keg

#!/bin/bash

if [ "$#" -lt 2 ]; then
    echo "Usage: keg [-s] name file [file ...]"
    exit 1;
fi

put() {
    if [ "$#" != 2 ]; then exit 1; fi
    key=$1; value=`echo $2 | sed -e "s/ /:SP:/g"`
    envmap="`echo "$envmap" | sed -e "s/--$key=[^ ]*//g"` --$key=$value"
}

get() {
    key=$1
    value="$(echo $envmap |sed -e "s/.*--${key}=\([^ ]*\).*/\1/" -e 's/:SP:/ /g' )"
}

keys() {
    keys=`echo $envmap | sed -e "s/=[^ ]*//g" -e "s/\([ ]*\)--/\1/g"`
}

secret=false
if [ "$1" = "-s" ]; then
    secret=true
    shift
fi

name=$1
shift

# read env key values from file(s) into map
while [ "$1" != "" ]; do
    while IFS='' read -r line || [[ -n "$line" ]]; do
        if [[ $line == *"="* ]] && [[ $line != *"#"* ]]
        then
            IFS='=' read -r k v <<< "$line"
            put "${k}" "${v}"
        fi
    done < "$1"
    shift
done

keys

if [ "$secret" = true ] ; then
    # generates secret yaml
    fileout="${name}.yaml"
    echo ""
    echo "apiVersion: v1" | tee ${fileout}
    echo "kind: Secret" | tee -a ${fileout}
    echo "metadata:" | tee -a ${fileout}
    echo "  name: $name" | tee -a ${fileout}
    echo "type: Opaque" | tee -a ${fileout}
    echo "data:" | tee -a ${fileout}
    for key in ${keys}
    do
        echo -n "  ${key//_/-}: " | tr '[:upper:]' '[:lower:]' | tee -a ${fileout}
        get ${key}
        echo -n "${value}" | base64 | tee -a ${fileout}
    done
else
    # generates a configmap command
    fileout="create-configmap-${name}.sh"
    echo "#!/bin/sh" > ${fileout}
    chmod +x ${fileout}
    echo ""
    echo -n "kubectl create configmap $name" | tee -a ${fileout}
    for key in ${keys}
    do
        echo -n " --from-literal=" | tee -a ${fileout}
        echo -n "${key//_/-}" | tr '[:upper:]' '[:lower:]' | tee -a ${fileout}
        get ${key}
        echo -n "=\"${value}\"" | tee -a ${fileout}
    done
    echo "" | tee -a ${fileout}

fi

echo ""
echo "Created ${fileout}"
echo ""

# generates environment snippet to paste into deployment yaml
fileout="env-snippet-${name}.yaml"
echo "        env:" | tee ${fileout}
for key in ${keys}
do
    echo "          - name: ${key}" | tee -a ${fileout}
    echo "            valueFrom:" | tee -a ${fileout}
    if [ "$secret" = true ] ; then
        echo "              secretKeyRef:" | tee -a ${fileout}
    else
        echo "              configMapKeyRef:" | tee -a ${fileout}
    fi
    echo "                name: $name" | tee -a ${fileout}
    echo "                key: ${key//_/-}" | tr '[:upper:]' '[:lower:]' | tee -a ${fileout}
done
echo ""
echo "Created ${fileout}"
echo ""