*: rework update and generation scripts

This is necessary in order to have proper generation of variant and
version-based Dockerfiles from a single template.

Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>

update.sh

@@ -1,17 +1,38 @@
 #!/bin/bash
 set -eo pipefail
 
-current="$(
-	git ls-remote --tags https://github.com/nextcloud/server.git \
-		| awk -F 'refs/tags/' '
-			$2 ~ /^v?[0-9]/ {
-				gsub(/^v|\^.*/, "", $2);
-				print $2;
-			}
-		' \
-		| sort -uV \
-		| tail -1
-)"
+declare -A cmd=(
+	[apache]='apache2-foreground'
+	[fpm]='php-fpm'
+)
 
-set -x
-sed -ri 's/^(ENV NEXTCLOUD_VERSION) .*/\1 '"$current"'/;' ./Dockerfile
+latests=( $(curl -sSL 'https://nextcloud.com/changelog/' |tac|tac| \
+	grep -o "\(Version\|Release\)\s\+[[:digit:]]\+\(\.[[:digit:]]\+\)\+" | \
+	awk '{ print $2 }' | sort -V ) )
+
+for latest in "${latests[@]}"; do
+	version=$(echo "$latest" | cut -d. -f1-2)
+
+	for variant in apache fpm; do
+		# Create the version+variant directory with a Dockerfile.
+		mkdir -p "$version/$variant"
+		cp Dockerfile.template "$version/$variant/Dockerfile"
+
+		echo "updating $latest [$version] $variant"
+
+		# Replace the variables.
+		sed -ri -e '
+			s/%%VARIANT%%/'"$variant"'/g;
+			s/%%VERSION%%/'"$latest"'/g;
+			s/%%CMD%%/'"${cmd[$variant]}"'/g;
+		' "$version/$variant/Dockerfile"
+
+		# Remove Apache commands if we're not an Apache variant.
+		if [ "$variant" != "apache" ]; then
+			sed -ri -e '/a2enmod/d' "$version/$variant/Dockerfile"
+		fi
+
+		# Copy the docker-entrypoint.
+		cp docker-entrypoint.sh "$version/$variant/docker-entrypoint.sh"
+	done
+done