pi/common: add buildimage command to create .img

Signed-off-by: Luis Banuelos <[email protected]>
Reviewed-by: Christian Stewart <[email protected]>

configs/pi/common/extensions/Makefile

@@ -4,3 +4,8 @@ format:
 install:
 	@$(SKIFF_CURRENT_CONF_DIR)/scripts/install_sd.sh
 
+buildimage:
+	@$(SKIFF_CURRENT_CONF_DIR)/scripts/build_image.sh
+
+# alias to buildimage
+create-image: buildimage

configs/pi/common/metadata/commands

@@ -1,2 +1,3 @@
 format Format a SD card and install bootloader.
 install Installs to a formatted SD card.
+buildimage Builds an image using a loopback device.

configs/pi/common/scripts/build_image.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+if [ $EUID != 0 ]; then
+    echo "This script requires sudo, so it might not work."
+fi
+
+set -e
+
+if [ -z "$PI_IMAGE" ]; then
+    echo "Please set PI_IMAGE and try agian."
+    exit 1
+fi
+
+if [[ "$PI_IMAGE" != /* ]]; then
+    PI_IMAGE=$WORKSPACE_DIR/$PI_IMAGE
+fi
+
+echo "Allocating image..."
+dd if=/dev/zero of=$PI_IMAGE bs=1GB count=1
+
+echo "Setting up loopback device..."
+PI_SD=$(sudo losetup --show -fP $PI_IMAGE)
+
+# Setup no interactive since we know its a brand new file.
+export SKIFF_NO_INTERACTIVE=1
+
+$SKIFF_CURRENT_CONF_DIR/scripts/format_sd.sh
+$SKIFF_CURRENT_CONF_DIR/scripts/install_sd.sh
+
+echo "Removing loopback device..."
+sudo losetup -d $PI_SD