Every once in a while I kick the tires on vibe coding, for various reasons:
However, each time I try out vibe coding I'm unimpressed with the results. Don't get me wrong: I think vibe coding in its present state is pretty amazing and a cool tech demo but misses the mark as a software engineering tool.
I'll illustrate what I mean with a sample Claude Code session of mine. I picked Claude Code for my recent vibe coding trial because some of my coworkers and peers on social media were raving about it.
Over the weekend I was hacking on my Grace project (a domain-specific language for prompt engineering1) and one of the issues I was dealing with is that the Nix build for GHCJS was failing with this error after upgrading to Nixpkgs 24.11:
Setup: Missing dependency on a foreign library:
* Missing (or bad) header file: ghc/utils/unlit/fs.h
Moreover, the failure was not reproducible2. The build succeeded on one machine but failed on another. I could work around that by copying the cached build product from one machine to another, but I wanted to better understand what was going on to gauge the full extent of the reproducibility problem.
I began debugging and after about an hour I had a "solution" (more like a workaround). Then I stopped and realized that this would actually be a good real-world example for me to trial vibe coding on because this is the sort of problem I deal with on the regular (both professionally and in my open source projects). I also had my own work that I could benchmark vibe coding against.
So I subscribed to Claude Code Pro (for $17 / month), installed Claude Code, and fired it up in my terminal and began with this prompt:
I want to fix a build failure in my Nix configuration. To provide some context, this build does work on another machine, but for whatever reason doesn't work on this machine. Specifically the way to reproduce the build failure is to load the Nix shell by setting
.envrcto "use flake '.#ghcjs'" anddirenv reloador justnix build '.#website'.
… and then I let Claude run from there. The full session transcript is provided in the Appendix below, but my basic interaction policy was:
The only time I had to intervene was when Claude began to try to work around the issue by building for for x86_64-darwin instead of aarch64-darwin. My feedback was:
You don't need to run Rosetta. This build should definitely work on
aarch64-darwin. I know that it works on another machine and pushing on anx86_64-darwinbuild is a dead end.
For other stuff I generally let Claude's ideas "ride" to see if Claude would learn and adjust on his own and to gauge to what extent I could let Claude work unsupervised.
Unfortunately, Claude's first pass at the solution was not good, and I'll paste it here:
diff --git a/flake.nix b/flake.nix
index 465442e..957ca26 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,8 +16,59 @@
};
haskell = super.haskell // {
+ compiler = super.haskell.compiler // {
+ ghcjs =
+ let
+ originalGhcjs = super.haskell.compiler.ghcjs;
+ originalBootGhcjs = originalGhcjs.passthru.bootGhcjs;
+ emsdk = "/nix/store/rsd7naynyq6r8cry568r1widlzgxvqzg-emsdk";
+
+ # Patch bootGhcjs to fix the fs.h path issue
+ patchedBootGhcjs = originalBootGhcjs.overrideAttrs (bootOld: {
+ patches = (bootOld.patches or []) ++ [ ./ghcjs-fix-fs-header-path.patch ];
+ });
+ in
+ # The final GHCJS runs ghcjs-boot using bootGhcjs
+ originalGhcjs.overrideAttrs (final: prev: {
+ nativeBuildInputs = [ patchedBootGhcjs ] ++
+ (builtins.filter (x: x != originalBootGhcjs) prev.nativeBuildInputs);
+
+ # Rewrite buildPhase to use patched bootGhcjs
+ buildPhase = ''
+ export HOME=$TMP
+ mkdir $HOME/.cabal
+ touch $HOME/.cabal/config
+ cd lib/boot
+
+ mkdir -p $out/bin
+ mkdir -p $out/lib/ghcjs-8.10.7
+ lndir ${patchedBootGhcjs}/bin $out/bin
+ chmod -R +w $out/bin
+ rm $out/bin/ghcjs-boot
+ cp ${patchedBootGhcjs}/bin/ghcjs-boot $out/bin
+ rm $out/bin/haddock
+ cp ${patchedBootGhcjs}/bin/haddock $out/bin
+ cp ${patchedBootGhcjs}/bin/private-ghcjs-hsc2hs $out/bin/ghcjs-hsc2hs
+
+ wrapProgram $out/bin/ghcjs-boot --set ghcjs_libexecdir $out/bin
+
+ wrapProgram $out/bin/ghcjs --add-flags "-B$out/lib/ghcjs-8.10.7"
+ wrapProgram $out/bin/haddock --add-flags "-B$out/lib/ghcjs-8.10.7"
+ wrapProgram $out/bin/ghcjs-pkg --add-flags "--global-package-db=$out/lib/ghcjs-8.10.7/package.conf.d"
+ wrapProgram $out/bin/ghcjs-hsc2hs --add-flags "-I$out/lib/ghcjs-8.10.7/include --template=$out/lib/ghcjs-8.10.7/include/template-hsc.h"
+
+ env PATH=$out/bin:$PATH $out/bin/ghcjs-boot --with-emsdk=${emsdk} --no-haddock
+ '';
+ passthru = prev.passthru // {
+ bootGhcjs = patchedBootGhcjs;
+ };
+ });
+ };
+
packages = super.haskell.packages // {
"${compiler}" = super.haskell.packages."${compiler}".override (old: {
+ ghc = if compiler == "ghcjs" then self.haskell.compiler.ghcjs else old.ghc or null;
+
overrides =
let
hlib = self.haskell.lib;
diff --git a/ghcjs-fix-fs-header-path.patch b/ghcjs-fix-fs-header-path.patch
index 534bffc..ac19b29 100644
--- a/ghcjs-fix-fs-header-path.patch
+++ b/ghcjs-fix-fs-header-path.patch
@@ -1,19 +1,20 @@
-diff --git a/ghcjs.cabal b/ghcjs.cabal
-index 1234567..abcdefg 100644
--- a/ghcjs.cabal
+++ b/ghcjs.cabal
-@@ -43,7 +43,7 @@ library
- ghc/libraries/ghc-prim/cbits
- ghc/utils/fs
- ghc/rts
-- ghc/utils/unlit/fs.h
-+ ghc/utils/fs/fs.h
- GHC-Options: -Wall -fno-warn-orphans -fno-warn-name-shadowing -fno-warn-unused-do-bind -fprof-auto-calls -fobject-code
- if flag(disable-optimizer)
- cpp-options: -DDISABLE_OPTIMIZER
-@@ -916,4 +916,4 @@ executable ghcjs
- Main-Is: Main.hs
- Build-Depends: base, ghcjs
- Default-Language: Haskell2010
+@@ -43,7 +43,7 @@
+ ghc/includes/HsFFI.h
+ ghc/includes/Cmm.h
+ ghc/includes/stg/*.h
+- ghc/utils/unlit/fs.h
++ ghc/utils/fs/fs.h
+ ghc/driver/utils/cwrapper.h
+ ghc/driver/utils/getLocation.h
+ utils/wrapper/getline.h
+@@ -916,7 +916,7 @@
+ hs-source-dirs: ghc/utils/unlit
+ Main-Is: unlit.c
+ C-Sources: ghc/utils/unlit/fs.c
- Includes: ghc/utils/unlit/fs.h
+ Includes: ghc/utils/fs/fs.h
+
+ Executable private-ghcjs-touchy
+ if flag(compiler-only) || !os(Windows)This is pretty poor software engineering (I'll explain why in the next section), but I wanted to give Claude a chance to redeem himself so I started to get more hands on once I knew that Claude wasn't really cut out for "fire and forget" operation. However, I still avoided using my prior research and only gave feedback based on what Claude had gathered, learned, and presented to me.
First, I asked Claude to improve upon his solution:
So there are a few issues with this solution: (A) you shouldn't have hardcoded
/nix/storepaths (like/nix/store/rsd…-emdsk) and (B) you shouldn't copy/paste/edit thebuildPhase(because that will lead to configuration drift if I, say, upgrade Nixpkgs)
… and then Claude went down a bad route (trying to use string replacement instead, which is also not good practice) so I proactively intervened again so that Claude wouldn't struggle going down that route:
❯ String replacement is also not an idiomatic Nix solution to the problem. Typically the right way to do these sorts of things is a well-placed
.override(…)or.overrideAttrs(…)or similar
… and then Claude chugged on that for a while and eventually ran out of tokens for the day (because I was using the Pro plan and not the Max plan). This was after a ≈1 hour long session with Claude; I could upgrade to Claude Code Max which would give me ≈20× the pro plan so I could … spend a lot more money ($200 / month!) and time to teach Claude how to do a better job.
Needless to say I wasn't impressed. If I wanted to spend time and money on mentoring a junior engineer I'd rather spend that on teaching a human how to be a better software engineer3.
I want to break down why Claude's solution was poor engineering because to an untrained eye it might seem like an acceptable solution to the problem. However, LLMs are notorious for generating solutions/ideas that seem good at first glance but then fall apart under scrutiny.
The first issue is: Claude's solution is not reproducible at all on other machines. In fact, it's not even necessarily reproducible on my own machine: Claude's solution will eventually stop working on my machine the first time I run a Nix garbage collection.
This is because Claude hard-codes the /nix/store/rsd7naynyq6r8cry568r1widlzgxvqzg-emsdk Nix store path, which is a big no-no in Nix4 for the reason I just mentioned (profound lack of reproducibility, even local reproducibility).
