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use super::encoding::EncodablePackage;
use crate::{
error::{Error, ErrorKind},
metadata::Metadata,
};
use serde::{Deserialize, Serialize};
use std::str::FromStr;
#[derive(Copy, Clone, Debug, Deserialize, Eq, Hash, PartialEq, PartialOrd, Ord, Serialize)]
pub enum ResolveVersion {
V1,
V2,
}
impl ResolveVersion {
pub(super) fn detect(
packages: &[EncodablePackage],
metadata: &Metadata,
) -> Result<Self, Error> {
let is_v1 = metadata.keys().any(|key| key.is_checksum());
let is_v2 = packages.iter().any(|package| package.checksum.is_some());
if is_v1 && is_v2 {
fail!(ErrorKind::Parse, "malformed lockfile: contains checksums in both [[package]] and [[metadata]] sections");
}
if is_v1 {
Ok(ResolveVersion::V1)
} else {
Ok(ResolveVersion::V2)
}
}
}
impl Default for ResolveVersion {
fn default() -> Self {
ResolveVersion::V2
}
}
impl FromStr for ResolveVersion {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Error> {
match s {
"1" => Ok(ResolveVersion::V1),
"2" => Ok(ResolveVersion::V2),
_ => fail!(
ErrorKind::Parse,
"invalid Cargo.lock format version: `{}`",
s
),
}
}
}