scripts: add minirootfs release image

scripts/genrootfs.sh

+#!/bin/sh -e
+
+cleanup() {
+	rm -rf "$tmp"
+}
+
+tmp="$(mktemp -d)"
+trap cleanup EXIT
+
+arch="$(apk --print-arch)"
+repositories_file=/etc/apk/repositories
+keys_dir=/etc/apk/keys
+
+while getopts "a:r:k:o:" opt; do
+	case $opt in
+	a) arch="$OPTARG";;
+	r) repositories_file="$OPTARG";;
+	k) keys_dir="$OPTARG";;
+	o) outfile="$OPTARG";;
+	esac
+done
+shift $(( $OPTIND - 1))
+
+cat "$repositories_file"
+
+if [ -z "$outfile" ]; then
+	outfile=$name-$arch.tar.gz
+fi
+
+${APK:-apk} add --keys-dir "$keys_dir" \
+	--repositories-file "$repositories_file" \
+	--no-script --no-cache --root "$tmp" --initdb \
+	"$@"
+for link in $("$tmp"/bin/busybox --list-full); do
+	[ -e "$tmp"/$link ] || ln -s /bin/busybox "$tmp"/$link
+done
+
+${APK:-apk} fetch --keys-dir "$keys_dir" \
+	--repositories-file "$repositories_file" \
+	--stdout alpine-base | tar -zx -C "$tmp" etc/
+
+branch=edge
+VERSION_ID=$(awk -F= '$1=="VERSION_ID" {print $2}'  "$tmp"/etc/os-release)
+case $VERSION_ID in
+*_alpha*|*_beta*) branch=edge;;
+*.*.*) branch=v${VERSION_ID%.*};;
+esac
+
+cat > "$tmp"/etc/apk/repositories <<EOF
+http://dl-cdn.alpinelinux.org/alpine/$branch/main
+http://dl-cdn.alpinelinux.org/alpine/$branch/community
+EOF
+
+#rm -rf "$tmp"/var/cache/apk/*
+
+tar --numeric-owner -c -C "$tmp" . | gzip -9n > "$outfile"

scripts/mkimage.sh

@@ -172,7 +172,7 @@ build_profile() {
 
 	if [ "$_dirty" = "yes" -o ! -e "$output_file" ]; then
 		# Create image
-		output_format="${image_ext//[:\.]/}"
+		[ -n "$output_format" ] || output_format="${image_ext//[:\.]/}"
 		create_image_${output_format} || { _fail="yes"; false; }
 
 		if [ "$_checksum" = "yes" ]; then

scripts/mkimg.minirootfs.sh

+section_minirootfs() {
+	return 0
+}
+
+create_image_rootfs() {
+	local _script=$(readlink -f "$scriptdir/genrootfs.sh")
+	local output_file="$(readlink -f ${OUTDIR:-.})/$output_filename"
+
+	(cd "$OUTDIR"; fakeroot "$_script" -k "$APKROOT"/etc/apk/keys \
+		-r "$APKROOT"/etc/apk/repositories \
+		-o "$output_file" \
+		-a $ARCH \
+		$rootfs_apks)
+}
+
+profile_minirootfs() {
+	image_ext=tar.gz
+	output_format=rootfs
+	arch="x86 x86_64 armhf aarch64"
+	rootfs_apks="busybox alpine-baselayout alpine-keys apk-tools libc-utils"
+}