Added a script to simplify images mirroring to AWS ECR

sync-awsecr.sh

+#!/bin/bash
+set -eu
+
+image="nginx"
+registry="public.ecr.aws/z9d2n7e1"
+
+declare -A aliases
+aliases=(
+	[mainline]='1 1.19 latest'
+	[stable]='1.18'
+)
+
+architectures=( amd64 arm64v8 )
+
+self="$(basename "$BASH_SOURCE")"
+cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
+base=debian
+
+versions=( mainline stable )
+
+pulllist=()
+declare -A taglist
+taglist=()
+
+# get the most recent commit which modified any of "$@"
+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 | awk '
+				toupper($1) == "COPY" {
+					for (i = 2; i < NF; i++) {
+						print $i
+					}
+				}
+			')
+	)
+}
+
+# prints "$2$1$3$1...$N"
+join() {
+	local sep="$1"; shift
+	local out; printf -v out "${sep//%/%%}%s" "$@"
+	echo "${out#$sep}"
+}
+
+for version in "${versions[@]}"; do
+	commit="$(dirCommit "$version/$base")"
+	fullVersion="$(git show "$commit":"$version/$base/Dockerfile" | awk '$1 == "ENV" && $2 == "NGINX_VERSION" { print $3; exit }')"
+    pulllist+=( "$image:$fullVersion" )
+    for variant in perl alpine alpine-perl; do
+        pulllist+=( "$image:$fullVersion-$variant" )
+    done
+done
+
+for version in "${versions[@]}"; do
+	commit="$(dirCommit "$version/$base")"
+
+	fullVersion="$(git show "$commit":"$version/$base/Dockerfile" | awk '$1 == "ENV" && $2 == "NGINX_VERSION" { print $3; exit }')"
+
+	versionAliases=( $fullVersion )
+	if [ "$version" != "$fullVersion" ]; then
+		versionAliases+=( $version )
+	fi
+	versionAliases+=( ${aliases[$version]:-} )
+
+    for tag in ${versionAliases[@]:1}; do
+        taglist["$image:$tag"]="$image:$fullVersion"
+    done
+
+	for variant in debian-perl; do
+		variantAliases=( "${versionAliases[@]/%/-perl}" )
+		variantAliases=( "${variantAliases[@]//latest-/}" )
+
+        for tag in ${variantAliases[@]}; do
+	    if [ "$tag" != "${fullVersion}-perl" ]; then
+            taglist["$image:$tag"]="$image:$fullVersion-perl"
+        fi
+        done
+	done
+
+	for variant in alpine alpine-perl; do
+		commit="$(dirCommit "$version/$variant")"
+
+		variantAliases=( "${versionAliases[@]/%/-$variant}" )
+		variantAliases=( "${variantAliases[@]//latest-/}" )
+
+        for tag in ${variantAliases[@]}; do
+	        if [ "$tag" != "${fullVersion}-$variant" ]; then
+                taglist["$image:$tag"]="$image:${fullVersion}-$variant"
+            fi
+        done
+	done
+
+done
+
+echo "#!/bin/sh"
+echo "set -ex"
+echo
+echo "export DOCKER_CLI_EXPERIMENTAL=enabled"
+echo
+echo "# pulling stuff"
+for arch in ${architectures[@]}; do
+for tag in ${pulllist[@]}; do
+    echo "docker pull $arch/$tag";
+done
+done
+
+echo
+
+echo "# tagging stuff"
+
+for arch in ${architectures[@]}; do
+for tag in ${pulllist[@]}; do
+    echo "docker tag $arch/$tag $registry/$tag-$arch"
+done
+for tag in ${!taglist[@]}; do
+    echo "docker tag $arch/${taglist[$tag]} $registry/$tag-$arch"
+done
+done
+
+echo "# pushing stuff"
+
+for arch in ${architectures[@]}; do
+for tag in ${pulllist[@]}; do
+    echo "docker push $registry/$tag-$arch"
+done
+for tag in ${!taglist[@]}; do
+    echo "docker push $registry/$tag-$arch"
+done
+done
+
+echo
+echo "# manifesting stuff"
+for tag in ${pulllist[@]} ${!taglist[@]}; do
+    string="docker manifest create --amend $registry/$tag"
+    for arch in ${architectures[@]}; do
+        string+=" $registry/$tag-$arch"
+    done
+    echo $string
+done
+
+echo
+echo "# pushing manifests"
+for tag in ${pulllist[@]} ${!taglist[@]}; do
+    echo "docker manifest push --purge $registry/$tag"
+done