1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
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
}
|
