How to setup a device

This is a complete tutorial on how you can setup a Nexus 5 (Android 5.1.0) 32GB to build your own phone cloud.

##Disclaimer It is your decision to follow this guide on your device. BareDroid team takes no responsibility for any damage that may occur from modifying the partitions on the device.

##Prerequisite

• Download and install the latest TWRP image file (.img) from the download link and boot TWRP
• Push the parted utility on the device (you can find a copy here) and make it executable
• umount /sdcard and /data partitions

##How to use parted parted is a program to manipulate disk partitions. It is useful for creating space for new operating systems, reorganizing disk usage, and copying data to new hard disks.

SYNOPSIS
parted [options] [device [command [options...]...]]

To run parted type the command:

./parted /dev/block/mmcblk0

The device /dev/block/mmcblk0 is where all the partitions of an Android device reside. To note that if you are using another device (e.g., Samsung S4) the name could be different.

If everything went well, a message like this appear:

Using /dev/block/mmcblk0
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted)

From the parted shell type m to show the menu. Type p to see all the partitions (the below information refers to Nexus 5):

Number	Start	End	Size	File system	Name
1	524kB	67.6MB	67.1MB	fat16	modem
2	67.6MB	68.7MB	1049kB		sbl1
3	68.7MB	69.2MB	524kB		rpm
4	69.2MB	69.7MB	524kB		tz
5	69.7MB	70.3MB	524kB		sdi
6	70.3MB	70.8MB	524kB		aboot
7	70.8MB	72.9MB	2097kB		pad
8	72.9MB	73.9MB	1049kB		sbl1b
9	73.9MB	74.4MB	524kB		tzb
10	74.4MB	75.0MB	524kB		rpmb
11	75.0MB	75.5MB	524kB		abootb
12	75.5MB	78.6MB	3146kB		modemst1
13	78.6MB	81.8MB	3146kB		modemst2
14	81.8MB	82.3MB	524kB		metadata
15	82.3MB	99.1MB	16.8MB		misc
16	99.1MB	116MB	16.8MB	ext4	persist
17	116MB	119MB	3146kB		imgdata
18	119MB	142MB	23.1MB		laf
19	142MB	165MB	23.1MB		boot
20	165MB	188MB	23.1MB		recovery
21	188MB	191MB	3146kB		fsg
22	191MB	192MB	524kB		fsc
23	192MB	192MB	524kB		ssd
24	192MB	193MB	524kB		DDR
25	193MB	1267MB	1074MB	ext4	system
26	1267MB	1298MB	31.5MB		crypto
27	1298MB	2032MB	734MB	ext4	cache
28	2032MB	31.3GB	29.3GB	ext4	userdata

To provide disposable roms we need to create a new userdata partition. The idea is to split the partition 28 to create two new partitions: (i) userdata and (ii) userdata_next.

The following steps can be used to split a partition, not copy and paste but try to understand...

1. delete the current userdata partition:
   rm 28

2. check whether the partition was deleted successfully:
   p free

3. create a new partition using the free space:
   (parted) mkpartfs 1 ext2 2032MB 15.7GB

mkpartfs creates a new partition of type PART-TYPE (first parameter) with a new file system of type FS-TYPE (second parameter) on it. The new partition will start START megabytes (third parameter), and end END megabytes (fourth parameter). To note that mkpartfs does not provide support for ext4 fs-type, just use ext2 and see step 7.

4. assign a name to the new partition:
   (parted) name 28 userdata

5. check whether the new partition was created successfully:
   p free

6. create the userdata_next partition:
   (parted) mkpartfs 1 ext2 15.7GB 29.4GB

7. assign a name to the new partition:
   (parted) name 29 userdata_next

8. create the store partition. It stores the initial snapshot of the userdata partition to speedup the restore process:
   (parted) mkpartfs 1 ext2 29.4GB 31.3GB

9. assign a name to the new partition:
   (parted) name 30 store

10. exit from parted:
    (parted) q

11. reboot the device in recovery mode

12. umount /sdcard and /data partitions

13. change the userdata and userdata_new fs-type from ext2 to ext4:
    make_ext4fs /dev/block/mmcblk0p28 /data
make_ext4fs /dev/block/mmcblk0p29 /data

14. reboot in bootloader mode and flash a clean image of the userdata partition, take it from here