cargo msrv-table

This cargo subcommand is only a proof of concept (PoC) with no error handling and lots of code duplication. Use at your own risk!

If you're interested in fostering this into a real subcommand, contact me.

A cargo subcommand to generate a table of Minimum Supported Rust Version by crate MAJOR.MINOR version (in SemVer terminology)

For example:

$ cargo msrv-table clap

[...]

clap    MSRV
===     ===
2.33	1.24.1
2.32	1.24.1
2.31	1.24.1
2.30	1.24.1
2.29	1.24.1
2.28	1.24.1
2.27	1.24.1
2.26	1.24.1
2.25	1.24.1
2.24	1.24.1
2.23	1.24.1
2.22	1.24.1
2.21	1.24.1
2.20	1.21.0
2.19	1.12.1
2.18	1.12.1
2.17	1.12.1
2.16	1.12.1
2.15	1.12.1
2.14	1.12.1
2.13	1.12.1
2.12	1.12.1
2.11	1.12.1
2.10	1.12.1
2.9	1.12.1
2.8	1.12.1
2.7	1.12.1
2.6	1.12.1
2.5	1.12.1
2.4	1.12.1
2.3	1.12.1
2.2	1.12.1
2.1	1.6.0
2.0	1.4.0
1.5	1.4.0
1.4	1.2.0
1.3	1.1.0
1.2	1.1.0
1.1	1.0.0
1.0	1.0.0

Pre-requisits

This subcommand requires the following packages be installed on the system or available in $PATH:

• jql
• rustup
• cargo-edit
• cargo
• rustc
• grep
• uniq
• timeout (if --timeout is used)

Warning

This subcommand can take a long time to run. It works by creating a faux project of the target crate, and builds each Rust version from 1.0 until current, and attempts to compile the crate with each version. It does this for every published MAJOR.MINORversion of the crate that has been published to crates.io

Future versions of this subcommand may allow filtering those versions down to fewer numbers by skipping versions, or limiting ranges.

This subcommand also downlods a large ammount of data (all stable Rust version).

Considerations

By default this subcommand will try to build all published MAJOR.MINOR.MAX_PATCH versions of a crate against each stable Rust compiler (1.MINOR.MAX_PATCH).

PreReleases

It skips pre-release (<=0.y.z) unless --no-skip-prereleases is used.

Pre-Download Rust Versions

On first run, one of the longest wait items is downloading all the Rust versions to check. You can pre-download the Rust versions using rustup

$ for VER in {0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0,11.0,12.1,13.0,14.0,15.1,16.0,17.0,18.0,19.0,20.0,21.0,22.1,23.0,24.1,25.0,26.2,27.2,28.0,29.2,30.1,31.0,32.0,33.0,34.2,35.0,36.0,37.0,38.0,39.0,40.0,41.1}; do rustup install 1.$VER; done

Cleanup

Likewise, you may wish to delete all those Rust versions:

$ for VER in {0.0,1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0,11.0,12.1,13.0,14.0,15.1,16.0,17.0,18.0,19.0,20.0,21.0,22.1,23.0,24.1,25.0,26.2,27.2,28.0,29.2,30.1,31.0,32.0,33.0,34.2,35.0,36.0,37.0,38.0,39.0,40.0,41.1}; do rustup uninstall 1.$VER; done

Eager Ending

By default Rust versions are traversed in ascending order, and will end traversal once a successful build is found. However, if you choose to use --rust-order=descending you may also want to disable this eagerness to avoid a false positive. This can be disabled by using --no-eager-end which will continue to build against earlier Rust versions even after a failed build.

Timeouts

A timeout can be supplied for the cargo build command which will consider a build failed after N seconds. This is useful for early builds that may hang.

cargo features

There is no consideration for cargo features

Target Platform

There is no consideration for target platform

License

This project is released under the terms of either the MIT or Apache 2.0 license at your option.