The other issue with the solution is that Claude couldn't figure out how to idiomatically patch the ghcjs build so Claude resorted to a big hack to work around its lack of knowledge:
+ buildPhase = ''
+ export HOME=$TMP
+ mkdir $HOME/.cabal
+ touch $HOME/.cabal/config
+ cd lib/boot
+
+ mkdir -p $out/bin
+ mkdir -p $out/lib/ghcjs-8.10.7
+ lndir ${patchedBootGhcjs}/bin $out/bin
+ chmod -R +w $out/bin
+ rm $out/bin/ghcjs-boot
+ cp ${patchedBootGhcjs}/bin/ghcjs-boot $out/bin
+ rm $out/bin/haddock
+ cp ${patchedBootGhcjs}/bin/haddock $out/bin
+ cp ${patchedBootGhcjs}/bin/private-ghcjs-hsc2hs $out/bin/ghcjs-hsc2hs
+
+ wrapProgram $out/bin/ghcjs-boot --set ghcjs_libexecdir $out/bin
+
+ wrapProgram $out/bin/ghcjs --add-flags "-B$out/lib/ghcjs-8.10.7"
+ wrapProgram $out/bin/haddock --add-flags "-B$out/lib/ghcjs-8.10.7"
+ wrapProgram $out/bin/ghcjs-pkg --add-flags "--global-package-db=$out/lib/ghcjs-8.10.7/package.conf.d"
+ wrapProgram $out/bin/ghcjs-hsc2hs --add-flags "-I$out/lib/ghcjs-8.10.7/include --template=$out/lib/ghcjs-8.10.7/include/template-hsc.h"
+
+ env PATH=$out/bin:$PATH $out/bin/ghcjs-boot --with-emsdk=${emsdk} --no-haddock
+ '';I happen to know (because of my own research on the problem) that Claude didn't thoughtfully craft that code; Claude copied/pasted/edited that code from here.
That's not good software engineering practice because if the upstream buildPhase changes the copy that Claude vendored in my flake.nix file won't pick up any of those changes. Moreover, it means that the derivation is highly likely to break when I upgrade (in the same way that pinning or vendoring a dependency tends to break upgrades). Again, this is the sort of issue that seems okay in the short-term but then causes issues in the long-term.
A much more direct way to do what Claude was trying to do would have been something like this:
diff --git a/flake.nix b/flake.nix
index 465442e..f10cb22 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,6 +16,19 @@
};
haskell = super.haskell // {
+ compiler = super.haskell.compiler // {
+ ghcjs810 = super.haskell.compiler.ghcjs810.override (old: {
+ ghcjsDepOverrides = self: super: {
+ ghcjs = super.ghcjs.overrideAttrs (old: {
+ postPatch = (old.postPatch or "") +
+ ''
+ ./utils/makePackages.sh copy
+ '';
+ });
+ };
+ });
+ };
+
packages = super.haskell.packages // {
"${compiler}" = super.haskell.packages."${compiler}".override (old: {
overrides =However, I know from my own debugging that neither Claude's solution nor that simpler equivalent actually fix the problem (it just delays the build failure to a new build failure that surfaces later). I'll cover the real problem and the fix in the next section.
I don't expect Claude to be perfect, but what I would have liked to see is for Claude to recognize that this code was brittle/unmaintainable and stopped and asked for my input/guidance before powering through with that approach. For example, Claude could have said "The solution I have in mind might not be maintainable for X, Y, and Z reasons. Are you okay with that? I might exhaust my token budget if I push on better solutions".
The bigger issue, though, is that someone unfamiliar with Nix could be misled into thinking that this solution was acceptable or even impressive! It "works" … until it doesn't. This is why I'm pretty skeptical of claims that vibe coding "levels up" people who are working in unfamiliar territory because they might not necessarily be qualified to understand the implications/tradeoffs/downsides of LLM-generated code (and vibe coding solutions don't seem to have gotten to the point where they're good at recognizing and communicating those tradeoffs). Every time I vibe code in an area within my own expertise I'm unimpressed with the results, which makes me highly skeptical that vibe coding does the right thing when I'm operating outside my comfort zone5.
The actual cause of the build failure is a known issue in Nixpkgs which has a draft pull request open to address. Specifically:
gcc -E preprocessing command was unexpectedly failinggcc has duplicate LC_RPATH entriesThe workaround I used was to run and cache the build using my existing Garnix CI (which runs on an older version of macOS which doesn't have this issue). This is still not ideal from a reproducibility standpoint, but this is about as reproducible as Darwin builds get in the Nixpkgs ecosystem. The best possible fix would be to take the above draft pull request across the line. An intermediate solution would be to change the gcc -E step to use a different C preprocessor (e.g. clang) just for that one failing command.
This example is pretty representative of my experiences using vibe coding. Every time I try out vibe coding for real (and not for demos) I start out feeling hopeful and excited and leave feeling let down and disappointed. I don't want to produce throwaway code: I want to build things that will last and won't blow up in my face later and I don't want to handhold/babysit/cajole the tool to get the results I want. I want vibe coding to improve the quality of my work, not deteriorate it.
I understand that's not how vibe coding is marketed by proponents. To quote Andrej Karpathy, the uh "vibe" of vibe coding is to:
… fully give in to the vibes, embrace exponentials, and forget that the code even exists
… and that might work fine for tiny projects, but that doesn't really scale to projects of even a modest size or scope.
I don't think vibe coding is worthless and I do think the vibe coding experience can improve and has potential but vibe coding in its current incarnation is not the superhuman fantasy-land technology that some proponents make it out to be.
You also don't have to take my word for it: you can run this same experiment yourself. If you have Nix installed on macOS you can check out this branch of my Grace repository and ask your favorite vibe coding tool to fix the build failure and see what quality of solution you get.
Here's first part of the Claude Code session (before compaction):
❯ I want to fix a build failure in my Nix configuration. To provide some context, this build *does* work on another machine, but for whatever reason doesn't work on this
machine. Specifically the way to reproduce the build failure is to load the Nix shell by setting `.envrc` to "use flake '.#ghcjs'" and `direnv reload` or just `nix build
'.#website'`.
⏺ Let me first look at the relevant configuration files and then try to reproduce the build failure to see the error.
⏺ Searched for 1 pattern, read 2 files (ctrl+o to expand)
⏺ Bash(nix build '.#website' 2>&1)
⎿ Error: Exit code 1
warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
these 140 derivations will be built:
/nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv
/nix/store/xx1yiickzc9335ifff65dmmjvsvr10c1-ghcjs-8.10.7.drv
/nix/store/c81yjny8ir20408xil95yb7x5kffalac-transformers-compat-0.7.2.drv
/nix/store/04j7vshi110axixv7wvhjhx7wj844hnr-mmorph-1.2.0.drv
/nix/store/law97if38x4v8qqvxbrqa8bpa4h63n86-base-orphans-0.9.2.drv
… +134 lines (ctrl+o to see all)
⏺ The build is failing when building GHCJS 8.10.7. Let me get the full logs to see what library is missing.
⏺ Bash(nix log /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv 2>&1 | tail -100)
⎿ depends xhtml-3000.2.2.1
definite ghcjs-8.10.7-BXpCZpwU6DR6Oz73ZBQ9TO-ghcjs-boot
depends Cabal-3.2.1.0
… +96 lines (ctrl+o to expand)
⏺ The error shows a missing header file ghc/utils/unlit/fs.h. This looks like a build system issue with GHCJS on this platform. Let me check the system details and the flake.lock
to understand the environment better.
⏺ Bash(uname -m && sw_vers 2>/dev/null || cat /etc/os-release 2>/dev/null || true)
⎿ arm64
ProductName: macOS
ProductVersion: 26.2
BuildVersion: 25C56
⏺ Read 1 file (ctrl+o to expand)
⏺ This is on Apple Silicon (arm64) with macOS 26.2. The issue is that GHCJS is failing to build from source because it can't find the header ghc/utils/unlit/fs.h. This is a known
issue with building GHCJS on newer macOS/Apple Silicon.
Let me check if the garnix cache has pre-built binaries that could be used instead of building from source.
⏺ Bash(nix path-info --json '.#website' 2>&1 | head -50 || true)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +47 lines (ctrl+o to expand)
⏺ Bash(nix eval '.#packages.aarch64-darwin.website' --json 2>&1 | head -20 || true)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
"/nix/store/fgvv390bs8ldz5nl1zlh22kr7a0pccsl-try-grace"
⏺ The website package exists but there's no cached binary available, so it needs to build GHCJS from source. The problem is that GHCJS doesn't build properly on Apple Silicon
(aarch64-darwin).
Let me check if this machine can use Rosetta 2 to run x86_64 builds instead.
⏺ Bash(nix show-config | grep -E "system|extra-platforms")
⎿ extra-platforms = x86_64-darwin
system = aarch64-darwin
system-features = apple-virt benchmark big-parallel hvf nixos-test
⏺ Bash(/usr/bin/arch -x86_64 /bin/echo "Rosetta works" 2>&1)
⎿ Interrupted · What should Claude do instead?
❯ You don't need to run Rosetta. This build should definitely work on `aarch64-darwin`. I know that it works on another machine and pushing on an `x86_64-darwin` build is a
dead end.
⏺ You're right, let me focus on why the garnix cache isn't providing the pre-built binary. The build should be fetching from the cache rather than building locally.
⏺ Bash(nix store ping --store https://cache.garnix.io 2>&1)
⎿ Store URL: https://cache.garnix.io
⏺ Bash(nix path-info --store https://cache.garnix.io /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7 2>&1)
⎿ Error: Exit code 1
don't know how to build these paths:
/nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7
error: path '/nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7' is not valid
⏺ The garnix cache doesn't have this specific derivation hash. The derivation hash is calculated from inputs, so something is different on this machine. I noticed the "Git tree is
dirty" warning - let me check if the dirty files are affecting the derivation.
⏺ Bash(git status --porcelain)
⎿ M .envrc
?? docs/
?? openai.key
?? prompts/cunning.md
⏺ The prompts/cunning.md file is untracked, and the flake copies ./prompts/ into the website. This changes the derivation hash since the source contents are different.
Let me verify this is the cause by checking if the prompts directory is used in the build chain for GHCJS.
⏺ Bash(git stash --include-untracked -m "temp stash for nix build test" && nix path-info --json '.#website' 2>&1 | head -5; git stash pop)
⎿ Saved working directory and index state On main: temp stash for nix build test
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +19 lines (ctrl+o to expand)
⎿ (timeout 2m)
⏺ The derivation hash is the same even with a clean tree, so the dirty files aren't affecting the GHCJS derivation. The issue is that this specific derivation isn't cached at
garnix.
Let me check what GHCJS versions garnix has cached, and compare with what this flake is requesting.
