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Use nix-shell --pure to avoid running externally installed tools

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Noam Yorav-Raphael 2024-04-12 11:07:45 +03:00
parent 11f9dce51f
commit 7e1acc8877
1 changed files with 4 additions and 2 deletions
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6
pills/10-developing-with-nix-shell.md
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@ -15,13 +15,15 @@ Recall that in a nix environment, we don't have access to libraries or programs
We can call `nix-shell` on any Nix expression which returns a derivation, but the resulting `bash` shell's `PATH` does not have the utilities we want: We can call `nix-shell` on any Nix expression which returns a derivation, but the resulting `bash` shell's `PATH` does not have the utilities we want:
```console ```console
$ nix-shell hello.nix $ nix-shell --pure hello.nix
[nix-shell]$ make [nix-shell]$ make
bash: make: command not found bash: make: command not found
[nix-shell]$ echo $baseInputs [nix-shell]$ echo $baseInputs
/nix/store/jff4a6zqi0yrladx3kwy4v6844s3swpc-gnutar-1.27.1 [...] /nix/store/jff4a6zqi0yrladx3kwy4v6844s3swpc-gnutar-1.27.1 [...]
``` ```
(`--pure` asks `nix-shell` to remove most environment variables before running the shell. Without adding it, `make` might work, but it will be taken from your environment, so it might have a different behavior during build.)
This shell is rather useless. It would be reasonable to expect that the GNU `hello` build inputs are available in `PATH`, including GNU `make`, but this is not the case. This shell is rather useless. It would be reasonable to expect that the GNU `hello` build inputs are available in `PATH`, including GNU `make`, but this is not the case.
However, we do have the environment variables that we set in the derivation, like `$baseInputs`, `$buildInputs`, `$src`, and so on. However, we do have the environment variables that we set in the derivation, like `$baseInputs`, `$buildInputs`, `$src`, and so on.
@ -154,7 +156,7 @@ mkDerivation {
Now back to nix-shell: Now back to nix-shell:
```console ```console
$ nix-shell hello.nix $ nix-shell --pure hello.nix
[nix-shell]$ source $setup [nix-shell]$ source $setup
[nix-shell]$ [nix-shell]$
``` ```