How can I get the hash for a SourceId that is used in ~/.cargo/git/checkouts/?

Or in other words:
How can I get the path to the git sources of a dependency defined in a Cargo.lock file?

I tried:

let source_id = SourceId::from_url(source).unwrap();
let hash = cargo::util::hex::short_hash(&source_id);

But this is different from what I found in the filesystem.

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