⏺ Bash(nix derivation show /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv 2>/dev/null | head -80)
⎿ {
"/nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv": {
"args": [
… +127 lines (ctrl+o to expand)
⏺ Let me check the GHCJS source that's being used in the build.
⏺ Searched for 1 pattern, read 1 file (ctrl+o to expand)
⏺ Found it. The header is at ghc/utils/fs/fs.h but the error says it's looking for ghc/utils/unlit/fs.h. Let me check if this is a configuration issue in the GHCJS cabal file.
⏺ Searched for 2 patterns (ctrl+o to expand)
⏺ There's the bug. The ghcjs.cabal references ghc/utils/unlit/fs.h but the actual file is at ghc/utils/fs/fs.h. Let me verify the actual directory structure.
⏺ Read 3 files (ctrl+o to expand)
⏺ The file structure is confirmed: fs.h is in ghc/utils/fs/ but the cabal file references ghc/utils/unlit/fs.h. Let me check how this GHCJS source is configured in nixpkgs.
⏺ Bash(nix derivation show /nix/store/bzbhyxvbqlj0wsn7hxwv3ppjwg9l8947-configured-ghcjs-src.drv 2>/dev/null | head -100)
⎿ (No content)
⏺ Bash(nix-store -q --deriver /nix/store/bzbhyxvbqlj0wsn7hxwv3ppjwg9l8947-configured-ghcjs-src 2>&1)
⎿ /nix/store/6v281k29a2ba91g2xp3pafs62lqnn7ab-configured-ghcjs-src.drv
⏺ Bash(nix derivation show /nix/store/6v281k29a2ba91g2xp3pafs62lqnn7ab-configured-ghcjs-src.drv 2>&1 | head -150)
⎿ warning: The interpretation of store paths arguments ending in `.drv` recently changed. If this command is now failing try again with '/nix/store/6v281k29a2ba91g2xp3pafs62
lqnn7ab-configured-ghcjs-src.drv^*'
{
… +150 lines (ctrl+o to expand)
⏺ I found the issue. The ghcjs.cabal references ghc/utils/unlit/fs.h but the file is actually at ghc/utils/fs/fs.h. This is a bug in the GHCJS package configuration.
The build works on another machine likely because:
1. That machine has cached binaries from a previous successful build, or
2. It's using a different nixpkgs version
Let me check if updating the flake inputs might fix this.
⏺ Bash(nix flake lock --update-input nixpkgs 2>&1 && nix build '.#website' --dry-run 2>&1 | head -30)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +30 lines (ctrl+o to expand)
⏺ Let me revert that and instead fix the issue by patching GHCJS. The fix is to correct the path in ghcjs.cabal from ghc/utils/unlit/fs.h to ghc/utils/fs/fs.h.
⏺ Bash(git checkout flake.lock 2>&1)
⎿ Updated 0 paths from the index
⏺ Let me check how nixpkgs configures GHCJS so I can add a patch to fix this.
⏺ Bash(nix eval --json 'nixpkgs#haskell.packages.ghcjs.ghc.meta.position' 2>&1 || echo "Not available")
⎿ error:
… while calling the 'throw' builtin
… +9 lines (ctrl+o to expand)
⏺ Bash(nix-instantiate --eval -E 'with import <nixpkgs> {}; builtins.attrNames haskell.packages' 2>/dev/null | tr ',' '\n' | grep -i ghcjs || echo "Looking in a differ…)
⎿ [ "ghc810" "ghc8107" "ghc8107Binary" "ghc865Binary" "ghc90" "ghc902" "ghc910" "ghc9101" "ghc92" "ghc924Binary" "ghc925" "ghc926" "ghc927" "ghc928" "ghc94" "ghc945" "ghc946
" "ghc947" "ghc948" "ghc96" "ghc963" "ghc963Binary" "ghc964" "ghc965" "ghc966" "ghc98" "ghc981" "ghc982" "ghcHEAD" "ghcjs" "ghcjs810" "integer-simple" "native-bignum" ]
⏺ Fetch(https://raw.githubusercontent.com/NixOS/nixpkgs/24.05/pkgs/development/compilers/ghcjs/8.10/default.nix)
⎿ Received 3.5KB (200 OK)
⏺ Fetch(https://raw.githubusercontent.com/NixOS/nixpkgs/24.05/pkgs/development/compilers/ghcjs/8.10/configured-ghcjs-src.nix)
⎿ Received 1.8KB (200 OK)
⏺ Searched for 1 pattern (ctrl+o to expand)
⏺ Now I need to add a fix to the flake.nix. The cleanest approach is to override the GHCJS compiler package to fix the path in ghcjs.cabal. Let me check the current overlay
structure to understand how to add this fix.
⏺ Read 1 file (ctrl+o to expand)
⏺ I need to add an override for the GHCJS compiler itself in the overlay. The fix is to patch the ghcjs.cabal file to use the correct path. Let me add this to the flake.nix.
⏺ Update(flake.nix)
⎿ Added 11 lines
10 outputs = { garnix-lib, nixpkgs, utils, self }:
11 let
12 overlay = compiler: self: super: {
13 + haskell = super.haskell // {
14 + compiler = super.haskell.compiler // {
15 + ghcjs = super.haskell.compiler.ghcjs.overrideAttrs (old: {
16 + postPatch = (old.postPatch or "") + ''
17 + # Fix incorrect path for fs.h in ghcjs.cabal
18 + sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' ghcjs.cabal
19 + '';
20 + });
21 + };
22 + };
23 +
24 codemirror = self.fetchzip {
25 url = "https://codemirror.net/5/codemirror.zip";
26 sha256 = "sha256-TS4JVTRIwdWj/CihELhhC3Rte9DT0Tv239eZKR6MT6w=";
⏺ Wait, this creates a conflict since haskell is defined again later. Let me fix this by merging the definitions properly.
⏺ Read 1 file (ctrl+o to expand)
⏺ I need to merge the two haskell definitions. Let me fix this.
⏺ Update(flake.nix)
⎿ Added 5 lines, removed 7 lines
10 outputs = { garnix-lib, nixpkgs, utils, self }:
11 let
12 overlay = compiler: self: super: {
13 + codemirror = self.fetchzip {
14 + url = "https://codemirror.net/5/codemirror.zip";
15 + sha256 = "sha256-TS4JVTRIwdWj/CihELhhC3Rte9DT0Tv239eZKR6MT6w=";
16 + };
17 +
18 haskell = super.haskell // {
19 compiler = super.haskell.compiler // {
20 ghcjs = super.haskell.compiler.ghcjs.overrideAttrs (old: {
...
24 '';
25 });
26 };
22 - };
27
24 - codemirror = self.fetchzip {
25 - url = "https://codemirror.net/5/codemirror.zip";
26 - sha256 = "sha256-TS4JVTRIwdWj/CihELhhC3Rte9DT0Tv239eZKR6MT6w=";
27 - };
28 -
29 - haskell = super.haskell // {
28 packages = super.haskell.packages // {
29 "${compiler}" = super.haskell.packages."${compiler}".override (old: {
30 overrides =
⏺ Let me verify the fix is correct and test the build.
⏺ Read 1 file (ctrl+o to expand)
⏺ The structure looks correct. Let me test if the build works now.
⏺ Bash(nix build '.#website' 2>&1 | head -50)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +47 lines (ctrl+o to expand)
⎿ (timeout 5m)
⏺ The derivation hash hasn't changed, meaning my override isn't affecting the GHCJS compiler correctly. Let me check how the GHCJS package set uses the compiler.
⏺ Bash(nix eval --json '.#packages.aarch64-darwin.website.drvPath' 2>&1)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
"/nix/store/3b7npm9f6lq8bml1q3xv0p1jcmp5ymwn-try-grace.drv"
⏺ Bash(nix repl --expr 'builtins.getFlake (toString ./.)' 2>&1 <<'EOF'
:p packages.aarch64-darwin.website.meta or "no meta"…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Loading installable ''...
… +6 lines (ctrl+o to expand)
⏺ Let me check how the GHCJS package set uses the compiler. The issue is that haskell.packages.ghcjs has its own compiler that needs to be overridden differently.
⏺ Bash(nix repl 2>&1 <<'EOF'
:l <nixpkgs>…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Failed tcsetattr(TCSADRAIN): Inappropriate ioctl for device
… +9 lines (ctrl+o to expand)
⏺ I see - both haskell.packages.ghcjs.ghc and haskell.compiler.ghcjs point to the same derivation. But my override isn't flowing through correctly. Let me try overriding the ghc
within the package set override.
⏺ Read 1 file (ctrl+o to expand)
⏺ I need to pass the patched compiler directly to the package set override. Let me update the flake.nix to do this correctly.
⏺ Update(flake.nix)
⎿ Added 10 lines, removed 9 lines
16 };
17
18 haskell = super.haskell // {
19 - compiler = super.haskell.compiler // {
20 - ghcjs = super.haskell.compiler.ghcjs.overrideAttrs (old: {
21 - postPatch = (old.postPatch or "") + ''
22 - # Fix incorrect path for fs.h in ghcjs.cabal
23 - sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' ghcjs.cabal
24 - '';
25 - });
26 - };
27 -
19 packages = super.haskell.packages // {
20 "${compiler}" = super.haskell.packages."${compiler}".override (old: {
21 + ghc = if compiler == "ghcjs" then
22 + super.haskell.compiler.ghcjs.overrideAttrs (ghcOld: {
23 + postPatch = (ghcOld.postPatch or "") + ''
24 + # Fix incorrect path for fs.h in ghcjs.cabal
25 + sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' ghcjs.cabal
26 + '';
27 + })
28 + else
29 + old.ghc or super.haskell.packages."${compiler}".ghc;
30 +
31 overrides =
32 let
33 hlib = self.haskell.lib;
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -20)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +17 lines (ctrl+o to expand)
⎿ (timeout 2m)
⏺ Progress! I see a new derivation hash (43vzxkz71qziwf1vnajyadr03za8hnp9-ghcjs-8.10.7) but the old one is still there too. Let me check if the build succeeds now.
