swarm-gitops/variable-handler.sh

#!/bin/bash

PROJECT_NAME=${1:?Project name missing}
shift
SERVICE_NAME=${1:?Service name missing}
shift
FILE_NAME=${1:?File name missing}
shift
VARIABLE_TYPE=${1:?Variable type missing (config or secret)}
shift
ITERATOR_TYPE=${1:?Iterator missing (version or hash)}
shift

case "$VARIABLE_TYPE" in
    "config"|"secret")
        ;;
    *)
        echo "Invalid variable type"
        exit 1
esac

LOCAL_FNAME=${PROJECT_NAME}/files/${SERVICE_NAME}/${FILE_NAME}

function get_variable {
    # find latest
    if [ "$ITERATOR_TYPE" = "version" ]; then
        RETVAL=$(docker $VARIABLE_TYPE ls \
                --filter label=org.sysdeploy.project=${PROJECT_NAME} \
                --filter label=org.sysdeploy.service=${SERVICE_NAME} \
                --filter label=org.sysdeploy.file=${FILE_NAME} \
                --format '{{.Label "org.sysdeploy.version"}} {{.Name}}' \
                | sort -rn | head -1)
        ITERATOR=$(echo "$RETVAL" | cut -d\  -f1)
        OBJECT_NAME=$(echo "$RETVAL" | cut -d\  -f2-)
    elif [ "$ITERATOR_TYPE" = "hash" ]; then
        if [ ! -f "$LOCAL_FNAME" ]; then
            echo "Can't find $LOCAL_FNAME"
            exit 1
        fi
        NEW_HASH=$(git log -n 1 --format='format:%H' -- "$LOCAL_FNAME")
        ITERATOR="$NEW_HASH"
        OBJECT_NAME=$(docker $VARIABLE_TYPE ls \
                --filter label=org.sysdeploy.project=${PROJECT_NAME} \
                --filter label=org.sysdeploy.service=${SERVICE_NAME} \
                --filter label=org.sysdeploy.file=${FILE_NAME} \
                --filter label=org.sysdeploy.hash=${ITERATOR} \
                --format '{{.Name}}' \
                | head -1)
    fi
}

function get_content {
    local OBJECT_NAME="$1"
    shift
    docker config inspect "$OBJECT_NAME" |jq -r \
           '.[0].Spec.Data'|base64 --decode
}

function set_variable {
    NEW_NAME=$(uuidgen)

    if [ "$ITERATOR_TYPE" = "version" ]; then
        ((ITERATOR++))
        docker $VARIABLE_TYPE create \
            --label=org.sysdeploy.project=${PROJECT_NAME} \
            --label=org.sysdeploy.service=${SERVICE_NAME} \
            --label=org.sysdeploy.file=${FILE_NAME} \
            --label=org.sysdeploy.version=${ITERATOR} \
            "$NEW_NAME" "$LOCAL_FNAME"
    elif [ "$ITERATOR_TYPE" = "hash" ]; then
        docker $VARIABLE_TYPE create \
            --label=org.sysdeploy.project=${PROJECT_NAME} \
            --label=org.sysdeploy.service=${SERVICE_NAME} \
            --label=org.sysdeploy.file=${FILE_NAME} \
            --label=org.sysdeploy.hash=${ITERATOR} \
            "$NEW_NAME" "$LOCAL_FNAME"
    fi
}

get_variable

if [ -n "$OBJECT_NAME" ]; then
    echo "Name: $OBJECT_NAME"
    echo "Version/hash: $ITERATOR"
else
    echo "Can't find any such $VARIABLE_TYPE"
fi

# set
if [ -n "$1" ]; then
    set_variable
    echo "New name: $NEW_NAME, $ITERATOR_TYPE: $ITERATOR"
fi

# docker config ls \
#        --filter label=org.sysdeploy.file=/etc/collectd/collectd.conf.d/thresholds.conf \
#        --format '{{.Label "org.sysdeploy.version"}} {{.ID}}'|sort -rn

# Create or rotate
#
# get current
# optional compare
# create a new one
# update references if needed
#
# create a config:
# docker config create \
#        --label org.sysdeploy.project=monitoring \
#        --label org.sysdeploy.file=/etc/collectd/collectd.conf.d/thresholds.conf \
#        --label org.sysdeploy.service=collectd \
#        --label org.sysdeploy.version=11 \
#        $(uuidgen) thresholds.conf
#
# retrieving config label:
# docker config inspect \
#       -f '{{index .Spec.Labels "org.sysdeploy.file"}}' \
#       6fe6qfmjjg606h138nxkbzjyw
#
# finding configs by label matching and reverse order by version
# docker config ls \
#        --filter label=org.sysdeploy.file=/etc/collectd/collectd.conf.d/thresholds.conf \
#        --format '{{.Label "org.sysdeploy.version"}} {{.ID}}'|sort -rn
#
# labels:
# org.sysdeploy.file = filename inside the container
# org.sysdeploy.version = if versioning incrementally, version is stored
# here
# org.sysdeploy.commit = if versioning by commit, commit is stored here
# org.sysdeploy.service = compose/stack service, not sure this is needed
# org.sysdeploy.project = $COMPOSE_PROJECT_NAME
#
# find the last commit a file was changed:
# git log -n 1 --format='format:%H' -- monitoring/docker-compose.yml