A shell script to parse the JSON output of `rover subgraph check` or `rover graph check`

rover_check_markdown.sh

#!/usr/bin/env sh
set -euo pipefail
# This script performs a subgraph check and generates a markdown file from Rover's JSON output

# Change the following line to refer to your graph ref, schema, and subgraph name
CHECK_OUTPUT=$(rover subgraph check my-graph --schema ./products.graphql --name products --output json) || true

CHECK_SUCCESS=$(echo $CHECK_OUTPUT | jq '.data.success')

if [ $CHECK_SUCCESS = "true" ]; then
  echo "### $ENVIRONMENT Check Success"
  echo ""
  echo "#### Change Details"
  echo ""
fi

CHANGES=$(echo "${CHECK_OUTPUT}" | jq '.data.changes')
if [ "$CHANGES" != "null" ]; then
    CHANGE_SIZE=$(echo "${CHECK_OUTPUT}" | jq -r '.data.changes | length')
    if [ "$CHANGE_SIZE" = "0" ]; then
        echo "No changes"
    fi

    if [ "$CHANGE_SIZE" != "0" ]; then
        echo "| Severity | Code | Description |"
        echo "| -------- | ---- | ----------- |"

        for CHANGE in $(echo "${CHECK_OUTPUT}" | jq -r '.data.changes[] | @base64'); do
            _jq() {
              echo ${CHANGE} | base64 -d | jq -r ${1}
            }

            CHANGE_SEVERITY=$(_jq '.severity')
            CHANGE_CODE=$(_jq '.code')
            CHANGE_DESCRIPTION=$(_jq '.description')
            echo "| $CHANGE_SEVERITY | $CHANGE_CODE | $CHANGE_DESCRIPTION |"
        done
    fi
  echo ""
fi

if [ $CHECK_SUCCESS = "false" ]; then
  echo "### $ENVIRONMENT Check Failure"
  echo ""
  echo $CHECK_OUTPUT | jq -r '.error.message'
  echo ""
  echo "#### Error Details"
  echo ""
  for BUILD_ERROR in $(echo "${CHECK_OUTPUT}" | jq -r '.error.details.build_errors[] | @base64'); do
    _jq() {
      echo ${BUILD_ERROR} | base64 -d | jq -r ${1}
    }
    BUILD_ERROR_CODE=$(_jq '.code')
    if [ $BUILD_ERROR_CODE != "null" ]; then
      echo "$BUILD_ERROR_CODE: $(_jq '.message')"
    else
      echo "UNKNOWN: $(_jq '.message')"
    fi
    exit 1
  done
fi
echo ""