`devcontainer features test` and capturing errors during build

[natescherer]

Hello! I'm having difficulty figuring out how devcontainer features test can capture errors that occur as part of the build. I'm working on a feature that will installed PowerShell resources, which has an obvious dependency on pwsh being installed.

I have this in the install.sh:

if command -v pwsh > /dev/null; then
    echo "Confirmed PowerShell is installed"
else
    echo "PowerShell is not installed. Please ensure it is installed before using this feature."
    exit 127
fi

This causes an error during the container build (good), but I can't figure out a way to capture it via the test suite. (Not 100% sure it's even possible, since the build is erroring out).

#13 [dev_containers_target_stage 3/3] RUN cd /tmp/build-features/powershell-resource_1 && chmod +x ./devcontainer-features-install.sh && ./devcontainer-features-install.sh

[11807 ms] #13 0.231 ===========================================================================
#13 0.231 Feature       : ./powershell-resource
#13 0.231 Description   : A feature to install PowerShell resources (modules and scripts) via PowerShellGet 3.0 Prerelease for all users on a devcontainer.
#13 0.231 Id            : Unknown
#13 0.231 Version       : 0.1.0
#13 0.231 Documentation : 
#13 0.231 Options       :
#13 0.231 
#13 0.231 ===========================================================================
#13 0.234 Feature 'powershell-resource' starting...
#13 0.234 PowerShell is not installed. Please ensure it is installed before using this feature.
#13 0.234 ERROR: Feature "./powershell-resource" (Unknown) failed to install!
#13 ERROR: executor failed running [/bin/sh -c cd /tmp/build-features/powershell-resource_1 && chmod +x ./devcontainer-features-install.sh && ./devcontainer-features-install.sh]: exit code: 127
------
 > [dev_containers_target_stage 3/3] RUN cd /tmp/build-features/powershell-resource_1 && chmod +x ./devcontainer-features-install.sh && ./devcontainer-features-install.sh:
#13 0.231 Description   : A feature to install PowerShell resources (modules and scripts) via PowerShellGet 3.0 Prerelease for all users on a devcontainer.
#13 0.231 Id            : Unknown
#13 0.231 Version       : 0.1.0
#13 0.231 Documentation : 
#13 0.231 Options       :
#13 0.231 
#13 0.231 ===========================================================================
#13 0.234 Feature 'powershell-resource' starting...
#13 0.234 PowerShell is not installed. Please ensure it is installed before using this feature.
#13 0.234 ERROR: Feature "./powershell-resource" (Unknown) failed to install!
------
ERROR: failed to solve: executor failed running [/bin/sh -c cd /tmp/build-features/powershell-resource_1 && chmod +x ./devcontainer-features-install.sh && ./devcontainer-features-install.sh]: exit code: 127

[11814 ms] Exit code 1
[-] Failed to launch container:

Command failed: docker buildx build --load --build-context dev_containers_feature_content_source=/tmp/devcontainercli-runner/container-features/0.21.0-1666128532008 --build-arg _DEV_CONTAINERS_BASE_IMAGE=mcr.microsoft.com/devcontainers/base:ubuntu --build-arg _DEV_CONTAINERS_IMAGE_USER=root --build-arg _DEV_CONTAINERS_FEATURE_CONTENT_SOURCE=dev_container_feature_content_temp --target dev_containers_target_stage -t vsc-1666128531151-605d92cc5d16be5d5f0e80c97ea3221f-features -f /tmp/devcontainercli-runner/container-features/0.21.0-1666128532008/Dockerfile.extended /tmp/devcontainercli-runner/empty-folder
Error: Process completed with exit code 1.

Could someone please confirm if this is possible with the current state of the test suite or if this is a feature that will need to be added? Thanks!

[AlexanderLanin]

Is this a variation of #215 + the ability to have "expect fail"?

[natescherer]

Yes, I'd say that's accurate!