Script to increment, build and push an image version from Dockerhub.

build_and_publish_docker.sh

#!/bin/bash

# Script to increment, build and push an image version from Dockerhub.
# Copyright (C) 2019 Pierre Cavin (tech@sherlox.io)
# Permission to copy and modify is granted under the MIT License.

#################################################################################
# WARNING: You must use versions like "MAJOR.MINOR.PATCH" with digits only.
# Pre-release and build metadata labels are not supported (contribs are welcome).
#################################################################################

#######################
# FILL ME
#######################
DOCKERHUB_REPOSITORY=""
#######################

if [ -z "$DOCKERHUB_REPOSITORY" ]; then
  printf "Before using this script you need to edit line 8 and fill the value with your Dockerhub repository.\n"
  printf "Then put this script as 'publish.sh' alongside your Dockerfile.\n\n"
  exit 1
fi

if [ -z "$1" ] || [[ "$1" =~ ^(-h|--help)$ ]] || [[ ! "$1" =~ ^(major|minor|patch)$ ]]; then
  printf "Pass a release type to increment the version, build and push this image.\n"
  printf "Usage: ./publish.sh [major, minor, patch]\n\n"
  exit 0
fi

RELEASE_TYPE=$1

# Fetch latest tag matching /^[0-9]+\.[0-9]+\.[0-9]+$/
CURRENT_VER=$(wget -q https://registry.hub.docker.com/v1/repositories/$DOCKERHUB_REPOSITORY/tags -O -  | sed -e 's/[][]//g' -e 's/"//g' -e 's/ //g' | tr '}' '\n'  | awk -F: '{print $3}' | awk '/^[0-9]+\.[0-9]+\.[0-9]+$/{ print $0 }' | awk -F: 'END{print $0}')

# Decompose the version string
CURRENT_VER_ARR=(${CURRENT_VER//./ }) # Replaces dots with spaces then convert to array
CURRENT_VER_MAJOR=${CURRENT_VER_ARR[0]}
CURRENT_VER_MINOR=${CURRENT_VER_ARR[1]}
CURRENT_VER_PATCH=${CURRENT_VER_ARR[2]}

# Increment the version depending on the release type
case $RELEASE_TYPE in
  major)
    NEW_VER_MAJOR=$((CURRENT_VER_MAJOR+1))
    NEW_VER_MINOR=0
    NEW_VER_PATCH=0
  ;;
  minor)
    NEW_VER_MAJOR=$CURRENT_VER_MAJOR
    NEW_VER_MINOR=$((CURRENT_VER_MINOR+1))
    NEW_VER_PATCH=0
  ;;
  patch)
    NEW_VER_MAJOR=$CURRENT_VER_MAJOR
    NEW_VER_MINOR=$CURRENT_VER_MINOR
    NEW_VER_PATCH=$((CURRENT_VER_PATCH+1))
  ;;
esac

# Compose the new version string
NEW_VER="$NEW_VER_MAJOR.$NEW_VER_MINOR.$NEW_VER_PATCH"
echo "Upgrading: $CURRENT_VER -> $NEW_VER"

# Change directory to the one containing this script
cd $(dirname $0)
# Build the image
docker build . -t $DOCKERHUB_REPOSITORY:$NEW_VER
# # Push the image
docker push $DOCKERHUB_REPOSITORY:$NEW_VER