build: split current and legacy OpenWrt packages

scripts/unpack-release-package-assets.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+if [ "$#" -ne 3 ]; then
+  echo "usage: $0 <release-assets-dir> <sdk-lock-file> <output-dir>" >&2
+  exit 2
+fi
+
+source_dir="$1"
+lock_file="$2"
+output_dir="$3"
+
+if [ ! -d "$source_dir" ]; then
+  echo "release assets directory does not exist: $source_dir" >&2
+  exit 1
+fi
+if [ ! -f "$lock_file" ]; then
+  echo "SDK lock file does not exist: $lock_file" >&2
+  exit 1
+fi
+if [ -e "$output_dir" ] && [ -n "$(find "$output_dir" -mindepth 1 -maxdepth 1 -print -quit 2>/dev/null)" ]; then
+  echo "output directory must be empty: $output_dir" >&2
+  exit 1
+fi
+mkdir -p "$output_dir"
+
+artifact_count=0
+while IFS=$'\t' read -r release target subtarget _sha256 _url; do
+  [ -n "$release" ] || continue
+  case "$release" in
+    \#*) continue ;;
+  esac
+
+  case "$target/$subtarget" in
+    x86/64) label="x86-64" ;;
+    *) label="${target}-${subtarget}" ;;
+  esac
+
+  artifact_name="openwrt-${release}-${label}"
+  destination="$output_dir/$artifact_name"
+  matched=0
+  for asset in "$source_dir/$artifact_name"-*; do
+    [ -f "$asset" ] || continue
+    mkdir -p "$destination"
+    basename="${asset##*/}"
+    cp "$asset" "$destination/${basename#"$artifact_name"-}"
+    matched=1
+  done
+  if [ "$matched" -eq 1 ]; then
+    artifact_count=$((artifact_count + 1))
+  fi
+done < "$lock_file"
+
+if [ "$artifact_count" -eq 0 ]; then
+  echo "no prefixed OpenWrt package assets found in $source_dir" >&2
+  exit 1
+fi
+
+echo "reconstructed ${artifact_count} OpenWrt package artifact directories"