Change:
insync = callPackage ../applications/networking/insync { }; <ins> insync-v3 = libsForQt515.callPackage ../applications/networking/insync/v3.nix { }; </ins> libstrangle = callPackage ../tools/X11/libstrangle { stdenv = stdenv_32bit; };

Discussion:
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I'm not sure about the headless version, but I've got a working derivation for the GUI version of insync 3.0 that I need to push to nixpkgs. Would that work for you?
Yes, that would be even better! :)
Will this new GUI version also work without GUI? I run insync both on GUI and headless machines
I think the GUI version requires a GUI, unfortunately. When I add it I'll make sure to keep the existing headless insync available since the GUI one is not a direct replacement.
Thanks to tinywrkb, that helped me in the insync forums, I could get the headless version to work. It seems that the binary will not work unless its located at /usr/bin/insync-headless.

Therefore, I had to put it in an FHS, and as soon as I did that, it started to work. What's currently missing in my repo is a NixOS module with a service, tough.
I am currently trying (and failing) to get the GUI version of insync working - would you be able to provide a link or pastebin to what you have? Mine is at:
oh yeah I will try to get what I have up in a PR this afternoon! Sorry I forgot all about this since starting a new job recently.
Haven't forgotten, just delayed - getting to this soon.
Here we go: That's what was running on my nixos laptop as of a few weeks ago, but I don't have a way of testing it properly at the moment. Hopefully the derivation still works :-)
Thanks for publishing this! Sadly, it doesn't work for me. Running and does nothing. It does not even output an error message. I also had a similar problem when packaging the headless variant and the only solution was to put it into FHS (because, as found out by a user in the insync forums, the insync binaries check their install location).
Hmmm okay. I'm away from my nixos systems for the next few days, but when I get back I'll try to figure out what went wrong. It was definitely working on my laptop as of a few weeks ago.
This is what I'm using these days - hope it helps someone: I remember I changed a few things but can't remember what!
Your derivation works for me, thanks :)
not! It starts only the first time, when isn't there. The second time, it doesn't start.. :(
you still have a working insync derivation?
This is what I have currently but I'm seeing the same issue as it seems - it isn't starting for me. I haven't actually used it for a while but I'll have a look later and submit a PR for it once I have it working again. This should really be merged anyway (once working of course!)