diff options
Diffstat (limited to 'tvix/eval/src/io.rs')
| -rw-r--r-- | tvix/eval/src/io.rs | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/tvix/eval/src/io.rs b/tvix/eval/src/io.rs index fd0680f3c2a5..627eb848dcba 100644 --- a/tvix/eval/src/io.rs +++ b/tvix/eval/src/io.rs @@ -21,6 +21,9 @@ use crate::errors::ErrorKind; /// Defines how filesystem interaction occurs inside of tvix-eval. pub trait EvalIO { + /// Verify whether the file at the specified path exists. + fn path_exists(&self, path: PathBuf) -> Result<bool, ErrorKind>; + /// Read the file at the specified path to a string. fn read_to_string(&self, path: PathBuf) -> Result<String, ErrorKind>; } @@ -32,8 +35,14 @@ pub struct StdIO; #[cfg(feature = "impure")] impl EvalIO for StdIO { + fn path_exists(&self, path: PathBuf) -> Result<bool, ErrorKind> { + path.try_exists().map_err(|e| ErrorKind::IO { + path: Some(path), + error: std::rc::Rc::new(e), + }) + } + fn read_to_string(&self, path: PathBuf) -> Result<String, ErrorKind> { - let path: PathBuf = path.into(); std::fs::read_to_string(&path).map_err(|e| ErrorKind::IO { path: Some(path), error: std::rc::Rc::new(e), @@ -46,6 +55,12 @@ impl EvalIO for StdIO { pub struct DummyIO; impl EvalIO for DummyIO { + fn path_exists(&self, _: PathBuf) -> Result<bool, ErrorKind> { + Err(ErrorKind::NotImplemented( + "I/O methods are not implemented in DummyIO", + )) + } + fn read_to_string(&self, _: PathBuf) -> Result<String, ErrorKind> { Err(ErrorKind::NotImplemented( "I/O methods are not implemented in DummyIO", |