@@ -55,6 +55,32 @@
#:use-module (ice-9 match)
#:use-module (srfi srfi-26))
+;; This is the hash for the empty file, and the reason it's relevant is not
+;; the most obvious.
+;;
+;; The root of the problem is that Cargo keeps track of a file called
+;; Cargo.lock, that contains the hash of the tarball source of each dependency.
+;;
+;; However, tarball sources aren't handled well by Guix because of the need to
+;; patch shebangs in any helper scripts. This is why we use Cargo's vendoring
+;; capabilities, where instead of the tarball, a directory is provided in its
+;; place. (In the case of rustc, the source code already ships with vendored
+;; dependencies, but crates built with cargo-build-system undergo vendoring
+;; during the build.)
+;;
+;; To preserve the advantages of checksumming, vendored dependencies contain
+;; a file called .cargo-checksum.json, which contains the hash of the tarball,
+;; as well as the list of files in it, with the hash of each file.
+;;
+;; The patch-cargo-checksums phase of cargo-build-system runs after
+;; any Guix-specific patches to the vendored dependencies and regenerates the
+;; .cargo-checksum.json files, but it's hard to know the tarball checksum that
+;; should be written to the file - and taking care of any unhandled edge case
+;; would require rebuilding everything that depends on rust. This is why we lie,
+;; and say that the tarball has the hash of an empty file. It's not a problem
+;; because cargo-build-system removes the Cargo.lock file. We can't do that
+;; for rustc because of a quirk of its build system, so we modify the lock file
+;; to substitute the hash.
(define %cargo-reference-hash
"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
@@ -1130,4 +1156,24 @@ move around."
(("ignore-sgx") "ignore-sgx\n// ignore-tidy-linelength"))
#t)))))))))
+(define-public rust-1.39
+ (let ((base-rust
+ (rust-bootstrapped-package rust-1.38 "1.39.0"
+ "0mwkc1bnil2cfyf6nglpvbn2y0zfbv44zfhsd5qg4c9rm6vgd8dl")))
+ (package
+ (inherit base-rust)
+ (arguments
+ (substitute-keyword-arguments (package-arguments base-rust)
+ ((#:phases phases)
+ `(modify-phases ,phases
+ (replace 'patch-cargo-checksums
+ ;; The Cargo.lock format changed.
+ (lambda* _
+ (use-modules (guix build cargo-utils))
+ (substitute* "Cargo.lock"
+ (("(checksum = )\".*\"" all name)
+ (string-append name "\"" ,%cargo-reference-hash "\"")))
+ (generate-all-checksums "vendor")
+ #t)))))))))
+
(define-public rust rust-1.37)