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Disallow setting the PWD via load-env input (#12522)

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# Description
Fixes #12520


# User-Facing Changes
Breaking change:

Any operation parsing input with `PWD` to set the environment will now
fail with `ShellError::AutomaticEnvVarSetManually`

Furthermore transactions containing the special env-vars will be
rejected before executing any modifications. Prevoiusly this was
changing valid variables before while leaving valid variables after the
violation untouched.

## `PWD` handling.

Now failing

```
{PWD: "/trolling"} | load-env
``` 

already failing 

```
load-env {PWD: "/trolling"}
``` 

## Error management



```
> load-env {MY_VAR1: foo, PWD: "/trolling", MY_VAR2: bar}
Error: nu:🐚:automatic_env_var_set_manually

  × PWD cannot be set manually.
   ╭─[entry #1:1:2]
 1 │  load-env {MY_VAR1: foo, PWD: "/trolling", MY_VAR2: bar}
   ·  ────┬───
   ·      ╰── cannot set 'PWD' manually
   ╰────
  help: The environment variable 'PWD' is set automatically by Nushell and cannot be set manually.
```

### Before:
```
> $env.MY_VAR1
foo
> $env.MY_VAR2
Error: nu:🐚:name_not_found
....
```
### After:
```
> $env.MY_VAR1
Error: nu:🐚:name_not_found
....
> $env.MY_VAR2
Error: nu:🐚:name_not_found
....
```

# After Submitting
We need to check if any integrations rely on this hack.
This commit is contained in:
Stefan Holderbach 2024-04-15 21:09:58 +02:00 committed by GitHub
parent c06ef201b7
commit 078ba5aabe
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GPG key ID: B5690EEEBB952194
1 changed files with 25 additions and 44 deletions
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65
crates/nu-command/src/env/load_env.rs vendored
View file

@ -1,4 +1,4 @@
use nu_engine::{command_prelude::*, current_dir};
use nu_engine::command_prelude::*;
#[derive(Clone)]
pub struct LoadEnv;
@ -37,53 +37,34 @@ impl Command for LoadEnv {
let arg: Option<Record> = call.opt(engine_state, stack, 0)?;
let span = call.head;
match arg {
Some(record) => {
for (env_var, rhs) in record {
let env_var_ = env_var.as_str();
if ["FILE_PWD", "CURRENT_FILE", "PWD"].contains(&env_var_) {
return Err(ShellError::AutomaticEnvVarSetManually {
envvar_name: env_var,
span: call.head,
});
}
stack.add_env_var(env_var, rhs);
}
Ok(PipelineData::empty())
}
let record = match arg {
Some(record) => record,
None => match input {
PipelineData::Value(Value::Record { val, .. }, ..) => {
for (env_var, rhs) in val.into_owned() {
let env_var_ = env_var.as_str();
if ["FILE_PWD", "CURRENT_FILE"].contains(&env_var_) {
return Err(ShellError::AutomaticEnvVarSetManually {
envvar_name: env_var,
span: call.head,
});
}
if env_var == "PWD" {
let cwd = current_dir(engine_state, stack)?;
let rhs = rhs.coerce_into_string()?;
let rhs = nu_path::expand_path_with(rhs, cwd, true);
stack.add_env_var(
env_var,
Value::string(rhs.to_string_lossy(), call.head),
);
} else {
stack.add_env_var(env_var, rhs);
}
}
Ok(PipelineData::empty())
}
_ => Err(ShellError::UnsupportedInput {
PipelineData::Value(Value::Record { val, .. }, ..) => val.into_owned(),
_ => {
return Err(ShellError::UnsupportedInput {
msg: "'load-env' expects a single record".into(),
input: "value originated from here".into(),
msg_span: span,
input_span: input.span().unwrap_or(span),
}),
},
})
}
},
};
for prohibited in ["FILE_PWD", "CURRENT_FILE", "PWD"] {
if record.contains(prohibited) {
return Err(ShellError::AutomaticEnvVarSetManually {
envvar_name: prohibited.to_string(),
span: call.head,
});
}
}
for (env_var, rhs) in record {
stack.add_env_var(env_var, rhs);
}
Ok(PipelineData::empty())
}
fn examples(&self) -> Vec<Example> {