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Adding `WhenExpressions` used to efficiently specify guarded execution of `Tasks`, without spinning up new pods. We use `WhenExpressions` to avoid adding an opinionated and complex expression language to the Tekton API to ensure Tekton can be supported by as many systems as possible. The components of `WhenExpressions` are `Input`, `Operator` and `Values`: - `Input` is the input for the `Guard` checking which can be static inputs or variables, such as `Parameters` or `Results`. - `Values` is an array of string values. The `Values` array must be non-empty. It can contain static values or variables (`Parameters` or `Results`). - `Operator` represents an `Input`'s relationship to a set of `Values`. `Operators` we will use in `WhenExpressions` are `In` and `NotIn`. The declared `WhenExpressions` are evaluated before the `Task` is run. If all the `WhenExpressions` evaluate to `True`, the `Task` is run. If any of the `WhenExpressions` evaluate to `False`, the `Task` is skipped. Further details in [Conditions Beta TEP](https://github.com/tektoncd/community/blob/master/teps/0007-conditions-beta.md).
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examples/v1beta1/pipelineruns/pipelinerun-with-when-expressions.yaml
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,239 @@ | ||
| # Copied from https://github.com/tektoncd/catalog/blob/v1beta1/git/git-clone.yaml :( | ||
| # This can be deleted after we add support to refer to the remote Task in a registry (Issue #1839) or | ||
| # add support for referencing task in git directly (issue #2298) | ||
| apiVersion: tekton.dev/v1beta1 | ||
| kind: Task | ||
| metadata: | ||
| name: git-clone-from-catalog | ||
| 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: git revision to checkout (branch, tag, sha, ref…) | ||
| type: string | ||
| default: master | ||
| - name: refspec | ||
| description: (optional) git refspec to fetch before checking out revision | ||
| default: "" | ||
| - 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: "" | ||
| - 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" | ||
| - name: httpProxy | ||
| description: git HTTP proxy server for non-SSL requests | ||
| type: string | ||
| default: "" | ||
| - name: httpsProxy | ||
| description: git HTTPS proxy server for SSL requests | ||
| type: string | ||
| default: "" | ||
| - name: noProxy | ||
| description: git no proxy - opt out of proxying HTTP/HTTPS requests | ||
| type: string | ||
| default: "" | ||
| results: | ||
| - name: commit | ||
| description: The precise commit SHA that was fetched by this Task | ||
| 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 | ||
| test -z "$(params.httpProxy)" || export HTTP_PROXY=$(params.httpProxy) | ||
| test -z "$(params.httpsProxy)" || export HTTPS_PROXY=$(params.httpsProxy) | ||
| test -z "$(params.noProxy)" || export NO_PROXY=$(params.noProxy) | ||
| /ko-app/git-init \ | ||
| -url "$(params.url)" \ | ||
| -revision "$(params.revision)" \ | ||
| -refspec "$(params.refspec)" \ | ||
| -path "$CHECKOUT_DIR" \ | ||
| -sslVerify="$(params.sslVerify)" \ | ||
| -submodules="$(params.submodules)" \ | ||
| -depth "$(params.depth)" | ||
| cd "$CHECKOUT_DIR" | ||
| RESULT_SHA="$(git rev-parse HEAD | tr -d '\n')" | ||
| EXIT_CODE="$?" | ||
| if [ "$EXIT_CODE" != 0 ] | ||
| then | ||
| exit $EXIT_CODE | ||
| fi | ||
| # Make sure we don't add a trailing newline to the result! | ||
| echo -n "$RESULT_SHA" > $(results.commit.path) | ||
| --- | ||
| apiVersion: tekton.dev/v1beta1 | ||
| kind: Task | ||
| metadata: | ||
| name: check-file | ||
| spec: | ||
| params: | ||
| - name: path | ||
| workspaces: | ||
| - name: source | ||
| description: The workspace to check for the file. | ||
| results: | ||
| - name: status | ||
| description: indicating whether the file exists | ||
| steps: | ||
| - name: check-file | ||
| image: alpine | ||
| script: | | ||
| if test -f $(workspaces.source.path)/$(params.path); then | ||
| printf exists | tee /tekton/results/status | ||
| else | ||
| printf missing | tee /tekton/results/status | ||
| fi | ||
| --- | ||
| apiVersion: tekton.dev/v1beta1 | ||
| kind: Pipeline | ||
| metadata: | ||
| name: guarded-pipeline | ||
| spec: | ||
| params: | ||
| - name: path | ||
| type: string | ||
| description: The path of the file to be created. | ||
| default: "README.md" | ||
| - name: repo-url | ||
| type: string | ||
| description: The git repository URL to clone from. | ||
| - name: branch-name | ||
| type: string | ||
| description: The git branch to clone. | ||
| workspaces: | ||
| - name: source-repo | ||
| description: | | ||
| This workspace will receive the cloned git repo and be passed | ||
| to the next Task to create a file. | ||
| tasks: | ||
| - name: fetch-repo | ||
| taskRef: | ||
| name: git-clone-from-catalog | ||
| params: | ||
| - name: url | ||
| value: $(params.repo-url) | ||
| - name: revision | ||
| value: $(params.branch-name) | ||
| workspaces: | ||
| - name: output | ||
| workspace: source-repo | ||
| - name: create-file | ||
| when: | ||
| - input: "$(params.path)" | ||
| operator: in | ||
| values: ["README.md"] | ||
| workspaces: | ||
| - name: source | ||
| workspace: source-repo | ||
| runAfter: | ||
| - fetch-repo | ||
| taskSpec: | ||
| workspaces: | ||
| - name: source | ||
| description: The workspace to create the readme file in. | ||
| steps: | ||
| - name: write-new-stuff | ||
| image: ubuntu | ||
| script: 'touch $(workspaces.source.path)/README.md' | ||
| - name: check-file | ||
| when: | ||
| - input: "foo" | ||
| operator: in | ||
| values: ["foo", "bar"] | ||
| params: | ||
| - name: path | ||
| value: "$(params.path)" | ||
| workspaces: | ||
| - name: source | ||
| workspace: source-repo | ||
| taskRef: | ||
| name: check-file | ||
| runAfter: | ||
| - create-file | ||
| - name: echo-file-exists | ||
| when: | ||
| - input: "$(tasks.check-file.results.status)" | ||
| operator: in | ||
| values: ["exists"] | ||
| taskSpec: | ||
| steps: | ||
| - name: echo | ||
| image: ubuntu | ||
| script: 'echo file exists' | ||
| - name: task-should-be-skipped | ||
| when: | ||
| - input: "foo" | ||
| operator: notin | ||
| values: ["foo"] | ||
| - input: "foo" | ||
| operator: in | ||
| values: ["bar"] | ||
| taskSpec: | ||
| steps: | ||
| - name: echo | ||
| image: ubuntu | ||
| script: exit 1 | ||
| --- | ||
| apiVersion: tekton.dev/v1beta1 | ||
| kind: PipelineRun | ||
| metadata: | ||
| name: guarded-pr | ||
| spec: | ||
| serviceAccountName: 'default' | ||
| pipelineRef: | ||
| name: guarded-pipeline | ||
| params: | ||
| - name: repo-url | ||
| value: https://github.com/tektoncd/pipeline.git | ||
| - name: branch-name | ||
| value: master | ||
| workspaces: | ||
| - name: source-repo | ||
| volumeClaimTemplate: | ||
| spec: | ||
| accessModes: | ||
| - ReadWriteOnce | ||
| resources: | ||
| requests: | ||
| storage: 1Gi |
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