scripts/cargo-clippy.sh: Extract our non-trivial `cargo clippy` command (#33982)

CI uses a number of parameters when running `cargo clippy`.  Repeating
the same command manually requires some copy/pasting.  It is easier when
there is a common script that can be run by everyone.

ci/test-checks.sh

@@ -69,35 +69,7 @@ fi
 
 _ ci/order-crates-for-publishing.py
 
-nightly_clippy_allows=(--allow=clippy::redundant_clone)
-
-# Use nightly clippy, as frozen-abi proc-macro generates a lot of code across
-# various crates in this whole monorepo (frozen-abi is enabled only under nightly
-# due to the use of unstable rust feature). Likewise, frozen-abi(-macro) crates'
-# unit tests are only compiled under nightly.
-# Similarly, nightly is desired to run clippy over all of bench files because
-# the bench itself isn't stabilized yet...
-#   ref: https://github.com/rust-lang/rust/issues/66287
-_ scripts/cargo-for-all-lock-files.sh -- "+${rust_nightly}" clippy --workspace --all-targets --features dummy-for-ci-check -- \
-  --deny=warnings \
-  --deny=clippy::default_trait_access \
-  --deny=clippy::arithmetic_side_effects \
-  --deny=clippy::manual_let_else \
-  --deny=clippy::used_underscore_binding \
-  "${nightly_clippy_allows[@]}"
-
-# temporarily run stable clippy as well to scan the codebase for
-# `redundant_clone`s, which is disabled as nightly clippy is buggy:
-#   https://github.com/solana-labs/solana/issues/31834
-#
-# can't use --all-targets:
-#   error[E0554]: `#![feature]` may not be used on the stable release channel
-_ scripts/cargo-for-all-lock-files.sh -- clippy --workspace  --tests --bins --examples --features dummy-for-ci-check -- \
-  --deny=warnings \
-  --deny=clippy::default_trait_access \
-  --deny=clippy::arithmetic_side_effects \
-  --deny=clippy::manual_let_else \
-  --deny=clippy::used_underscore_binding
+_ scripts/cargo-clippy.sh
 
 if [[ -n $CI ]]; then
   # exclude from printing "Checking xxx ..."

scripts/cargo-clippy.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+# Runs `cargo clippy` in all individual workspaces in the repository.
+#
+# We have a number of clippy parameters that we want to enforce across the
+# code base.  They are defined here.
+#
+# This script is run by the CI, so if you want to replicate what the CI is
+# doing, better run this script, rather than calling `cargo clippy` manually.
+#
+# TODO It would be nice to provide arguments to narrow clippy checks to a single
+# workspace and/or package.  To speed up the interactive workflow.
+
+set -o errexit
+
+here="$(dirname "$0")"
+cargo="$(readlink -f "${here}/../cargo")"
+
+if [[ -z $cargo ]]; then
+  >&2 echo "Failed to find cargo. Mac readlink doesn't support -f. Consider switching
+  to gnu readlink with 'brew install coreutils' and then symlink greadlink as
+  /usr/local/bin/readlink."
+  exit 1
+fi
+
+# shellcheck source=ci/rust-version.sh
+source "$here/../ci/rust-version.sh"
+
+nightly_clippy_allows=(--allow=clippy::redundant_clone)
+
+# Use nightly clippy, as frozen-abi proc-macro generates a lot of code across
+# various crates in this whole monorepo (frozen-abi is enabled only under nightly
+# due to the use of unstable rust feature). Likewise, frozen-abi(-macro) crates'
+# unit tests are only compiled under nightly.
+# Similarly, nightly is desired to run clippy over all of bench files because
+# the bench itself isn't stabilized yet...
+#   ref: https://github.com/rust-lang/rust/issues/66287
+"$here/cargo-for-all-lock-files.sh" -- \
+  "+${rust_nightly}" clippy \
+  --workspace --all-targets --features dummy-for-ci-check -- \
+  --deny=warnings \
+  --deny=clippy::default_trait_access \
+  --deny=clippy::arithmetic_side_effects \
+  --deny=clippy::manual_let_else \
+  --deny=clippy::used_underscore_binding \
+  "${nightly_clippy_allows[@]}"
+
+# temporarily run stable clippy as well to scan the codebase for
+# `redundant_clone`s, which is disabled as nightly clippy is buggy:
+#   https://github.com/solana-labs/solana/issues/31834
+#
+# can't use --all-targets:
+#   error[E0554]: `#![feature]` may not be used on the stable release channel
+"$here/cargo-for-all-lock-files.sh" -- \
+  clippy \
+  --workspace --tests --bins --examples --features dummy-for-ci-check -- \
+  --deny=warnings \
+  --deny=clippy::default_trait_access \
+  --deny=clippy::arithmetic_side_effects \
+  --deny=clippy::manual_let_else \
+  --deny=clippy::used_underscore_binding