mender-inventory-intervals

#!/bin/sh

json_file="/etc/mender/mender.conf"

if [ ! -f "$json_file" ]; then
    echo "File not found: $json_file" >&2
    exit 1
fi

to_kebab_case() {
    string="$1"
    # Remove the word "interval"
    string=$(echo "$string" | sed 's/Interval//g')
    # Replace capital letters with hyphen-lowercase
    string=$(echo "$string" | sed 's/\([A-Z]\)/-\1/g')
    # Convert to lowercase
    string=$(echo "$string" | tr '[:upper:]' '[:lower:]')
    # Preppend the "interval" word
    string=$(echo "$string" | sed -E 's/^/interval/g')
    echo "$string"
}

extract_and_print() {
    key="$1"
    line="$2"
    if echo "$line" | grep -q "\"$key\""; then
        value=$(echo "$line" | sed -E 's/.*"'$key'":\s*([^,}]+).*/\1/')
        value=$(echo "$value" | sed -E 's/^"|"$//g')
        key=$(to_kebab_case  "$key")
        printf "%s=%s\n" "$key" "$value"
    fi
}

# Read the JSON file line by line
while IFS= read -r line; do

    # Extract and print InventoryPollIntervalSeconds
    extract_and_print "InventoryPollIntervalSeconds" "$line"
    # Extract and print RetryPollIntervalSeconds
    extract_and_print "RetryPollIntervalSeconds" "$line"
    # Extract and print UpdatePollIntervalSeconds
    extract_and_print "UpdatePollIntervalSeconds" "$line"
    # Extract and print RetryPollCount
    extract_and_print "RetryPollCount" "$line"

done < "$json_file"