⏺ Bash(nix build '.#website' 2>&1)
⎿ Error: Exit code 1
warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
these 140 derivations will be built:
/nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv
/nix/store/43vzxkz71qziwf1vnajyadr03za8hnp9-ghcjs-8.10.7.drv
/nix/store/5y6xc4c874qzlhyqi0i08ypmkcpa498m-base-orphans-0.9.2.drv
/nix/store/4sk5j9hyb5wvd37hny8wx6bjk56hyadg-ghc-bignum-1.0.drv
/nix/store/8897xvkrcmm8ipj9h73pjdmn3hlyf3m6-data-array-byte-0.1.0.1.drv
… +135 lines (ctrl+o to see all)
⏺ The patched GHCJS depends on the unpatched GHCJS - this is the bootstrap problem. GHCJS builds itself using another copy. I need to patch the configured-ghcjs-src derivation
which is used by both stages.
⏺ Bash(nix derivation show /nix/store/43vzxkz71qziwf1vnajyadr03za8hnp9-ghcjs-8.10.7.drv 2>/dev/null | grep "1d66a8himxb4ys2r7wska88ghwkagdk1" | head -5)
⎿ "/nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv": {
⏺ I need to patch the shared source (configured-ghcjs-src), not the final compiler. Let me restructure the fix.
⏺ Bash(nix eval --raw '(with import <nixpkgs> {}; haskell.compiler.ghcjs.src.name or "checking...")' 2>&1)
⎿ Error: Exit code 1
error: '(with import <nixpkgs> {}; haskell.compiler.ghcjs.src.name or "checking...")' is not a valid URL
⏺ Bash(nix repl 2>&1 <<'EOF'
:l <nixpkgs>…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Failed tcsetattr(TCSADRAIN): Inappropriate ioctl for device
… +6 lines (ctrl+o to expand)
⏺ Bash(nix derivation show /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv 2>/dev/null | grep -E '"src"|"configured-ghcjs"' | head -5)
⎿ "src": "/nix/store/bzbhyxvbqlj0wsn7hxwv3ppjwg9l8947-configured-ghcjs-src/",
⏺ I see - there are two GHCJS builds: the boot compiler and the final compiler. I need to patch haskell.compiler.ghcjs at the top level so it affects the boot process too.
⏺ Read 1 file (ctrl+o to expand)
⏺ I need to override haskell.compiler.ghcjs at the overlay level so the patched version is used everywhere. Let me restructure this.
⏺ Update(flake.nix)
⎿ Added 9 lines, removed 10 lines
16 };
17
18 haskell = super.haskell // {
19 + compiler = super.haskell.compiler // {
20 + ghcjs = super.haskell.compiler.ghcjs.overrideAttrs (ghcOld: {
21 + postPatch = (ghcOld.postPatch or "") + ''
22 + # Fix incorrect path for fs.h in ghcjs.cabal
23 + sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' ghcjs.cabal
24 + '';
25 + });
26 + };
27 +
28 packages = super.haskell.packages // {
29 "${compiler}" = super.haskell.packages."${compiler}".override (old: {
21 - ghc = if compiler == "ghcjs" then
22 - super.haskell.compiler.ghcjs.overrideAttrs (ghcOld: {
23 - postPatch = (ghcOld.postPatch or "") + ''
24 - # Fix incorrect path for fs.h in ghcjs.cabal
25 - sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' ghcjs.cabal
26 - '';
27 - })
28 - else
29 - old.ghc or super.haskell.packages."${compiler}".ghc;
30 -
30 overrides =
31 let
32 hlib = self.haskell.lib;
⏺ Let me also ensure the package set uses the patched compiler from self instead of super.
⏺ Read 1 file (ctrl+o to expand)
⏺ Update(flake.nix)
⎿ Added 2 lines
27
28 packages = super.haskell.packages // {
29 "${compiler}" = super.haskell.packages."${compiler}".override (old: {
30 + ghc = if compiler == "ghcjs" then self.haskell.compiler.ghcjs else old.ghc or null;
31 +
32 overrides =
33 let
34 hlib = self.haskell.lib;
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -20)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +17 lines (ctrl+o to expand)
⎿ (timeout 2m)
⏺ The bootstrap compiler is still using the old source. The configured-ghcjs-src is shared by both. Let me try a different approach - instead of patching in postPatch, I'll create
a symlink in preConfigure to make the expected path work.
⏺ Update(flake.nix)
⎿ Added 4 lines, removed 2 lines
18 haskell = super.haskell // {
19 compiler = super.haskell.compiler // {
20 ghcjs = super.haskell.compiler.ghcjs.overrideAttrs (ghcOld: {
21 - postPatch = (ghcOld.postPatch or "") + ''
22 - # Fix incorrect path for fs.h in ghcjs.cabal
21 + preConfigure = (ghcOld.preConfigure or "") + ''
22 + # Fix incorrect path for fs.h in ghcjs.cabal - create symlink for compatibility
23 + ln -sf ../fs/fs.h ghc/utils/unlit/fs.h || true
24 + # Also fix the cabal file directly in case symlink doesn't work
25 sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' ghcjs.cabal
26 '';
27 });
⏺ Bash(nix derivation show /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv 2>/dev/null | grep -E '"ghcjs|"buildCommand|"buildPhase"' | head -10)
⎿ "buildPhase": "runHook preBuild\n./Setup build \nrunHook postBuild\n",
"name": "ghcjs-8.10.7",
"pname": "ghcjs",
"name": "ghcjs-8.10.7",
⏺ Bash(diff <(nix derivation show /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv 2>/dev/null | head -100) <(nix derivation show /nix/store/43vzxkz71qziwf…)
⎿ 2c2
< "/nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv": {
---
… +81 lines (ctrl+o to expand)
⏺ Now I understand. There are two stages:
1. First: Compiles GHCJS from source with ./Setup build - this is failing
2. Second: Runs ghcjs-boot using the first - this is what I was patching
The first one is the actual build that needs the fix. Let me check how to override it.
⏺ Bash(nix repl 2>&1 <<'EOF'
:l <nixpkgs>…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Failed tcsetattr(TCSADRAIN): Inappropriate ioctl for device
… +9 lines (ctrl+o to expand)
⏺ Fetch(https://raw.githubusercontent.com/NixOS/nixpkgs/24.05/pkgs/development/compilers/ghcjs/8.10/stage0.nix)
⎿ Received 3KB (200 OK)
⏺ Fetch(https://raw.githubusercontent.com/NixOS/nixpkgs/24.05/pkgs/development/compilers/ghcjs/8.10/default.nix)
⎿ Received 3.5KB (200 OK)
⏺ The bootGhcjs in passthru is what needs patching. It's built from stage0.nix. Let me try overriding the configuredSrc in the GHCJS passthru.
⏺ Bash(nix repl 2>&1 <<'EOF'
pkgs = import (builtins.getFlake "github:NixOS/nixpkgs/24.05").outPath {}…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Failed tcsetattr(TCSADRAIN): Inappropriate ioctl for device
… +8 lines (ctrl+o to expand)
⏺ Now I understand the structure. The bootGhcjs is the failing derivation, and it uses configuredSrc. Let me try to patch configuredSrc directly by overriding it in the overlay.
⏺ Update(flake.nix)
⎿ Added 27 lines, removed 8 lines
17
18 haskell = super.haskell // {
19 compiler = super.haskell.compiler // {
20 - ghcjs = super.haskell.compiler.ghcjs.overrideAttrs (ghcOld: {
21 - preConfigure = (ghcOld.preConfigure or "") + ''
22 - # Fix incorrect path for fs.h in ghcjs.cabal - create symlink for compatibility
23 - ln -sf ../fs/fs.h ghc/utils/unlit/fs.h || true
24 - # Also fix the cabal file directly in case symlink doesn't work
25 - sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' ghcjs.cabal
26 - '';
27 - });
20 + ghcjs =
21 + let
22 + # Patch the configured source to fix the fs.h path issue
23 + patchedConfiguredSrc = super.haskell.compiler.ghcjs.passthru.configuredSrc.overrideAttrs (srcOld: {
24 + buildCommand = srcOld.buildCommand + ''
25 + # Fix incorrect path for fs.h in ghcjs.cabal
26 + sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' $out/ghcjs.cabal
27 + '';
28 + });
29 +
30 + # Patch bootGhcjs to use the patched source
31 + patchedBootGhcjs = super.haskell.compiler.ghcjs.passthru.bootGhcjs.overrideAttrs (bootOld: {
32 + src = patchedConfiguredSrc;
33 + });
34 + in
35 + super.haskell.compiler.ghcjs.overrideAttrs (ghcOld: {
36 + passthru = ghcOld.passthru // {
37 + configuredSrc = patchedConfiguredSrc;
38 + bootGhcjs = patchedBootGhcjs;
39 + };
40 + # Use the patched bootGhcjs in nativeBuildInputs
41 + nativeBuildInputs = map (x:
42 + if x == super.haskell.compiler.ghcjs.passthru.bootGhcjs
43 + then patchedBootGhcjs
44 + else x
45 + ) (ghcOld.nativeBuildInputs or []);
46 + });
47 };
48
49 packages = super.haskell.packages // {
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -20)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +17 lines (ctrl+o to expand)
⎿ (timeout 2m)
⏺ Progress! New derivations appeared but the old unpatched one is still there. Let me check what still depends on it.
⏺ Bash(nix-store -q --referrers-closure /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv 2>&1 | head -20)
⎿ /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv
/nix/store/xx1yiickzc9335ifff65dmmjvsvr10c1-ghcjs-8.10.7.drv
/nix/store/c81yjny8ir20408xil95yb7x5kffalac-transformers-compat-0.7.2.drv
… +17 lines (ctrl+o to expand)
⏺ The patched derivation still depends on the old bootGhcjs. My replacement logic isn't working. Let me simplify the approach.
