maemo.org - Talk - [HowTo][WIP] use real sdcard as home-partition and/or for android data

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[HowTo][WIP] use real sdcard as home-partition and/or for android data

Updated for Salfish >= 1.0.4

If you had it running before and problems after the last Update (1.0.4), you only need to do step 6!

First of all: this config is meant to be used with UNIX filesystems like ext4. There are also some suggestions for btrfs in this thread. I guess, it needs to be handled differently.
Second: i'm not sure, how it affects speed with slow sdcards, but i'd recommend using a real fast (and big) sdcard

Everything you do, you do at your own risk! I tried to write everything correct, but mistakes happen...

So, here we go:
x.a is always for using as home partition
x.b is always for android data

1. create new folder for custom mountpoint

Code:

devel-su

Code:

mkdir /mnt/sd

2. mount sdcard to that folder (assuming you have formatted as p1)

Code:

mount /dev/mmcblk1p1 /mnt/sd

3. create folders
3.a in the mounted sdcard create a hidden folder for home

Code:

mkdir /mnt/sd/.home

Code:

chown nemo:nemo /mnt/sd/.home

(home folder should be owned by nemo)
3.b in the mounted sdcard create a hidden folder for android

Code:

mkdir /mnt/sd/.android

Code:

chmod 777 /mnt/sd/.android

(android apps need right access)

4. sync new folders with your existing data
4.a sync home folder

Code:

rsync -a /home/nemo/ /mnt/sd/.home

4.b sync android folder (if you want)

Code:

rsync -a /data/sdcard/ /mnt/sd/.android

5. at this point, you could delete the old data stored on the device. i deletet only images and videos in home + android data.
i would not recommend to delete folders in home-folder, just the big files
of course you can also do this later, after some days of testing.

6. create out own bootscript
6.1. create a file mount-sd.custom.sh with this content:

Code:

#!/bin/bash



ACTION=$1



if [ "$ACTION" = "add" ]; then

  mount /dev/mmcblk1p1 /mnt/sd

  mount -o bind /mnt/sd/.home /home/nemo

  mount -o bind /mnt/sd/.android /data/sdcard

else

  umount /data/sdcard

  umount /home/nemo

  umount /mnt/sd

fi

and move it to /usr/sbin

Code:

cp mount-sd.custom.sh /usr/sbin/mount-sd.custom.sh

chown root:root /usr/sbin/mount-sd.custom.sh

chmod +x /usr/sbin/mount-sd.custom.sh

6.2. create a file mount-custom.service with this content:

Code:

[Unit]

Description=Handle custom sdcard

After=local-fs.target

RequiresMountsFor=/home



[Service]

Type=oneshot

RemainAfterExit=yes

ExecStart=/usr/sbin/mount-sd.custom.sh add

ExecStop=/usr/sbin/mount-sd.custom.sh remove



[Install]

WantedBy=multi-user.target

and move it to /lib/systemd/system

Code:

cp mount-custom.service /lib/systemd/system/mount-custom.service

chown root:root /lib/systemd/system/mount-custom.service

systemctl enable mount-custom.service

7. reboot your device and check, if everything is working as expected

Code:

df -h

should show something like this:

Code:

Filesystem            Size  Used Avail Use% Mounted on

rootfs                 14G  1.9G   12G  15% /

/dev/mmcblk0p28        14G  1.9G   12G  15% /

devtmpfs              406M   64K  406M   1% /dev

tmpfs                 407M  360K  406M   1% /dev/shm

tmpfs                 407M   28M  380M   7% /run

tmpfs                 407M     0  407M   0% /sys/fs/cgroup

tmpfs                 407M   20K  407M   1% /tmp

/dev/mmcblk0p19       8.0M  4.1M  3.9M  52% /drm

/dev/mmcblk0p9         48M  9.2M   39M  20% /var/systemlog

/dev/mmcblk0p28        14G  1.9G   12G  15% /swap

/dev/mmcblk0p28        14G  1.9G   12G  15% /home

/dev/mmcblk0p25       8.0M  4.2M  3.8M  54% /persist

/dev/mmcblk0p18        64M   45M   20M  70% /firmware

tmpfs                 407M     0  407M   0% /mnt/asec

tmpfs                 407M     0  407M   0% /mnt/obb

/dev/mmcblk1p1         60G  8.3G   49G  15% /mnt/sd

/dev/mmcblk1p1         60G  8.3G   49G  15% /home/nemo

/dev/mmcblk1p1         60G  8.3G   49G  15% /data/sdcard

/dev/mmcblk1p1         60G  8.3G   49G  15% /media/sdcard/4582345364s...

Q&A

Why do you put android data in a hidden folder?
Otherwise, my Gallery was full of map tiles. But if you like this, just remove the dot ;)

Why do you put home data in a hidden folder?
Otherwise, my Gallery showed every image twice. But if you like this, just remove the dot ;)

Quote:

Originally Posted by Leinad (Post 1407186)

So.....

the solution is really simple:
i created a folder /mnt/sdcard2/ (chmod 777)
then just mounted the sdcard the "traditional way" to that folder:

Code:

mount /dev/mmcblk1p1 /mnt/sdcard2/

then mounted the "real" sdcard on the android folder

Code:

mount -o bind /mnt/sdcard2 /data/sdcard/

... and that's it!
i added those two lines at the end of /usr/sbin/mount-sd.sh and it works without any problems (till now )
...

Don't forget to unmount on reboot or shutdown. Here an other cite:

http://talk.maemo.org/showpost.php?p=1404380

it uses a hidden directory and unmounts it on reboot - writes cached data.

Re: [HowTo] use sdcard for android apps

Thanks for the hint, i missed that!

I added the unmounting and also liked the idea of the hidden folder, because otherwise my gallery was full of map tiles :)

so i moved all android stuff to /mnt/sdcard2/.android and adapted the script.

also, i want my pictures and videos to be stored on the real sdcard, so i creadet the needed folder and added the mount (and unmounts).

i will update the first post.

Re: [HowTo] use sdcard for android apps

Quote:

Originally Posted by Leinad (Post 1407290)

Thanks for the hint, i missed that!

I added the unmounting and also liked the idea of the hidden folder, because otherwise my gallery was full of map tiles :)

...

Yes thats why I am using a hidden directory too. Your update looks good.