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chore: remove copyleft files and add fork tooling
Remove GPL/AGPL-licensed files from the tree: - test/test-stdio/test-printf.c - test/test-stdio/test-printf-testcases.h - scripts/GeneratePicolibcCrossFile.sh - COPYING.GPL2 Add fork infrastructure: - COPYLEFT_EXCLUSIONS: manifest of removed files - scripts/import-upstream.sh: cherry-pick upstream commits with filtering - .github/workflows/license-check.yml: scancode CI for copyleft detection - .github/workflows/update-upstream.yml: manual upstream import workflow - .github/workflows/tag-release.yml: auto-tag on PR merge - license-policy.yml: scancode policy for forbidden licenses - README.md: fork documentation, upstream README preserved as README.upstream.md
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‎.github/workflows/license-check.yml‎

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name: License Check
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on:
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push:
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branches: [main]
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pull_request:
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branches: [main]
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jobs:
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scancode:
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name: Scancode License Scan
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v6
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- name: Set up Python
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uses: actions/setup-python@v6
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with:
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python-version: "3.12"
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- name: Install scancode-toolkit
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run: pip install 'scancode-toolkit==32.3.0'
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- name: Scan licenses
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run: |
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scancode \
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--license \
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--license-policy license-policy.yml \
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--only-findings \
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--processes "$(nproc)" \
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--json-pp scancode-results.json \
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--ignore ".git/*" \
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--ignore ".github/*" \
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--ignore "scripts/import-upstream.sh" \
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--ignore "COPYLEFT_EXCLUSIONS" \
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--ignore "COPYING.picolibc" \
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--ignore "find-copyright" \
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--ignore "license-policy.yml" \
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--ignore "README.md" \
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--ignore "README.upstream.md" \
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.
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- name: Check for unapproved licenses
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run: |
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jq -r '
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[.files[]
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| select(.license_detections | length > 0)
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| select(.license_policy | length == 0)]
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| if length > 0 then
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"Unapproved licenses found:",
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(.[] | " \(.path): \(.detected_license_expression_spdx)"),
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halt_error(1)
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else
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"All detected licenses are approved."
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end
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' scancode-results.json
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- name: Upload scancode results
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if: always()
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uses: actions/upload-artifact@v7
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with:
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name: scancode-results
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path: scancode-results.json
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exclusions-check:
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name: COPYLEFT_EXCLUSIONS Consistency
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v6
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- name: Verify excluded paths do not exist
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run: |
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awk '!/^#/ && NF { if (system("test ! -e " $0)) { print "ERROR: Excluded file found: " $0; exit 1 } }' COPYLEFT_EXCLUSIONS
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echo "All excluded paths are absent from the tree."

‎.github/workflows/tag-release.yml‎

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name: Tag Release
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on:
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pull_request:
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types: [closed]
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branches: [main]
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permissions:
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contents: write
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jobs:
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tag:
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name: Create version tag
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if: github.event.pull_request.merged && startsWith(github.event.pull_request.head.ref, 'update-upstream-')
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v6
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- name: Create tag
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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run: |
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version="${GITHUB_HEAD_REF#update-upstream-}"
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tag="${version}-bsd"
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echo "Creating tag: $tag"
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gh release create "$tag" --title "picolibc ${version} (BSD)" --notes "Based on upstream picolibc ${version}"

‎.github/workflows/update-upstream.yml‎

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name: Update from Upstream
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on:
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workflow_dispatch:
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inputs:
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to_ref:
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description: "Upstream version tag to import up to, e.g., 1.9.0"
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required: true
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type: string
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permissions:
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contents: write
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pull-requests: write
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jobs:
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update:
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name: Import Upstream Commits
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runs-on: ubuntu-latest
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steps:
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- name: Checkout
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uses: actions/checkout@v6
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with:
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fetch-depth: 0
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token: ${{ secrets.GITHUB_TOKEN }}
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- name: Configure git
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run: |
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git config user.name "github-actions[bot]"
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git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
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- name: Import upstream commits
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id: import
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run: |
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# Auto-detect from_ref: find latest *-bsd tag, strip suffix to get upstream ref
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from=$(git tag -l '*-bsd' --sort=-v:refname | head -1 | sed 's/-bsd$//')
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if [ -z "$from" ]; then
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echo "No *-bsd tags found. Tag the initial import first (e.g., git tag 1.8.11-bsd)." >&2
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exit 1
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fi
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target="${{ inputs.to_ref }}"
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branch="update-upstream-${target}"
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git branch -D "$branch" 2>/dev/null || true
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git push origin --delete "$branch" 2>/dev/null || true
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git checkout -b "$branch"
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scripts/import-upstream.sh "$from" "$target" 2>&1 | tee import-log.txt
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imported=$(grep -oP 'Imported: \K[0-9]+' import-log.txt || echo "0")
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echo "imported=$imported" >> "$GITHUB_OUTPUT"
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echo "branch=$branch" >> "$GITHUB_OUTPUT"
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echo "from=$from" >> "$GITHUB_OUTPUT"
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- name: Create or update PR
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if: steps.import.outputs.imported != '0'
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env:
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GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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TARGET: ${{ inputs.to_ref }}
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BRANCH: ${{ steps.import.outputs.branch }}
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FROM: ${{ steps.import.outputs.from }}
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run: |
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git push origin "$BRANCH"
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# Generate PR body
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cat > pr-body.md <<EOF
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## Upstream Update: picolibc ${TARGET}
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**Upstream compare**: [${FROM:0:12}...${TARGET}](https://github.com/picolibc/picolibc/compare/${FROM:0:12}...${TARGET})
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### Imported commits
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$(git log --oneline main..HEAD | head -50)
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### Checklist
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- [ ] Review imported commits
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- [ ] Verify license scan passes
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- [ ] Update version table in README.md
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- [ ] Merge with **rebase** to preserve commit history
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- [ ] After merge, tag will be created automatically
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EOF
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existing_pr=$(gh pr list --head "$BRANCH" --json number --jq '.[0].number' 2>/dev/null || true)
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if [[ -n "$existing_pr" ]]; then
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gh pr edit "$existing_pr" --title "Update from upstream picolibc ${TARGET}" --body-file pr-body.md
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else
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gh pr create --base main --head "$BRANCH" --title "Update from upstream picolibc ${TARGET}" --body-file pr-body.md
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fi

‎COPYLEFT_EXCLUSIONS‎

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# Copyleft Exclusions
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#
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# Files excluded from this fork because they are under copyleft licenses.
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# Used by scripts/import-upstream.sh and CI license checks.
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# One path per line. Lines starting with # are comments.
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# GPL-2.0-or-later: Printf test suite by Bart Massey
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test/test-stdio/test-printf.c
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test/test-stdio/test-printf-testcases.h
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# AGPL-3.0-or-later: Meson cross-file generator script
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scripts/GeneratePicolibcCrossFile.sh
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# GPL-2.0-only: GPL license text file
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COPYING.GPL2

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