Commit 537d69a2 authored by Brian Long's avatar Brian Long
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initial checkin

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.gitignore

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# Maven

target

pom.xml.versionsBackup



# Eclipse

.project

.settings

Containerfile

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FROM ${os.image.prefix}${os.image.name}:${os.image.version}${os.image.suffix}



ENV SKIP_ENTRYPOINT_SCRIPTS=false

ENV VERBOSE=true



# these are effectively immutable; provided to be used by extending images

# the entrypoint will re-set these in case they are changed

ENV CONTAINERD_ENTRYPOINT_PATH="${image.containerd.directory}"

ENV CACERT_INSTALL_PATH="/usr/local/share/ca-certificates"



# Install curl & essentials

RUN apt update && \

        apt -y install curl



# Add our Docker container initialization scripts

ADD --chmod=755 maven/entrypoint.sh ${image.containerd.directory}/entrypoint.sh

# RUN chmod 755 ${image.containerd.directory}/entrypoint.sh



# Execute the Docker container initialization script

ENTRYPOINT [ "${image.containerd.directory}/entrypoint.sh" ]

README.md

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# Base Image



This project creates a container image that provides purpose agnostic functionality to all extending images.



## Features



### Tools



The following tools are available.



- `curl`



### Extensible `ENTRYPOINT`



This image provides an entrypoint script that executes other entrypoint scripts, before executing the `CMD` (if provided).  It will execute any executable `.sh` scripts added to the path described by the `CONTAINERD_ENTRYPOINT_PATH` environment variable.  It will execute them in default sort order, so the use of numerical prefixes (`00_first.sh` or `99_last.sh`) may be wise.



### Extensible Certificate Authority



This image detects files in the path described by the `CACERT_INSTALL_PATH` environment variable.  If a file is found, it will treat it as a certificate and add it to the trusted certificates in all supported contexts.



## Configuration



### Environment Variables



| Name                         | Default         | Mutable |

| ---------------------------- | --------------- |:-------:|

| `SKIP_ENTRYPOINT_SCRIPTS`    | `false`         | Yes     |

| `VERBOSE`                    | `true`          | Yes     |

| `CONTAINERD_ENTRYPOINT_PATH` | *not important* | No      |

| `CACERT_INSTALL_PATH`        | *not important* | No      |

pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">



	<modelVersion>4.0.0</modelVersion>

	<groupId>com.inteligr8.container</groupId>

	<artifactId>base</artifactId>

	<version>${base.version}-${os.image.name}-${os.image.version}</version>

	<name>Base Image</name>

	<description>This is a purpose-agnostic base image</description>

	<packaging>pom</packaging>



	<properties>

		<base.version>1.0</base.version>



		<!-- The release version of Debian Linux to use as the base -->

		<!-- See: https://hub.docker.com/_/debian -->

		<os.image.prefix></os.image.prefix>

		<os.image.name>debian</os.image.name>

		<os.image.version>12.14</os.image.version>

		<os.image.suffix>-slim</os.image.suffix>



		<!-- The Docker image meta-data for pushing the build -->

		<image.name>inteligr8/${project.artifactId}</image.name>

		<image.tag>${project.version}</image.tag>

		<image.registry>docker.inteligr8.com</image.registry>



		<!-- using version properties so they can be overridden by child projects or Maven executions -->

		<kubernetes-maven-plugin.version>1.19.0</kubernetes-maven-plugin.version>

		<regex-maven-plugin.version>1.0.7</regex-maven-plugin.version>



		<!-- these properties are only used in the container -->

		<image.containerd.directory>/opt/inteligr8/containerd</image.containerd.directory>

