From 37c69cd1714de351db1eee895107f4cf8126a77b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pedro=20Hern=C3=A1ndez?= <pedrohdezmlg@gmail.com>
Date: Mon, 16 Mar 2026 10:09:10 +0100
Subject: [PATCH] feat: Bootclasspath patch generator tool
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: Pedro Hernández <pedrohdezmlg@gmail.com>
---
 scripts/build-patch.sh          | 119 ++++++++++++++++++++++++++++++++
 scripts/list-changed-classes.sh |  94 +++++++++++++++++++++++++
 2 files changed, 213 insertions(+)
 create mode 100755 scripts/build-patch.sh
 create mode 100755 scripts/list-changed-classes.sh

diff --git a/scripts/build-patch.sh b/scripts/build-patch.sh
new file mode 100755
index 0000000000..35aa5732d3
--- /dev/null
+++ b/scripts/build-patch.sh
@@ -0,0 +1,119 @@
+#!/bin/sh
+
+set -eu
+
+help() {
+  cat <<EOF
+Usage: $0 [OPTION]... [SOURCES-FILE]
+
+Build a glibj patch ZIP archive from a list of changed Java source files.
+Reads source paths from SOURCES-FILE, or from standard input if omitted.
+
+Options:
+  -o, --output FILE
+                write patch archive to FILE (default: lib/glibj-patch.zip)
+  -h, --help    display this help and exit
+EOF
+  exit 0
+}
+
+OUTPUT_PATH=""
+
+while [ "$#" -gt 0 ]; do
+  case "$1" in
+    -o|--output) OUTPUT_PATH="$2"; shift 2 ;;
+    -h|--help) help ;;
+    -*) echo "$0: unknown option: $1" >&2; exit 1 ;;
+    *) break ;;
+  esac
+done
+
+if [ "$#" -gt 1 ]; then
+  echo "$0: too many arguments" >&2
+  exit 1
+fi
+SOURCES_FILE="${1:-}"
+
+REPO_ROOT="$(git rev-parse --show-toplevel)"
+
+if [ -z "$OUTPUT_PATH" ]; then
+  OUTPUT_PATH="${REPO_ROOT}/lib/glibj-patch.zip"
+elif [ "${OUTPUT_PATH#/}" = "$OUTPUT_PATH" ]; then
+  OUTPUT_PATH="$PWD/$OUTPUT_PATH"
+fi
+
+if [ -n "$SOURCES_FILE" ]; then
+  CHANGED_SOURCES=$(cat "$SOURCES_FILE")
+else
+  if [ -t 0 ]; then
+    # true if stdin is a terminal (i.e. no pipe or redirect)
+    echo "$0: expected list of .java paths on stdin or as a file argument" >&2
+    exit 1
+  fi
+
+  CHANGED_SOURCES=$(cat)
+fi
+
+if [ -z "$CHANGED_SOURCES" ]; then
+  echo "No modified Java sources to build."
