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gnu: rust: Add 1.39

* gnu/packages/rust.scm (rust-1.39): New variable.
  (%cargo-reference-hash): Add a comment explaining the role of the
Jakub Kądziołka 2 years ago
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  1. 46


@ -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
@ -1130,4 +1156,24 @@ move around."
(("ignore-sgx") "ignore-sgx\n// ignore-tidy-linelength"))
(define-public rust-1.39
(let ((base-rust
(rust-bootstrapped-package rust-1.38 "1.39.0"
(inherit base-rust)
(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")
(define-public rust rust-1.37)