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7f465fac2a
Hermit's rustup package sets CARGO_HOME to ${HERMIT_ENV}/.hermit/rust.
Swatinem/rust-cache keeps only target/ outputs for packages whose manifest
is outside the workspace root, so every registry crate looked like a
workspace member and each root-workspace cache saved an empty target/
(1303 B on main for unit-tests, rust-lint, cross, relay-e2e, and mesh
lifecycle). The exact-key hit then blocked every later save.
Set CARGO_HOME to ${HOME}/.cargo-hermit (and its bin/ on PATH) in
bin/hermit.hcl. Hermit applies that env whenever it execs cargo, so a
workflow-level CARGO_HOME export cannot do this; the environment config
fixes CI and local alike. The rust-cache contract pins it, and
bin/hermit.hcl now selects the Rust CI lanes.
Consolidate the default-feature just test-unit nextest runs into one
invocation with per-package filter clauses, so shared dependencies compile
once. Feature-flagged runs and doctests stay separate.
Signed-off-by: Elrond <28d6302a099e5225b02c4155ac4236e4912603df2ab08dbfc2f4fef08ce598c8@buzz.block.builderlab.xyz>
Hermit environment
This is a Hermit bin directory.
The symlinks in this directory are managed by Hermit and will automatically download and install Hermit itself as well as packages. These packages are local to this environment.