fix(cargo): Apply install_env during cargo install by c22 · Pull Request #9502 · jdx/mise

c22 · 2026-05-01T04:04:36Z

The cargo backend did not support the install_env tool option during installation.

install_env is documented in docs/dev-tools/index.md and the documentation suggests it should work with cargo, but it didn't.

This meant users had no consistent way to pass environment variables like RUSTFLAGS to cargo install via mise config.

For example, cargo:xh with features = "http3" requires RUSTFLAGS='--cfg reqwest_unstable' but there was no way to specify that in mise config. Now users can write:

[tools]
"cargo:xh" = { version = "latest", features = "http3", install_env = { RUSTFLAGS = "--cfg reqwest_unstable" } }

The mirrors how the asdf backend already applies install_env.

greptile-apps · 2026-05-01T04:06:15Z

Greptile Summary

This PR adds a single line to propagate the install_env tool option into cargo install invocations, matching how the asdf backend already handles it. The fix is minimal, correct, and the env-var ordering (toolset env first, then install_env) gives install_env the expected higher precedence. install_env is already listed in EPHEMERAL_OPT_KEYS globally, so no changes to install_time_option_keys() or resolve_lockfile_options are needed.

Confidence Score: 5/5

Safe to merge — single-line, well-scoped fix with no correctness issues.

The change is a one-line addition following an established pattern already used in the asdf backend. Env-var precedence is correct, install_env is globally handled as an ephemeral key, and the previously-discussed lockfile-invalidation trade-off was an intentional design decision left to maintainer preference. No P1/P0 issues found.

No files require special attention.

Important Files Changed

Filename	Overview
src/backend/cargo.rs	Adds `.envs(opts.install_env.clone())` after the toolset env setup, correctly applying user-specified install-time environment variables (e.g. `RUSTFLAGS`) to `cargo install`. Mirrors the existing asdf backend pattern and respects proper env-var precedence (install_env overrides inherited toolset env). The change correctly applies to all three install paths (git, binstall, crates.io).

Sequence Diagram

sequenceDiagram
    participant User as mise config
    participant CI as install_version_
    participant Env as CmdLineRunner envs
    participant Cargo as cargo / cargo-binstall

    User->>CI: install_env = { RUSTFLAGS = "..." }
    CI->>Env: .envs(toolset env + PATH)
    CI->>Env: .envs(opts.install_env) [NEW]
    Env->>Cargo: cargo install --features=... (with merged environment)
    Cargo-->>CI: binary installed to install_path

_{Reviews (3): Last reviewed commit: "fix(cargo): Apply install_env during car..." | Re-trigger Greptile}

gemini-code-assist

Code Review

This pull request updates the Cargo backend in src/backend/cargo.rs to include environment variables from the tool version's installation options. A review comment suggests a minor optimization to reuse the existing opts variable instead of re-invoking tv.request.options() to improve code clarity and efficiency.

c22 · 2026-05-01T04:08:51Z

I am not sure if it makes sense to make this more widely available (eg. maybe every backend should support it?).

My immediate use-case was for Rust, but I am interested to hear if this should be something that is available in every InstallContext.

It almost feels like it should be generic but that would increase the scope of this change.

The cargo backend did not support the `install_env` tool option during installation. install_env is documented in docs/dev-tools/index.md and the documentation suggests it should work with cargo, but it didn't. This meant users had no way to pass environment variables like RUSTFLAGS to `cargo install` via mise config. For example, `cargo:xh` with `features = "http3"` requires `RUSTFLAGS='--cfg reqwest_unstable'` but there was no way to specify that in mise config. Now users can write: ```toml [tools] "cargo:xh" = { version = "latest", features = "http3", install_env = { RUSTFLAGS = "--cfg reqwest_unstable" } } ``` The mirrors how the asdf backend already applies install_env.

