Add Nix flake (WIP)

[jurraca]

This flake exposes a package and a devShell to develop on Cashu and build the binaries.
With flakes enabled, run nix build from project root.
Tested only on Linux.

currently the cryptography package throws an error on "BN_Add" symbol.

[callebtc]

The error you've showed was related to the bitcoin library in Cashu which is used for P2SH. I could imagine that we can remove that functionality and with it the entire library from the code base.

Should I do that in a separate branch and you can merge it into this branch?

[jurraca]

That works yes, thanks!

[callebtc]

The imports must remain relative otherwise the library can't be imported by other applications. There might also be pip package issues when nostr is fetched from its repo.

[callebtc]

That works yes, thanks!

done!

[callebtc]

I also moved the nostr client directly into the repo: #346

[jurraca]

OK, updated to use the new nostr setup. Rebased and squashed.

• Not sure if the poetry.lock updates here are useful are not, they were automatically generated.
• This builds the cashu binaries successfully on my machine. Could some mac folk (@chrisguida maybe?) test it as well?
• Starting the mint fails because it's looking for a tor PID in the directory, I'll look at this next.

[chrisguida]

I'll get to this in a week or so! Unfortunately traveling without my mac currently

[callebtc]

• Starting the mint fails because it's looking for a tor PID in the directory, I'll look at this next.

Any idea where this comes from? Nothing in the repo knows about PID files afaik....

[chrisguida]

just attempted nix build on my mac. seems a hash wasn't specified somewhere?

> nix build
trace: warning: Unknown cryptography version: '41.0.3'. Please update getCargoHash.
error: hash mismatch in fixed-output derivation '/nix/store/q5zdnqdvji51gldarqrnmvr76q50z8gk-cryptography-41.0.3-vendor.tar.gz.drv':
         specified: sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
            got:    sha256-LQu7waympGUs+CZun2yDQd2gUUAgyisKBG5mddrfSo0=
error: 1 dependencies of derivation '/nix/store/0mqas2hvyns7ipciy0c1mfcs9g4jkskm-python3.10-cryptography-41.0.3.drv' failed to build
error: 1 dependencies of derivation '/nix/store/wxr9qh49r05vhk6mkzm06nb85jqhnqm1-python3.10-cashu-0.14.0.drv' failed to build

[jurraca]

Any idea where this comes from?

not sure but it... disappeared

seems a hash wasn't specified somewhere?

We're avoiding specifying a hash by overriding cryptography with preferWheels = true so it doesn't try to do a fixed-output derivation. I can reproduce if i don't override the cryptography lib. It's basically this error. Maybe there's an extra mac thing to do?

[chrisguida]

Hmm ok, what's the workaround? Should I copy this hash somewhere?

[jurraca]

idk tbh. This works on linux, not sure why it fails for mac.

[callebtc]

Would love this to work on mac as I'm also one of those people!

[callebtc]

Could you guys add a git workflow that checks whether the flake works as the repo might get updated?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3e58670) 68.01% compared to head (93dfdf0) 67.97%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #335      +/-   ##
==========================================
- Coverage   68.01%   67.97%   -0.05%     
==========================================
  Files          63       63              
  Lines        4834     4834              
==========================================
- Hits         3288     3286       -2     
- Misses       1546     1548       +2     

see 1 file with indirect coverage changes

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