Test

.dockerignore

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+.github/
+.devcontainer/
+.dependabot/

.github/workflows/test.yml

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+name: test
+
+on: [push]
+
+jobs:
+
+  test-implementation-job:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      # To use this repository's private action, you must check out the repository
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Test action step
+        uses: ./ # Uses an action in the root directory
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          source_repo: https://github.com/AndreasAugustin/template.git

Dockerfile

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 # image for dev build environment
 ######################################
 FROM alpine:3.11 as DEV
+
 # install packages
 RUN apk add --update --no-cache bash make git zsh curl tmux
 

README.md

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 # template
 
-![Lint](https://github.com/AndreasAugustin/template/workflows/Lint/badge.svg)
+![Lint](https://github.com/AndreasAugustin/actions-template-sync/workflows/Lint/badge.svg)
 
 ## DEV
 

action.yml

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+name: 'Template sync'
+description: 'Synchronises changes of the template repository'
+author: 'AndreasAugustin'
+branding:
+  icon: cloud
+  color: green
+inputs:
+  github_token:
+    description: 'Token for the repo. Can be passed in using $\{{ secrets.GITHUB_TOKEN }}'
+    required: true
+  source_repo:
+    description: 'Repository source of the. Default or empty value represents current github repository (${GITHUB_REPOSITORY})'
+    required: true
+runs:
+  using: 'docker'
+  image: 'src/Dockerfile'
+  env:
+    GITHUB_TOKEN: ${{ inputs.github_token }}
+    SOURCE_REPO: ${{ inputs.source_repo }}

src/Dockerfile

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+FROM alpine:3.11
+
+# labels
+LABEL \
+  "name"="GitHub template sync" \
+  "homepage"="https://github.com/marketplace/actions/github-template-sync" \
+  "repository"="https://github.com/AndreasAugustin/actions-template-sync" \
+  "maintainer"="Andreas Augustin <[email protected]>"
+
+# install packages
+RUN apk add --no-cache git bash openssh-client && \
+  echo "StrictHostKeyChecking no" >> /etc/ssh/ssh_config
+
+ADD *.sh /bin/
+RUN chmod +x /bin/entrypoint.sh
+
+ENTRYPOINT ["/bin/entrypoint.sh"]

src/entrypoint.sh

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+#! /usr/bin/env bash
+set -e
+
+[ -z "${GITHUB_TOKEN}" ] && {
+    echo "Missing input 'github_token: \${{ secrets.GITHUB_TOKEN }}'.";
+    exit 1;
+};
+
+if [[ -z "${SOURCE_REPO}" ]]; then
+  echo "Missing input 'source_repo: \${{ input.source_repo }}'.;"
+  exit 1
+fi
+
+UPSTREAM_REPO="${SOURCE_REPO}"
+SOURCE_BRANCH="master"
+NEW_BRANCH="chore/template_sync"
+
+echo "start sync"
+git config --unset-all http."https://github.com/".extraheader
+git remote set-url origin "https://$GITHUB_ACTOR:[email protected]/$GITHUB_REPOSITORY"
+git remote add tmp_upstream "$UPSTREAM_REPO"
+echo "fetching source repo ${UPSTREAM_REPO}"
+git fetch tmp_upstream
+git remote --verbose
+echo "push to new branch ${NEW_BRANCH}"
+git push origin "refs/remotes/tmp_upstream/${SOURCE_BRANCH}:refs/heads/${NEW_BRANCH}"
+echo "cleanup"
+git remote rm tmp_upstream
+git remote --verbose