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rust: honor preconfigured Cargo cache for offline builds #5634

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rust: honor preconfigured Cargo cache for offline builds #5634

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rust: honor CARGO_HOME for offline dependent builds
mathomp4 Jul 17, 2026
93e1aa4
Update repos/spack_repo/builtin/packages/rust/package.py
mathomp4 Jul 17, 2026
ca37a60
Update repos/spack_repo/builtin/packages/rust/package.py
mathomp4 Jul 19, 2026
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7 changes: 6 additions & 1 deletion repos/spack_repo/builtin/packages/rust/package.py
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Original file line number Diff line number Diff line change
Expand Up @@ -204,7 +204,12 @@ def get_test_path(p):
def setup_dependent_build_environment(
self, env: EnvironmentModifications, dependent_spec: Spec
) -> None:
env.set("CARGO_HOME", join_path(dependent_spec.package.stage.path, "cargo"))
# Respect an explicitly configured Cargo cache for offline builds.
# Otherwise retain Spack's isolated per-package cache.
cargo_home = os.environ.get("CARGO_HOME")
cargo_offline = os.environ.get("CARGO_NET_OFFLINE", "") == "true"
if not (cargo_home and cargo_offline):
env.set("CARGO_HOME", join_path(dependent_spec.package.stage.path, "cargo"))
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mathomp4 marked this conversation as resolved.

# Until we get a little more integration with cargo or offload solving to spack
# (how to do this is TBD), we need it to fall back to older package versions
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