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Update copier template version. Use when checking for template updates, running copier update, or applying template changes to the project structure.
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| name | update-template |
| description | Update copier template version. Use when checking for template updates, running copier update, or applying template changes to the project structure. |
Guide for updating the copier template (copier-dart-frb-wrapper) used to generate this project's structure.
When the CI creates a notification PR for a template update, follow these steps:
The automated PR contains:
Review the changelog to understand what changed in the template.
# Install/update copier (if not installed)
pip install copier jinja2-strcase
# Run copier update to the new version
copier update --trust --defaults --vcs-ref=vX.Y.Z
Flags:
--trust — required because the template has _tasks (post-generation commands). Without it, copier refuses to run or prompts for confirmation.--defaults — uses default values from .copier-answers.yml without prompting. Required in non-interactive environments (e.g., Claude Code), and recommended in general to avoid re-answering questions.--vcs-ref=vX.Y.Z — pins the exact version to update to.Copier will:
.copier-answers.yml (no interactive prompts)_tasks (post-generation commands like dart format).copier-answers.yml with the new _commit value# Check what copier changed
git diff
# Check for conflict markers
grep -r "<<<<<<" . --include="*.dart" --include="*.yml" --include="*.yaml" --include="*.md" --include="Makefile"
Common things to review:
.github/workflows/) — new steps, updated actionsscripts/) — new or updated scriptspubspec.yaml, analysis_options.yaml, etc.Copier creates .rej files for conflicts it couldn't resolve automatically:
# Find rejection files
find . -name "*.rej"
# Review and manually apply each one, then delete the .rej file
make analyze
make test
make format-check
Copier should update _commit automatically, but may fail to do so when:
Always check that _commit matches the target version, and update manually if needed:
_commit: vX.Y.Z # Must match the version you updated to
git add -A
git commit -m "feat: adopt copier template for version vX.Y.Z"
copier update --trust --defaults --vcs-ref=vX.Y.Z — apply template changes.rej files (if any)make analyze — no issuesmake test — all tests pass.copier-answers.yml — verify _commit updated automatically# Check if a template update is available
make check-template-updates
# JSON output for scripting
make check-template-updates ARGS="--json"
# Check against specific version
make check-template-updates ARGS="--version v1.7.0"
Check .copier-answers.yml:
_commit: v1.6.0
_src_path: https://github.com/djx-y-z/copier-dart-frb-wrapper.git
make check-template-updates
copier update --trust --defaults --vcs-ref=vX.Y.Z
make analyze
make test
git add -A
git commit -m "feat: adopt copier template for version vX.Y.Z"
Copier compares the template at _commit (old version) with the target version and applies the diff to your project. It:
.rej files for conflicts it can't auto-resolve_tasks (with --trust) — post-generation commands defined in the template.copier-answers.yml — sets _commit to the new version| Category | Examples |
|---|---|
| Workflows | New CI steps, updated action versions, new workflows |
| Makefile | New targets, changed commands, new setup steps |
| Scripts | New utility scripts, updated check scripts |
| Config | Analysis options, pubspec changes, gitignore updates |
| Documentation | CLAUDE.md, CONTRIBUTING.md, README template |
pip install copier jinja2-strcase
Copier creates .rej files — review each one and apply manually:
find . -name "*.rej"
# After resolving, delete the .rej files
find . -name "*.rej" -delete
Use --defaults to skip prompts. Without it, press Enter to keep current values from .copier-answers.yml. Only change values if you need to.
This is expected. Copier does a 3-way merge. If your customizations conflict with template changes, you'll get .rej files to resolve manually.