make path-mapping-hardcoded.hook on the spot instead of downloading

saves a network request which github is being very stingy about lately

Author: Samueru-sama

useful-tools/quick-sharun.sh

@@ -1136,6 +1136,43 @@ _add_bwrap_wrapper() {
 	chmod +x "$APPDIR"/bin/bwrap
 }
 
+_add_path_mapping_hardcoded() {
+	f="$APPDIR"/bin/path-mapping-hardcoded.hook
+	if [ ! -x "$f" ]; then
+		mkdir -p "${f%/*}"
+		cat <<-'EOF' > "$f"
+		#!/bin/sh
+
+		# this script makes symnlinks to hardcoded random dirs that
+		# were patched away by quick-sharun when hardcoded paths are
+		# detected or when 'PATH_MAPPING_HARDCODED' is used
+
+		# make sure the _tmp_* vars come directly from the APPDIR .env file
+		unset _tmp_bin _tmp_lib _tmp_share
+
+		if ! command -v ln 1>/dev/null; then
+			>&2 echo "path-mapping-hardcoded: ERROR we cannot make symlinks"
+			>&2 echo "because command 'ln' is missing from the system! Aborting..."
+			exit 1
+		fi
+
+		if [ -f "$APPDIR"/.env ]; then
+			. "$APPDIR"/.env
+			if [ -n "$_tmp_bin" ]; then
+				ln -sfn "$APPDIR"/bin /tmp/"$_tmp_bin"
+			fi
+			if [ -n "$_tmp_lib" ]; then
+				ln -sfn "$APPDIR"/lib /tmp/"$_tmp_lib"
+			fi
+			if [ -n "$_tmp_share" ]; then
+				ln -sfn "$APPDIR"/share /tmp/"$_tmp_share"
+			fi
+		fi
+		EOF
+		chmod +x "$f"
+	fi
+}
+
 _patch_away_usr_bin_dir() {
 	if ! grep -Eaoq -m 1 "/usr/bin" "$1"; then
 		return 1
@@ -1147,7 +1184,7 @@ _patch_away_usr_bin_dir() {
 	fi
 
 	_echo "* patched away /usr/bin from $1"
-	ADD_HOOKS="${ADD_HOOKS:+$ADD_HOOKS:}path-mapping-hardcoded.hook"
+	_add_path_mapping_hardcoded
 }
 
 _patch_away_usr_lib_dir() {
@@ -1161,7 +1198,7 @@ _patch_away_usr_lib_dir() {
 	fi
 
 	_echo "* patched away /usr/lib from $1"
-	ADD_HOOKS="${ADD_HOOKS:+$ADD_HOOKS:}path-mapping-hardcoded.hook"
+	_add_path_mapping_hardcoded
 }
 
 _patch_away_usr_share_dir() {
@@ -1175,7 +1212,7 @@ _patch_away_usr_share_dir() {
 	fi
 
 	_echo "* patched away /usr/share from $1"
-	ADD_HOOKS="${ADD_HOOKS:+$ADD_HOOKS:}path-mapping-hardcoded.hook"
+	_add_path_mapping_hardcoded
 }
 
 _make_static_bin() (