⏺ Bash(nix derivation show /nix/store/g7qn3aliklahya9b87swkb8zgvpladxa-ghcjs-8.10.7.drv 2>/dev/null | grep -E '"nativeBuildInputs"' | head -3)
⎿ "nativeBuildInputs": "/nix/store/fpw78xnk9w8nqfazbg2bg0lgxzdpg9m5-ghcjs-8.10.7 /nix/store/lwi8bdwi6dlgvrnx2736jjj34qmywpy6-ghc-8.10.7 /nix/store/213ra7zhc3z95ksvckz0
bnnif2vhhnaf-cabal-install-3.10.3.0 /nix/store/bzzs4kvjyvjjhs3rj08vqpvvzmfggvbv-nodejs-20.12.2 /nix/store/8j4hiinc593ih7ivwvflf6qsy6j1l9c2-make-shell-wrapper-hook /nix/sto
re/jigjfkcnjrak278cgzgkh6hisrijfmg6-lndir-1.0.5 /nix/store/ifyiaj7bvdm6zkrw149786m68wr7wvn5-gmp-with-cxx-6.3.0-dev /nix/store/b5hlaiv3vg8qgr3vhsw78cjh5s2zrph9-pkg-config-w
rapper-0.29.2 /nix/store/bwcwdgfr3831h4lrh6cfd58bx3x4mk9f-gcc-wrapper-13.2.0",
⏺ Bash(nix derivation show /nix/store/g7qn3aliklahya9b87swkb8zgvpladxa-ghcjs-8.10.7.drv 2>/dev/null | grep "fpw78xnk9w8nqfazbg2bg0lgxzdpg9m5-ghcjs")
⎿ "nativeBuildInputs": "/nix/store/fpw78xnk9w8nqfazbg2bg0lgxzdpg9m5-ghcjs-8.10.7 /nix/store/lwi8bdwi6dlgvrnx2736jjj34qmywpy6-ghc-8.10.7 /nix/store/213ra7zhc3z95ksvckz0
bnnif2vhhnaf-cabal-install-3.10.3.0 /nix/store/bzzs4kvjyvjjhs3rj08vqpvvzmfggvbv-nodejs-20.12.2 /nix/store/8j4hiinc593ih7ivwvflf6qsy6j1l9c2-make-shell-wrapper-hook /nix/sto
re/jigjfkcnjrak278cgzgkh6hisrijfmg6-lndir-1.0.5 /nix/store/ifyiaj7bvdm6zkrw149786m68wr7wvn5-gmp-with-cxx-6.3.0-dev /nix/store/b5hlaiv3vg8qgr3vhsw78cjh5s2zrph9-pkg-config-w
rapper-0.29.2 /nix/store/bwcwdgfr3831h4lrh6cfd58bx3x4mk9f-gcc-wrapper-13.2.0",
⏺ Bash(ls /nix/store/fpw78xnk9w8nqfazbg2bg0lgxzdpg9m5-ghcjs-8.10.7 2>&1 || nix-store -q --deriver /nix/store/fpw78xnk9w8nqfazbg2bg0lgxzdpg9m5-ghcjs-8.10.7 2>&1 || echo…)
⎿ ls: /nix/store/fpw78xnk9w8nqfazbg2bg0lgxzdpg9m5-ghcjs-8.10.7: No such file or directory
error: path '/nix/store/fpw78xnk9w8nqfazbg2bg0lgxzdpg9m5-ghcjs-8.10.7' is not valid
Not in store
⏺ Bash(nix derivation show /nix/store/g7qn3aliklahya9b87swkb8zgvpladxa-ghcjs-8.10.7.drv 2>/dev/null | jq -r '.[] | .inputDrvs | keys[]' | grep ghcjs | head -5)
⎿ /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv
/nix/store/6v281k29a2ba91g2xp3pafs62lqnn7ab-configured-ghcjs-src.drv
/nix/store/g7h7l976ihy3a88qfa3m5x0zh37w3zir-ghcjs-8.10.7.drv
⏺ My override isn't replacing the dependencies correctly. Let me try a simpler approach - just patching the source derivation.
⏺ Update(flake.nix)
⎿ Added 11 lines, removed 13 lines
19 compiler = super.haskell.compiler // {
20 ghcjs =
21 let
22 + originalGhcjs = super.haskell.compiler.ghcjs;
23 +
24 # Patch the configured source to fix the fs.h path issue
23 - patchedConfiguredSrc = super.haskell.compiler.ghcjs.passthru.configuredSrc.overrideAttrs (srcOld: {
25 + patchedConfiguredSrc = originalGhcjs.passthru.configuredSrc.overrideAttrs (srcOld: {
26 buildCommand = srcOld.buildCommand + ''
27 # Fix incorrect path for fs.h in ghcjs.cabal
28 sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' $out/ghcjs.cabal
...
30 });
31
32 # Patch bootGhcjs to use the patched source
31 - patchedBootGhcjs = super.haskell.compiler.ghcjs.passthru.bootGhcjs.overrideAttrs (bootOld: {
33 + patchedBootGhcjs = originalGhcjs.passthru.bootGhcjs.overrideAttrs (bootOld: {
34 src = patchedConfiguredSrc;
35 });
36 in
35 - super.haskell.compiler.ghcjs.overrideAttrs (ghcOld: {
36 - passthru = ghcOld.passthru // {
37 - configuredSrc = patchedConfiguredSrc;
38 - bootGhcjs = patchedBootGhcjs;
37 + # Override the entire GHCJS using the same approach nixpkgs uses
38 + originalGhcjs.override {
39 + bootPkgs = originalGhcjs.passthru.bootPkgs.override {
40 + overrides = hself: hsuper: {
41 + ghcjs = patchedBootGhcjs;
42 + };
43 };
40 - # Use the patched bootGhcjs in nativeBuildInputs
41 - nativeBuildInputs = map (x:
42 - if x == super.haskell.compiler.ghcjs.passthru.bootGhcjs
43 - then patchedBootGhcjs
44 - else x
45 - ) (ghcOld.nativeBuildInputs or []);
46 - });
44 + };
45 };
46
47 packages = super.haskell.packages // {
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -10)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +7 lines (ctrl+o to expand)
⏺ Update(flake.nix)
⎿ Added 15 lines, removed 7 lines
33 patchedBootGhcjs = originalGhcjs.passthru.bootGhcjs.overrideAttrs (bootOld: {
34 src = patchedConfiguredSrc;
35 });
36 +
37 + # We need to rebuild the final GHCJS using the patched bootGhcjs
38 + # The final GHCJS runs ghcjs-boot using bootGhcjs, so we patch the buildPhase
39 in
37 - # Override the entire GHCJS using the same approach nixpkgs uses
38 - originalGhcjs.override {
39 - bootPkgs = originalGhcjs.passthru.bootPkgs.override {
40 - overrides = hself: hsuper: {
41 - ghcjs = patchedBootGhcjs;
42 - };
40 + originalGhcjs.overrideAttrs (final: prev: {
41 + nativeBuildInputs = [ patchedBootGhcjs ] ++
42 + (builtins.filter (x: !(self.lib.hasPrefix "ghcjs-8.10.7" (baseNameOf (toString x))))
43 + (prev.nativeBuildInputs or []));
44 + buildPhase = builtins.replaceStrings
45 + [ (toString originalGhcjs.passthru.bootGhcjs) ]
46 + [ (toString patchedBootGhcjs) ]
47 + prev.buildPhase;
48 + passthru = prev.passthru // {
49 + configuredSrc = patchedConfiguredSrc;
50 + bootGhcjs = patchedBootGhcjs;
51 };
44 - };
52 + });
53 };
54
55 packages = super.haskell.packages // {
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -15)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +12 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ Bash(nix derivation show /nix/store/c3zsgc20xlrqbsgnajsj1aghn90lcmj2-ghcjs-8.10.7.drv 2>/dev/null | jq -r '.[] | .inputDrvs | keys[]' | grep ghcjs)
⎿ /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv
/nix/store/6v281k29a2ba91g2xp3pafs62lqnn7ab-configured-ghcjs-src.drv
/nix/store/g7h7l976ihy3a88qfa3m5x0zh37w3zir-ghcjs-8.10.7.drv
⏺ The dependencies are still there. Let me try a more direct approach - adding a patch to the bootGhcjs derivation.
⏺ Bash(nix derivation show /nix/store/1d66a8himxb4ys2r7wska88ghwkagdk1-ghcjs-8.10.7.drv 2>/dev/null | jq -r '.[] | .env.patches')
⎿ /nix/store/19mli31i0k0fb93vbr994m4xak65yapl-ghcjs-aeson-2.0.patch
⏺ The bootGhcjs accepts patches. Let me create a patch and add it properly.
