refactor(tvix/nix-compat): rename NixHashWithMode -> CAHash r/6871

This specific struct is only used to represent content-addressed paths
(in case a Derivation has a fixed-output hash, for example).
Rename `Output`'s `hash_with_mode` to `ca_hash`.

We now also include `CAHash::Text`, and update the `validate` function
of the `Output` struct to reject text hashes there.

This allows cleaning up the various output path calculation functions
inside nix-compat/src/store_path/utils.rs, as they can now match on
the type.

`make_type` is renamed to `make_references_string`,
`build_regular_ca_path` is renamed to `build_ca_path`, and
`build_text_path` has a disclaimer added, because you might not actually
want to use it.

Change-Id: I674d065f2ed5c804012ddfed56e161ac49d23931
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9814
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>

1 files changed, 5 insertions, 5 deletions

diff --git a/tvix/cli/src/derivation.rs b/tvix/cli/src/derivation.rs
index 76cc3f60f77e..15df6ed76102 100644
--- a/tvix/cli/src/derivation.rs
+++ b/tvix/cli/src/derivation.rs
@@ -115,7 +115,7 @@ fn populate_output_configuration(
 ) -> Result<(), ErrorKind> {
     // We only do something when `digest` and `algo` are `Some(_)``, and
     // there's an `out` output.
-    if let (Some(hash), Some(algo), hash_mode) = (hash, hash_algo, hash_mode) {
+    if let (Some(nixhash_str), Some(algo), hash_mode) = (hash, hash_algo, hash_mode) {
         match drv.outputs.get_mut("out") {
             None => return Err(Error::ConflictingOutputTypes.into()),
             Some(out) => {
@@ -126,12 +126,12 @@ fn populate_output_configuration(
                     Some(algo.as_ref())
                 };
 
-                let output_hash = nixhash::from_str(&hash, a).map_err(Error::InvalidOutputHash)?;
+                let hash = nixhash::from_str(&nixhash_str, a).map_err(Error::InvalidOutputHash)?;
 
                 // construct the NixHashWithMode.
-                out.hash_with_mode = match hash_mode.as_deref() {
-                    None | Some("flat") => Some(nixhash::NixHashWithMode::Flat(output_hash)),
-                    Some("recursive") => Some(nixhash::NixHashWithMode::Recursive(output_hash)),
+                out.ca_hash = match hash_mode.as_deref() {
+                    None | Some("flat") => Some(nixhash::CAHash::Flat(hash)),
+                    Some("recursive") => Some(nixhash::CAHash::Nar(hash)),
                     Some(other) => {
                         return Err(Error::InvalidOutputHashMode(other.to_string()).into())
                     }