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diff --git a/doc/ci/variables/README.md b/doc/ci/variables/README.md index 12b027e7d79..6532d177d2c 100644 --- a/doc/ci/variables/README.md +++ b/doc/ci/variables/README.md @@ -2,49 +2,244 @@ table_display_block: true --- -# GitLab CI/CD Variables +# GitLab CI/CD environment variables +{: #variables} -When receiving a job from GitLab CI, the [Runner](https://docs.gitlab.com/runner/) prepares the build environment. -It starts by setting a list of: +After a brief overview over the use of environment +variables, this document teaches you how to use GitLab CI/CD's +variables, presents the full reference for predefined variables, +and dives into more advanced applications. -- [Predefined environment variables](#predefined-environment-variables). -- Other variables. +## Overview -## Priority of variables +An environment variable is a dynamic-named value that can +affect the way running processes will behave on an operating +system. -Variables of different types can take precedence over other variables, depending on where they are defined. +They are part of the environment in which a process runs. +For example, a running process can query the value of the +`TEMP` environment variable to discover a suitable location +to store temporary files, or to define a `URL` for a database +that can be reused in different scripts. -The order of precedence for variables is (from highest to lowest): +Variables are useful for customizing your jobs in GitLab +CI/CD's pipelines. Using variables means no hardcoded values. -1. [Trigger variables](../triggers/README.md#making-use-of-trigger-variables) or [scheduled pipeline variables](../../user/project/pipelines/schedules.md#making-use-of-scheduled-pipeline-variables). -1. Project-level [variables](#variables) or [protected variables](#protected-variables). -1. Group-level [variables](#variables) or [protected variables](#protected-variables). -1. YAML-defined [job-level variables](../yaml/README.md#variables). -1. YAML-defined [global variables](../yaml/README.md#variables). -1. [Deployment variables](#deployment-variables). -1. [Predefined environment variables](#predefined-environment-variables). +### Predefined environment variables -For example, you define: +GitLab CI/CD has a default set of +[predefined variables](predefined_variables.md) +which can be used without any specification needed. +You can call issues numbers, user names, branch names, +pipeline and commit IDs, and much more. -- `API_TOKEN=secure` as a project variable. -- `API_TOKEN=yaml` in your `.gitlab-ci.yml`. +Predefined environment variables are the ones that GitLab +provides out of the box for the local environment of the Runner. -`API_TOKEN` will take the value `secure` as the project variables take precedence over those defined -in `.gitlab-ci.yml`. +GitLab reads the .gitlab-ci.yml file, sends the information +to the Runner (which runs the script commands), under which +the variables are exposed. -## Unsupported variables +For example, two jobs under the same pipeline can share the same +`CI_PIPELINE_ID` variable, but each one has its own `CI_JOB_ID` +variable. -There are cases where some variables cannot be used in the context of a -`.gitlab-ci.yml` definition (for example under `script`). Read more -about which variables are [not supported](where_variables_can_be_used.md). +### Custom environment variables + +When your use case requires a specific variable, you can +[set them up easily from the UI](#creating-a-custom-environment-variable) +or directly in the `.gitlab-ci.yml` file and reuse them as you wish. + +That can be very powerful as it can be used for scripting without +the need to specify the value itself. + +## Getting started + +To get started with environment variables in the scope of GitLab +CI/CD, let's go over a few examples. + +### Using predefined environment variables + +To get started, choose one of the existing +[predefined variables](predefined_variables.md) +to be output by the Runner. For example, let's say that you want +a given job you're running through your script to output the +stage that job is running for. In your `.gitlab-ci.yml` file, +call the variable from your script according to the [syntaxes](#syntax-of-variables-in-job-scripts) available. To +output the job stage, use the predefined variable `CI_JOB_STAGE`: + +```yaml +test_variable: + stage: test + script: + - echo $CI_JOB_STAGE +``` + +For this case, the Runner will output the `stage` for the +job `test_variable`, which is `test`: + +![Output `$CI_JOB_STAGE`](img/ci_job_stage_output_example.png) + +As another example, let's say you're using your own GitLab +instance you want to know what domain your GitLab Pages are +served under. You can easily call it with the predefined +variable `$CI_PAGES_DOMAIN` in your script: + +```yaml +pages: + script: + - ... + - echo $CI_PAGES_DOMAIN +``` + +For GitLab.com users, the output will be `gitlab.io`. For your +private instance, the output will be whatever your sysadmin has +defined. + +### Creating a custom environment variable + +Assume you have something you want to repeat through your scripts +in GitLab CI/CD's configuration file. To keep this example simple, +let's say you want to output `HELLO WORLD` for a `TEST` variable. + +You can either set the variable directly in the `.gitlab-ci.yml` +file or through the UI. + +#### Via [`.gitlab-ci.yml`](../yaml/README.md#variables) + +```yaml +variables: + TEST: "HELLO WORLD" +``` + +For a deeper look into them, see [`.gitlab-ci.yml` defined variables](#gitlab-ciyml-defined-variables). + +#### Via the UI + +From the UI, navigate to your project's **Settings > CI/CD** and +expand **Environment variables**. Create a new variable by naming +it in the field **Input variable key**, and define its value in the +**Input variable value** field: + +![CI/CD settings - new variable](img/new_custom_variable_example.png) + +Once you've set the variables, call them from the `.gitlab-ci.yml` file: + +```yaml +test_variable: + stage: test + script: + - echo $CI_JOB_STAGE # calls a predefined variable + - echo $TEST # calls a custom variable +``` + +The output will be: + +![Output custom variable](img/custom_variable_output.png) + +CAUTION: **Important:** +Be aware that variables are not masked, and their values can be shown +in the job logs if explicitly asked to do so. If your project is public or +internal, you can set the pipelines private from your [project's Pipelines +settings](../../user/project/pipelines/settings.md#visibility-of-pipelines). +Follow the discussion in issue [#13784][ce-13784] for masking the variables. + +### Syntax of environment variables in job scripts +{: #syntax-of-variables-in-job-scripts} -## Predefined environment variables +All variables are set as environment variables in the build environment, and +they are accessible with normal methods that are used to access such variables. +In most cases `bash` or `sh` is used to execute the job script. + +To access environment variables, use the syntax for your Runner's [shell][shellexecutors]. + +| Shell | Usage | +|----------------------|-----------------| +| bash/sh | `$variable` | +| windows batch | `%variable%` | +| PowerShell | `$env:variable` | + +To access environment variables in bash, prefix the variable name with (`$`): + +```yaml +job_name: + script: + - echo $CI_JOB_ID +``` + +To access environment variables in **Windows Batch**, surround the variable +with (`%`): + +```yaml +job_name: + script: + - echo %CI_JOB_ID% +``` -See [full reference of predefined environment variables](predefined_variables.md). +To access environment variables in a **Windows PowerShell** environment, prefix +the variable name with (`$env:`): + +```yaml +job_name: + script: + - echo $env:CI_JOB_ID +``` + +You can also list all environment variables with the `export` command, +but be aware that this will also expose the values of all the variables +you set, in the job log: + +```yaml +job_name: + script: + - export +``` + +Example values: + +```bash +export CI_JOB_ID="50" +export CI_COMMIT_SHA="1ecfd275763eff1d6b4844ea3168962458c9f27a" +export CI_COMMIT_SHORT_SHA="1ecfd275" +export CI_COMMIT_REF_NAME="master" +export CI_REPOSITORY_URL="https://gitlab-ci-token:abcde-1234ABCD5678ef@example.com/gitlab-org/gitlab-ce.git" +export CI_COMMIT_TAG="1.0.0" +export CI_JOB_NAME="spec:other" +export CI_JOB_STAGE="test" +export CI_JOB_MANUAL="true" +export CI_JOB_TRIGGERED="true" +export CI_JOB_TOKEN="abcde-1234ABCD5678ef" +export CI_PIPELINE_ID="1000" +export CI_PIPELINE_IID="10" +export CI_PAGES_DOMAIN="gitlab.io" +export CI_PAGES_URL="https://gitlab-org.gitlab.io/gitlab-ce" +export CI_PROJECT_ID="34" +export