dump partitions from an Android device (excluding userdata)

dump_partitions.sh

#!/bin/bash

VERSION=$(adb shell getprop ro.build.version.incremental | tr -d '\r\n')
TIMESTAMP=$(date +%Y%m%d_%H%M%S)
FOLDER="dump_${VERSION}_${TIMESTAMP}"
START_TIME=$SECONDS

mkdir -p "$FOLDER"
cd "$FOLDER"

echo "dumping to: $FOLDER"

adb root
sleep 2

for part in $(adb shell "ls /dev/block/bootdevice/by-name/" | tr -d '\r'); do
    if [[ "$part" != "userdata" ]]; then
        echo "Pulling $part..."
        adb exec-out "su -c 'dd if=/dev/block/bootdevice/by-name/$part bs=4096 2>/dev/null'" > "$part.img"
    fi
done

cd ..

ELAPSED_TIME=$(($SECONDS - $START_TIME))
echo "dumped $VERSION to $FOLDER. took $(($ELAPSED_TIME / 60)) minutes and $(($ELAPSED_TIME % 60)) seconds."