)
for key in "${!settings[@]}"; do printf '%s=%s\n' "$key" "${settings[$key]}"; done | LC_ALL=C sort > dist/release.env
tar -czf "dist/shop-$version.tar.gz" bin lib config VERSION dist/release.env
echo "packaged dist/shop-$version.tar.gz"
echo "dist/release.env: $(wc -l < dist/release.env) settings"

--- bin/test
#!/usr/bin/env bash
# Run the refund rules against the Bash in this environment.
set -euo pipefail
source lib/refund.sh
source /etc/os-release
echo "shop $(cat VERSION) tests on $PRETTY_NAME"
passed=0
check() {
  if [[ $3 == "$2" ]]; then echo "ok - $1"; passed=$((passed + 1))
  else echo "not ok - $1: expected $2, got $3"; exit 1; fi
}
check "full refund returns the payment" 25.00 "$(refund_amount 2500 full)"
check "half refund splits the payment" 12.50 "$(refund_amount 2500 half)"
check "free order refunds nothing" 0.00 "$(refund_amount 0 full)"
echo "$passed passed"

--- config/defaults.env
# Defaults for every environment.
CURRENCY=USD
LOG_LEVEL=info
RECEIPT_EMAILS=on
REFUND_WINDOW_DAYS=30

--- config/production.env
# Production overrides.
LOG_LEVEL=warn

--- lib/refund.sh
# refund_amount <paid cents> <full|half> -> dollars with two decimals
refund_amount() {
  local paid=$1 kind=$2 cents
  case $kind in
    full) cents=$paid ;;
    half) cents=$((paid / 2)) ;;
    *) return 2 ;;
  esac
  printf '%d.%02d\n' $((cents / 100)) $((cents % 100))
}

== Fixture change: main -> pr ==

diff -ru main/config/defaults.env pr/config/defaults.env
--- main/config/defaults.env
+++ pr/config/defaults.env
@@ -1,5 +1,5 @@
-# Defaults for every environment.
+# Defaults for every environment. Shorter refund window for local test fixtures.
 CURRENCY=USD
 LOG_LEVEL=info
 RECEIPT_EMAILS=on
-REFUND_WINDOW_DAYS=30
+REFUND_WINDOW_DAYS=14