mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-22 14:06:16 +02:00
64 lines
1.9 KiB
Markdown
64 lines
1.9 KiB
Markdown
---
|
|
synopsis: "`nix-shell` shebang uses relative path"
|
|
prs:
|
|
- 5088
|
|
- 11058
|
|
issues:
|
|
- 4232
|
|
---
|
|
|
|
<!-- unfortunately no link target for the specific syntax -->
|
|
Relative [path](@docroot@/language/types.md#type-path) literals in `nix-shell` shebang scripts' options are now resolved relative to the [script's location](@docroot@/glossary.md?highlight=base%20directory#gloss-base-directory).
|
|
Previously they were resolved relative to the current working directory.
|
|
|
|
For example, consider the following script in `~/myproject/say-hi`:
|
|
|
|
```shell
|
|
#!/usr/bin/env nix-shell
|
|
#!nix-shell --expr 'import ./shell.nix'
|
|
#!nix-shell --arg toolset './greeting-tools.nix'
|
|
#!nix-shell -i bash
|
|
hello
|
|
```
|
|
|
|
Older versions of `nix-shell` would resolve `shell.nix` relative to the current working directory; home in this example:
|
|
|
|
```console
|
|
[hostname:~]$ ./myproject/say-hi
|
|
error:
|
|
… while calling the 'import' builtin
|
|
at «string»:1:2:
|
|
1| (import ./shell.nix)
|
|
| ^
|
|
|
|
error: path '/home/user/shell.nix' does not exist
|
|
```
|
|
|
|
Since this release, `nix-shell` resolves `shell.nix` relative to the script's location, and `~/myproject/shell.nix` is used.
|
|
|
|
```console
|
|
$ ./myproject/say-hi
|
|
Hello, world!
|
|
```
|
|
|
|
**Opt-out**
|
|
|
|
This is technically a breaking change, so we have added an option so you can adapt independently of your Nix update.
|
|
The old behavior can be opted into by setting the option [`nix-shell-shebang-arguments-relative-to-script`](@docroot@/command-ref/conf-file.md#conf-nix-shell-shebang-arguments-relative-to-script) to `false`.
|
|
This option will be removed in a future release.
|
|
|
|
**`nix` command shebang**
|
|
|
|
The experimental [`nix` command shebang](@docroot@/command-ref/new-cli/nix.md?highlight=shebang#shebang-interpreter) already behaves in this script-relative manner.
|
|
|
|
Example:
|
|
|
|
```shell
|
|
#!/usr/bin/env nix
|
|
#!nix develop
|
|
#!nix --expr ``import ./shell.nix``
|
|
#!nix -c bash
|
|
hello
|
|
```
|
|
|
|
Author: [**Robert Hensing (@roberth)**](https://github.com/roberth)
|