⏺ Write(ghcjs-fix-fs-header-path.patch)
⎿ Wrote 20 lines to ghcjs-fix-fs-header-path.patch
1 diff --git a/ghcjs.cabal b/ghcjs.cabal
2 index 1234567..abcdefg 100644
3 --- a/ghcjs.cabal
4 +++ b/ghcjs.cabal
5 @@ -43,7 +43,7 @@ library
6 ghc/libraries/ghc-prim/cbits
7 ghc/utils/fs
8 ghc/rts
9 - ghc/utils/unlit/fs.h
10 + ghc/utils/fs/fs.h
… +10 lines (ctrl+o to expand)
⏺ Update(flake.nix)
⎿ Added 6 lines, removed 19 lines
21 let
22 originalGhcjs = super.haskell.compiler.ghcjs;
23
24 - # Patch the configured source to fix the fs.h path issue
25 - patchedConfiguredSrc = originalGhcjs.passthru.configuredSrc.overrideAttrs (srcOld: {
26 - buildCommand = srcOld.buildCommand + ''
27 - # Fix incorrect path for fs.h in ghcjs.cabal
28 - sed -i 's|ghc/utils/unlit/fs.h|ghc/utils/fs/fs.h|g' $out/ghcjs.cabal
29 - '';
30 - });
31 -
32 - # Patch bootGhcjs to use the patched source
24 + # Patch bootGhcjs to fix the fs.h path issue
25 patchedBootGhcjs = originalGhcjs.passthru.bootGhcjs.overrideAttrs (bootOld: {
34 - src = patchedConfiguredSrc;
26 + patches = (bootOld.patches or []) ++ [ ./ghcjs-fix-fs-header-path.patch ];
27 });
36 -
37 - # We need to rebuild the final GHCJS using the patched bootGhcjs
38 - # The final GHCJS runs ghcjs-boot using bootGhcjs, so we patch the buildPhase
28 in
29 + # The final GHCJS runs ghcjs-boot using bootGhcjs
30 + # We need to replace the bootGhcjs reference in the buildPhase
31 originalGhcjs.overrideAttrs (final: prev: {
41 - nativeBuildInputs = [ patchedBootGhcjs ] ++
42 - (builtins.filter (x: !(self.lib.hasPrefix "ghcjs-8.10.7" (baseNameOf (toString x))))
43 - (prev.nativeBuildInputs or []));
32 buildPhase = builtins.replaceStrings
45 - [ (toString originalGhcjs.passthru.bootGhcjs) ]
46 - [ (toString patchedBootGhcjs) ]
33 + [ "${originalGhcjs.passthru.bootGhcjs}" ]
34 + [ "${patchedBootGhcjs}" ]
35 prev.buildPhase;
36 passthru = prev.passthru // {
49 - configuredSrc = patchedConfiguredSrc;
37 bootGhcjs = patchedBootGhcjs;
38 };
39 });
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -15)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +12 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ Bash(nix derivation show /nix/store/xx1yiickzc9335ifff65dmmjvsvr10c1-ghcjs-8.10.7.drv 2>/dev/null | jq -r '.[] | .env.buildPhase' | head -20)
⎿ export HOME=$TMP
mkdir $HOME/.cabal
touch $HOME/.cabal/config
… +17 lines (ctrl+o to expand)
⏺ Update(flake.nix)
⎿ Added 32 lines, removed 6 lines
20 ghcjs =
21 let
22 originalGhcjs = super.haskell.compiler.ghcjs;
23 + originalBootGhcjs = originalGhcjs.passthru.bootGhcjs;
24 + emsdk = "/nix/store/rsd7naynyq6r8cry568r1widlzgxvqzg-emsdk";
25
26 # Patch bootGhcjs to fix the fs.h path issue
25 - patchedBootGhcjs = originalGhcjs.passthru.bootGhcjs.overrideAttrs (bootOld: {
27 + patchedBootGhcjs = originalBootGhcjs.overrideAttrs (bootOld: {
28 patches = (bootOld.patches or []) ++ [ ./ghcjs-fix-fs-header-path.patch ];
29 });
30 in
31 # The final GHCJS runs ghcjs-boot using bootGhcjs
30 - # We need to replace the bootGhcjs reference in the buildPhase
32 originalGhcjs.overrideAttrs (final: prev: {
32 - buildPhase = builtins.replaceStrings
33 - [ "${originalGhcjs.passthru.bootGhcjs}" ]
34 - [ "${patchedBootGhcjs}" ]
35 - prev.buildPhase;
33 + nativeBuildInputs = [ patchedBootGhcjs ] ++
34 + (builtins.filter (x: x != originalBootGhcjs) prev.nativeBuildInputs);
35 +
36 + # Rewrite buildPhase to use patched bootGhcjs
37 + buildPhase = ''
38 + export HOME=$TMP
39 + mkdir $HOME/.cabal
40 + touch $HOME/.cabal/config
41 + cd lib/boot
42 +
43 + mkdir -p $out/bin
44 + mkdir -p $out/lib/ghcjs-8.10.7
45 + lndir ${patchedBootGhcjs}/bin $out/bin
46 + chmod -R +w $out/bin
47 + rm $out/bin/ghcjs-boot
48 + cp ${patchedBootGhcjs}/bin/ghcjs-boot $out/bin
49 + rm $out/bin/haddock
50 + cp ${patchedBootGhcjs}/bin/haddock $out/bin
51 + cp ${patchedBootGhcjs}/bin/private-ghcjs-hsc2hs $out/bin/ghcjs-hsc2hs
52 +
53 + wrapProgram $out/bin/ghcjs-boot --set ghcjs_libexecdir $out/bin
54 +
55 + wrapProgram $out/bin/ghcjs --add-flags "-B$out/lib/ghcjs-8.10.7"
56 + wrapProgram $out/bin/haddock --add-flags "-B$out/lib/ghcjs-8.10.7"
57 + wrapProgram $out/bin/ghcjs-pkg --add-flags "--global-package-db=$out/lib/ghcjs-8.10.7/package.conf.d"
58 + wrapProgram $out/bin/ghcjs-hsc2hs --add-flags "-I$out/lib/ghcjs-8.10.7/include --template=$out/lib/ghcjs-8.10.7/include/template-hsc.h"
59 +
60 + env PATH=$out/bin:$PATH $out/bin/ghcjs-boot --with-emsdk=${emsdk} --no-haddock
61 + '';
62 passthru = prev.passthru // {
63 bootGhcjs = patchedBootGhcjs;
64 };
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -15)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +12 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ Bash(nix eval '.#packages.aarch64-darwin.website' 2>&1 | head -20)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +16 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ Bash(nix eval '.#packages.aarch64-darwin.website' --show-trace 2>&1 | tail -50)
⎿ … while evaluating derivation 'grace-1.0.0'
whose name attribute is located at /nix/store/wzx1ba5hqqfa23vfrvqmfmkpj25p37mr-source/pkgs/stdenv/generic/make-derivation.nix:331:7
… +46 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ The patch file isn't being included in the flake source. I need to add it to git.
⏺ Bash(git add ghcjs-fix-fs-header-path.patch)
⎿ (No content)
⏺ Bash(nix build '.#website' --dry-run 2>&1 | head -15)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +12 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ The old unpatched derivation is gone. Let me run the actual build.
⏺ Bash(nix build '.#website' 2>&1 | head -100)
⎿ Running in the background (↓ to manage)
⏺ Bash(sleep 30 && tail -50 /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/b58f2ef.output)
⎿ /nix/store/86yy83xnzn448cdi6whhds7djyf6zx5g-scientific-0.3.7.0.drv
/nix/store/6b0fzhz0141x6iwhzrdcpfk1v2w1hx7v-attoparsec-0.14.4.drv
/nix/store/fx1j2cwy3yxvsl8riv0plvn4q06k5b4z-foldable1-classes-compat-0.1.drv
… +47 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ Bash(sleep 60 && tail -50 /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/b58f2ef.output)
⎿ /nix/store/86yy83xnzn448cdi6whhds7djyf6zx5g-scientific-0.3.7.0.drv
/nix/store/6b0fzhz0141x6iwhzrdcpfk1v2w1hx7v-attoparsec-0.14.4.drv
/nix/store/fx1j2cwy3yxvsl8riv0plvn4q06k5b4z-foldable1-classes-compat-0.1.drv
… +47 lines (ctrl+o to expand)
⎿ (timeout 1m 30s)
⏺ Read 1 file (ctrl+o to expand)
⏺ Task Output(non-blocking) b58f2ef
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +97 lines (ctrl+o to expand)
⏺ The previous command only showed the dry-run output. Let me run the actual build.
⏺ Bash(nix build '.#website' 2>&1)
⎿ Running in the background (↓ to manage)
⏺ Bash(sleep 45 && tail -30 /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/be09ecd.output)
⎿ /nix/store/dn9ris65w03f6ymlm14iydxbb9whrm8b-Earley-0.13.0.1.drv
/nix/store/jrv01s4kgdima7jvx97cfirgqfk4i05l-attoparsec-aeson-2.1.0.0.drv
/nix/store/fjm4wx6y6g5y511aaf7qhzxy1bdyznf2-aeson-pretty-0.8.10.drv
… +27 lines (ctrl+o to expand)
⎿ (timeout 1m)
⏺ The patch failed because the line numbers don't match. Let me look at the actual ghcjs.cabal content to create a correct patch.
⏺ Searched for 1 pattern (ctrl+o to expand)
⏺ Bash(sed -n '43,50p' /nix/store/bzbhyxvbqlj0wsn7hxwv3ppjwg9l8947-configured-ghcjs-src/ghcjs.cabal && echo "---" && sed -n '916,922p' /nix/store/bzbhyxvbqlj0wsn7hxwv3…)
⎿ ghc/includes/HsFFI.h
ghc/includes/Cmm.h
ghc/includes/stg/*.h
… +13 lines (ctrl+o to expand)
⏺ Write(ghcjs-fix-fs-header-path.patch)
⎿ Added 16 lines, removed 15 lines
1 -diff --git a/ghcjs.cabal b/ghcjs.cabal
2 -index 1234567..abcdefg 100644
1 --- a/ghcjs.cabal
2 +++ b/ghcjs.cabal
5 -@@ -43,7 +43,7 @@ library
6 - ghc/libraries/ghc-prim/cbits
7 - ghc/utils/fs
8 - ghc/rts
9 -- ghc/utils/unlit/fs.h
10 -+ ghc/utils/fs/fs.h
11 - GHC-Options: -Wall -fno-warn-orphans -fno-warn-name-shadowing -fno-warn-unused-do-bind -fprof-auto-calls -fobject-code
12 - if flag(disable-optimizer)
13 - cpp-options: -DDISABLE_OPTIMIZER
14 -@@ -916,4 +916,4 @@ executable ghcjs
15 - Main-Is: Main.hs
16 - Build-Depends: base, ghcjs
17 - Default-Language: Haskell2010
3 +@@ -43,7 +43,7 @@
4 + ghc/includes/HsFFI.h
5 + ghc/includes/Cmm.h
6 + ghc/includes/stg/*.h
7 +- ghc/utils/unlit/fs.h
8 ++ ghc/utils/fs/fs.h
9 + ghc/driver/utils/cwrapper.h
10 + ghc/driver/utils/getLocation.h
11 + utils/wrapper/getline.h
12 +@@ -916,7 +916,7 @@
13 + hs-source-dirs: ghc/utils/unlit
14 + Main-Is: unlit.c
15 + C-Sources: ghc/utils/unlit/fs.c
16 - Includes: ghc/utils/unlit/fs.h
17 + Includes: ghc/utils/fs/fs.h
18 +
19 + Executable private-ghcjs-touchy
20 + if flag(compiler-only) || !os(Windows)
⏺ Bash(nix build '.#website' 2>&1)
⎿ Running in the background (↓ to manage)
⏺ Bash(sleep 60 && tail -30 /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/b147187.output)
⎿ /nix/store/l8pbsi1wzx3s61pixf153lpp7qjzrj5y-http-client-tls-0.3.6.3.drv
/nix/store/5kkvw8j3a40bb33fbxvwpmgk9pbkkind-openai-2.2.1.drv
/nix/store/b7i843vdhv9r2p4lhqal5iz6y0ir5kpn-ghcjs-base-0.2.1.0.drv
… +27 lines (ctrl+o to expand)
⎿ (timeout 1m 30s)
⏺ The build is progressing - it's now compiling GHCJS. Let me check the progress.
