CODEWITHSUNDEEP
powershellaws-cli
Luis
Luis

Reputation: 373

Try/Catch aws cli errors in powershell script

I'm trying to have a script automatically create ECR repos for projects as part of the pipeline. I want to check if it already exists first, however describe-repositories returns an error instead of "nothing", and it's not caught in a try/catch .

try{
    $ErrorActionPreference = "Stop"
    aws ecr describe-repositories --repository-names "some-project"
}
catch {
    aws ecr create-repository --repository-name "some-project"    
}

Output:

An error occurred (RepositoryNotFoundException) when calling the DescribeRepositories operation: The repository with name '...' does not exist in the registry with id '...'

Is there a way to capture the error? Edit: Setting $ErrorActionPreference = "Stop" doesn't change behaviour.

Upvotes: 5

Views: 4101

Answers (1)

G42
G42

Reputation: 10019

You should be able to leverage $LastExitCode to tell that an error has occurred (Some minimal AWS CLI documentation on this)

aws ecr describe-repositories --repository-names "some-project"

if ($LastExitCode) {
    aws ecr create-repository --repository-name "some-project"
}

If you want the actual error message, you should be able to leverage redirection as described in How to capture error messages thrown by a command?

Really though I think there are two other improvements you can do here:

  • Instead of describing a specific repository, list them and see if the one you want exists:
$repositories = (aws ecr describe-repositories) | ConvertFrom-Json

if ("some-project" -notin $repositories.repositories.repositoryName) {
    aws ecr create-repository --repository-name "some-project"
}

Upvotes: 4

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