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refactor(tvix/nix-compat): introduce CaHash::algo_str

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This is the `{fixed,fixed:r,text}:{sha*,md5}` prefix used in various
string representations.

Factor that code out, and use it in the two places it can be used in.

Change-Id: Ic9555fa9e1884198d435e55c7f630b8d3ba2a032
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12041
Autosubmit: flokli <flokli@flokli.de>
Tested-by: BuildkiteCI
Reviewed-by: Brian Olsen <me@griff.name>
This commit is contained in:
Florian Klink 2024-07-27 13:04:29 +03:00 • committed by clbot
parent 5114504b67
commit c8f92c6e9f
2 changed files with 27 additions and 28 deletions
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32
tvix/nix-compat/src/nixhash/ca_hash.rs
View file

@ -47,6 +47,26 @@ impl CAHash {
}
}
/// Returns a colon-separated string consisting of mode, recursiveness and
/// hash algo. Used as a prefix in various string representations.
pub fn algo_str(&self) -> &'static str {
match self.mode() {
HashMode::Flat => match self.hash().as_ref() {
NixHash::Md5(_) => "fixed:md5",
NixHash::Sha1(_) => "fixed:sha1",
NixHash::Sha256(_) => "fixed:sha256",
NixHash::Sha512(_) => "fixed:sha512",
},
HashMode::Nar => match self.hash().as_ref() {
NixHash::Md5(_) => "fixed:r:md5",
NixHash::Sha1(_) => "fixed:r:sha1",
NixHash::Sha256(_) => "fixed:r:sha256",
NixHash::Sha512(_) => "fixed:r:sha512",
},
HashMode::Text => "text:sha256",
}
}
/// Constructs a [CAHash] from the textual representation,
/// which is one of the three:
/// - `text:sha256:$nixbase32sha256digest`
@ -76,13 +96,11 @@ impl CAHash {
/// Formats a [CAHash] in the Nix default hash format, which is the format
/// that's used in NARInfos for example.
pub fn to_nix_nixbase32_string(&self) -> String {
match self {
CAHash::Flat(nh) => format!("fixed:{}", nh.to_nix_nixbase32_string()),
CAHash::Nar(nh) => format!("fixed:r:{}", nh.to_nix_nixbase32_string()),
CAHash::Text(digest) => {
format!("text:sha256:{}", nixbase32::encode(digest))
}
}
format!(
"{}:{}",
self.algo_str(),
nixbase32::encode(self.hash().digest_as_bytes())
)
}
/// This takes a serde_json::Map and turns it into this structure. This is necessary to do such