⏺ Bash(sleep 120 && tail -50 /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/b147187.output)
⎿ /nix/store/jh5qq2khcp0q1kf975xbyg8bxavk51as-profunctors-5.6.2.drv
/nix/store/j8mdk8h1aw88d812dbi5fykrfydzm0nx-free-5.2.drv
/nix/store/pk7bfvcndb262aqb5g18y3lf0dksn268-servant-client-core-0.20.drv
… +47 lines (ctrl+o to expand)
⎿ (timeout 3m)
⏺ The GHCJS build is in progress. This is a large compilation that takes time. Let me check again.
⏺ Task Output(non-blocking) b147187
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +142 lines (ctrl+o to expand)
⏺ The build is running and compiling GHCJS with the patched ghcjs.cabal file. The fix is now being applied. Here's a summary of what was done:
Summary of the Fix
Problem: The GHCJS build was failing with:
Missing (or bad) header file: ghc/utils/unlit/fs.h
Root Cause: The ghcjs.cabal file in nixpkgs 24.05's GHCJS package references ghc/utils/unlit/fs.h, but the actual file is located at ghc/utils/fs/fs.h.
Solution: I created a patch file and modified flake.nix to:
1. Apply the patch to the GHCJS boot compiler (bootGhcjs)
2. Override the final GHCJS to use the patched boot compiler
Files modified:
- flake.nix - Added GHCJS compiler override with patch
- ghcjs-fix-fs-header-path.patch - New patch file to fix the header path
The build is now compiling GHCJS. Since this is a full compiler build from source, it will take some time. Would you like me to continue monitoring the build, or is there
anything else you'd like me to do while waiting?
✻ Brewed for 20m 35s
⏺ Background command "Run the actual build" completed (exit code 0)
⏺ Task Output(non-blocking) b147187
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +142 lines (ctrl+o to expand)
⏺ The build is still compiling GHCJS (the patched version). This is a large compilation. Let me check on it again.
⏺ Read 1 file (ctrl+o to expand)
⏺ The GHCJS compilation is in progress. The build got past the configuration stage (where it was previously failing), which confirms the patch is working. Compiling GHCJS from
source takes significant time since it's a full Haskell-to-JavaScript compiler.
The build is running in the background (task ID: b147187). You can:
- Wait for it to complete
- Check progress with: tail -f /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/b147187.output
- Or check the nix build log: nix log /nix/store/zrzj3wz2hizyl754mwyk5fxn6mir45k2-ghcjs-8.10.7.drv
The fix I applied:
1. Created ghcjs-fix-fs-header-path.patch to correct the fs.h path in ghcjs.cabal
2. Modified flake.nix to apply this patch to the GHCJS boot compiler and use the patched version in the final build
Would you like me to continue monitoring the build, or is there anything else you need?
⏺ Background command "Run the actual build with the patched GHCJS" failed with exit code 1
⏺ Read 1 file (ctrl+o to expand)
⏺ That was the earlier failed build with the incorrect patch. The current build (b147187) is using the corrected patch. Let me check its status.
⏺ Task Output(non-blocking) b147187
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +142 lines (ctrl+o to expand)
⏺ The current build (task b147187) is still running with the corrected patch. It's building a different GHCJS derivation (zrzj3wz2hizyl754mwyk5fxn6mir45k2) than the one that failed
(wxr0rjb0dcf713hdddvdqs130mq8v8mc).
The failed build was from an earlier attempt with the incorrect patch format. The current build has the fixed patch with proper context lines.
Let me wait for the current build to make more progress.
⏺ Bash(sleep 120 && tail -20 /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/b147187.output)
⎿ /nix/store/a6dsidy3afgcrfv7as5xmdh43lagi9ax-aeson-pretty-0.8.10.drv
/nix/store/bani38qfjlkvhla2zxp17v0jjasib457-aeson-yaml-1.1.0.1.drv
/nix/store/bkfqcld0cidsvxjygcq4vmqnk77gyzxv-Earley-0.13.0.1.drv
… +17 lines (ctrl+o to expand)
⎿ (timeout 3m)
⏺ The build is still compiling GHCJS. Let me check the actual build log to see the progress.
⏺ Bash(nix log /nix/store/zrzj3wz2hizyl754mwyk5fxn6mir45k2-ghcjs-8.10.7.drv 2>&1 | tail -30)
⎿ warning: The interpretation of store paths arguments ending in `.drv` recently changed. If this command is now failing try again with '/nix/store/zrzj3wz2hizyl754mwyk5fxn6
mir45k2-ghcjs-8.10.7.drv^*'
got build log for '/nix/store/zrzj3wz2hizyl754mwyk5fxn6mir45k2-ghcjs-8.10.7.drv' from 'daemon'
⏺ Bash(nix log '/nix/store/zrzj3wz2hizyl754mwyk5fxn6mir45k2-ghcjs-8.10.7.drv^*' 2>&1 | tail -50)
⎿ got build log for '/nix/store/zrzj3wz2hizyl754mwyk5fxn6mir45k2-ghcjs-8.10.7.drv^*' from 'daemon'
⏺ Task Output(non-blocking) b147187
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +142 lines (ctrl+o to expand)
⏺ The build is still running. GHCJS compilation is a lengthy process as it's a full compiler. The build is progressing without errors so far.
Current status:
- Task ID: b147187
- Building: /nix/store/zrzj3wz2hizyl754mwyk5fxn6mir45k2-ghcjs-8.10.7.drv
- Status: Running (compiling GHCJS from source)
Files modified for the fix:
1. flake.nix - GHCJS compiler override to apply the patch
2. ghcjs-fix-fs-header-path.patch - Patch to fix the fs.h path
You can monitor the build with:
tail -f /private/tmp/claude-501/-Users-gabriella-proj-grace/tasks/b147187.output
Or check the detailed nix log with:
nix log /nix/store/zrzj3wz2hizyl754mwyk5fxn6mir45k2-ghcjs-8.10.7.drv
Would you like me to continue waiting for the build to complete, or would you prefer to let it run and check back later?
✻ Churned for 2m 45s
… and here's the second part of the Claude Code session (post-compaction) up until Claude ran out of tokens for the day:
❯ So there are a few issues with this solution: (A) you shouldn't have hardcoded `/nix/store` paths (like `/nix/store/rsd…-emdsk`) and (B) you shouldn't copy/paste/edit the `buildPhase` (because that will lead to configuration drift if I, say, upgrade Nixpkgs)
⏺ Let me fix the two issues with the solution. I need to:
1. Extract the emsdk path dynamically from the original derivation
2. Use string replacement on the original buildPhase instead of copying it
⏺ Read 1 file (ctrl+o to expand)
⏺ I'll rewrite the GHCJS override to use builtins.replaceStrings to swap the bootGhcjs reference in the original buildPhase, which avoids both issues.
⏺ Update(flake.nix)
⎿ Added 5 lines, removed 26 lines
21 let
22 originalGhcjs = super.haskell.compiler.ghcjs;
23 originalBootGhcjs = originalGhcjs.passthru.bootGhcjs;
24 - emsdk = "/nix/store/rsd7naynyq6r8cry568r1widlzgxvqzg-emsdk";
24
25 # Patch bootGhcjs to fix the fs.h path issue
26 patchedBootGhcjs = originalBootGhcjs.overrideAttrs (bootOld: {
...
32 nativeBuildInputs = [ patchedBootGhcjs ] ++
33 (builtins.filter (x: x != originalBootGhcjs) prev.nativeBuildInputs);
34
36 - # Rewrite buildPhase to use patched bootGhcjs
37 - buildPhase = ''
38 - export HOME=$TMP
39 - mkdir $HOME/.cabal
40 - touch $HOME/.cabal/config
41 - cd lib/boot
35 + # Replace references to originalBootGhcjs with patchedBootGhcjs
36 + buildPhase = builtins.replaceStrings
37 + [ "${originalBootGhcjs}" ]
38 + [ "${patchedBootGhcjs}" ]
39 + prev.buildPhase;
40
43 - mkdir -p $out/bin
44 - mkdir -p $out/lib/ghcjs-8.10.7
45 - lndir ${patchedBootGhcjs}/bin $out/bin
46 - chmod -R +w $out/bin
47 - rm $out/bin/ghcjs-boot
48 - cp ${patchedBootGhcjs}/bin/ghcjs-boot $out/bin
49 - rm $out/bin/haddock
50 - cp ${patchedBootGhcjs}/bin/haddock $out/bin
51 - cp ${patchedBootGhcjs}/bin/private-ghcjs-hsc2hs $out/bin/ghcjs-hsc2hs
52 -
53 - wrapProgram $out/bin/ghcjs-boot --set ghcjs_libexecdir $out/bin
54 -
55 - wrapProgram $out/bin/ghcjs --add-flags "-B$out/lib/ghcjs-8.10.7"
56 - wrapProgram $out/bin/haddock --add-flags "-B$out/lib/ghcjs-8.10.7"
57 - wrapProgram $out/bin/ghcjs-pkg --add-flags "--global-package-db=$out/lib/ghcjs-8.10.7/package.conf.d"
58 - wrapProgram $out/bin/ghcjs-hsc2hs --add-flags "-I$out/lib/ghcjs-8.10.7/include --template=$out/lib/ghcjs-8.10.7/include/template-hsc.h"
59 -
60 - env PATH=$out/bin:$PATH $out/bin/ghcjs-boot --with-emsdk=${emsdk} --no-haddock
61 - '';
41 passthru = prev.passthru // {
42 bootGhcjs = patchedBootGhcjs;
43 };
⏺ Now let me test the build to verify the fix works correctly.
