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For the easy option / question - do you have bitlocker enabled? That’s not enough?
Do you want the encrypted folder to be automatically-unlocked or unlocked with a password
You can build your own Linux kernel for WSL, I haven’t done it and unless that sounds like fun to you that’s not the route I’d go.
Not sure if the Linux crowd can answer this Windows question.
I've read that systemd-homed can do encrypted home directories but I haven't tried it, much less on WSL but that may get you to achieve the encrypted home directory at least.
Personally I don't think I would have a need to encrypt all of WSL, but maybe that also makes sense for your case.
ArchWiki example: https://wiki.archlinux.org/title/Systemd-homed
I think this might be possible with WSL2, which is more of a VM type instance, but WSL1 has issues with kernel modules and some networking stuff due to how it integrates with Windows
Would it not be encrypted if you just encrypt your windows drive with bitlocker? Seems kinda redundant to double encrypt to me
Yes.
You'll just boot up into a blank home folder and a completely uncustomized bash (or whatever your default shell is).
After mounting you'll have to restart your shell or source your .${SHELL}rc
Ok, so via LUKS. Thanks