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README: add libpathrs installation notes

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libpathrs now has its own installation instructions[1] but it is quite
helpful to provide some high-level instructions as well as notes about
what minimum versions we expect.

[1]: https://github.com/cyphar/libpathrs/blob/main/INSTALL.md

Suggested-by: Li Fubang <lifubang@acmcoder.com>
Signed-off-by: Aleksa Sarai <aleksa@amutable.com>
This commit is contained in:
Aleksa Sarai
2026-03-24 21:14:34 +11:00
parent 142c838e53
commit 81d59df8d5
1 changed files with 50 additions and 1 deletions
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@@ -54,7 +54,56 @@ apk --update add bash make gcc libseccomp-dev musl-dev linux-headers git
The following dependencies are optional:
* `libseccomp` - only required if you enable seccomp support; to disable, see [Build Tags](#build-tags)
* `libseccomp` - only required if you enable seccomp support; to disable, see [Build Tags](#build-tags).
* `libpathrs` - only required if you enable libpathrs support; to disable, see [Build Tags](#build-tags).
For notes on installing libpathrs, see [the next section](#libpathrs).
##### libpathrs
[libpathrs][] is a Rust library runc can optionally use for path safety. As
mentioned in [the build tag section](#build-tags), its use is controlled with
the `libpathrs` build tag. runc currently requires at least libpathrs 0.2.4 in
order to function properly.
At time of writing, very few distributions have libpathrs packages and so it is
usually necessary to build and install it locally. For detailed installation
instructions, see [the upstream documentation][libpathrs-install-md], but for
development builds the following instructions should be sufficient:
libpathrs requires Rust 1.63+ (which is available on almost any distribution,
including Debian oldstable and enterprise distributions like RHEL or SLES).
Assuming you already have `cargo` installed (as well as other libpathrs
dependencies like `clang` and `lld`), the following steps are all that are
really necessary to install libpathrs:
```sh
LIBPATHRS_VERSION=0.2.4
curl -o - -sSL https://github.com/cyphar/libpathrs/releases/download/v${LIBPATHRS_VERSION}/libpathrs-${LIBPATHRS_VERSION}.tar.xz | tar xvfJ -
cd libpathrs-${LIBPATHRS_VERSION}/
make release
sudo ./install.sh --prefix=/usr/local
sudo ldconfig
```
As part of our CI, we make use of a custom [installation script for
libpathrs][libpathrs-install-script] which may be useful as a reference for
folks with more complicated needs. With `script/build-libpathrs.sh` the
installation of libpathrs becomes as simple as:
```sh
sudo ./script/build-libpathrs.sh "$LIBPATHRS_VERSION" /usr/local
sudo ldconfig
```
However, please note that this installation script is **completely
unsupported** and is not really intended for general use (it includes some
workarounds for issues in our CI which will no longer be necessary once
libpathrs has distribution packages we can use).
[libpathrs]: https://github.com/cyphar/libpathrs
[libpathrs-install-md]: https://github.com/cyphar/libpathrs/blob/main/INSTALL.md
[libpathrs-install-script]: ./script/build-libpathrs.sh
[gha-test-yml]: ./.github/workflows/test.yml
### Build