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Ipad, Screenshots and Linux

larsmagne23

It’s become increasingly clear over the past few months that many recent, fun-sounding films from countries with smaller film industries will never get a physical DVD release. The only way to see these films is via Amazon Prime, and since Amazon Prime isn’t conveniently available on Linux machines, I’m having to use an Ipad to watch these films.

Which is fine.

But I have to take screenshots. (I mean. I have to!) That leaves a lot of images on the Ipad, and I need a convenient way to get those from the Ipad to my Linux laptop.

Now, there’s Dropbox, and… stuff, but all those things require some manual work at the Ipad end or the Linux end. I hate manual work.

So wouldn’t it be nice if there was some way to just “do something” and then all the screenshots from the Ipad would magically appear in my Emacs on the Linux laptop?

There is!

It’s a bit fiddly, though, so let’s just get started.  (“A bit fiddly” is code for “seven pages of text is to follow”.  This is the year of Linux on the Desktop.)

My Laptop runs Ubuntu Linux, and it comes with an ifuse distribution that’s built with GnuTLS and not OpenSSL. This doesn’t work with IOS 10, so you need to build it yourself.

I’ve streamlined the build instructions a bit. The utilities and libraries needed to talk to Idevices is spread over four repositories, but the following should pull them all down, build them, and install them under /usr/local.

#!/bin/bash 
sudo apt-get build-dep ifuse 
for elem in libusbmuxd libimobiledevice usbmuxd ifuse; do 
  git clone https://github.com/libimobiledevice/${elem}.git 
  (cd $elem; sh ./autogen.sh; make; sudo make install) 
done

Check that your path is picking up the correct version by saying

$ type ifuse 
ifuse is /usr/local/bin/ifuse

Then plug in the Ipad via USB, and test that you can talk to the device. You may have to press “Trust this device” on the Ipad while connecting.

$ sudo mkdir /media/ipad 
$ sudo chown larsi.users /media/ipad 
$ idevicepair pair SUCCESS: Paired with device 37b633350ab83dc815a6a97dcd6d327b12c41968 
$ ifuse /media/ipad

You should now have the Ipad mounted, and the screenshots are under /media/ipad/DCIM.

Now for the fun part: Make the laptop copy over the files automatically whenever you plug in the Ipad.  I’m using the general setup from the usb-automount setup I did a few months ago.

The main difference is this udev.rules file:

ATTR{idVendor}="05ac", ATTR{idProduct}="12ab", PROGRAM="/bin/systemd-escape -p --template=usb-automount@.service $env{DEVNAME}", ENV{SYSTEMD_WANTS}+="%c"

And then I use the following script to actually copy over the contents to the current “viewing directory”.

#!/bin/bash

command="$1"

if [ "$command" = "remove" ]; then
    umount /media/ipad
    exit
fi

# Mount the Ipad.
ifuse /media/ipad

if [ -d "/media/ipad/DCIM/100APPLE" ]; then
    cd /media/ipad/DCIM/100APPLE
    for pic in IMG*; do
        to="/home/larsi/pics/ipad"
        if [ ! -f "$to/$pic" ]; then
            cp -av "$pic" "$to/$pic"
            chown larsi.users "$to/$pic"
            if echo "$pic" | grep PNG > /dev/null; then
                shot=`echo "$pic" | sed 's/IMG_/shot/' | sed 's/PNG/png/'`
                if [ ! -f "/home/larsi/.movie-current/$shot" ]; then
                    ln "$to/$pic" "/home/larsi/.movie-current/$shot"
                fi
            fi
        fi
    done
fi

cd /
umount /media/ipad

Or something like that.  You obviously have to adjust the script to your needs if you want to do something like this, but the general idea should be sound, I think…

Look!  The images appeared in Emacs!  As if by magic!

It seems to work reliably, also after rebooting the laptop.  Apparently the “idevicepair pair” think only has to be done once?  Or something?

The only minor annoyance is that Ubuntu pops up an icon in the right-hand menu every time I plug in the Ipad.  Is there any way to say to Ubuntu “ignore this device in the UI”?  There is a way to make Ubuntu ignore all auto-mounted devices, but that’s not what I want, and there is a way to make Linux ignore a specific USB device completely (echo 0 > /sys/bus/usb/devices/2-1/authorized), but that’s not what I want, either.  I just want the UI to ignore this specific device…

Oh, never mind.

[Edit: I’ve now put the scripts on github.  That should make it easier to customize if anybody wants to use this setup…]

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