fbt: optional shallow submodule checkout

fbt

@@ -15,6 +15,7 @@ FBT_NOENV="${FBT_NOENV:-""}";
 FBT_NO_SYNC="${FBT_NO_SYNC:-""}";
 FBT_TOOLCHAIN_PATH="${FBT_TOOLCHAIN_PATH:-$SCRIPT_PATH}";
 FBT_VERBOSE="${FBT_VERBOSE:-""}";
+FBT_SHALLOW="${FBT_SHALLOW:-""}";
 
 if [ -z "$FBT_NOENV" ]; then
     FBT_VERBOSE="$FBT_VERBOSE" . "$SCRIPT_PATH/scripts/toolchain/fbtenv.sh";
@@ -29,7 +30,12 @@ if [ -z "$FBT_NO_SYNC" ]; then
         echo "\".git\" directory not found, please clone repo via \"git clone\"";
         exit 1;
     fi
-    git submodule update --init --jobs "$N_GIT_THREADS";
+    _FBT_CLONE_FLAGS="--jobs $N_GIT_THREADS";
+    if [ -z "$FBT_SHALLOW" ]; then
+        _FBT_CLONE_FLAGS="$_FBT_CLONE_FLAGS --depth 1";
+    fi
+
+    git submodule update --init --recursive $_FBT_CLONE_FLAGS;
 fi
 
 $SCONS_EP $SCONS_DEFAULT_FLAGS "$@"

fbt.cmd

@@ -4,10 +4,18 @@ call "%~dp0scripts\toolchain\fbtenv.cmd" env
 set SCONS_EP=python -m SCons
 
 if [%FBT_NO_SYNC%] == [] (
+    set _FBT_CLONE_FLAGS=--jobs %NUMBER_OF_PROCESSORS%
+    if not [%FBT_SHALLOW%] == [] (
+        set _FBT_CLONE_FLAGS=%_FBT_CLONE_FLAGS% --depth 1
+    )
     if exist ".git" (
-        git submodule update --init --depth 1 --jobs %NUMBER_OF_PROCESSORS%
+        git submodule update --init --recursive %_FBT_CLONE_FLAGS%
+        if %ERRORLEVEL% neq 0 (
+            echo Failed to update submodules, set FBT_NO_SYNC to skip
+            exit /b 1
+        )
     ) else (
-        echo Not in a git repo, please clone with "git clone"
+        echo .git not found, please clone repo with "git clone"
         exit /b 1
     )
 )