From d1b5fbeb6ccc6b4ad4bf1669c79a74360d5412e6 Mon Sep 17 00:00:00 2001
From: chrysn <chrysn@fsfe.org>
Date: Thu, 18 Nov 2021 09:36:59 +0100
Subject: [PATCH] rust: Track Cargo.lock, treat them as opaque

Cargo.lock files pin the versions of all transitive dependencies, and
are left that way by Cargo unless requested manually (`cargo update`) or
necessitated by a change in dependencies (if the manually maintained
Cargo.toml says `>0.5.2` and .lock says `0.5.1`, the latter is reset).

They are now fixed to ensure that third party changes do not break RIOT
CI builds; for updates, the changes from a `cargo update` can still be
committed and then run through CI checks. (This is analogous to how pkg
versions are pinned).

Lock files are set to binary because their diffs are usually not
practical to read.
---
 .gitattributes                       |   1 +
 .gitignore                           |   7 -
 examples/rust-gcoap/Cargo.lock       | 911 +++++++++++++++++++++++++++
 examples/rust-hello-world/Cargo.lock | 765 ++++++++++++++++++++++
 4 files changed, 1677 insertions(+), 7 deletions(-)
 create mode 100644 examples/rust-gcoap/Cargo.lock
 create mode 100644 examples/rust-hello-world/Cargo.lock

diff --git a/.gitattributes b/.gitattributes
index 9ebeba4883ef8..32985d0606fcd 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,5 +1,6 @@
 *.a binary
 *.patch binary
+Cargo.lock binary
 # Default conflict marker size is 7 which causes some of the headings in
 # release-notes.txt to trigger git diff --check: 'leftover conflict marker'
 # when the heading is exactly 7 characters long.
diff --git a/.gitignore b/.gitignore
index ced8c3a8b4355..44d5b9286c460 100644
--- a/.gitignore
+++ b/.gitignore
@@ -93,10 +93,3 @@ keys/
 
 # custom clang-tidy flags, also used when using clangd language server
 .clang-tidy
-
-# Rust Cargo lock files
-#
-# These would be versioned in full applications, but for demos it's convenient
-# to ignore them. (Also, they'd change easily, causing visual clutter to
-# users).
-Cargo.lock
diff --git a/examples/rust-gcoap/Cargo.lock b/examples/rust-gcoap/Cargo.lock
new file mode 100644
index 0000000000000..33db1760b1ff2
--- /dev/null
+++ b/examples/rust-gcoap/Cargo.lock
@@ -0,0 +1,911 @@
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