If I re-initiate git, the nix build fails

Help
1

Hi, I have met Nix yesterday so I am very new of Nix.

I would like to fork a Github repository which uses Nix: GitHub - hmemcpy/milewski-ctfp-pdf: Bartosz Milewski's 'Category Theory for Programmers' unofficial PDF and LaTeX source

The steps that I did:

  1. Clone the repository.
    $ git clone https://github.com/hmemcpy/milewski-ctfp-pdf.git
$ cd milewski-ctfp-pdf/
  2. Run nixos/nix:latest docker with volume mapping of cloned repository:
    $ docker run -it --rm -v ./:/workspace nixos/nix:latest
  3. Build following README.md of the repository
    $ nix --experimental-features 'nix-command flakes' flake show
$ nix --experimental-features 'nix-command flakes' build .#ctfp-scala
warning: Git tree '/workspace' is dirty
warning: Ignoring setting 'auto-allocate-uids' because experimental feature 'auto-allocate-uids' is not enabled
warning: Ignoring setting 'impure-env' because experimental feature 'configurable-impure-env' is not enabled
    Then it works fine.
  4. For forking the repository, I remove .git directory and re-initiate for my private git repository.
    # Out of the docker container, because the docker does not have git command 
$ rm -rf .git
$ git init
$ git add .
$ git commit -m "Ready to improve the document."
  5. Then I’ve tried to build it fails.
    $ nix --experimental-features 'nix-command flakes' build .#ctfp-scala
    The error logs are as following:
    warning: Ignoring setting 'auto-allocate-uids' because experimental feature 'auto-allocate-uids' is not enabled
warning: Ignoring setting 'impure-env' because experimental feature 'configurable-impure-env' is not enabled
error: builder for '/nix/store/5fvh085zdfkgq5b9zkx9b5pf1r43i4yc-ctfp-print-scala.drv' failed with exit code 12;
   last 10 log lines:
   > Latexmk: Missing input file 'fig/icons/cc.pdf' (or dependence on it) from following:
   >   LaTeX Warning: File `fig/icons/cc.pdf' not found on input line 48.
   > Latexmk: Log file says output to 'ctfp.xdv'
   > Latexmk: Errors, so I did not complete making targets
   > Collected error summary (may duplicate other messages):
   >   xelatex: Command for 'xelatex' gave return code 1
   >       Refer to 'ctfp.log' and/or above output for details
   >
   > Latexmk: If appropriate, the -f option can be used to get latexmk
   >   to try to force complete processing.
   For full logs, run 'nix log /nix/store/5fvh085zdfkgq5b9zkx9b5pf1r43i4yc-ctfp-print-scala.drv'.
  6. If I remove the .git folder, then it works fine.
    $ rm -rf .git
$ nix --experimental-features 'nix-command flakes' build .#ctfp-scala
warning: Git tree '/workspace' is dirty
warning: Ignoring setting 'auto-allocate-uids' because experimental feature 'auto-allocate-uids' is not enabled
warning: Ignoring setting 'impure-env' because experimental feature 'configurable-impure-env' is not enabled

I did the above steps on Mac Pro M2.

Would anybody show me the workaround?

Thank you.

2

Welcome to the nix world! So basically nix flake tries to maximize purity and reproducibility. So if you have a git repository, nix flake will only consider files in the git repository: this way, if it works locally, it will work once you push the folder online.

Here you can see that it complains Missing input file 'fig/icons/cc.pdf': this means that this file is not in the git repository. This makes sense since *.pdf is present in the .gitignore.

Solution: git add -f fig/icons/cc.pdf (and similarly for all files you want to keep with you) If you just cloned the repo and want to include all files, I guess you can just do git add -f ..

3

It works! Thank you!