Meta: get rid of sync.sh using the technique used in the previous commit

Author: https://github.com/emanuele6
Commit: https://github.com/SerenityOS/serenity/commit/4a784d4d1bc
Pull-request: https://github.com/SerenityOS/serenity/pull/2595

CMakeLists.txt

@@ -13,7 +13,7 @@ set(CMAKE_INSTALL_MESSAGE NEVER)
 enable_testing()
 
 add_custom_target(image
-    COMMAND ${CMAKE_COMMAND} -E env "SERENITY_ROOT=${CMAKE_SOURCE_DIR}" ${CMAKE_SOURCE_DIR}/Meta/sync.sh
+    COMMAND ${CMAKE_COMMAND} -E env "SERENITY_ROOT=${CMAKE_SOURCE_DIR}" ${CMAKE_SOURCE_DIR}/Meta/build-image-qemu.sh
     BYPRODUCTS ${CMAKE_BINARY_DIR}/_disk_image
     USES_TERMINAL
 )

Meta/build-image-qemu.sh

@@ -8,8 +8,9 @@ die() {
 }
 
 if [ "$(id -u)" != 0 ]; then
-    die "this script needs to run as root"
+    exec sudo -E -- "$0" "$@" || die "this script needs to run as root"
 fi
+
 if [ "$(uname -s)" = "Darwin" ]; then
     export PATH="/usr/local/opt/e2fsprogs/bin:$PATH"
     export PATH="/usr/local/opt/e2fsprogs/sbin:$PATH"

Meta/sync.sh

@@ -1,6 +0,0 @@
-#!/bin/sh
-set -e
-
-script_path=$(cd -P -- "$(dirname -- "$0")" && pwd -P)
-
-sudo -E PATH="$PATH" "$script_path/build-image-qemu.sh"