Build gadget snap with snapcraft

This requires most recent snapcraft with support for hooks. canonical/snapcraft#1026

Author: longsleep

.gitignore

@@ -22,6 +22,6 @@
 /snappy/*/stage
 /snappy/*/prime
 /snappy/*/parts
-/snappy/gadget/uboot.env
-/snappy/gadget/uboot.conf
-/snappy/gadget/boot-assets
+/snappy/gadget/prebuilt/uboot.env
+/snappy/gadget/prebuilt/uboot.conf
+/snappy/gadget/prebuilt/boot-assets

snappy/README.md

@@ -2,5 +2,5 @@
 ## Build image
 
 ```
-UBUNTU_IMAGE_SKIP_COPY_UNVERIFIED_MODEL=1 ubuntu-image -c stable --image-size 2G --extra-snaps pine64_16.04-2_arm64.snap --extra-snaps kernel/pine64-kernel_3.10.104-2_arm64.snap -o test2.img pine64.model --debug
+UBUNTU_IMAGE_SKIP_COPY_UNVERIFIED_MODEL=1 ubuntu-image -c stable --image-size 2G --extra-snaps gadget/pine64_16.04-3_arm64.snap --extra-snaps kernel/pine64-kernel_3.10.104-2_arm64.snap -o test4.img pine64.model --debug
 ```

snappy/gadget.mk

@@ -3,31 +3,30 @@ include common.mk
 all: build
 
 clean:
-	rm -rf $(GADGET_DIR)/boot-assets
-	rm -f $(GADGET_DIR)/uboot.conf
-	rm -f $(GADGET_DIR)/uboot.env
-	rm -f $(GADGET_SNAP)
+	rm -rf $(GADGET_DIR)/prebuilt/boot-assets
+	rm -f $(GADGET_DIR)/prebuilt/uboot.conf
+	rm -f $(GADGET_DIR)/prebuilt/uboot.env
+	cd gadget; snapcraft clean
 
 distclean: clean
 
 u-boot:
-	@if [ ! -d $(GADGET_DIR)/boot-assets ] ; then mkdir -p $(GADGET_DIR)/boot-assets; fi
+	@if [ ! -d $(GADGET_DIR)/prebuilt/boot-assets ] ; then mkdir -p $(GADGET_DIR)/prebuilt/boot-assets; fi
 	@if [ ! -f $(UBOOT_BIN) ]; then echo "Build u-boot first."; exit 1; fi
-	cp -fa $(UBOOT_BIN) $(GADGET_DIR)/boot-assets/u-boot-with-dtb.bin
+	cp -fa $(UBOOT_BIN) $(GADGET_DIR)/prebuilt/boot-assets/u-boot-with-dtb.bin
 
 dtbs:
-	@if [ ! -d $(GADGET_DIR)/boot-assets/dtbs ] ; then mkdir -p $(GADGET_DIR)/boot-assets/dtbs; fi
-	dtc -Odtb -o $(GADGET_DIR)/boot-assets/dtbs/sun50i-a64-pine64-plus.dtb $(BLOBS_DIR)/pine64.dts
-	dtc -Odtb -o $(GADGET_DIR)/boot-assets/dtbs/sun50i-a64-pine64.dtb $(BLOBS_DIR)/pine64noplus.dts
-	dtc -Odtb -o $(GADGET_DIR)/boot-assets/dtbs/sun50i-a64-pine64so.dtb $(BLOBS_DIR)/pine64so.dts
+	@if [ ! -d $(GADGET_DIR)/prebuilt/boot-assets/dtbs ] ; then mkdir -p $(GADGET_DIR)/prebuilt/boot-assets/dtbs; fi
+	dtc -Odtb -o $(GADGET_DIR)/prebuilt/boot-assets/dtbs/sun50i-a64-pine64-plus.dtb $(BLOBS_DIR)/pine64.dts
+	dtc -Odtb -o $(GADGET_DIR)/prebuilt/boot-assets/dtbs/sun50i-a64-pine64.dtb $(BLOBS_DIR)/pine64noplus.dts
+	dtc -Odtb -o $(GADGET_DIR)/prebuilt/boot-assets/dtbs/sun50i-a64-pine64so.dtb $(BLOBS_DIR)/pine64so.dts
 
 preload: u-boot dtbs
-	cp -fa $(BLOBS_DIR)/boot0.bin $(GADGET_DIR)/boot-assets/boot0.bin
-	mkenvimage -r -s 131072  -o $(GADGET_DIR)/uboot.env $(GADGET_DIR)/uboot.env.in
-	@if [ ! -f $(GADGET_DIR)/uboot.conf ]; then ln -s uboot.env $(GADGET_DIR)/uboot.conf; fi
+	cp -fa $(BLOBS_DIR)/boot0.bin $(GADGET_DIR)/prebuilt/boot-assets/boot0.bin
+	mkenvimage -r -s 131072  -o $(GADGET_DIR)/prebuilt/uboot.env $(GADGET_DIR)/prebuilt/uboot.env.in
 
 snappy: preload
-	snapcraft snap gadget
+	cd gadget; snapcraft --target-arch amd64 snap
 
 build: dtbs preload snappy
 

snappy/gadget/meta/readme.md renamed to snappy/gadget/README.md

@@ -6,3 +6,9 @@ description: |
 type: gadget
 architectures:
     - arm64
+confinement: strict
+grade: stable
+parts:
+    prebuilt:
+        plugin: dump
+        source: prebuilt