+  exit 0
+fi
+
+source_base() {
+  src=$1
+
+  awk -v root="$REPO_ROOT" -v src="$src" '
+    {
+      full = $2 "/" $3
+      prefix = root "/"
+
+      if (index(full, prefix) == 1) {
+        full = substr(full, length(prefix) + 1)
+      }
+
+      if (full == src) {
+        sub(/\.java$/, "", $3)
+        print $3
+        exit
+      }
+    }
+  ' "$REPO_ROOT/lib/classes.1"
+}
+
+PATCH_LIST="$(mktemp "${TMPDIR:-/tmp}/build-patch-archive.XXXXXX")"
+
+cleanup() {
+  rm -f "$PATCH_LIST"
+}
+trap cleanup EXIT
+trap 'exit 1' HUP INT QUIT TERM
+
+printf '%s\n' "$CHANGED_SOURCES" |
+while IFS= read -r src; do
+  base=$(source_base "$src")
+
+  [ -n "$base" ] || continue
+
+  if [ -f "${REPO_ROOT}/lib/${base}.class" ]; then
+    printf '%s\n' "${base}.class"
+  fi
+
+  for inner in "${REPO_ROOT}/lib/${base}"\$*.class; do
+    [ -f "$inner" ] || continue
+    printf '%s\n' "${inner#${REPO_ROOT}/lib/}"
+  done
+done > "$PATCH_LIST"
+
+if [ ! -s "$PATCH_LIST" ]; then
+  echo "$0: no compiled class files found for modified Java sources" >&2
+  exit 1
+fi
+
+rm -f "$OUTPUT_PATH"
+
+(
+  cd "${REPO_ROOT}/lib"
+  jar cf "$OUTPUT_PATH" @"$PATCH_LIST"
+)
+
+echo "Patch archive created: $OUTPUT_PATH"
diff --git a/scripts/list-changed-classes.sh b/scripts/list-changed-classes.sh
new file mode 100755
index 0000000000..23ae9a43d1
--- /dev/null
+++ b/scripts/list-changed-classes.sh
@@ -0,0 +1,94 @@
+#!/bin/sh
+
+set -eu
+
+help() {
+  cat <<EOF
+Usage: $0 [OPTION]... <old-ref>
+
+List glibj Java source files changed between <old-ref> and HEAD.
+
+Options:
+  -e, --exclude FILE
+                exclude sources listed in FILE
+  -h, --help    display this help and exit
+EOF
+  exit 0
+}
+
+EXCLUDE_PATH=""
+
+while [ "$#" -gt 0 ]; do
+  case "$1" in
+    -e|--exclude) EXCLUDE_PATH="$2"; shift 2 ;;
+    -h|--help) help ;;
+    -*) echo "$0: unknown option: $1" >&2; exit 1 ;;
+    *) break ;;
+  esac
+done
+
+if [ "$#" -ne 1 ]; then
+  echo "$0: expected exactly one argument" >&2
+  exit 1
+fi
+OLD_REF=$1
+NEW_REF=HEAD
+
+if [ -n "$EXCLUDE_PATH" ] && [ ! -e "$EXCLUDE_PATH" ]; then
+  echo "error: exclude file not found: $EXCLUDE_PATH" >&2
+  exit 1
+fi
+
+is_excluded() {
+  src=$1
+
+  while IFS= read -r exclude; do
+    exclude=$(printf '%s\n' "$exclude" | sed 's/^[[:space:]]*//; s/[[:space:]]*$//')
+
+    case "$exclude" in
+      ''|\#*) continue ;;
+      */) exclude=${exclude%/} ;;
+    esac
+
+    case "$exclude" in
+      *.java)
+        [ "$src" = "$exclude" ] && return 0
+        ;;
+      *)
+        case "$src" in
+          "$exclude"/*) return 0 ;;
+        esac
+        ;;
+    esac
+  done < "$EXCLUDE_PATH"
+
+  return 1
+}
+
+is_glibj_source() {
+  # Source dirs mirror what gen-classlist.sh scans
+  case "$1" in
+    java/*|javax/*|gnu/*|org/*|sun/*|external/*|vm/reference/*) return 0 ;;
+    *) return 1 ;;
+  esac
+}
+
+CHANGED_SOURCES=$(
+  git diff --name-only --diff-filter=ACMR "$OLD_REF" "$NEW_REF" -- '*.java' |
+  while IFS= read -r src; do
+    is_glibj_source "$src" || continue
+
+    if [ -n "$EXCLUDE_PATH" ] && is_excluded "$src"; then
+      continue
+    fi
+
+    printf '%s\n' "$src"
+  done
+)
+
+if [ -z "$CHANGED_SOURCES" ]; then
+  echo "No modified glibj Java sources found between ${OLD_REF} and ${NEW_REF}."
+  exit 0
+fi
+
+printf '%s\n' "$CHANGED_SOURCES"