Variable interpolation in options:env: not working

[ryanchapman]

Hi,

I'm trying to specify environment variables for the whole build instead of for each build step, like so:

steps:
- id: 'echo_env_vars'
  name: 'gcr.io/cloud-builders/git'
  entrypoint: '/bin/bash'
  args: ["-c", "env"]

- id: 'build_docker_image'
  name: 'gcr.io/cloud-builders/docker'
  waitFor: ['build_number']
  entrypoint: '/bin/bash'
  args: ["-c", "./make.bash all ${REPO_NAME}"]

options:
 env:
  - 'BUILD_ID=$BUILD_ID'
  - 'BRANCH_NAME=$BRANCH_NAME'
  - 'TAG_NAME=$TAG_NAME'
  - 'REPO_NAME=$REPO_NAME'
  - 'REVISION_ID=$REVISION_ID'
  - 'PROJECT_ID=$PROJECT_ID'
  - 'SHORT_SHA=$SHORT_SHA'

But variables are not interpolated, so in the 'echo_env_vars' step, my environment looks like this:

Already have image (with digest): gcr.io/cloud-builders/git
HOSTNAME=a3319a25f68f
BUILD_ID=$BUILD_ID
BRANCH_NAME=$BRANCH_NAME
SHORT_SHA=$SHORT_SHA
PATH=/builder/google-cloud-sdk/bin/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/builder/google-cloud-sdk/bin/
PWD=/workspace
PROJECT_ID=$PROJECT_ID
REPO_NAME=$REPO_NAME
SHLVL=1
HOME=/builder/home
REVISION_ID=$REVISION_ID
DEBIAN_FRONTEND=noninteractive
BUILDER_OUTPUT=/builder/outputs
TAG_NAME=$TAG_NAME
_=/usr/bin/env

If I put the vars in for each build step, like so:

steps:
- id: 'echo_env_vars'
  name: 'gcr.io/cloud-builders/git'
  entrypoint: '/bin/bash'
  args: ["-c", "env"]
  env:
    - 'BUILD_ID=$BUILD_ID'
    - 'BRANCH_NAME=$BRANCH_NAME'
    - 'TAG_NAME=$TAG_NAME'
    - 'REPO_NAME=$REPO_NAME'
    - 'REVISION_ID=$REVISION_ID'
    - 'PROJECT_ID=$PROJECT_ID'
    - 'SHORT_SHA=$SHORT_SHA'

- id: 'build_docker_image'
  name: 'gcr.io/cloud-builders/docker'
  waitFor: ['build_number']
  entrypoint: '/bin/bash'
  args: ["-c", "./make.bash all ${REPO_NAME}"]
  env:
    - 'BUILD_ID=$BUILD_ID'
    - 'BRANCH_NAME=$BRANCH_NAME'
    - 'TAG_NAME=$TAG_NAME'
    - 'REPO_NAME=$REPO_NAME'
    - 'REVISION_ID=$REVISION_ID'
    - 'PROJECT_ID=$PROJECT_ID'
    - 'SHORT_SHA=$SHORT_SHA'

Then the variables are interpolated.

Already have image (with digest): gcr.io/cloud-builders/git
HOSTNAME=99ca06779b08
BRANCH_NAME=ryan/push-on-merge2
SHORT_SHA=341bb94
PATH=/builder/google-cloud-sdk/bin/:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/builder/google-cloud-sdk/bin/
PWD=/workspace
PROJECT_ID=ci
REPO_NAME=assetserver
BUILD_ID=bd63276b-2201-4525-be2c-33aa7f1a87e9
SHLVL=1
HOME=/builder/home
REVISION_ID=341bb944b371fc5602e4d961912939fd876f09f3
DEBIAN_FRONTEND=noninteractive
BUILDER_OUTPUT=/builder/outputs
TAG_NAME=
_=/usr/bin/env

Unfortunately, specifying env variables multiple times in each build step is error prone. I'd like a way to do it once and for it to apply to all steps.

[ryanchapman]

Wanted to add that I reported this internally and I think it was fixed in the cloud version.

The internal bug number for that I'm told was 122901552.

[codrienne]

In both the hosted service and local binary, you can now specify global env vars in the build.options. Information is in the REST API documentation: https://cloud.google.com/cloud-build/docs/api/reference/rest/Shared.Types/Build#BuildOptions

I've ping'd appropriate channels to get documentation coverage in our main tutorial pages. Thanks for following up!