2 files changed, 66 insertions, 6 deletions
diff --git a/scripts/archive-source.sh b/scripts/archive-source.sh
index c4e7d98f4d..4e63774f9a 100755
--- a/scripts/archive-source.sh
+++ b/scripts/archive-source.sh
@@ -18,15 +18,37 @@ if test $# -lt 1; then
     error "Usage: $0 <output tarball>"
 fi
 
-tar_file="$1"
-list_file="$1.list"
-submodules=$(git submodule foreach --recursive --quiet 'echo $name')
+tar_file=`realpath "$1"`
+list_file="${tar_file}.list"
+vroot_dir="${tar_file}.vroot"
 
-if test $? -ne 0; then
-    error "git submodule command failed"
+# We want a predictable list of submodules for builds, that is
+# independent of what the developer currently has initialized
+# in their checkout, because the build environment is completely
+# different to the host OS.
+submodules="dtc ui/keycodemapdb"
+
+trap "status=$?; rm -rf \"$list_file\" \"$vroot_dir\"; exit \$status" 0 1 2 3 15
+
+if git diff-index --quiet HEAD -- &>/dev/null
+then
+    HEAD=HEAD
+else
+    HEAD=`git stash create`
 fi
+git clone --shared . "$vroot_dir"
+test $? -ne 0 && error "failed to clone into '$vroot_dir'"
+
+cd "$vroot_dir"
+test $? -ne 0 && error "failed to change into '$vroot_dir'"
+
+git checkout $HEAD
+test $? -ne 0 && error "failed to checkout $HEAD revision"
 
-trap "status=$?; rm -f \"$list_file\"; exit \$status" 0 1 2 3 15
+for sm in $submodules; do
+    git submodule update --init $sm
+    test $? -ne 0 && error "failed to init submodule $sm"
+done
 
 if test -n "$submodules"; then
     {
diff --git a/scripts/git-submodule.sh b/scripts/git-submodule.sh
new file mode 100755
index 0000000000..d8fbc7e47e
--- /dev/null
+++ b/scripts/git-submodule.sh
@@ -0,0 +1,38 @@
+#!/bin/sh
+#
+# This code is licensed under the GPL version 2 or later.  See
+# the COPYING file in the top-level directory.
+
+set -e
+
+substat=".git-submodule-status"
+
+command=$1
+shift
+modules="$@"
+
+if test -z "$modules"
+then
+    test -e $substat || touch $substat
+    exit 0
+fi
+
+if ! test -e ".git"
+then
+    echo "$0: unexpectedly called with submodules but no git checkout exists"
+    exit 1
+fi
+
+case "$command" in
+status)
+    test -f "$substat" || exit 1
+    trap "rm -f ${substat}.tmp" EXIT
+    git submodule status $modules > "${substat}.tmp"
+    diff "${substat}" "${substat}.tmp" >/dev/null
+    exit $?
+    ;;
+update)
+    git submodule update --init $modules 1>/dev/null 2>&1
+    git submodule status $modules > "${substat}"
+    ;;
+esac