#systemd #uuid #sd-id128 #id128


A wrapper for sd-id128 implemented in libsystemd

5 releases (2 stable)

1.0.1 Feb 13, 2021
1.0.0 Feb 11, 2021
0.1.2 Feb 8, 2021
0.1.1 Jan 1, 2021
0.1.0 Jan 1, 2021

#51 in Unix APIs

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Used in sd-journal


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GitHub release (latest by date) Crates.io docs.rs GitHub Workflow Status buy me a coffee donate@paypal

sd-id128 is a rust wrapper for sd-id128 in the systemd API of libsystemd. sd-id128 is part of the systemd.rs project.



This library is developed against the latest version of systemd. Unfortunately not all systems are up to date in that regard. Compatibility can be mastered using features. Each feature is named after the corresponding systemd version. The following features exist currently:

  • 240: Jan 12, 2019
  • 233: Mar 12, 2017

All features are in the default feature set. If required, default-features must be turned off. Features are stacking: if you select feature 240, you will get 233 included.


default, all features included for newest version of libsystemd:

sd-id128 = "1.0"

support for version 240+ / with features 233 and 240:

sd-id128 = {default-features=false, version="1.0", features=["240"]}

support for versions older than 233:

sd-id128 = {default-features=false, version="1.0"}


use sd_id128::{Case, Format, ID128};
let id128 = ID128::boot_id().unwrap();
println!("The boot id in RFC format is: {}", id128);
println!("The boot id in libsystemd format is: {}",
         id128.to_string_formatted(Format::LibSystemD, Case::Lower));

Version History

As of version 1.0 this library uses the semantic versioning.

  • 01.01.2021 v0.1.0
    • initial version
  • 01.01.2021 v0.1.1
    • documentation errors fixed
  • 08.02.2021 v0.1.2
    • project repository moved gitlab --> github
    • minor documentation improvements
  • 11.02.2021 v1.0.0
    • introduce features
    • extend documentation
  • 13.02.2021 v1.0.1
    • dependency to sd-sys raised to 1.0.0


  • Implement Serde as feature
  • Check Trait completeness
    • [ ] Ord
    • [ ] PartialOrd
    • Hash
  • check conversion completeness
    • AsRef
    • AsMut
  • improve documentation with examples
  • extend tests
  • [ ] setup bench tests


sd-id128 is published under the AGPL-3.0, individual licenses may be granted upon request.

sd-id128: a wrapper for sd-id128 of libsystemd
Copyright (C) 2020 Christian Klaue [mail@ck76.de]

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.