	</properties>



	<build>

		<resources>

			<resource>

				<directory>src/main/containerd</directory>

				<filtering>true</filtering>

				<targetPath>${project.build.directory}/resources</targetPath>

			</resource>

		</resources>

		<pluginManagement>

			<plugins>

				<plugin>

					<groupId>org.eclipse.jkube</groupId>

					<artifactId>kubernetes-maven-plugin</artifactId>

					<version>${kubernetes-maven-plugin.version}</version>

				</plugin>

				<plugin>

					<groupId>com.inteligr8</groupId>

					<artifactId>regex-maven-plugin</artifactId>

					<version>${regex-maven-plugin.version}</version>

				</plugin>

			</plugins>

		</pluginManagement>

		<plugins>

			<plugin>

				<groupId>com.inteligr8</groupId>

				<artifactId>regex-maven-plugin</artifactId>

				<executions>

					<execution>

						<id>determine-os-image-short-name</id>

						<phase>validate</phase>

						<goals>

							<goal>replace-property</goal>

						</goals>

						<configuration>

							<property>os.image.name</property>

							<newProperty>os.image.shortName</newProperty>

							<regexes>

								<regex>

									<pattern>(.{3}).+</pattern>

									<replacement>$1</replacement>

								</regex>

							</regexes>

						</configuration>

					</execution>

					<execution>

						<id>determine-os-image-major-version</id>

						<phase>validate</phase>

						<goals>

							<goal>replace-property</goal>

						</goals>

						<configuration>

							<property>os.image.version</property>

							<newProperty>os.image.majorVersion</newProperty>

							<regexes>

								<regex>

									<pattern>([^.]+).*</pattern>

									<replacement>$1</replacement>

								</regex>

							</regexes>

						</configuration>

					</execution>

				</executions>

			</plugin>

			<plugin>

				<artifactId>maven-resources-plugin</artifactId>

				<executions>

					<execution>

						<id>copy-resources</id>

						<phase>process-resources</phase>

						<goals><goal>resources</goal></goals>

						<configuration>

							<encoding>utf-8</encoding>

							<propertiesEncoding>utf-8</propertiesEncoding>

						</configuration>

					</execution>

				</executions>

			</plugin>

			<!-- This plugin build and pushes the Docker image -->

			<plugin>

				<groupId>org.eclipse.jkube</groupId>

				<artifactId>kubernetes-maven-plugin</artifactId>

				<configuration>

					<images>

						<image>

							<name>${image.name}:${image.tag}</name>

							<registry>${image.registry}</registry>

							<build>

								<contextDir>${project.build.directory}/resources</contextDir>

								<dockerFile>${project.basedir}/Containerfile</dockerFile>

								<tags>

									<tag>${base.version}-${os.image.shortName}${os.image.majorVersion}</tag>

								</tags>

							</build>

						</image>

					</images>

					<verbose>true</verbose>

				</configuration>

				<executions>

					<!-- This execution builds the Docker image -->

					<execution>

						<id>docker-build</id>

						<phase>package</phase>

						<goals><goal>build</goal></goals>

					</execution>

					<!-- This execution pushes the built Docker image to the configured Docker Registry -->

					<execution>

						<id>docker-push</id>

						<phase>deploy</phase>

						<goals><goal>push</goal></goals>

					</execution>

				</executions>

			</plugin>

			<!-- This plugin prevents the project from deploying to the Maven Repository, as it is pointless -->

			<plugin>

				<artifactId>maven-deploy-plugin</artifactId>

				<configuration>

					<skip>true</skip>

				</configuration>

			</plugin>

		</plugins>

	</build>



	<profiles>

		<profile>

			<id>no-docker</id>

			<properties>

				<jkube.build.strategy>jib</jkube.build.strategy>

			</properties>

		</profile>

	</profiles>

	

</project>

src/main/containerd/entrypoint.sh

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#!/bin/bash



function ifecho() {

    if [[ ${VERBOSE} == "true" ]]; then

        echo "$1"

    fi

}



# error on any non-zero exit code

set -e



# setting environment variables here so they cannot be overridden

export CONTAINERD_ENTRYPOINT_PATH="${image.containerd.directory}"

export CACERT_INSTALL_PATH="/usr/local/share/ca-certificates"



if [[ ${SKIP_ENTRYPOINT_SCRIPTS} == "true" ]]; then

    ifecho "Skipping entrypoint executions ..."

else

    # execute all scripts

    CONTAINERD_FILES=( ${CONTAINERD_ENTRYPOINT_PATH}/*.sh )

    if (( ${#CONTAINERD_FILES[@]} > 1 )); then

        for (( CONTAINERD_FILEINDEX = 0; CONTAINERD_FILEINDEX < ${#CONTAINERD_FILES[@]}; CONTAINERD_FILEINDEX++ )); do

            CONTAINERD_FILE=${CONTAINERD_FILES[$CONTAINERD_FILEINDEX]}

            if [[ ${CONTAINERD_FILE} != "${CONTAINERD_ENTRYPOINT_PATH}/entrypoint.sh" ]]; then

                ifecho "Executing entrypoint: ${CONTAINERD_FILE}"

                . ${CONTAINERD_FILE}

            fi

        done

    fi

fi



if ! find ${CACERT_INSTALL_PATH}/ -maxdepth 0 -empty | read JUNK; then

    # update cacerts with any custom certs in /usr/local/share/ca-certificates

    ifecho "Updating CA certificates ..."

    update-ca-certificates

fi



if [[ ! -z $1 ]]; then

    ifecho "Executing command ..."

    exec "$@"

fi