Devenv builds and initializations are slow

[SamoylovMD]

Describe the bug I am facing an issue with devenv shell overall performance. Running devenv shell right after devenv init (no other changes in the code) takes really long time, ~1 minute usually. Moreover, the time is the same on each run. This behaviour is the same for my real projects.

Related Discord thread

To reproduce

1. Create a new empty folder and change to it
2. Run devenv init
3. Run devenv shell and wait for initialization
4. Exit from shell and run devenv shell again

Version

➜ devenv-test-3 devenv version devenv 1.0.2 (x86_64-darwin) ➜ devenv-test-3 direnv --version 2.34.0 ➜ devenv-test-3 cachix --version cachix 1.7 ➜ devenv-test-3 nix --version nix (Nix) 2.21.0

MacOS Sonoma 14.3, Intel-based, zsh.

Logs

devenv.log

[domenkozar]

Do you have SSD?

[SamoylovMD]

@domenkozar Yes, I also can provide some other hardware stats if it helps

[domenkozar]

Can you pass -v to devenv and paste the logs?

[SamoylovMD]

Here it is:

➜  devenv-test-3  devenv -v shell
• Building shell ...
• Using Cachix: devenv
• Running command: nix --show-trace --extra-experimental-features nix-command --extra-experimental-features flakes --option warn-dirty false --option eval-cache false --keep-going --max-jobs 6 print-dev-env --profile /Users/maksims/tmp/devenv-test-3/.devenv/gc/shell --option extra-substituters https://devenv.cachix.org --option extra-trusted-public-keys devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=
• Creating symlink /nix/store/mkf4rrcqpahfb2m1z7y8y4mhahpmdr30-devenv-shell-env -> /Users/maksims/.local/share/devenv/gc/1712571332.248852000-shell
✔ Building shell in 40.6s.
• Entering shell
• Running command: nix --show-trace --extra-experimental-features nix-command --extra-experimental-features flakes --option warn-dirty false --option eval-cache false --keep-going --max-jobs 6 develop /Users/maksims/tmp/devenv-test-3/.devenv/gc/shell
✨ devenv 1.0.2 is out of date. Please update to 1.0.3: https://devenv.sh/getting-started/#installation
hello from devenv
git version 2.43.2

I noticed that it downloaded some tar.gz from NixOS github for a very long time (~5-10 minutes or so), while the size of a file was around 40Mb, which with my network bandwidth should have been downloaded in less than 1 second. But other stages are slow too.

[domenkozar]

What happens if you run nix --show-trace --extra-experimental-features nix-command --extra-experimental-features flakes --option warn-dirty false --option eval-cache false --keep-going --max-jobs 6 print-dev-env --profile /Users/maksims/tmp/devenv-test-3/.devenv/gc/shell --option extra-substituters https://devenv.cachix.org --option extra-trusted-public-keys devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw= and how long does it take?

[SamoylovMD]

@domenkozar I executed the command as-is, and it printed:

path '/Users/maksims/tmp/devenv-test-3' does not contain a 'flake.nix', searching up error: could not find a flake.nix file

[domenkozar]

You need to run it in the same directory.

[SamoylovMD]

Same with what exactly? I ran the command in the root directory of my project with devenv:

(devenv) prgm-msamoilov2:devenv-test-3 maksims$ pwd /Users/maksims/tmp/devenv-test-3 (devenv) prgm-msamoilov2:devenv-test-3 maksims$ ls -la total 36 drwxr-xr-x 11 maksims staff 352 Apr 5 13:17 . drwxr-xr-x 13 maksims staff 416 Apr 15 16:52 .. drwxr-xr-x 9 maksims staff 288 Apr 5 13:02 .devenv -rw-r--r-- 1 maksims staff 5146 Apr 8 12:14 .devenv.flake.nix drwxr-xr-x 4 maksims staff 128 Apr 5 13:05 .direnv -rw-r--r-- 1 maksims staff 176 Apr 5 13:02 .envrc -rw-r--r-- 1 maksims staff 91 Apr 5 13:02 .gitignore -rw-r--r-- 1 maksims staff 4028 Apr 5 13:02 devenv.lock -rw-r--r-- 1 maksims staff 5082 Apr 5 13:17 devenv.log -rw-r--r-- 1 maksims staff 749 Apr 5 13:02 devenv.nix -rw-r--r-- 1 maksims staff 341 Apr 5 13:02 devenv.yaml (devenv) prgm-msamoilov2:devenv-test-3 maksims$ nix --show-trace --extra-experimental-features nix-command --extra-experimental-features flakes --option warn-dirty false --option eval-cache false --keep-going --max-jobs 6 print-dev-env --profile /Users/maksims/tmp/devenv-test-3/.devenv/gc/shell --option extra-substituters https://devenv.cachix.org --option extra-trusted-public-keys devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw= path '/Users/maksims/tmp/devenv-test-3' does not contain a 'flake.nix', searching up error: could not find a flake.nix file