@jdx

### 🚀 Features - **(conda)** graduate conda backend out of experimental by @jdx in [#9544](#9544) - **(deps)** Add dart and flutter providers by @tjarvstrand in [#9505](#9505) - **(registry)** add neo4j by @mnm364 in [#9525](#9525) - **(registry)** add rustfs by @mnm364 in [#9530](#9530) - **(task)** support exclusion patterns in task sources by @jlarmstrongiv in [#9496](#9496) - **(vfox)** add stat function to lua file module by @esteve in [#9497](#9497) ### 🐛 Bug Fixes - **(backend)** flag regex prerelease versions by @jdx in [#9500](#9500) - **(backend)** mark -nightly/-canary/-experimental as prereleases by @jdx in [#9523](#9523) - **(backend)** suppress no-versions warning for unresolved-latest backends by @jdx in [#9548](#9548) - **(backend)** include dotnet prereleases from package flags by @jdx in [#9551](#9551) - **(backend)** scope PEP 440 prerelease detection to Python backends by @jdx in [#9558](#9558) - **(cargo)** Apply install_env during cargo install by @c22 in [#9502](#9502) - **(copr)** drop epel-9 chroots since rust >= 1.91 is unavailable by @jdx in [#9484](#9484) - **(github)** skip attestations on non-default api_url by @jdx in [#9486](#9486) - **(github)** retry ip allow list errors without auth by @risu729 in [#9506](#9506) - **(http)** update versions host tracking endpoint by @jdx in [#9527](#9527) - **(install)** don't warn for configured tools when version is passed via CLI by @jdx in [#9522](#9522) - **(install)** refresh latest before installing missing tools by @jdx in [#9545](#9545) - **(install)** don't cache nonexistent install paths by @jdx in [#9553](#9553) - **(lockfile)** don't propagate ad-hoc CLI overrides into the project lockfile by @jdx in [#9562](#9562) - **(plugin)** detect plugin types after cloning by @risu729 in [#9540](#9540) - **(release)** pass --no-git-checks to aube publish by @jdx in [#9483](#9483) - **(task)** convert PATH to MSYS Unix form when spawning POSIX shells on Windows by @JamBalaya56562 in [#9547](#9547) ### 📚 Documentation - **(contributing)** require popularity check for registry PRs by @jdx in [7bbeebe](7bbeebe) - **(watch)** update pitchfork domain to en.dev by @risu729 in [#9536](#9536) - document ghtkn GitHub token setup by @jdx in [#9546](#9546) - clarify registry backend acceptance policy by @jdx in [#9543](#9543) - Change exec command to use bash for variable echo by @kuboon in [#9567](#9567) ### 🧪 Testing - **(e2e)** run test-tool targets in parallel by @jdx in [#9564](#9564) - **(e2e)** run tests in parallel by @jdx in [#9563](#9563) - **(e2e)** bind-mount /tmp on disk and surface failed tests in CI summary by @jdx in [#9570](#9570) - **(tasks)** migrate test_task_help atask to usage field by @jdx in [#9549](#9549) ### 📦️ Dependency Updates - update fedora:45 docker digest to 8b838b3 by @renovate[bot] in [#9507](#9507) - update ghcr.io/jdx/mise:deb docker digest to f02194c by @renovate[bot] in [#9509](#9509) - update taiki-e/install-action digest to 7769b73 by @renovate[bot] in [#9512](#9512) - update ghcr.io/jdx/mise:alpine docker digest to 581f8a8 by @renovate[bot] in [#9508](#9508) - update rust crate ctor to v0.10.1 by @renovate[bot] in [#9515](#9515) - update ghcr.io/jdx/mise:rpm docker digest to a5c9655 by @renovate[bot] in [#9510](#9510) - update rust docker digest to a9cfb75 by @renovate[bot] in [#9511](#9511) - update rust crate age to v0.11.3 by @renovate[bot] in [#9514](#9514) - update rust crate jiff to v0.2.24 by @renovate[bot] in [#9516](#9516) - update dependency vitepress-plugin-tabs to ^0.9.0 by @renovate[bot] in [#9518](#9518) - update autofix-ci/action action to v1.3.4 by @renovate[bot] in [#9513](#9513) - update rust crate usage-lib to v3.2.1 by @renovate[bot] in [#9517](#9517) - update apple-actions/import-codesign-certs action to v7 by @renovate[bot] in [#9519](#9519) - update taiki-e/install-action digest to 51cd0b8 by @renovate[bot] in [#9531](#9531) - exclude taiki-e/install-action from renovate by @jdx in [#9532](#9532) - update rust crate blake3 to v1.8.5 by @renovate[bot] in [#9533](#9533) ### 📦 Registry - enable shellcheck on windows by @zeitlinger in [#9487](#9487) - add google-java-format by @zeitlinger in [#9488](#9488) - add expert ([aqua:expert-lsp/expert](https://github.com/expert-lsp/expert)) by @AlternateRT in [#9498](#9498) - update entry for checkmake by @eread in [#9504](#9504) - add systemctl-tui ([aqua:rgwood/systemctl-tui](https://github.com/rgwood/systemctl-tui)) by @2xdevv in [#9521](#9521) - add codon by @3w36zj6 in [#9538](#9538) - add tool yr (backend:github:VirusTotal/yara-x) by @adam-moss in [#9542](#9542) - add tool betterleaks (backend:aqua/betterleaks/betterleaks) by @adam-moss in [#9541](#9541) - add `git-filter-repo` by @garysassano in [#9550](#9550) - add umoci ([aqua:opencontainers/umoci](https://github.com/opencontainers/umoci)) by @2xdevv in [#9555](#9555) - add aqua backend for elixir-ls by @AlternateRT in [#9557](#9557) - deny inline backend options by @risu729 in [#9565](#9565) ### Chore - **(ci)** fail registry tests without summary by @jdx in [#9559](#9559) - **(ci)** use !cancelled() instead of always() for test-ci aggregator by @jdx in [#9569](#9569) - **(ci)** use namespace runners for ci jobs by @jdx in [#9561](#9561) - **(config)** deprecate shorthands_file setting by @risu729 in [#9534](#9534) - **(docs)** remove shrill.en.dev analytics script by @jdx in [#9539](#9539) - **(release)** replace bc with awk in release-plz star formatting by @jdx in [d7f177f](d7f177f) - bump hk to 1.44.3 by @jdx in [#9493](#9493) - invert CLAUDE.md/AGENTS.md so AGENTS.md is canonical by @jdx in [#9560](#9560) - set dev profile debug to 1 by @jdx in [#9572](#9572) ### New Contributors - @kuboon made their first contribution in [#9567](#9567) - @AlternateRT made their first contribution in [#9557](#9557) - @2xdevv made their first contribution in [#9555](#9555) - @adam-moss made their first contribution in [#9541](#9541) - @jlarmstrongiv made their first contribution in [#9496](#9496) - @tjarvstrand made their first contribution in [#9505](#9505)

greptile-apps Bot reviewed May 1, 2026

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Comment thread src/backend/cargo.rs Outdated

gemini-code-assist Bot reviewed May 1, 2026

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Comment thread src/backend/cargo.rs Outdated

c22 force-pushed the main branch from 86edc1d to cd2eb1a Compare May 1, 2026 04:16

c22 force-pushed the main branch from cd2eb1a to b24b05f Compare May 1, 2026 08:17

jdx merged commit 5dbc79a into jdx:main May 1, 2026
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mise-en-dev mentioned this pull request May 1, 2026

chore: release 2026.5.0 #9485

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BrewTestBot mentioned this pull request May 3, 2026

mise 2026.5.0 Homebrew/homebrew-core#280712

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fix(cargo): Apply install_env during cargo install#9502

fix(cargo): Apply install_env during cargo install#9502
jdx merged 1 commit intojdx:mainfrom
c22:main

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Greptile Summary

Confidence Score: 5/5

Important Files Changed

Sequence Diagram

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