CI_PROJECT_DIR="/builds/gitlab-org/gitlab-ce" +export CI_PROJECT_NAME="gitlab-ce" +export CI_PROJECT_NAMESPACE="gitlab-org" +export CI_PROJECT_PATH="gitlab-org/gitlab-ce" +export CI_PROJECT_URL="https://example.com/gitlab-org/gitlab-ce" +export CI_REGISTRY="registry.example.com" +export CI_REGISTRY_IMAGE="registry.example.com/gitlab-org/gitlab-ce" +export CI_RUNNER_ID="10" +export CI_RUNNER_DESCRIPTION="my runner" +export CI_RUNNER_TAGS="docker, linux" +export CI_SERVER="yes" +export CI_SERVER_NAME="GitLab" +export CI_SERVER_REVISION="70606bf" +export CI_SERVER_VERSION="8.9.0" +export CI_SERVER_VERSION_MAJOR="8" +export CI_SERVER_VERSION_MINOR="9" +export CI_SERVER_VERSION_PATCH="0" +export GITLAB_USER_ID="42" +export GITLAB_USER_EMAIL="user@example.com" +export CI_REGISTRY_USER="gitlab-ci-token" +export CI_REGISTRY_PASSWORD="longalfanumstring" +``` -## `.gitlab-ci.yml` defined variables +### `.gitlab-ci.yml` defined variables -NOTE **Note:** +NOTE: **Note:** This feature requires GitLab Runner 0.5.0 or higher and GitLab 7.14 or higher. GitLab CI allows you to add to `.gitlab-ci.yml` variables that are set in the @@ -82,42 +277,63 @@ script: - 'eval $LS_CMD' # will execute 'ls -al $TMP_DIR' ``` -## Variables +### Group-level environment variables +{: #group-level-variables} -> Group-level variables were introduced in GitLab 9.4. - -CAUTION: **Important:** -Be aware that variables are not masked, and their values can be shown -in the job logs if explicitly asked to do so. If your project is public or -internal, you can set the pipelines private from your [project's Pipelines -settings](../../user/project/pipelines/settings.md#visibility-of-pipelines). -Follow the discussion in issue [#13784][ce-13784] for masking the variables. +> Introduced in GitLab 9.4. -GitLab CI allows you to define per-project or per-group variables -that are set in the pipeline environment. The variables are stored out of +GitLab CI/CD allows you to define per-project or per-group variables +that are set in the pipeline environment. Group-level variables are stored out of the repository (not in `.gitlab-ci.yml`) and are securely passed to GitLab Runner -making them available during a pipeline run. It's the recommended method to +making them available during a pipeline run. It's the **recommended method** to use for storing things like passwords, SSH keys, and credentials. -Project-level variables can be added by: +Group-level variables can be added by: -1. Navigating to your project's **Settings > CI/CD** page. +1. Navigating to your group's **Settings > CI/CD** page. 1. Inputing variable keys and values in the **Environment variables** section. +Any variables of [subgroups](../../user/group/subgroups/index.md) will be inherited recursively. -Group-level variables can be added by: +Once you set them, they will be available for all subsequent pipelines. -1. Navigating to your group's **Settings > CI/CD** page. -1. Inputing variable keys and values in the **Environment variables** section. Any variables of - [subgroups](../../user/group/subgroups/index.md) will be inherited recursively. +## Priority of environment variables +{: #priority-of-variables} + +Variables of different types can take precedence over other +variables, depending on where they are defined. + +The order of precedence for variables is (from highest to lowest): + +1. [Trigger variables](../triggers/README.md#making-use-of-trigger-variables) or [scheduled pipeline variables](../../user/project/pipelines/schedules.md#making-use-of-scheduled-pipeline-variables). +1. Project-level [variables](#creating-a-custom-environment-variable) or [protected variables](#protected-variables). +1. Group-level [variables](#group-level-variables) or [protected variables](#protected-variables). +1. YAML-defined [job-level variables](../yaml/README.md#variables). +1. YAML-defined [global variables](../yaml/README.md#variables). +1. [Deployment variables](#deployment-variables). +1. [Predefined environment variables](predefined_variables.md). + +For example, if you define: + +- `API_TOKEN=secure` as a project variable. +- `API_TOKEN=yaml` in your `.gitlab-ci.yml`. -Once you set them, they will be available for all subsequent pipelines. You can also -[protect your variables](#protected-variables). +`API_TOKEN` will take the value `secure` as the project +variables take