Initial Commit

Signed-off-by: Gabriele Bartolini <gabriele.bartolini@enterprisedb.com>

.github/generate-strategy.sh

@@ -0,0 +1,74 @@
+#!/usr/bin/env bash
+#
+# Given a list of PostgreSQL versions (defined as directories in the root
+# folder of the project), this script generates a JSON object that will be used
+# inside the Github workflows as a strategy to create a matrix of jobs to run.
+# The JSON object contains, for each PostgreSQL version, the tags of the
+# container image to be built.
+#
+set -eu
+
+# Define an optional aliases for some major versions
+declare -A aliases=(
+	[14]='latest'
+)
+
+cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}/..")")"
+BASE_DIRECTORY="$(pwd)"
+
+
+# Retrieve the PostgreSQL versions for Debian
+cd ${BASE_DIRECTORY}/Debian
+for version in */; do
+	[[ $version == src/ ]] && continue
+	debian_versions+=("$version")
+done
+debian_versions=("${debian_versions[@]%/}")
+
+# Sort the version numbers with highest first
+mapfile -t debian_versions < <(IFS=$'\n'; sort -rV <<< "${debian_versions[*]}")
+
+# prints "$2$1$3$1...$N"
+join() {
+	local sep="$1"
+	shift
+	local out
+	printf -v out "${sep//%/%%}%s" "$@"
+	echo "${out#$sep}"
+}
+
+entries=()
+for version in "${debian_versions[@]}"; do
+
+	# Read versions from the definition file
+	versionFile="${version}/.versions.json"
+	postgresImageVersion=$(jq -r '.POSTGRES_IMAGE_VERSION | split("-") | .[0]' "${versionFile}")
+	releaseVersion=$(jq -r '.IMAGE_RELEASE_VERSION' "${versionFile}")
+
+	# Initial aliases are "major version", "optional alias", "full version with release"
+	# i.e. "14", "latest", "14.2-1", "14.2-debian","14.2"
+	versionAliases=(
+			"${version}"
+			${aliases[$version]:+"${aliases[$version]}"}
+			"${postgresImageVersion}-${releaseVersion}"
+			"${postgresImageVersion}"
+		)
+	# Add all the version prefixes between full version and major version
+	# i.e "13.2"
+	while [ "$postgresImageVersion" != "$version" ] && [ "${postgresImageVersion%[.-]*}" != "$postgresImageVersion" ]; do
+		versionAliases+=("$postgresImageVersion-debian")
+		postgresImageVersion="${postgresImageVersion%[.-]*}"
+	done
+    # Support platform for container images
+	platforms="linux/amd64"
+
+	# Build the json entry
+	entries+=(
+		"{\"name\": \"Debian ${postgresImageVersion}\", \"platforms\": \"$platforms\", \"dir\": \"Debian/$version\", \"file\": \"Debian/$version/Dockerfile\", \"version\": \"$version\", \"tags\": [\"$(join "\", \"" "${versionAliases[@]}")\"]}"
+	)
+done
+
+# Build the strategy as a JSON object
+strategy="{\"fail-fast\": false, \"matrix\": {\"include\": [$(join ', ' "${entries[@]}")]}}"
+jq -C . <<<"$strategy" # sanity check / debugging aid
+echo "::set-output name=strategy::$(jq -c . <<<"$strategy")"