Using yq in for loop bash

Question

I have a yaml array like below,

identitymappings:
- arn: "arn:aws:iam::12345567:role/AdmRole"
  group: "system:masters"
  user: "user1"
- arn: "arn:aws:iam::12345567:role/TestRole"
  group: "system:masters"
  user: "user2"

I am trying to parse this yaml in a bash script using for loop and yq.

 for identityMapping in $(yq read test.yaml "identitymappings[*]"); do
      roleArn=$identityMapping["arn"]
      group=$identityMapping.group
      user=$identityMapping.user
done

But I am not getting the expected results like not able to fetch the values of roleArn,group,user. Please let me know how to fix this.

Answer 1

The way I would do it is:

# load array into a bash array
# need to output each entry as a single line
readarray identityMappings < <(yq e -o=j -I=0 '.identitymappings[]' test.yml )

for identityMapping in "${identityMappings[@]}"; do
    # identity mapping is a yaml snippet representing a single entry
    roleArn=$(echo "$identityMapping" | yq e '.arn' -)
    echo "roleArn: $roleArn"
done

output:

roleArn: arn:aws:iam::12345567:role/AdmRole
roleArn: arn:aws:iam::12345567:role/TestRole

Disclaimer: I wrote yq