debian-mirror-gitlab/doc/ci/variables/README.md

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## Variables
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When receiving a build from GitLab CI, the runner prepares the build environment.
It starts by setting a list of **predefined variables** (Environment Variables) and a list of **user-defined variables**
The variables can be overwritten. They take precedence over each other in this order:
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1. Trigger variables
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1. Secure variables
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1. YAML-defined job-level variables
1. YAML-defined global variables
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1. Predefined variables
For example, if you define:
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1. `API_TOKEN=SECURE` as Secure Variable
1. `API_TOKEN=YAML` as YAML-defined variable
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The `API_TOKEN` will take the Secure Variable value: `SECURE`.
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### Predefined variables (Environment Variables)
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| Variable | Runner | Description |
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|-------------------------|-----|--------|
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| **CI** | 0.4 | Mark that build is executed in CI environment |
| **GITLAB_CI** | all | Mark that build is executed in GitLab CI environment |
| **CI_SERVER** | all | Mark that build is executed in CI environment |
| **CI_SERVER_NAME** | all | CI server that is used to coordinate builds |
| **CI_SERVER_VERSION** | all | Not yet defined |
| **CI_SERVER_REVISION** | all | Not yet defined |
| **CI_BUILD_REF** | all | The commit revision for which project is built |
| **CI_BUILD_TAG** | 0.5 | The commit tag name. Present only when building tags. |
| **CI_BUILD_NAME** | 0.5 | The name of the build as defined in `.gitlab-ci.yml` |
| **CI_BUILD_STAGE** | 0.5 | The name of the stage as defined in `.gitlab-ci.yml` |
| **CI_BUILD_REF_NAME** | all | The branch or tag name for which project is built |
| **CI_BUILD_ID** | all | The unique id of the current build that GitLab CI uses internally |
| **CI_BUILD_REPO** | all | The URL to clone the Git repository |
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| **CI_BUILD_TRIGGERED** | 0.5 | The flag to indicate that build was [triggered] |
| **CI_BUILD_TOKEN** | 1.2 | Token used for authenticating with the GitLab Container Registry |
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| **CI_PROJECT_ID** | all | The unique id of the current project that GitLab CI uses internally |
| **CI_PROJECT_DIR** | all | The full path where the repository is cloned and where the build is ran |
**Some of the variables are only available when using runner with at least defined version.**
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Example values:
```bash
export CI_BUILD_ID="50"
export CI_BUILD_REF="1ecfd275763eff1d6b4844ea3168962458c9f27a"
export CI_BUILD_REF_NAME="master"
export CI_BUILD_REPO="https://gitlab.com/gitlab-org/gitlab-ce.git"
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export CI_BUILD_TAG="1.0.0"
export CI_BUILD_NAME="spec:other"
export CI_BUILD_STAGE="test"
export CI_BUILD_TRIGGERED="true"
export CI_BUILD_TOKEN="abcde-1234ABCD5678ef"
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export CI_PROJECT_DIR="/builds/gitlab-org/gitlab-ce"
export CI_PROJECT_ID="34"
export CI_SERVER="yes"
export CI_SERVER_NAME="GitLab CI"
export CI_SERVER_REVISION=""
export CI_SERVER_VERSION=""
```
### YAML-defined variables
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**This feature requires GitLab Runner 0.5.0 or higher and GitLab CI 7.14 or higher **
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GitLab CI allows you to add to `.gitlab-ci.yml` variables that are set in build environment.
The variables are stored in repository and are meant to store non-sensitive project configuration, ie. RAILS_ENV or DATABASE_URL.
```yaml
variables:
DATABASE_URL: "postgres://postgres@postgres/my_database"
```
These variables can be later used in all executed commands and scripts.
The YAML-defined variables are also set to all created service containers, thus allowing to fine tune them.
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Variables can be defined at a global level, but also at a job level.
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More information about Docker integration can be found in [Using Docker Images](../docker/using_docker_images.md).
### User-defined variables (Secure Variables)
**This feature requires GitLab Runner 0.4.0 or higher**
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GitLab CI allows you to define per-project **Secure Variables** that are set in
the build environment.
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The secure variables are stored out of the repository (the `.gitlab-ci.yml`).
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The variables are securely passed to GitLab Runner and are available in the
build environment.
It's desired method to use them for storing passwords, secret keys or whatever
you want.
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**The value of the variable can be shown in build log if explicitly asked to do so.**
If your project is public or internal you can make the builds private.
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Secure Variables can added by going to `Project > Variables > Add Variable`.
They will be available for all subsequent builds.
### Use variables
The variables are set as environment variables in build environment and are accessible with normal methods that are used to access such variables.
In most cases the **bash** is used to execute build script.
To access variables (predefined and user-defined) in bash environment, prefix the variable name with `$`:
```
job_name:
script:
- echo $CI_BUILD_ID
```
You can also list all environment variables with `export` command,
but be aware that this will also expose value of all **Secure Variables** in build log:
```
job_name:
script:
- export
```
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[triggered]: ../triggers/README.md