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feat(nix-compat/derivation): simplify derivation_or_fod_hash

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Populate the input_derivations struct field in-place, using
self.input_derivations.from_iter, which seems a bit more readable.

Change-Id: I4aa12cfd66e08486ef27aedab1bb731d94b63657
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10934
Reviewed-by: flokli <flokli@flokli.de>
Reviewed-by: Peter Kolloch <info@eigenvalue.net>
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
This commit is contained in:
Florian Klink 2024-02-17 11:18:03 +07:00 committed by flokli
parent c7875cfc12
commit 3d51b20cca
1 changed files with 22 additions and 29 deletions
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51
tvix/nix-compat/src/derivation/mod.rs
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@ -160,40 +160,35 @@ impl Derivation {
///
/// If the derivation is not a fixed derivation, it's up to the caller of
/// this function to provide a lookup function to lookup these calculation
/// results of parent derivations at `fn_get_hash_derivation_modulo` (by
/// results of parent derivations at `fn_get_derivation_or_fod_hash` (by
/// drv path).
pub fn derivation_or_fod_hash<F>(&self, fn_get_derivation_or_fod_hash: F) -> NixHash
where
F: Fn(&StorePathRef) -> NixHash,
{
// Fixed-output derivations return a fixed hash.
// Non-Fixed-output derivations return a hash of the ATerm notation, but with all
// input_derivation paths replaced by a recursive call to this function.
// Non-Fixed-output derivations return the sha256 digest of the ATerm
// notation, but with all input_derivation paths replaced by a recursive
// call to this function.
// We use fn_get_derivation_or_fod_hash here, so callers can precompute this.
let digest = self.fod_digest().unwrap_or({
// This is a new map from derivation_or_fod_hash.digest (as lowerhex)
// to list of output names
let mut replaced_input_derivations: BTreeMap<String, BTreeSet<String>> =
BTreeMap::new();
// For each input_derivation, look up the
// derivation_or_fod_hash, and replace the derivation path with it's HEXLOWER
// digest.
// This is not the [NixHash::to_nix_hash_string], but without the sha256: prefix).
for (drv_path_str, output_names) in &self.input_derivations {
// parse drv_path to StorePathRef
let drv_path = StorePathRef::from_absolute_path(drv_path_str.as_bytes())
.expect("invalid input derivation path");
replaced_input_derivations.insert(
data_encoding::HEXLOWER
.encode(fn_get_derivation_or_fod_hash(&drv_path).digest_as_bytes()),
output_names.clone(),
);
}
// construct a new derivation struct with these replaced input derivation strings
NixHash::Sha256(self.fod_digest().unwrap_or({
// construct a new Derivation struct with input derivation strings replaced.
let replaced_derivation = Derivation {
input_derivations: replaced_input_derivations,
// For each input_derivation, look up the
// derivation_or_fod_hash, and replace the derivation path with
// it's HEXLOWER digest.
input_derivations: BTreeMap::from_iter(self.input_derivations.iter().map(
|(drv_path_str, output_names)| {
// parse drv_path to StorePathRef
let drv_path = StorePathRef::from_absolute_path(drv_path_str.as_bytes())
.expect("invalid input derivation path");
let encoded_hash = data_encoding::HEXLOWER
.encode(fn_get_derivation_or_fod_hash(&drv_path).digest_as_bytes());
(encoded_hash, output_names.to_owned())
},
)),
..self.clone()
};
@ -202,9 +197,7 @@ impl Derivation {
hasher.update(replaced_derivation.to_aterm_bytes());
hasher.finalize().into()
});
NixHash::Sha256(digest)
}))
}
/// This calculates all output paths of a Derivation and updates the struct.