precedence over those defined in `.gitlab-ci.yml`. -### Protected variables +## Unsupported variables + +There are cases where some variables cannot be used in the context of a +`.gitlab-ci.yml` definition (for example under `script`). Read more +about which variables are [not supported](where_variables_can_be_used.md). + +## Advanced use + +### Protected environment variables +{: #protected-variables} > Introduced in GitLab 9.3. -Variables could be protected. Whenever a variable is +Variables can be protected. Whenever a variable is protected, it would only be securely passed to pipelines running on the [protected branches] or [protected tags]. The other pipelines would not get any protected variables. @@ -128,13 +344,8 @@ Protected variables can be added by going to your project's Once you set them, they will be available for all subsequent pipelines. -### Manually-specified variables - -> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/44059) in GitLab 10.8. - -Variables can be specified for a single pipeline run when a [manual pipeline](../pipelines.md#manually-executing-pipelines) is created. - -## Deployment variables +### Deployment environment variables +{: #deployment-variables} > Introduced in GitLab 8.15. @@ -147,7 +358,7 @@ the project services that you are using to learn which variables they define. An example project service that defines deployment variables is the [Kubernetes integration](../../user/project/clusters/index.md#deployment-variables). -## Auto DevOps application variables +### Auto DevOps environment variables > [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/49056) in GitLab 11.7. @@ -164,6 +375,113 @@ CAUTION: **Caution:** Variables with multiline values are not currently supported due to limitations with the current Auto DevOps scripting environment. +### Environment variables triggered manually + +> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/issues/44059) in GitLab 10.8. + +[Manually triggered pipelines](../pipelines.md#manually-executing-pipelines) allow you to override the value of a current variable. + +For instance, suppose you added a +[custom variable `$TEST`](#creating-a-custom-variable) +as exemplified above and you want to override it in a manual pipeline. +Navigate to your project's **CI/CD > Pipelines** and click **Run pipeline**. +Choose the branch you want to run the pipeline for, then add a new variable +pair through the UI: + +![Override variable value](img/override_variable_manual_pipeline.png) + +The Runner will override the value previously set and use the custom +value you set for this specific pipeline: + +![Manually overridden variable output](img/override_value_via_manual_pipeline_output.png) + +## Environment variables expressions +{: #variables-expressions} + +> Introduced in GitLab 10.7. + +It is possible to use variables expressions with only / except policies in +`.gitlab-ci.yml`. By using this approach you can limit what jobs are going to +be created within a pipeline after pushing a code to GitLab. + +This is particularly useful in combination with variables and triggered +pipeline variables. + +```yaml +deploy: + script: cap staging deploy + environment: staging + only: + variables: + - $RELEASE == "staging" + - $STAGING +``` + +Each expression provided is going to be evaluated before creating a pipeline. + +If any of the conditions in `variables` evaluates to truth when using `only`, +a new job is going to be created. If any of the expressions evaluates to truth +when `except` is being used, a job is not going to be created. + +This follows usual rules for [`only` / `except` policies](../yaml/README.md#onlyexcept-advanced). + +### Supported syntax + +Below you can find supported syntax reference: + +1. Equality matching using a string + + > Example: `$VARIABLE == "some value"` + + You can use equality operator `==` to compare a variable content to a + string. We support both, double quotes and single quotes to define a string + value, so both `$VARIABLE == "some value"` and `$VARIABLE == 'some value'` + are supported. `"some value" == $VARIABLE` is correct too. + +1. Checking for an undefined value + + > Example: `$VARIABLE == null` + + It sometimes happens that you want to check whether a variable is defined + or not. To do that, you can compare a variable to `null` keyword, like + `$VARIABLE == null`. This expression is going to evaluate to truth if + variable is not defined. + +1. Checking for an empty variable + + > Example: `$VARIABLE == ""` + + If you want to check whether a variable is defined, but is empty, you can + simply compare it against an empty string, like `$VAR == ''`. + +1. Comparing two variables + + > Example: `$VARIABLE_1 == $VARIABLE_2` + + It is possible to compare two variables. This is going to compare values + of these variables. + +1. Variable presence check + + > Example: `$STAGING` + + If you only want to create a job when there is some variable present, + which means that it is defined and non-empty, you can simply use + variable name as an expression, like `$STAGING`. If `$STAGING` variable + is defined, and is non empty, expression will evaluate to truth. + `$STAGING` value needs to a string, with length higher than zero. + Variable that contains only whitespace characters is not an empty variable. + +1. Pattern matching _(added in 11.0)_ + + > Example: `$VARIABLE =~ /^content.*/` + + It is possible perform pattern matching against a variable and regular + expression. Expression like this evaluates to truth if matches are found. + + Pattern matching is case-sensitive by default. Use `i` flag modifier, like + `/pattern/i` to make a pattern case-insensitive. + ## Debug tracing > Introduced in GitLab Runner 1.7. @@ -329,184 +647,6 @@ MIIFQzCCBCugAwIBAgIRAL/ElDjuf15xwja1ZnCocWAwDQYJKoZIhvcNAQELBQAw' ... ``` -## Using the CI variables in your job scripts - -All variables are set as environment variables in the build environment, and -they are accessible with normal methods that are used to access such variables. -In most cases `bash` or `sh` is used to execute the job script. - -To access environment variables, use the syntax for your Runner's [shell][shellexecutors]. - -| Shell | Usage | -|----------------------|-----------------| -| bash/sh | `$variable` | -| windows batch | `%variable%` | -| PowerShell | `$env:variable` | - -To access environment variables in bash, prefix the variable name with (`$`): - -```yaml -job_name: - script: - - echo $CI_JOB_ID -``` - -To access environment variables in **Windows Batch**, surround the variable -with (`%`): - -```yaml -job_name: - script: - - echo %CI_JOB_ID% -``` - -To access environment variables in a **Windows PowerShell** environment, prefix -the variable name with (`$env:`): - -```yaml -job_name: - script: - - echo $env:CI_JOB_ID -``` - -You can also list all environment variables with the `export` command, -but be aware that this will also expose the values of all the variables -you set, in the job log: - -```yaml -job_name: - script: - - export -``` - -Example values: - -```bash -export CI_JOB_ID="50" -export CI_COMMIT_SHA="1ecfd275763eff1d6b4844ea3168962458c9f27a" -export CI_COMMIT_SHORT_SHA="1ecfd275" -export CI_COMMIT_REF_NAME="master" -export CI_REPOSITORY_URL="https://gitlab-ci-token:abcde-1234ABCD5678ef@example.com/gitlab-org/gitlab-ce.git" -export CI_COMMIT_TAG="1.0.0" -export CI_JOB_NAME="spec:other" -export CI_JOB_STAGE="test" -export CI_JOB_MANUAL="true" -export CI_JOB_TRIGGERED="true" -export CI_JOB_TOKEN="abcde-1234ABCD5678ef" -export CI_PIPELINE_ID="1000" -export CI_PIPELINE_IID="10" -export CI_PAGES_DOMAIN="gitlab.io" -export CI_PAGES_URL="https://gitlab-org.gitlab.io/gitlab-ce" -export CI_PROJECT_ID="34" -export CI_PROJECT_DIR="/builds/gitlab-org/gitlab-ce" -export CI_PROJECT_NAME="gitlab-ce" -export CI_PROJECT_NAMESPACE="gitlab-org" -export CI_PROJECT_PATH="gitlab-org/gitlab-ce" -export CI_PROJECT_URL="https://example.com/gitlab-org/gitlab-ce" -export CI_REGISTRY="registry.example.com" -export CI_REGISTRY_IMAGE="registry.example.com/gitlab-org/gitlab-ce" -export CI_RUNNER_ID="10" -export CI_RUNNER_DESCRIPTION="my runner" -export CI_RUNNER_TAGS="docker, linux" -export CI_SERVER="yes" -export CI_SERVER_NAME="GitLab" -export CI_SERVER_REVISION="70606bf" -export CI_SERVER_VERSION="8.9.0" -export CI_SERVER_VERSION_MAJOR="8" -export CI_SERVER_VERSION_MINOR="9" -export CI_SERVER_VERSION_PATCH="0" -export GITLAB_USER_ID="42" -export GITLAB_USER_EMAIL="user@example.com" -export CI_REGISTRY_USER="gitlab-ci-token" -export CI_REGISTRY_PASSWORD="longalfanumstring" -``` - -## Variables expressions - -> Introduced in GitLab 10.7. - -It is possible to use variables expressions with only / except policies