python - 试图从/nix/store 中删除一个包，现在系统出现错误，如何修复？

Question

error: opening file '/nix/store/4h464mkqfipf04jgz4jp3bx56sdn6av0-python3.7-somepackage-1.0.0.drv': No such file or directory

我手动删除了一些文件以尝试删除包。但是 nix-shell 不再起作用并给我上面的消息。我如何解决 nix 中的问题？我想完全删除软件包并重新安装它。
此外，当我运行以下命令时:

~/sources/integration_test >>> nix-env -u python3.7-somepackagesomepackage-1.0.0
error: selector 'python3.7-somepackages-1.0.0' matches no derivations

Answer 1

尝试运行

 nix-store --verify --check-contents --repair

从联机帮助页:

OPERATION --VERIFY
   Synopsis
       nix-store --verify [--check-contents] [--repair]

   Description
       The operation --verify verifies the internal consistency of the Nix database, and the
       consistency between the Nix database and the Nix store. Any inconsistencies
       encountered are automatically repaired. Inconsistencies are generally the result of
       the Nix store or database being modified by non-Nix tools, or of bugs in Nix itself.

       This operation has the following options:

       --check-contents
           Checks that the contents of every valid store path has not been altered by
           computing a SHA-256 hash of the contents and comparing it with the hash stored in
           the Nix database at build time. Paths that have been modified are printed out.
           For large stores, --check-contents is obviously quite slow.

       --repair
           If any valid path is missing from the store, or (if --check-contents is given)
           the contents of a valid path has been modified, then try to repair the path by
           redownloading it. See nix-store --repair-path for details.

注意。 我建议您自己阅读手册页 man nix-store在运行之前确保这是你想要的。
NB.2 由于操作的性质，需要检查很多东西——这个操作需要一段时间。对于我的 11 GiB /nix/store ，这运行了 4 分 13 秒。

附录。 将来，当您想手动从 nix 存储中删除包时，请使用

nix-store --delete /nix/store/[what you want to delete]

反而。