Merge ~sylvain-pineau/checkbox-core-snap:lk-boot-env into checkbox-core-snap:master

[Sylvain Pineau]

A new part to provide a the lk-boot-env command an get access to bootloader properties such as the boot partition names.

[Sylvain Pineau (sylvain-pineau)]

(12:19:06 PM) joc: ok, could we define our own part in our checkbox snapcraft.yaml so we can use lk-boot-env ?
(12:20:21 PM) spineau: with all files in snapd 2.42+ we could/should
(12:20:21 PM) joc: spineau: sound reasonable? basically this part https://git.launchpad.net/~ondrak/+git/snap-bootsel-env/tree/snap/snapcraft.yaml#n62
(12:21:15 PM) joc: i still wonder if a bootloader resource job that does all this stuff in one place is a good idea
(12:21:59 PM) spineau: joc: I did consider it as a part for munich but now that all files are coming from snapd, checkbox core snap can bundle it
(12:22:30 PM) joc: +1

review: Approve

diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 783dc39..a018eda 100644
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -291,6 +291,30 @@ parts:
     python-packages:
       - RPi.GPIO
 ################################################################################
+  lk-boot-env:
+    plugin: nil
+    source: .
+    override-pull: |
+      snapcraftctl pull
+      wget https://github.com/snapcore/snapd/raw/master/include/lk/snappy_boot_v1.h
+      wget https://raw.githubusercontent.com/kubiko/if6640-gadget/18/snap-boot-sel/lk-boot-env.c
+    build-packages:
+      - wget
+      - on amd64 to armhf:
+        - gcc-arm-linux-gnueabihf:amd64
+      - on amd64 to arm64:
+        - gcc-aarch64-linux-gnu:amd64
+    override-build: |
+      mkdir -p ${SNAPCRAFT_PART_INSTALL}/bin
+      if [ "${SNAPCRAFT_ARCH_TRIPLET}" = "arm-linux-gnueabihf" ]; then
+          arm-linux-gnueabihf-gcc lk-boot-env.c -I/usr/include/ -Iapp/aboot -o ${SNAPCRAFT_PART_INSTALL}/bin/lk-boot-env
+      elif [ "${SNAPCRAFT_ARCH_TRIPLET}" = "aarch64-linux-gnu" ]; then
+          aarch64-linux-gnu-gcc lk-boot-env.c -I/usr/include/ -Iapp/aboot -o ${SNAPCRAFT_PART_INSTALL}/bin/lk-boot-env
+      else
+          # native build
+          gcc lk-boot-env.c -I/usr/include/ -Iapp/aboot -o ${SNAPCRAFT_PART_INSTALL}/bin/lk-boot-env
+      fi
+################################################################################
   tpm2-tss:
     plugin: autotools
     source: https://github.com/tpm2-software/tpm2-tss