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feat(tvix/nix-compat): fold NameError into Error

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This being a nested error makes things more complicated than necessary.

Also, this caused BuildStorePathError to only hold NameError,
so refactor these utility functions to either return Error, or
BuildStorePathError.

Change-Id: I046fb403780cc5135df8b8833a291fc2a90fd913
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8972
Tested-by: BuildkiteCI
Autosubmit: flokli <flokli@flokli.de>
Reviewed-by: tazjin <tazjin@tvl.su>
This commit is contained in:
Florian Klink 2023-07-18 20:46:55 +03:00 • committed by clbot
parent 728de762fd
commit 5364fcb127
4 changed files with 27 additions and 39 deletions
Download patch file Download diff file Expand all files Collapse all files

35
tvix/nix-compat/src/store_path/mod.rs
View file

@ -23,23 +23,12 @@ pub enum Error {
MissingDash(),
#[error("Hash encoding is invalid: {0}")]
InvalidHashEncoding(Nixbase32DecodeError),
#[error("{0}")]
InvalidName(NameError),
#[error("Tried to parse an absolute path which was missing the store dir prefix.")]
MissingStoreDir(),
}
/// Errors that can occur during the validation of name characters.
#[derive(Debug, PartialEq, Eq, Error)]
pub enum NameError {
#[error("Invalid length")]
InvalidLength(),
#[error("Invalid name: {0}")]
InvalidName(String),
}
impl From<NameError> for Error {
fn from(e: NameError) -> Self {
Self::InvalidName(e)
}
#[error("Tried to parse an absolute path which was missing the store dir prefix.")]
MissingStoreDir(),
}
/// Represents a path in the Nix store (a direct child of [STORE_DIR]).
@ -69,7 +58,7 @@ impl StorePath {
// - 1 dash
// - 1 character for the name
if s.len() < ENCODED_DIGEST_SIZE + 2 {
Err(NameError::InvalidName("".to_string()))?;
Err(Error::InvalidLength())?
}
let digest = match nixbase32::decode(s[..ENCODED_DIGEST_SIZE].as_bytes()) {
@ -120,10 +109,10 @@ impl StorePath {
let rest_buf: PathBuf = it.collect();
Ok((store_path, rest_buf))
} else {
Err(Error::InvalidName(NameError::InvalidName("".to_string())))
Err(Error::InvalidName("".to_string()))
}
} else {
Err(Error::InvalidName(NameError::InvalidName("".to_string())))
Err(Error::InvalidName("".to_string()))
}
}
}
@ -137,7 +126,7 @@ impl StorePath {
}
/// Checks a given &str to match the restrictions for store path names.
pub fn validate_name(s: &str) -> Result<(), NameError> {
pub fn validate_name(s: &str) -> Result<(), Error> {
for c in s.chars() {
if c.is_ascii_alphanumeric()
|| c == '-'
@ -150,7 +139,7 @@ impl StorePath {
continue;
}
return Err(NameError::InvalidName(s.to_string()));
return Err(Error::InvalidName(s.to_string()));
}
Ok(())
@ -174,7 +163,7 @@ mod tests {
use crate::store_path::{DIGEST_SIZE, ENCODED_DIGEST_SIZE};
use test_case::test_case;
use super::{Error, NameError, StorePath};
use super::{Error, StorePath};
#[test]
fn encoded_digest_size() {
@ -276,11 +265,11 @@ mod tests {
#[test]
fn from_absolute_path_errors() {
assert_eq!(
Error::InvalidName(NameError::InvalidName("".to_string())),
Error::InvalidName("".into()),
StorePath::from_absolute_path_full("/nix/store/").expect_err("must fail")
);
assert_eq!(
Error::InvalidName(NameError::InvalidName("".to_string())),
Error::InvalidLength(),
StorePath::from_absolute_path_full("/nix/store/foo").expect_err("must fail")
);
assert_eq!(