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Mac で再インストールした Nix が使えない

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現象

Mac mini 上の Nix を一度消して再インストールしようとした。

sh <(curl -L https://nixos.org/nix/install)

ここで試しに nix-shell を使ってみたところ、下記のエラーが。

$ nix-shell -p git
error: Nix daemon disconnected unexpectedly (maybe it crashed?)

環境

  • Mac mini (M1, 2020)
  • macOS Sequoia
  • Nix 2.28.0

解決

issue#12011NixOS Discourse で解決法が示されている。

まず、下記の場所にシンボリックリンクがあるはずである。

ls -la /etc/ssl/certs/ca-certificates.crt

出力:

lrwxr-xr-x 1 root wheel 41 Jul 15  2022 /etc/ssl/certs/ca-certificates.crt -> /etc/static/ssl/certs/ca-certificates.crt

しかしこのリンク先ファイルが存在しない。

$ ls /etc/static/ssl/certs/ca-certificates.crt
ls: cannot access '/etc/static/ssl/certs/ca-certificates.crt': No such file or directory

これが理由でデーモンが起動できていない様子なので、正しいファイルへリンクを貼り直してやればよいとのこと。

sudo rm /etc/ssl/certs/ca-certificates.crt
sudo ln -s /nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt /etc/ssl/certs/ca-certificates.crt

動作確認

$ nix-shell -p hello
this path will be fetched (0.02 MiB download, 0.11 MiB unpacked):
  /nix/store/zh4ha2m108qnkzib36mxchngqj4j13hn-hello-2.12.1
copying path '/nix/store/zh4ha2m108qnkzib36mxchngqj4j13hn-hello-2.12.1' from 'https://cache.nixos.org'...

[nix-shell:~/dotfiles]$ hello
Hello, world!

おわり。

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