Resize PINN Partitions Using Gparted

[WCHD]

I am trying to resize the systems that I installed on my 256gb SD card using Gparted. I know how to resize the partitions, but I cannot tell which system is which, e.g. mmcblk0p7. Can somebody help me understand which one is which, if I quad-boot Raspbian, OSMC, RetroPie, and Arch2, and also reserved 3 ProjectSpaces?

[procount]

Have a look at /settings/installed_os.json ( on /dev/mmcblk0p5 )
It lists all OSes installed and the associated partitions.

To have greater control over the partition sizes when you install OSes, use pinn.mjh.nz

[WCHD]

I tried that before. It froze on the installer, and every single partition became visible through Windows Explorer (therefore with a billion popups about that a drive needs to be formatted)

[procount]

Windows does not understand Linux partitions and will produce a "billion popups" requesting you to reformat them regardless of whether you have resized them or not (always decline!).
I never tried resizing them myself, but if PINN freezes afterwards, then maybe gparted changed something it didn't like.
If partitions are referenced using PARTUUID, then make sure that gparted does not alter these, otherwise it will wait indefinitely for the correct partition to show up. In which case, you have some fixups to do.

If you can't get gparted to work, I suggest you start afresh using pinn.mjh.nz to specify the OS sizes you want. Backup your existing OSes first, if you want to keep what's on them. After re-installing, you can restore your backups into the correctly resized partitions. It's a bit more longwinded, but it will work.

[WCHD]

Can you explain how to do it without the website?

[procount]

The website is the easiest way.
Otherwise you'll have to download each OS to a memory stick, modify partitions.json for each OS, then install from USB.