Package management and versioning guide

This page presents the details around packaging management and versioning for Parsec-related repositories. Currently our repos are mainly Rust crates, so this guide is accordingly geared towards them - when other guidelines become relevant, e.g. specific to Go libraries, new sections should be added below.

The following points are relevant to all software we publish to package management repositories:

  • For published versions of a project a tag carrying the version number should be upstreamed to GitHub, e.g. if version 2.3.1 was published, a tag named "2.3.1" must be added to the commit in GitHub.
  • If multiple projects that end up in a package manager reside in the same repo, the tags should reflect both the project and the version number, e.g. if version 2.3.1 of project X was published, a tag named "X-2.3.1" or similar must be used.
  • Projects should follow Semantic Versioning rules.
  • Following the release of a new version of publicly-facing projects, update the file. For some projects it's also advised to create a GitHub Release from the tag mentioned above.

Rust crates

The process around publishing Rust crates is tightly linked with In order to publish or have control over crates, you must own an account on the website. Before you decide whether you want to publish a crate, check out the Dependency management section below.

  • Follow the instructions here to create your account and to set your workspace up.
  • If you'd like to publish a new version of an existing crate using the ownership granted to the Parallaxsecond Admin group, you need to enable to access that organisation. You can do so from the applications page in your account settings - in the application settings you must request permission for the parallaxsecond org to be linked. One of the org owners must approve that request.
  • Alternatively, if you'd like to publish a new version but are not part of the Admin group, you can request to become an owner of the crate from one of the admins.

Once you are able to publish crates you can start doing so, but being aware of the following facts is helpful.

  • If the crate you are publishing is new or has major changes in its build steps, its documentation might not be built properly by This is because has its own build system where crates are built in complete isolation from the internet and with a set of dependencies that might not cover the ones you require. Check out their documentation here.
  • Once you have settled on a crate to upstream, make sure you are on the most recent version of the main branch (e.g. master) - you should have no uncommited changes lingering.
  • Run a cargo publish --dry-run - this ensures that the publishing process is possible with the current state of the repo.
  • Change the version number of the crate in Cargo.toml following semantic versioning rules.
  • If any other (small) changes must be made, such as updating a dependency, you can also add them in this commit. No specific limit is given to "small", but if the dependency update includes changes to an API or to how some internal components work, then a separate pull request is needed.
  • Commit the previous changes and either upstream them directly to the main branch or create a pull request.
  • Once the version change is on the main branch, run another dry-run publishing, followed by the real operation. Once that is complete, tag the latest commit and upstream the tag.
  • Repeat these steps for every crate along the way in the dependency tree.

Dependency management

Producing a release of the Parsec service requires some understanding of the way in which all the components, and especially the various crates found under the Parallaxsecond organization, relate to each other. You can find some details of the code structure here. A detailed list of direct dependencies to Parallaxsecond crates that can be found on is given below.

parsec-service dependencies:

  • parsec-interface: used for managing IPC communication
  • psa-crypto: used in the Mbed Crypto provider as the interface to a PSA Crypto implementation
  • tss-esapi: used in the TPM provider as the interface to the TSS stack
  • parsec-client: NOT used in the service, but as a dependency for the test client

parsec-interface dependencies:

  • psa-crypto: used to represent the Rust-native PSA Crypto data types

parsec-client dependencies:

  • parsec-interface: used for managing IPC communication

parsec-tool dependencies:

  • parsec-client: used to handle all communication with the service

Publishing new versions of dependencies is not always required. If you're not planning to immediately publish some crate, then you don't need to publish any of its dependencies, you can simply import updates, using the git syntax, as transient dependencies in Cargo.toml. By doing so, however, you're removing the option of publishing to until all those git dependencies are removed. Because of this issue we suggest adding transient dependencies to crates not residing under the Parallaxsecond organization only when a published version of the third party crate is due soon. This is to limit the likelihood of an urgent release of Parsec being stalled behind a third-party release cycle. If you're unsure about or would want to discuss such an approach, we welcome discussions and proposals in our community channels!

Copyright 2021 Contributors to the Parsec project.