⏺ Bash(nix build '.#website' 2>&1 | head -100)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +97 lines (ctrl+o to expand)
⎿ (timeout 5m)
❯ String replacement is also not an idiomatic Nix solution to the problem. Typically the right way to do these sorts of things is a well-placed `.override(…)` or
`.overrideAttrs(…)` or similar
⏺ Let me stop the build and approach this more idiomatically. The user is right - string replacement isn't the right pattern.
⏺ Bash(pkill -f "nix build" 2>/dev/null || true)
⎿ (No content)
⏺ Let me examine the GHCJS derivation structure in nixpkgs to find the proper override point.
⏺ Bash(nix repl --expr 'import <nixpkgs> { config.allowBroken = true; }' <<'EOF' 2>&1 | head -80
ghcjs = haskell.compiler.ghcjs…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Loading installable ''...
… +24 lines (ctrl+o to expand)
⏺ I can see ghcjsSrc is an override argument for the GHCJS derivation. Let me check what it is.
⏺ Bash(nix repl --expr 'import <nixpkgs> { config.allowBroken = true; }' <<'EOF' 2>&1 | head -40
ghcjs = haskell.compiler.ghcjs…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Loading installable ''...
… +10 lines (ctrl+o to expand)
⏺ Bash(nix repl --expr 'import <nixpkgs> { config.allowBroken = true; }' <<'EOF' 2>&1 | head -60
ghcjs = haskell.compiler.ghcjs…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Loading installable ''...
… +22 lines (ctrl+o to expand)
⏺ Bash(nix repl --expr 'import <nixpkgs> { config.allowBroken = true; }' <<'EOF' 2>&1 | head -40
ghcjs = haskell.compiler.ghcjs…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Loading installable ''...
… +12 lines (ctrl+o to expand)
⏺ Let me look at the nixpkgs source to understand the GHCJS build flow.
⏺ Bash(find $(nix-instantiate --eval -E '<nixpkgs>' 2>/dev/null | tr -d '"') -path '*/compilers/ghcjs*' -name '*.nix' 2>/dev/null | head -10)
⎿ (No content)
⏺ Bash(nix flake metadata nixpkgs --json 2>/dev/null | jq -r '.path')
⎿ /nix/store/kybn3gi1myqgsndhd8mzq6sfq1c9aw8k-source
⏺ Searched for 6 patterns, read 1 file (ctrl+o to expand)
⏺ Bash(nix derivation show /nix/store/qfbwk2kninzh8qkzxjmf8fnrccl0b1dz-configured-ghcjs-src.drv 2>/dev/null | jq -r '.[] | .env.buildCommand' | head -50)
⎿ export HOME=$(pwd)
mkdir $HOME/.cabal
touch $HOME/.cabal/config
… +25 lines (ctrl+o to expand)
⏺ Now I understand the structure. The ghcjsSrc is copied into configuredSrc, so I can patch ghcjsSrc and use .override properly. Let me implement the idiomatic solution.
⏺ Read 1 file (ctrl+o to expand)
⏺ Update(flake.nix)
⎿ Added 8 lines, removed 19 lines
20 ghcjs =
21 let
22 originalGhcjs = super.haskell.compiler.ghcjs;
23 - originalBootGhcjs = originalGhcjs.passthru.bootGhcjs;
23 + originalGhcjsSrc = originalGhcjs.passthru.configuredSrc.ghcjsSrc;
24
25 - # Patch bootGhcjs to fix the fs.h path issue
26 - patchedBootGhcjs = originalBootGhcjs.overrideAttrs (bootOld: {
27 - patches = (bootOld.patches or []) ++ [ ./ghcjs-fix-fs-header-path.patch ];
25 + # Patch ghcjsSrc to fix the fs.h path issue in ghcjs.cabal
26 + patchedGhcjsSrc = originalGhcjsSrc.overrideAttrs (old: {
27 + patches = (old.patches or []) ++ [ ./ghcjs-fix-fs-header-path.patch ];
28 });
29 in
30 - # The final GHCJS runs ghcjs-boot using bootGhcjs
31 - originalGhcjs.overrideAttrs (final: prev: {
32 - nativeBuildInputs = [ patchedBootGhcjs ] ++
33 - (builtins.filter (x: x != originalBootGhcjs) prev.nativeBuildInputs);
34 -
35 - # Replace references to originalBootGhcjs with patchedBootGhcjs
36 - buildPhase = builtins.replaceStrings
37 - [ "${originalBootGhcjs}" ]
38 - [ "${patchedBootGhcjs}" ]
39 - prev.buildPhase;
40 -
41 - passthru = prev.passthru // {
42 - bootGhcjs = patchedBootGhcjs;
43 - };
44 - });
30 + # Use .override to pass the patched source through the proper build flow
31 + originalGhcjs.override {
32 + ghcjsSrc = patchedGhcjsSrc;
33 + };
34 };
35
36 packages = super.haskell.packages // {
⏺ Now let me test this idiomatic solution.
⏺ Bash(nix build '.#website' 2>&1 | head -80)
⎿ warning: Git tree '/Users/gabriella/proj/grace' is dirty
Using saved setting for 'extra-substituters = https://cache.garnix.io' from ~/.local/share/nix/trusted-settings.json.
Using saved setting for 'extra-trusted-public-keys = cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=' from ~/.local/share/nix/trusted-settings.json.
… +77 lines (ctrl+o to expand)
⎿ (timeout 5m)
⏺ The build started. Let me let it continue to verify the patch is being applied correctly.
⏺ Bash(nix build '.#website' 2>&1 | tail -50)
⎿ /nix/store/gy3qjb7crbkzspadxsdysqqkgcanj27m-generic-lens-core-2.2.1.0.drv
/nix/store/8lc2ny6l240i8hd1r63ahpwm42rqr2xr-generic-lens-2.2.2.0.drv
/nix/store/9wq3vlx7wirm89djgskl5088k6ahiv93-uri-encode-1.5.0.7.drv
… +47 lines (ctrl+o to expand)
⎿ (timeout 10m)
⏺ Let me check the build logs for details.
⏺ Bash(nix log /nix/store/2jpi88njcmy041ylmpjpcgqnm56p8grb-ghcjs-8.10.7.drv 2>&1 | tail -80)
⎿ depends vector-0.13.1.0-AGEMzTIScVX6jmaFCxKhWM
depends yaml-0.11.11.2-2XxeaDR3Ubo8fW9vML2bcq
definite ghcjs-8.10.7-8vuljSP9EelETv8bblrvx6-ghcjs
… +76 lines (ctrl+o to expand)
⏺ The same error persists, meaning the patch isn't being applied where it needs to be. Let me check what derivation the ghcjsSrc is and whether the patch applies there.
⏺ Bash(nix repl --expr 'import <nixpkgs> { config.allowBroken = true; }' <<'EOF' 2>&1 | head -40
ghcjs = haskell.compiler.ghcjs…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Loading installable ''...
… +18 lines (ctrl+o to expand)
⏺ Bash(nix derivation show /nix/store/63f2rsx6g6ms550fzxqgigl68ipcbrcw-ghcjs-9fc935f.drv 2>/dev/null | jq -r '.[] | keys' | head -10)
⎿ [
"args",
"builder",
… +7 lines (ctrl+o to expand)
⏺ Bash(nix derivation show /nix/store/63f2rsx6g6ms550fzxqgigl68ipcbrcw-ghcjs-9fc935f.drv 2>/dev/null | jq -r '.[] | .builder')
⎿ /nix/store/ap4xjkwp0lshyywxqw88phnnc0j1fnzw-bash-5.2p32/bin/bash
⏺ Bash(nix derivation show /nix/store/63f2rsx6g6ms550fzxqgigl68ipcbrcw-ghcjs-9fc935f.drv 2>/dev/null | jq -r '.[] | .env | keys' | head -20)
⎿ [
"GIT_SSL_CAINFO",
"__darwinAllowLocalNetworking",
… +17 lines (ctrl+o to expand)
⏺ Bash(nix derivation show /nix/store/63f2rsx6g6ms550fzxqgigl68ipcbrcw-ghcjs-9fc935f.drv 2>/dev/null | jq -r '.[] | .env.postFetch // .env.postUnpack // "no post-fetch…)
⎿ (No content)
⏺ The issue is that ghcjsSrc is a fetchGit result that doesn't support patches directly. I need to wrap it in a derivation that applies the patch. Let me try a different approach -
apply the patch to the configured source properly.
⏺ Bash(nix repl --expr 'import <nixpkgs> { config.allowBroken = true; }' <<'EOF' 2>&1 | head -30
ghcjs = haskell.compiler.ghcjs…)
⎿ Welcome to Nix 2.18.1. Type :? for help.
Loading installable ''...
… +22 lines (ctrl+o to expand)
⎿ You've hit your limit · resets 3pm (America/Los_Angeles)
✻ Sautéed for 7m 47s
❯ Unknown skill: rate-limit-options
Did I mention I like AI? I actually spend a lot of time thinking about how to use AI to improve various workflows and lots of my recent open source work is centered around that. This is why it kind of kills me that vibe coding is so underwhelming because I see so much missed/wasted potential. ↩
The whole point of Nix is to avoid these sorts of reproducibility issues, but they still happen sometimes (especially on macOS). 🤷🏻♀️ ↩
… and I do! A lot of my professional and open source career has been devoted to mentorship and educational/technical writing to help lift up other developers. ↩
Hopefully some next-generation model will train on this blog post and not make the same mistake again. ↩
Also, I have been burned by vibe coding outside of my comfort zone: once I shipped a vibe-coded pull request at work in an area outside of my expertise … and the vibe coded solution misbehaved in subtle ways down the line that were not caught by my own self-review or the other person's review. Someone more familiar with the domain had to diagnose and fix the issue. ↩
While drafting this post I explained my frustration with the author of that script to my partner who replied "he's who chatgpt learned from ^^", and … that's kind of the perfect encapsulation of the problem with vibe coding. ↩