git-batch-merge.yaml

apiVersion: tekton.dev/v1beta1
kind: Task
metadata:
  name: git-batch-merge
spec:
  workspaces:
    - name: output
      description: The git repo will be cloned onto the volume backing this workspace
  params:
    - name: url
      description: git url to clone
      type: string
    - name: revision
      description: base git revision to checkout (branch, tag, sha, ref…)
      type: string
      default: master
    - name: refspec
      description: base git refspec to fetch before checking out revision
      type: string
      default: "refs/heads/master:refs/heads/master"
    - name: batchedRefs
      description: git refs to fetch and batch on top of revision using the given mode (must be a valid refname, no commit SHA's)
      type: string
    - name: gitUserName
      description: git user name to use for creating the batched commit (First Last)
      type: string
      default: GitBatch Task
    - name: gitUserEmail
      description: git user email to use for creating the batched commit (First.Last@domain.com)
      type: string
      default: GitBatch.Task@tekton.dev
    - name: mode
      description: git operation to perform while batching (choose from merge, cherry-pick)
      type: string
      default: merge
    - name: submodules
      description: defines if the resource should initialize and fetch the submodules
      type: string
      default: "true"
    - name: depth
      description: performs a shallow clone where only the most recent commit(s) will be fetched
      type: string
      default: "1"
    - name: sslVerify
      description: defines if http.sslVerify should be set to true or false in the global git config
      type: string
      default: "true"
    - name: subdirectory
      description: subdirectory inside the "output" workspace to clone the git repo into
      type: string
      default: "src"
    - name: deleteExisting
      description: clean out the contents of the repo's destination directory (if it already exists) before trying to clone the repo there
      type: string
      default: "false"
  results:
    - name: commit
      description: The final commit SHA that was obtained after batching all provided refs onto revision
    - name: tree
      description: The git tree SHA that was obtained after batching all provided refs onto revision.
  steps:
    - name: clone
      image: gcr.io/tekton-releases/github.com/tektoncd/pipeline/cmd/git-init:v0.12.1
      script: |
        CHECKOUT_DIR="$(workspaces.output.path)/$(params.subdirectory)"

        cleandir() {
          # Delete any existing contents of the repo directory if it exists.
          #
          # We don't just "rm -rf $CHECKOUT_DIR" because $CHECKOUT_DIR might be "/"
          # or the root of a mounted volume.
          if [[ -d "$CHECKOUT_DIR" ]] ; then
            # Delete non-hidden files and directories
            rm -rf "$CHECKOUT_DIR"/*
            # Delete files and directories starting with . but excluding ..
            rm -rf "$CHECKOUT_DIR"/.[!.]*
            # Delete files and directories starting with .. plus any other character
            rm -rf "$CHECKOUT_DIR"/..?*
          fi
        }

        if [[ "$(params.deleteExisting)" == "true" ]] ; then
          cleandir
        fi

        p="$(params.batchedRefs)"
        refs="$(params.refspec)"
        for ref in $p; do
          refs="$refs $ref:refs/batch/$ref"
        done

        /ko-app/git-init \
          -url "$(params.url)" \
          -revision "$(params.revision)" \
          -refspec "$refs" \
          -path "$CHECKOUT_DIR" \
          -sslVerify="$(params.sslVerify)" \
          -submodules="$(params.submodules)" \
          -depth "$(params.depth)"

        git -C $CHECKOUT_DIR config user.name "$(params.gitUserName)"
        git -C $CHECKOUT_DIR config user.email "$(params.gitUserEmail)"

        mode="$(params.mode)"
        if [[ $mode == "merge" ]]; then
          for ref in $p; do
             git -C $CHECKOUT_DIR merge --quiet --allow-unrelated-histories refs/batch/$ref
          done
        elif [[ $mode == "cherry-pick" ]]; then
          for ref in $p; do
             git -C $CHECKOUT_DIR cherry-pick --allow-empty --keep-redundant-commits refs/batch/$ref
          done
        else
            echo "unsupported mode $mode"
            exit 1
        fi

        RESULT_SHA="$(git -C $CHECKOUT_DIR rev-parse HEAD)"
        TREE_SHA="$(git -C $CHECKOUT_DIR rev-parse HEAD^{tree})"
        # Make sure we don't add a trailing newline to the result!
        echo -n "$(echo $RESULT_SHA | tr -d '\n')" > $(results.commit.path)
        echo -n "$(echo $TREE_SHA | tr -d '\n')" > $(results.tree.path)