build/cargo-build-system: Patch cargo checksums.

* guix/build/cargo-build-system.scm (generate-all-checksums): New
procedure.
(update-cargo-lock, patch-cargo-checksums): New phases.
(%standard-phases): Add 'update=cargo-lock after 'configure and
'patch-cargo-checksums after 'patch-generated-file-shebangs.
* doc/guix.texi (Build System)[cargo-build-system]: Mention how
Cargo.lock files are handled.

1 files changed, 5 insertions, 2 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index ccc36a8a97..cb60d5c7b7 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -5854,8 +5854,11 @@ should be added to the package definition via the
 
 In its @code{configure} phase, this build system will make any source inputs
 specified in the @code{#:cargo-inputs} and @code{#:cargo-development-inputs}
-parameters available to cargo.  The @code{install} phase installs any crate
-the binaries if they are defined by the crate.
+parameters available to cargo.  The @code{update-cargo-lock} phase will,
+when there is a @code{Cargo.lock} file, update the @code{Cargo.lock} file
+with the inputs and their versions available at build time.  The
+@code{install} phase installs any crate the binaries if they are defined by
+the crate.
 @end defvr
 
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