GitLab CI任务依赖工件但不依赖执行结果的实现问题

问题场景 #

需要配置三个GitLab CI任务：

• 任务A：始终执行成功，产出artifacts
• 任务B：始终执行失败，但需产出artifacts
• 任务C：需获取A、B的artifacts，且必须等A、B无论成败完成后再执行

但GitLab CI默认的needs或dependencies仅依赖任务成功才会触发/获取artifacts，导致C无法执行。

解决方案 #

核心思路是让失败的任务B不阻断流水线，同时确保其失败时仍能产出artifacts，具体通过两个关键配置实现：

• allow_failure: true：标记任务失败不影响流水线整体进度
• artifacts: when: always：无论任务成败都生成并保存artifacts

同一阶段配置示例 #

stages:
  - build
  - test

build_job:
  stage: build
  script:
    - echo building...

test_job_A:
  needs:
    - build_job
  stage: test
  script:
    - echo "logs of tests executed in A" > test_result_A.txt
  artifacts:
    paths:
      - test_result_A.txt

test_job_B:
  needs:
    - build_job
  stage: test
  script:
    - echo "logs of tests executed in B" > test_result_B.txt
    - exit 1 # 模拟任务失败
  allow_failure: true # 允许任务失败，不阻断后续任务
  artifacts:
    paths:
      - test_result_B.txt
    when: always # 无论成败都产出artifacts

coverage_C:
  needs:
    - test_job_A
    - test_job_B
  stage: test
  script:
    - cat test_result_A.txt
    - cat test_result_B.txt
  when: always # 可选：确保C一定会执行，不受A/B状态影响

独立阶段配置示例 #

如果需要把C放在单独阶段，同样适用上述配置：

stages:
  - build
  - test
  - coverage

build_job:
  stage: build
  script:
    - echo building...

test_job_A:
  needs:
    - build_job
  stage: test
  script:
    - echo "logs of tests executed in A" > test_result_A.txt
  artifacts:
    paths:
      - test_result_A.txt

test_job_B:
  needs:
    - build_job
  stage: test
  script:
    - echo "logs of tests executed in B" > test_result_B.txt
    - exit 1
  allow_failure: true
  artifacts:
    paths:
      - test_result_B.txt
    when: always

coverage_C:
  stage: coverage
  dependencies:
    - test_job_A
    - test_job_B
  script:
    - cat test_result_A.txt
    - cat test_result_B.txt

关键配置说明 #

1. allow_failure: true：作用于任务B，告诉GitLab CI该任务的失败不会导致流水线终止，后续任务可以正常触发。
2. artifacts: when: always：作用于任务B，确保即使任务执行失败，其生成的artifacts依然会被上传保存，这样任务C才能获取到对应的文件。
3. 任务C的触发条件：因为任务B被标记为允许失败，GitLab CI会将其视为"完成状态"，因此needs或dependencies都能正常识别依赖已完成，任务C会在A、B都结束后执行。

内容的提问来源于stack exchange，提问作者Michael1248