refactor(tvix/cli): use nixhash module for output hash calculation

This covers all the weird corner cases.

Change-Id: I85637e82e8929828064ab562dc8a1c8bf161fffa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7991
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

tvix/cli/src/errors.rs

@@ -1,9 +1,9 @@
-use nix_compat::derivation::DerivationError;
+use nix_compat::{derivation::DerivationError, nixhash};
 use std::rc::Rc;
 use thiserror::Error;
 
 /// Errors related to derivation construction
-#[derive(Debug, Error, PartialEq)]
+#[derive(Debug, Error)]
 pub enum Error {
     #[error("an output with the name '{0}' is already defined")]
     DuplicateOutput(String),
@@ -15,18 +15,10 @@ pub enum Error {
     ShadowedOutput(String),
     #[error("invalid derivation parameters: {0}")]
     InvalidDerivation(DerivationError),
+    #[error("invalid output hash: {0}")]
+    InvalidOutputHash(nixhash::Error),
     #[error("invalid output hash mode: '{0}', only 'recursive' and 'flat` are supported")]
     InvalidOutputHashMode(String),
-    #[error("unsupported sri algorithm: {0}, only sha1, sha256 or sha512 is supported")]
-    UnsupportedSRIAlgo(String),
-    #[error("invalid number of sri hashes in string ({0}), only one hash is supported")]
-    UnsupportedSRIMultiple(usize),
-    #[error("invalid sri digest: {0}")]
-    InvalidSRIDigest(data_encoding::DecodeError),
-    #[error("failed to parse SRI string: {0}")]
-    InvalidSRIString(String),
-    #[error("outputHashAlgo is set to {0}, but outputHash contains SRI with algo {1}")]
-    ConflictingSRIHashAlgo(String, String),
 }
 
 impl From<Error> for tvix_eval::ErrorKind {