in -`.gitlab-ci.yml`. By using this approach you can limit what jobs are going to -be created within a pipeline after pushing a code to GitLab. - -This is particularly useful in combination with variables and triggered -pipeline variables. - -```yaml -deploy: - script: cap staging deploy - environment: staging - only: - variables: - - $RELEASE == "staging" - - $STAGING -``` - -Each expression provided is going to be evaluated before creating a pipeline. - -If any of the conditions in `variables` evaluates to truth when using `only`, -a new job is going to be created. If any of the expressions evaluates to truth -when `except` is being used, a job is not going to be created. - -This follows usual rules for [`only` / `except` policies](../yaml/README.md#onlyexcept-advanced). - -### Supported syntax - -Below you can find supported syntax reference: - -1. Equality matching using a string - - > Example: `$VARIABLE == "some value"` - - You can use equality operator `==` to compare a variable content to a - string. We support both, double quotes and single quotes to define a string - value, so both `$VARIABLE == "some value"` and `$VARIABLE == 'some value'` - are supported. `"some value" == $VARIABLE` is correct too. - -1. Checking for an undefined value - - > Example: `$VARIABLE == null` - - It sometimes happens that you want to check whether a variable is defined - or not. To do that, you can compare a variable to `null` keyword, like - `$VARIABLE == null`. This expression is going to evaluate to truth if - variable is not defined. - -1. Checking for an empty variable - - > Example: `$VARIABLE == ""` - - If you want to check whether a variable is defined, but is empty, you can - simply compare it against an empty string, like `$VAR == ''`. - -1. Comparing two variables - - > Example: `$VARIABLE_1 == $VARIABLE_2` - - It is possible to compare two variables. This is going to compare values - of these variables. - -1. Variable presence check - - > Example: `$STAGING` - - If you only want to create a job when there is some variable present, - which means that it is defined and non-empty, you can simply use - variable name as an expression, like `$STAGING`. If `$STAGING` variable - is defined, and is non empty, expression will evaluate to truth. - `$STAGING` value needs to a string, with length higher than zero. - Variable that contains only whitespace characters is not an empty variable. - -1. Pattern matching _(added in 11.0)_ - - > Example: `$VARIABLE =~ /^content.*/` - - It is possible perform pattern matching against a variable and regular - expression. Expression like this evaluates to truth if matches are found. - - Pattern matching is case-sensitive by default. Use `i` flag modifier, like - `/pattern/i` to make a pattern case-insensitive. - [ce-13784]: https://gitlab.com/gitlab-org/gitlab-ce/issues/13784 "Simple protection of CI variables" [eep]: https://about.gitlab.com/pricing/ "Available only in GitLab Premium" [envs]: ../environments.md diff --git a/doc/ci/variables/img/ci_job_stage_output_example.png b/doc/ci/variables/img/ci_job_stage_output_example.png Binary files differnew file mode 100755 index 00000000000..056238d5693 --- /dev/null +++ b/doc/ci/variables/img/ci_job_stage_output_example.png diff --git a/doc/ci/variables/img/custom_variable_output.png b/doc/ci/variables/img/custom_variable_output.png Binary files differnew file mode 100755 index 00000000000..50f3bceff9a --- /dev/null +++ b/doc/ci/variables/img/custom_variable_output.png diff --git a/doc/ci/variables/img/new_custom_variable_example.png b/doc/ci/variables/img/new_custom_variable_example.png Binary files differnew file mode 100755 index 00000000000..d169c5f1806 --- /dev/null +++ b/doc/ci/variables/img/new_custom_variable_example.png diff --git a/doc/ci/variables/img/override_value_via_manual_pipeline_output.png b/doc/ci/variables/img/override_value_via_manual_pipeline_output.png Binary files differnew file mode 100755 index 00000000000..02369d57fb8 --- /dev/null +++ b/doc/ci/variables/img/override_value_via_manual_pipeline_output.png diff --git a/doc/ci/variables/img/override_variable_manual_pipeline.png b/doc/ci/variables/img/override_variable_manual_pipeline.png Binary files differnew file mode 100755 index 00000000000..3bcd354e096 --- /dev/null +++ b/doc/ci/variables/img/override_variable_manual_pipeline.png |