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51 lines
2.3 KiB
Markdown
51 lines
2.3 KiB
Markdown
# JQ
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## TL;DR
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```shell
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# add a field
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jq --arg REGION ${AWS_REGION} '.spec.template.spec.containers[]?.env? += [{name: "AWS_REGION", value: $REGION}]' /tmp/service.kube.json
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# delete a field
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jq 'del(.items[].spec.clusterIP)' /tmp/service.kube.json
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# update a field
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jq --arg NAMESPACE ${NAMESPACE} '.spec.template.spec.containers[]?.env[]? |= {name: .name, value: (if .name == "KUBERNETES_NAMESPACE" then $NAMESPACE else .value end)}' /tmp/service.kube.json
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# sort keys
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jq --sort-keys '.' input.json > output.json
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# put specific keys on top
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jq '.objects = [(.objects[] as $in | {type,name,id} + $in)]' prod/dataPipeline_deviceLocationConversion_prod.json
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# convert enpass' json export to yaml file
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jq '.items[] | {title, fields} | .title + ":", (.fields[] | select(.value != "") | " " + .label + ": " + .value)' test.json -cr
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# datapipeline definition refactor
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for definition_file in $(find prod -type f -name "*.json")
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do
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jq --sort-keys '.' ${definition_file} > /tmp/sorted.json
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jq '.objects = [(.objects[] as $in | {type,name,id} + $in | with_entries(select(.value != null)))]' /tmp/sorted.json > /tmp/reordered.json
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mv /tmp/reordered.json ${definition_file}
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done
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# extract data from elements with specific keys
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kubectl get pods -o yaml | yq -y '.items[] | select(.metadata.name | test("^runner-.*")) | select(.spec.tolerations[].key == "component" and .spec.tolerations[].value == "big-runner") | .spec.nodeSelector, .spec.tolerations' -
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# recursively find all the properties whose key is 'errors' whether it exists or not
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# '..' unrolls the object, '?' checks for the value or returns null, and 'select(.)' is like a filter on truthy values
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jq '[.. | .errors?[0] | select(.) ]' /tmp/helm.template.out.json
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# find all images in a helm chart explicitly or implicitly using the tag 'latest'
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helm template ${CHART} | yq -r '.. | .image? | select(.) | select(.|test(".*:.*")|not), select(.|test(".*:$")), select(.|test(".*:latest"))' -
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## Further readings
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- [Filter objects list with regex]
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- [Select multiple conditions]
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- [JQ recipes]
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[filter objects list with regex]: https://til.hashrocket.com/posts/uv0bjiokwk-use-jq-to-filter-objects-list-with-regex
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[jq recipes]: https://remysharp.com/drafts/jq-recipes
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[select multiple conditions]: https://stackoverflow.com/questions/33057420/jq-select-multiple-conditions#33059058
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