#!/bin/bash

set -e

# Safety checks to make sure we have required values

if [ -z "$CI_COMMIT_TAG" ]; then

echo "Error: CI_COMMIT_TAG was not provided"

exit 1

fi

if [ -z "$CI_COMMIT_SHA" ]; then

echo "Error: CI_COMMIT_SHA was not provided"

exit 1

fi

if [ -z "$IMG_DESTINATION_BASE" ]; then

echo "Error: IMG_DESTINATION_BASE. This should be set to the destination docker image, excluding the tag name, e.g. dd-lib-dotnet-init"

exit 1

fi

# If this is a pre-release release, we don't publish

if echo "$CI_COMMIT_TAG" | grep -q "-" > /dev/null; then

echo "Error: This is a pre-release version, should not publish images: $CI_COMMIT_TAG"

exit 1

fi

# Calculate the tags we use for floating major and minor versions

MAJOR_MINOR_VERSION="$(sed -nE 's/^(v[0-9]+\.[0-9]+)\.[0-9]+$/\1/p' <<< ${CI_COMMIT_TAG})"

MAJOR_VERSION="$(sed -nE 's/^(v[0-9]+)\.[0-9]+\.[0-9]+$/\1/p' <<< ${CI_COMMIT_TAG})"

# Make sure we have all the tags

git fetch --tags

# We need to determine whether this is is the latest tag and whether it's the latest major or not

# So we fetch all tags and sort them to find both the latest, and the latest in this major.

# 'sort' technically gets prerelease versions in the wrong order here, but we explicitly

# exclude them anyway, as they're ignored for the purposes of determining the 'latest' tags.

LATEST_TAG="$(git tag | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' | sort -V -r | head -n 1)"

LATEST_MAJOR_TAG="$(git tag -l "$MAJOR_VERSION.*" | grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' | sort -V -r | head -n 1)"

echo "This tag: $CI_COMMIT_TAG"

echo "Latest repository tag: $LATEST_TAG"

echo "Latest repository tag for this major: $LATEST_MAJOR_TAG"

echo "---------"

# GNU sort -C (silent) reports via exit code whether the data is already in sorted order

# We use this to check whether the current tag is greater than (or equal to) the latest tag

if printf '%s\n' "$LATEST_TAG" "$CI_COMMIT_TAG" | sort -C -V; then

# The current tag is the latest in the repository

IS_LATEST_TAG=1

else

IS_LATEST_TAG=0

fi

if printf '%s\n' "$LATEST_MAJOR_TAG" "$CI_COMMIT_TAG" | sort -C -V; then

# The current tag is the latest for this major version in the repository

IS_LATEST_MAJOR_TAG=1

else

IS_LATEST_MAJOR_TAG=0

fi

# print everything for debugging purposes

echo "Calculated values:"

echo "MAJOR_MINOR_VERSION=${MAJOR_MINOR_VERSION}"

echo "MAJOR_VERSION=${MAJOR_VERSION}"

echo "IS_LATEST_TAG=${IS_LATEST_TAG}"

echo "IS_LATEST_MAJOR_TAG=${IS_LATEST_MAJOR_TAG}"

echo "---------"

# Final check that everything is ok

# We should have a major_minor version

if [ -z "$MAJOR_MINOR_VERSION" ]; then

echo "Error: Could not determine major_minor version for stable release, this should not happen"

exit 1

fi

# if this is a latest major tag, we should have a major version

if [ "$IS_LATEST_MAJOR_TAG" -eq 1 ] && [ -z "$MAJOR_VERSION" ]; then

echo "Error: Could not determine major version for latest major release, this should not happen"

exit 1

fi

# Generate the final variables, and save them into build.env so they can be read by the trigger job

set_image_tags() {

SUFFIX="$1"

VARIABLE_SUFFIX="${SUFFIX:+_$SUFFIX}" # add a '_' prefix

TAG_SUFFIX="${SUFFIX:+-$SUFFIX}" # add a '-' prefix

# We always add this tag, regardless of the version

DESTINATIONS="${IMG_DESTINATION_BASE}:${CI_COMMIT_TAG}${TAG_SUFFIX}"

# We always add the major_minor tag (we never release 2.5.2 _after_ 2.5.3, for example)

DESTINATIONS="${DESTINATIONS},${IMG_DESTINATION_BASE}:${MAJOR_MINOR_VERSION}${TAG_SUFFIX}"

# Only latest-major releases get the major tag

if [ "$IS_LATEST_MAJOR_TAG" -eq 1 ]; then

DESTINATIONS="${DESTINATIONS},${IMG_DESTINATION_BASE}:${MAJOR_VERSION}${TAG_SUFFIX}"

fi

# Only latest releases get the latest tag

if [ "$IS_LATEST_TAG" -eq 1 ]; then

DESTINATIONS="${DESTINATIONS},${IMG_DESTINATION_BASE}:latest${TAG_SUFFIX}"

fi

# Save the value to the build.env file

echo "IMG_DESTINATIONS${VARIABLE_SUFFIX}=${DESTINATIONS}"

echo "IMG_DESTINATIONS${VARIABLE_SUFFIX}=${DESTINATIONS}" >> build.env

}

# Calculate the non-suffixed tags

set_image_tags

# For each suffix, calculate the tags

for ADDITIONAL_TAG_SUFFIX in ${ADDITIONAL_TAG_SUFFIXES//,/ }

do

set_image_tags "$ADDITIONAL_TAG_SUFFIX"

done