bug#56893: rust-vergen inserts build timestamps, possible irreproducibility source

[Maxime Devos]

The following phase works around the issue for me (for antioxidant) -- this makes "guix build --check" pass (at least for antioxidant):

+    ;; TODO: SOURCE_DATE_EPOCH support would be nice.  Also maybe better fit for a snippet?

+    ;;

+    ;; in dependents.
+    ("rust-vergen"
+     ,#~((add-after 'unpack 'remove-timestamp-irreproducibility
+       (lambda _
+         (substitute* (find-files "." "\\.rs$")

+    ;; Make the rust-vergen reproducible and avoid causing irreproducibility +           (("^extern crate chrono;") "extern crate chrono; use chrono::Utc; use chrono::TimeZone;") +           (("^use chrono::Utc;") "use chrono::Utc; use chrono::TimeZone;")

Should also work for cargo-build-system, but untested.

Greetings,
Maxime

OpenPGP_0x49E3EE22191725EE.asc
Description: OpenPGP public key

OpenPGP_signature
Description: OpenPGP digital signature