From 1ac01d728d93f634367b6482870b85726299784f Mon Sep 17 00:00:00 2001
From: Tim Paine <3105306+timkpaine@users.noreply.github.com>
Date: Tue, 1 Sep 2026 12:14:36 -0400
Subject: [PATCH] Add build workflow

Adds dry_run and path inputs so CI can run the action against a throwaway
copier project without pushing a branch or opening a pull request. The
fixture lives under RUNNER_TEMP because the action checks out the repo
itself, which would clean anything staged in the workspace.

Signed-off-by: Tim Paine <3105306+timkpaine@users.noreply.github.com>
---
 .github/workflows/build.yaml | 75 ++++++++++++++++++++++++++++++++++++
 update/action.yml            | 15 +++++++-
 2 files changed, 89 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/build.yaml

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
new file mode 100644
index 0000000..3c3d7db
--- /dev/null
+++ b/.github/workflows/build.yaml
@@ -0,0 +1,75 @@
+name: Build Status
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      with:
+        persist-credentials: false
+
+    - name: Build a copier template and a project generated from it
+      run: |
+        set -eux
+        git config --global user.name "github-actions"
+        git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
+        git config --global init.defaultBranch main
+        pip install copier
+
+        mkdir -p "$TEMPLATE"
+        cd "$TEMPLATE"
+        printf '_answers_file: .copier-answers.yaml\n\nproject_name:\n  type: str\n  default: demo\n' > copier.yml
+        printf 'hello {{ project_name }}\n' > hello.txt.jinja
+        printf '{{ _copier_answers|to_nice_yaml }}\n' > '{{ _copier_conf.answers_file }}.jinja'
+        git init -q .
+        git add -A
+        git commit -qm "template v1"
+        git tag v1
+
+        copier copy --defaults --vcs-ref v1 "$TEMPLATE" "$PROJECT"
+        cd "$PROJECT"
+        git init -q .
+        git add -A
+        git commit -qm "generated"
+
+        cd "$TEMPLATE"
+        printf 'goodbye {{ project_name }}\n' > bye.txt.jinja
+        git add -A
+        git commit -qm "template v2"
+        git tag v2
+      shell: bash
+      env:
+        TEMPLATE: ${{ runner.temp }}/template
+        PROJECT: ${{ runner.temp }}/project
+
+    - name: Run the update action
+      uses: ./update
+      with:
+        token: ${{ github.token }}
+        path: ${{ runner.temp }}/project
+        dry_run: true
+
+    - name: Verify the project was updated in place
+      run: |
+        set -eux
+        test -f "$PROJECT/bye.txt"
+        grep -q "goodbye demo" "$PROJECT/bye.txt"
+        git -C "$PROJECT" status --porcelain | grep -q .
+      shell: bash
+      env:
+        PROJECT: ${{ runner.temp }}/project
diff --git a/update/action.yml b/update/action.yml
index e114412..1aa7471 100644
--- a/update/action.yml
+++ b/update/action.yml
@@ -21,6 +21,16 @@ inputs:
     description: "Pull request title (default: 'Update from copier')"
     required: false
     default: "Update from copier"
+  dry_run:
+    type: boolean
+    description: "Run the update but do not push a branch or open a pull request"
+    required: false
+    default: false
+  path:
+    type: string
+    description: "Directory holding the copier-managed project"
+    required: false
+    default: "."
 
 
 runs:
@@ -39,12 +49,14 @@ runs:
 
     - run: copier update -A -f -a .copier-answers*
       shell: bash
+      working-directory: ${{ inputs.path }}
 
     - run: |
         if git status --porcelain -- ':!.copier-answers.yaml' ':!pnpm-lock.yaml' ':!js/pnpm-lock.yaml' ':!Cargo.lock' ':!rust/Cargo.lock' | grep -q .; then
           echo "COPIER_CHANGED=true" >> "$GITHUB_ENV"
         fi
       shell: bash
+      working-directory: ${{ inputs.path }}
 
     - if: env.COPIER_CHANGED == 'true' && hashFiles('pnpm-lock.yaml') != ''
       uses: pnpm/action-setup@0ebf47130e4866e96fce0953f49152a61190b271 # v6.0.9
@@ -80,7 +92,7 @@ runs:
       shell: bash
       continue-on-error: true
 
-    - if: env.COPIER_CHANGED == 'true'
+    - if: env.COPIER_CHANGED == 'true' && inputs.dry_run != 'true'
       run: |
         CURRENT_DATE=`date -u +"%Y-%m-%dT%H-%M-%S"`
         MESSAGE="${{  inputs.title }} from copier (`date -u +"%Y-%m-%dT%H:%M:%S"`)"
@@ -93,5 +105,6 @@ runs:
         git push origin $BRANCH
         gh pr create -B ${{  inputs.base }} -H $BRANCH --title "$MESSAGE" --body ""
       shell: bash
+      working-directory: ${{ inputs.path }}
       env:
         GITHUB_TOKEN: ${{ inputs.token }}