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Add workflow comparing Maven download progress: v5.4.0 vs v5.5.0 #3

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brunoborges merged 1 commit into from
Jul 8, 2026
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Add workflow comparing Maven download progress: v5.4.0 vs v5.5.0 #3

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142 changes: 142 additions & 0 deletions .github/workflows/maven-progress-compare.yml
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name: 'Maven download progress: v5.4.0 vs v5.5.0 (#1053)'

# Runs an IDENTICAL real Maven build under v5.4.0 and v5.5.0 so you can compare
# the logs directly. The only difference between the two jobs is the pinned
# setup-java commit:
# - v5.4.0 -> no -ntp in MAVEN_ARGS -> Maven prints "Downloading from ..." /
# "Progress (N): ... kB" transfer-progress lines.
# - v5.5.0 -> -ntp injected into MAVEN_ARGS by default -> those lines are gone.
#
# Each job builds with a fresh, isolated local repository so EVERY dependency and
# plugin is downloaded, maximizing the transfer-progress output that v5.5.0
# suppresses. Full build logs are uploaded as artifacts, and a summary job prints
# the transfer-progress line counts side by side.

on:
push:
branches: [main]
pull_request:
workflow_dispatch:

permissions:
contents: read

jobs:
build-v540:
name: 'v5.4.0 real build (shows download progress)'
runs-on: ubuntu-latest
outputs:
maven_args: ${{ steps.build.outputs.maven_args }}
progress_lines: ${{ steps.build.outputs.progress_lines }}
steps:
- uses: actions/checkout@v4
- uses: actions/setup-java@1bcf9fb12cf4aa7d266a90ae39939e61372fe520 # v5.4.0
with:
distribution: temurin
java-version: '21'
- name: Build with forced downloads
id: build
working-directory: maven-sample-project
shell: bash
run: |
set -uo pipefail
echo "MAVEN_ARGS='${MAVEN_ARGS:-}'"
# Empty, isolated local repo forces every dependency + plugin to download.
LR="$RUNNER_TEMP/m2-v540"
rm -rf "$LR"; mkdir -p "$LR"
mvn -B -Dmaven.repo.local="$LR" compile 2>&1 | tee build-v5.4.0.log
progress=$(grep -Ec "Downloading from|Downloaded from|Progress \(|[0-9]+/[0-9]+ [kKMG]?B" build-v5.4.0.log || true)
echo "maven_args=${MAVEN_ARGS:-}" >> "$GITHUB_OUTPUT"
echo "progress_lines=$progress" >> "$GITHUB_OUTPUT"
{
echo "### v5.4.0 real build"
echo ""
echo "- \`MAVEN_ARGS\` = \`${MAVEN_ARGS:-<empty>}\`"
echo "- Transfer-progress lines in log: **$progress**"
} >> "$GITHUB_STEP_SUMMARY"
- name: Upload v5.4.0 build log
uses: actions/upload-artifact@v4
with:
name: build-log-v5.4.0
path: maven-sample-project/build-v5.4.0.log

build-v550:
name: 'v5.5.0 real build (progress suppressed by default)'
runs-on: ubuntu-latest
outputs:
maven_args: ${{ steps.build.outputs.maven_args }}
progress_lines: ${{ steps.build.outputs.progress_lines }}
steps:
- uses: actions/checkout@v4
- uses: actions/setup-java@0f481fcb613427c0f801b606911222b5b6f3083a # v5.5.0
with:
distribution: temurin
java-version: '21'
- name: Build with forced downloads
id: build
working-directory: maven-sample-project
shell: bash
run: |
set -uo pipefail
echo "MAVEN_ARGS='${MAVEN_ARGS:-}'"
# Empty, isolated local repo forces every dependency + plugin to download.
LR="$RUNNER_TEMP/m2-v550"
rm -rf "$LR"; mkdir -p "$LR"
mvn -B -Dmaven.repo.local="$LR" compile 2>&1 | tee build-v5.5.0.log
progress=$(grep -Ec "Downloading from|Downloaded from|Progress \(|[0-9]+/[0-9]+ [kKMG]?B" build-v5.5.0.log || true)
echo "maven_args=${MAVEN_ARGS:-}" >> "$GITHUB_OUTPUT"
echo "progress_lines=$progress" >> "$GITHUB_OUTPUT"
{
echo "### v5.5.0 real build"
echo ""
echo "- \`MAVEN_ARGS\` = \`${MAVEN_ARGS:-<empty>}\`"
echo "- Transfer-progress lines in log: **$progress**"
} >> "$GITHUB_STEP_SUMMARY"
- name: Upload v5.5.0 build log
uses: actions/upload-artifact@v4
with:
name: build-log-v5.5.0
path: maven-sample-project/build-v5.5.0.log

compare:
name: 'Compare logs'
needs: [build-v540, build-v550]
runs-on: ubuntu-latest
steps:
- name: Download both build logs
uses: actions/download-artifact@v4
with:
path: logs
- name: Summarize the difference
shell: bash
run: |
set -uo pipefail
v540="${{ needs.build-v540.outputs.progress_lines }}"
v550="${{ needs.build-v550.outputs.progress_lines }}"
echo "v5.4.0 transfer-progress lines: $v540"
echo "v5.5.0 transfer-progress lines: $v550"

{
echo "## Maven download progress: v5.4.0 vs v5.5.0"
echo ""
echo "| setup-java | MAVEN_ARGS | Transfer-progress lines |"
echo "|------------|------------|-------------------------|"
echo "| v5.4.0 | \`${{ needs.build-v540.outputs.maven_args }}\` | $v540 |"
echo "| v5.5.0 | \`${{ needs.build-v550.outputs.maven_args }}\` | $v550 |"
echo ""
echo "Download the \`build-log-v5.4.0\` and \`build-log-v5.5.0\` artifacts to diff the full logs."
} >> "$GITHUB_STEP_SUMMARY"

# Sanity check: v5.4.0 should show progress, v5.5.0 should not.
if [ "${v550}" != "0" ]; then
echo "::warning::Expected 0 transfer-progress lines for v5.5.0 but got ${v550}"
fi
if [ "${v540}" = "0" ]; then
echo "::warning::Expected transfer-progress lines for v5.4.0 but got 0"
fi
echo ""
echo "----- v5.4.0 download lines (sample) -----"
grep -E "Downloading from|Progress \(" "logs/build-log-v5.4.0/build-v5.4.0.log" | head -n 20 || true
echo ""
echo "----- v5.5.0 download lines (sample) -----"
grep -E "Downloading from|Progress \(" "logs/build-log-v5.5.0/build-v5.5.0.log" | head -n 20 || echo "(none - suppressed by -ntp)"
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