971080c912
Use it to calculate the text_hash_string, which is then used in the calculate_derivation_path and path_with_references functions. Relates to b/263. Change-Id: I7478825e2a23a11224212fea5e3fd06daa97d5e5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8364 Autosubmit: flokli <flokli@flokli.de> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
42 lines
1.2 KiB
Rust
42 lines
1.2 KiB
Rust
use sha2::{Digest, Sha256};
|
|
|
|
use crate::{nixhash::NixHash, store_path};
|
|
|
|
/// This contains the Nix logic to create "text hash strings", which are used
|
|
/// in `builtins.toFile`, as well as in Derivation Path calculation.
|
|
///
|
|
/// A text hash is calculated by concatenating the following fields, separated by a `:`:
|
|
///
|
|
/// - text
|
|
/// - references, individually joined by `:`
|
|
/// - the nix_hash_string representation of the sha256 digest of some contents
|
|
/// - the value of `storeDir`
|
|
/// - the name
|
|
pub fn text_hash_string<S: AsRef<str>, I: IntoIterator<Item = S>, C: AsRef<[u8]>>(
|
|
name: &str,
|
|
content: C,
|
|
references: I,
|
|
) -> String {
|
|
let mut s = String::from("text:");
|
|
|
|
for reference in references {
|
|
s.push_str(reference.as_ref());
|
|
s.push(':');
|
|
}
|
|
|
|
// the nix_hash_string representation of the sha256 digest of some contents
|
|
s.push_str(
|
|
&{
|
|
let content_digest = {
|
|
let hasher = Sha256::new_with_prefix(content);
|
|
hasher.finalize()
|
|
};
|
|
NixHash::new(crate::nixhash::HashAlgo::Sha256, content_digest.to_vec())
|
|
}
|
|
.to_nix_hash_string(),
|
|
);
|
|
|
|
s.push_str(&format!(":{}:{}", store_path::STORE_DIR, name));
|
|
|
|
s
|
|
}
|