Ported the generate-stackbrew-library script to MacOS

generate-stackbrew-library-mac.sh

@@ -0,0 +1,139 @@
+#!/opt/homebrew/bin/bash
+
+## You need to perform the following steps before executing this script:
+## 1. Install a newer version of bash: `brew install bash`.
+## 2. Install additional packages: `brew install coreutils gawk`.
+## 3. Ensure that you have `bashbrew` built and in your PATH.
+
+set -Eeuo pipefail
+
+declare -A aliases=(
+	[7.2]='7 latest'
+	[6.2]='6'
+)
+
+self="$(basename "$0")"
+cd "$(dirname "$(greadlink -f "$0")")"
+
+if [ "$#" -eq 0 ]; then
+	versions="$(jq -r 'keys | map(@sh) | join(" ")' versions.json)"
+	eval "set -- $versions"
+fi
+
+# sort version numbers with highest first
+IFS=$'\n'; set -- $(sort -rV <<<"$*"); unset IFS
+
+# get the most recent commit which modified any of "$@"
+fileCommit() {
+	git log -1 --format='format:%H' HEAD -- "$@"
+}
+
+# get the most recent commit which modified "$1/Dockerfile" or any file COPY'd from "$1/Dockerfile"
+dirCommit() {
+	local dir="$1"; shift
+	(
+		cd "$dir"
+		fileCommit \
+			Dockerfile \
+			$(git show HEAD:./Dockerfile | gawk '
+				toupper($1) == "COPY" {
+					for (i = 2; i < NF; i++) {
+						print $i
+					}
+				}
+			')
+	)
+}
+
+getArches() {
+	local repo="$1"; shift
+	local officialImagesUrl='https://github.com/docker-library/official-images/raw/master/library/'
+
+	eval "declare -g -A parentRepoToArches=( $(
+		find . -name 'Dockerfile' -exec gawk '
+				toupper($1) == "FROM" && $2 !~ /^('"$repo"'|scratch|.*\/.*)(:|$)/ {
+					print "'"$officialImagesUrl"'" $2
+				}
+			' '{}' + \
+			| sort -u \
+			| xargs bashbrew cat --format '[{{ .RepoName }}:{{ .TagName }}]="{{ join " " .TagEntry.Architectures }}"'
+	) )"
+}
+getArches 'redis'
+
+cat <<-EOH
+# this file is generated via https://github.com/redis/docker-library-redis/blob/$(fileCommit "$self")/$self
+
+Maintainers: David Maier <[email protected]> (@dmaier-redislabs),
+             Yossi Gottlieb <[email protected]> (@yossigo)
+GitRepo: https://github.com/redis/docker-library-redis.git
+EOH
+
+# prints "$2$1$3$1...$N"
+join() {
+	local sep="$1"; shift
+	local out; printf -v out "${sep//%/%%}%s" "$@"
+	echo "${out#$sep}"
+}
+
+for version; do
+	export version
+
+	fullVersion="$(jq -r '.[env.version].version' versions.json)"
+
+	versionAliases=()
+	while [ "$fullVersion" != "$version" ] && [ "${fullVersion%.*}" != "$fullVersion" ]; do
+		versionAliases+=( $fullVersion )
+		fullVersion="${fullVersion%.*}"
+	done
+	versionAliases+=(
+		$version
+		${aliases[$version]:-}
+	)
+
+	for variant in debian alpine; do
+		export variant
+		dir="$version/$variant"
+
+		commit="$(dirCommit "$dir")"
+
+		if [ "$variant" = 'debian' ]; then
+			variantAliases=( "${versionAliases[@]}" )
+		else
+			variantAliases=( "${versionAliases[@]/%/-$variant}" )
+			variantAliases=( "${variantAliases[@]//latest-/}" )
+		fi
+
+		parent="$(gawk 'toupper($1) == "FROM" { print $2 }' "$dir/Dockerfile")"
+		arches="${parentRepoToArches[$parent]}"
+
+		suite="${parent#*:}" # "bookworm-slim", "bookworm"
+		suite="${suite%-slim}" # "bookworm"
+		if [ "$variant" = 'alpine' ]; then
+			suite="alpine$suite" # "alpine3.18"
+		fi
+		suiteAliases=( "${versionAliases[@]/%/-$suite}" )
+		suiteAliases=( "${suiteAliases[@]//latest-/}" )
+		variantAliases+=( "${suiteAliases[@]}" )
+
+		# calculate the intersection of parent image arches and gosu arches
+		arches="$(jq -r --arg arches "$arches" '
+			(
+				$arches
+				| gsub("^[[:space:]]+|[[:space:]]+$"; "")
+				| split("[[:space:]]+"; "")
+			) as $parentArches
+			| .[env.version]
+			| $parentArches - ($parentArches - (.gosu.arches | keys))
+			| join(", ")
+		' versions.json)"
+
+		echo
+		cat <<-EOE
+			Tags: $(join ', ' "${variantAliases[@]}")
+			Architectures: $arches
+			GitCommit: $commit
+			Directory: $dir
+		EOE
+	done
+done