Systemd Adds Optional Rust Support for New Components
The systemd project now permits Rust code in new utilities, provided they maintain C linkage and bypass the Cargo toolchain.
Updated on Oct. 24, 2026 in Software
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Systemd developers have merged support for the Rust programming language into the systemd codebase as an alternative to C. This optional integration, slated for inclusion in systemd 263, allows for Rust-based components to be built using Meson with mandatory C linkage.
Why it matters
The inclusion of Rust offers a memory-safe alternative for new systemd components without necessitating the massive refactoring of existing legacy C code. By mandating C linkage and excluding Cargo, developers aim to maintain the project's strict build requirements while expanding the language options for future utilities.
A test program implementation shows a 32KB binary size when written in Rust compared to 20KB for its C twin. The implementation uses a -Drust= Meson build option, set to auto by default, and requires all Rust code to maintain C linkage without the use of the Cargo package manager.
The players
systemd
The fundamental software suite that provides core components for Linux operating systems, including service management and boot processing.
The details
Rust support functions as an alternative for new programs and leaf components within the systemd architecture. Developers are utilizing Meson, a build automation tool, to manage the integration rather than standard Rust tooling like Cargo. To ensure compatibility with the existing codebase, all Rust components must use C linkage, confirming that developers do not intend to port existing C-based systemd code to the new language.
Timeline
Rust support was merged into the systemd Git repository on 2026-10-24.
The Tech Race
The adoption of Rust in systemd follows the precedent set by the Linux kernel, signaling a broader migration toward memory-safe languages in critical low-level infrastructure. This move places systemd in alignment with modern systems engineering efforts to mitigate memory vulnerabilities without sacrificing performance or control.
Users will see Rust-based components arrive in systemd 263, with the systemd-keyring-setup utility expected to be the first to adopt the language. Because the feature is optional and defaults to auto, system administrators and distribution maintainers can toggle support via Meson build configurations.
The takeaway
Developers are prioritizing incremental adoption over large-scale refactoring by keeping Rust as an optional alternative for new components. Watch for the systemd 263 release to confirm the stability of the first Rust-implemented utilities in production environments.
Further reading
For more developments on foundational Linux infrastructure, visit our section on Software.
More information
Review the full systemd Rust support pull request on GitHub.
Source note: This article includes information reported by Phoronix.
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Do you believe replacing C with memory-safe languages like Rust improves long-term software reliability?
