From 313460c97f17300493cf63203902bf45dd670462 Mon Sep 17 00:00:00 2001
From: Matthew Jackson <1085847+MattJackson@users.noreply.github.com>
Date: Tue, 18 Aug 2026 12:14:58 -0700
Subject: [PATCH] ci: stop Dependabot proposing Rust versions that do not exist
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`dtolnay/rust-toolchain` is not a dependency in the sense Dependabot
means: it is versioned by the Rust release it installs, and the tag we
pin is the toolchain CI is pinned to on purpose — precommit.sh runs the
same one locally, so a lint that passes on a developer's newer default
cannot pass CI by accident.

Read as semver, those tags produced a 1.97.0 -> 1.100.0 proposal, a Rust
version that does not exist. Every such PR 404s on toolchain download
across all eight repos and regenerates weekly: eight permanently-red PRs
that promote.yml then has to special-case when it decides whether dev is
green.

freemkv already carries this ignore; this is the same block in the other
seven, so the fleet stays uniform. Bumping the toolchain stays a
deliberate, all-eight-repos change made by hand together with
precommit.sh.
---
 .github/dependabot.yml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index dc7ed1b..4732e6b 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -46,3 +46,18 @@ updates:
         update-types:
           - minor
           - patch
+    ignore:
+      # NOT a dependency: `dtolnay/rust-toolchain` is versioned by the RUST
+      # release it installs, and the tag we pin is the toolchain CI is pinned
+      # to on purpose -- precommit.sh runs the same one locally so a lint that
+      # passes on a developer's newer default cannot pass CI by accident.
+      #
+      # Dependabot reads those tags as semver and proposed 1.97.0 -> 1.100.0,
+      # a Rust version that does not exist. Every such PR 404s on toolchain
+      # download across all eight repos, and they regenerate weekly -- eight
+      # permanently-red PRs that promote.yml then has to special-case when it
+      # decides whether dev is green.
+      #
+      # Bumping the toolchain is a deliberate, all-eight-repos change, made by
+      # hand together with precommit.sh. There is nothing here for a bot.
+      - dependency-name: dtolnay/rust-toolchain