I keep running into this problem with nix, where it claims that the end of the string has been reached:

warning: Git tree '/home/exodrifter/notes/logbook' is dirty
error (ignored): error: end of string reached
error:
       … while calling the 'derivationStrict' builtin
         at <nix/derivation-internal.nix>:9:12:
            8|
            9|   strict = derivationStrict drvAttrs;
             |            ^
           10|

       … while evaluating derivation 'quartz-4.3.1'
         whose name attribute is located at /nix/store/wzx1ba5hqqfa23vfrvqmfmkpj25p37mr-source/pkgs/stdenv/generic/make-derivation.nix:331:7

       … while evaluating attribute 'installPhase' of derivation 'quartz-4.3.1'
         at /nix/store/bkm5f4jk8c8w7zg4iav1vv2xrxvisv9r-source/flake.nix:36:15:
           35|
           36|               installPhase = ''
             |               ^
           37|                 runHook preInstall

       error: path '/nix/store/bkm5f4jk8c8w7zg4iav1vv2xrxvisv9r-source/quartz.layout.ts' does not exist

Apparently, the important part of this error message is actually at the bottom. For some reason that I don’t understand, nix flakes do not consider files that have not yet been tracked by git:

Nix Flakes, Part 1: An introduction and tutorial (tweag.io)

Note that any file that is not tracked by Git is invisible during Nix evaluation, in order to ensure hermetic evaluation.

I don’t know what hermetic evaluation is. Nonetheless, as you can see in this example, the file in question is not tracked yet:

On branch main
Your branch is ahead of 'origin/main' by 93 commits.
  (use "git push" to publish your local commits)

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   flake.nix

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        content/entries/20240915_240936.md
        quartz.layout.ts

no changes added to commit (use "git add" and/or "git commit -a")

If this file becomes tracked (with git add quartz.layout.ts, for example), then the nix error will go away.