Add simple experimental android upgrader script

Author: ayufan

package/root/usr/local/sbin/pine64_upgrade_android.sh

@@ -0,0 +1,98 @@
+#!/bin/bash
+
+set -eo pipefail
+
+if [[ "$(id -u)" -ne "0" ]]; then
+	echo "This script requires root."
+	exit 1
+fi
+
+echo "Pine A64/Pinebook Android upgrader (experimental)!"
+echo "(C) 2017. Kamil Trzciński (https://ayufan.eu)."
+echo ""
+
+usage() {
+    echo "Usage:"
+    echo "$ $0 <device> <system> [version]"
+    echo ""
+    echo "Systems:"
+    echo " - android-7.0 (https://github.com/ayufan-pine64/android-7.0/releases)"
+    echo " - android-7.1 (https://github.com/ayufan-pine64/android-7.0/releases)"
+    echo ""
+    echo "Version:"
+    echo " - latest will be used if version is not defined"
+    exit 1
+}
+
+if [[ $# -ne 2 ]] && [[ $# -ne 3 ]]; then
+    usage
+fi
+
+if [[ "$2" != "android-7.0" ]] || [[ "$2" != "android-7.1" ]]; then
+    usage
+fi
+
+REPO="ayufan-pine64/$2"
+if [[ "$(cat /etc/pine64_model)" -eq "pinebook" ]]; then
+    PREFIX="$2-pine-a64-pinebook-v"
+else
+    PREFIX="$2-pine-a64-v"
+fi
+SUFFIX="-r[0-9]*.img.gz"
+ARCHIVER="gzip -d"
+
+VERSION="$3"
+
+if [[ -z "$VERSION" ]]; then
+	VERSION=$(curl -f -sS https://api.github.com/repos/$REPO/releases/latest | jq -r ".tag_name")
+	if [ -z "$VERSION" ]; then
+		echo "Latest release was not for $2."
+        echo "Please go to: https://github.com/$REPO/releases/latest"
+        exit 1
+	fi
+
+	echo "Using latest release: $VERSION from https://github.com/$REPO/releases."
+fi
+
+NAME="$PREFIX$VERSION$SUFFIX"
+NAME_SAFE="${NAME//./\\.}"
+VERSION_SAFE="${VERSION//./\\.}"
+
+echo "Looking for download URL..."
+DOWNLOAD_URL=$(curl -f -sS https://api.github.com/repos/$REPO/releases | \
+    jq -r ".[].assets | .[].browser_download_url" | \
+    ( grep -o "https://github\.com/$REPO/releases/download/$VERSION_SAFE/$NAME_SAFE" || true))
+
+if [[ -z "$DOWNLOAD_URL" ]]; then
+    echo "The download URL for $NAME not found".
+    echo "Look at https://github.com/$REPO/releases for correct versions."
+    exit 1
+fi
+
+echo "Doing this will overwrite all data stored on eMMC."
+
+while true; do
+    echo "Type YES to continue or Ctrl-C to abort."
+    read CONFIRM
+    if [[ "$CONFIRM" == "YES" ]]; then
+        break
+    fi
+done
+
+echo ""
+echo "Using $DOWNLOAD_URL..."
+echo "Umounting..."
+umount -f $1* || true
+echo ""
+
+START=16 # 8k
+END=4337664 # 2,220,883,968
+
+echo "Downloading and upgrade $1..."
+curl -L -f "$DOWNLOAD_URL" | $ARCHIVER | \
+    tail -c "+$((START*512))" | \
+    dd bs=8k seek="$((START/16))" count="$(((END-START)/16))" "of=$1"
+sync
+echo ""
+
+echo "Done."