Meta: Add 'copy-src' command to serenity.sh

This command copies the project's source tree to
/home/anon/Source/serenity in the built disk image.

This will be useful for working on serenity inside serenity :^)

Meta/build-root-filesystem.sh

@@ -155,6 +155,15 @@ cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibCpp/Tests/parser mnt/home/ano
 cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibCpp/Tests/preprocessor mnt/home/anon/cpp-tests/preprocessor
 cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibWasm/Tests mnt/home/anon/wasm-tests
 cp -r "$SERENITY_SOURCE_DIR"/Userland/Libraries/LibJS/Tests/test-common.js mnt/home/anon/wasm-tests
+
+if [ -n "$SERENITY_COPY_SOURCE" ] ; then
+ printf "\ncopying Serenity's source... "
+ rm -fr mnt/home/anon/Source/serenity
+ mkdir -p mnt/home/anon/Source/serenity
+ git clone --depth=1 file:https://"$SERENITY_SOURCE_DIR" mnt/home/anon/Source/serenity
+ rm -fr mnt/home/anon/Source/serenity/.git
+fi
+
 chmod 700 mnt/root
 chmod 700 mnt/home/anon
 chmod 700 mnt/home/nona

Meta/serenity.sh

@@ -40,6 +40,9 @@ Usage: $NAME COMMAND [TARGET] [ARGS...]
  attempt to find the BINARY_FILE in the appropriate build directory
  rebuild-toolchain: Deletes and re-builds the TARGET's toolchain
  rebuild-world: Deletes and re-builds the toolchain and build environment for TARGET.
+ copy-src: Same as image, but also copies the project's source tree to ~/Source/serenity
+ in the built disk image.
+
 
  Examples:
  $NAME run i686 smp=on
@@ -239,7 +242,7 @@ run_gdb() {
  fi
 }
 
-if [[ "$CMD" =~ ^(build|install|image|run|gdb|test|rebuild|recreate|kaddr2line|addr2line|setup-and-run)$ ]]; then
+if [[ "$CMD" =~ ^(build|install|image|copy-src|run|gdb|test|rebuild|recreate|kaddr2line|addr2line|setup-and-run)$ ]]; then
  cmd_with_target
  [[ "$CMD" != "recreate" && "$CMD" != "rebuild" ]] || delete_target
  [ "$TARGET" = "lagom" ] || ensure_toolchain
@@ -259,6 +262,13 @@ if [[ "$CMD" =~ ^(build|install|image|run|gdb|test|rebuild|recreate|kaddr2line|a
  build_target install
  build_target image
  ;;
+ copy-src)
+ lagom_unsupported
+ build_target
+ build_target install
+ export SERENITY_COPY_SOURCE=1
+ build_target image
+ ;;
  run)
  if [ "$TARGET" = "lagom" ]; then
  build_target "${CMD_ARGS[0]}"