support patches for submodules

after cloning the submodules, search for patches under
builder/patches/<submodule_name> and apply them is appropriate.

Currently:
* dnbd3:
** configurable kernel version
* qemu-xmount:
** do not pass the relocatable option (-r) to the linker since it
conflicts with "-pie" that is activated by default on newer gcc.
** fix memfd compile errors

The last patch was taken from:
http://lists.openembedded.org/pipermail/openembedded-core/2018-January/146949.html

1 files changed, 6 insertions, 0 deletions

diff --git a/builder/build-initramfs.sh b/builder/build-initramfs.sh
index 7fac2186..2cb675a4 100755
--- a/builder/build-initramfs.sh
+++ b/builder/build-initramfs.sh
@@ -42,6 +42,12 @@ if ! [[ -d "$_needed_location" ]]; then
         git clone --depth 1 --branch "$branch"
     '
     git submodule update # --remote <- this seems like a bad idea
+    # apply patches for submodules
+    git submodule foreach '
+        for p in $(find ${toplevel}/builder/patches/${path##*/} -type f -name "*.patch" | sort -n); do
+        patch -p1 < $p || echo "Failed to patch $path with $p - expect errors."
+    done 2>/dev/null
+    '
     popd
     # finally copy all dracut modules under modules.d/
     cp --recursive \