I'm very keen to have asdf-vm in my NixOS, so i tried out your patch rebased on current master. It installs fine, but i'm running into some issues perhaps you know about. This is running NixOS natively, so Linux, not macOS.

Firstly, it seems there's a dependency missing, because when i try to install Python as follows:

$ asdf plugin add python 
$ asdf install python 3.8.1 
.. lots of output ..
make: ar: No such file or directory

I was unable to find a related Nix package providing ar, maybe that's in coreutils? Anyway, perhaps that should be added as a runtime dependency? Or perhaps that's not the Nix way -- i'm still learning!

Secondly, i was able to install NodeJS as follows:

$ asdf plugin add nodejs
$ asdf install nodejs 12.18.3 
$ asdf shell nodejs 12.18.3
$ npm
/nix/store/gmkxfwl44lxfr9li8bk9f0qdr5xz8vpv-asdf-vm-0.7.8/asdf-vm/lib/commands/command-exec.bash: line 28: /home/paul/.asdf/installs/nodejs/12.18.3/bin/node: No such file or directory

What's really weird is that it seems Zsh is lying -- look at the following:

$ stat /home/paul/.asdf/installs/nodejs/12.18.3/bin/node
  File: /home/paul/.asdf/installs/nodejs/12.18.3/bin/node
  Size: 48646656  	Blocks: 95016      IO Block: 4096   regular file
Device: 1ch/28d	Inode: 1725141     Links: 1
Access: (0755/-rwxr-xr-x)  Uid: ( 1000/    paul)   Gid: (  100/   users)
Access: 2020-09-10 11:31:00.361520349 +1000
Modify: 2020-07-23 01:00:17.000000000 +1000
Change: 2020-09-10 11:27:41.101404973 +1000
 Birth: 2020-09-10 11:27:40.854411014 +1000

So it's definitely there 🤔 Here's what i do in my .zshrc to make asdf available:

asdf=$(nix-build --no-out-link '<nixpkgs>' -I nixpkgs=$HOME/nixpkgs -A asdf-vm)
if [[ -d $asdf ]]; then
	. "$asdf/asdf-vm/asdf.sh"
fi

Apologies for the long story, but i'm hoping somebody can help please 😄

As an update, installing binutils got me further with asdf install python 3.8.1, but next pip failed next saying it needs zlib. I wonder what would be the "Nix"y way of managing these dependencies?

Aha, in reference to my previous message where i couldn't figure out why i was getting no such file or directory while the file was definitely there, that was a case of very bad error reporting. For context see https://unix.stackexchange.com/questions/18061/why-does-sh-say-not-found-when-its-definitely-there. The thing is that a precompiled NodeJS binary was being downloaded which simply didn't work on NixOS, because of missing /lib/... that most Linuxes provide.

I managed to find a workaround to force asdf to recompile NodeJS which i hope will work. We'll see. The workaround was found here: https://unix.stackexchange.com/questions/18061/why-does-sh-say-not-found-when-its-definitely-there

@SuperSandro2000 Hi, thanks for your suggestion, sorry for the so late reply, I finally(😝) has time to fix my PR

I created a new PR just for fn-cli #124447 (And also very thanks @toothbrush, I will create a new PR for asdf-vm later and try to fix the problem you encountered), can you help me check my new PR?

Hi @toothbrush , I created another PR #124495 , can you please try again?