fix(nix): pin Rust toolchain to 1.97.1 and refresh manifest hash - #977
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The flake pinned the sha256 of channel-rust-1.97.toml, a mutable file that static.rust-lang.org rewrites on every 1.97.x patch release; the 1.97.1 release changed it and broke nix build with a fixed-output hash mismatch. Pin the exact patch version so fenix fetches the immutable channel-rust-1.97.1.toml, and update the hash to match. Fixes #976 Claude-Session: https://claude.ai/code/session_01VvWzWfEK6oV4HTe6EoGkff
Pinning rust-toolchain.toml to 1.97.1 made rustup auto-install a bare 1.97.1 toolchain in CI instead of using the dtolnay-installed 1.97 one that carried clippy and rustfmt, failing the Clippy step. Declare the components in the toolchain file so any auto-install includes them, and align the workflow toolchain pins to 1.97.1 so CI installs the exact toolchain cargo resolves. Claude-Session: https://claude.ai/code/session_01VvWzWfEK6oV4HTe6EoGkff
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Fixes #976.
nix buildfailed with a fixed-output hash mismatch onchannel-rust-1.97.toml. The flake pinned the sha256 of that channel manifest, butrust/rust-toolchain.tomlused the moving channel1.97— static.rust-lang.org rewriteschannel-rust-1.97.tomlon every 1.97.x patch release, so the Rust 1.97.1 release (2026-07-16 manifest) invalidated the pinned hash.Changes:
rust-toolchain.tomlto the exact version1.97.1, so fenix fetches the immutablechannel-rust-1.97.1.tomland the hash can never drift again within a channel.sha256to the new manifest hash, with a comment noting the exact-patch-pin requirement.Verification: the flat sha256 of the current manifest computed locally is
sha256-A1abGIbOtcBSdrUMhDGrER3pRM1hQP4fp9gh3Y4PKc8=, byte-for-byte matching both thegot:hash reported in #976 andchannel-rust-1.97.1.toml(the two files are identical). CI workflows usedtolnay/rust-toolchainwith1.97and resolve to 1.97.1 independently of this hash, so they are unaffected.This change is