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| author | Luca Boccassi <luca.boccassi@microsoft.com> | 2020-05-22 16:05:12 +0100 |
|---|---|---|
| committer | Luca Boccassi <luca.boccassi@microsoft.com> | 2020-06-23 12:57:05 +0100 |
| commit | 34e0d56ce23fcdfd264ad5e8ada58a520c23a80f (patch) | |
| tree | 0254a326366ae75d36e23669dfd878ce12535d9c | |
| parent | b3b1a08a5661df87986a504722db291fa3ccc9f5 (diff) | |
| download | systemd-34e0d56ce23fcdfd264ad5e8ada58a520c23a80f.tar.gz | |
Container interface: document exposing the host's os-release
In order to allow applications to detect the host OS version or other
metadata, ask container managers to expose the os-release files as
read-only bind mounts.
For systemd-nspawn, we will also expose ID, BUILD_ID, VERSION_ID and
VARIANT_ID as lowercase environment variables prefixed by the
container_host_ string.
| -rw-r--r-- | docs/CONTAINER_INTERFACE.md | 10 | ||||
| -rw-r--r-- | man/os-release.xml | 7 |
2 files changed, 17 insertions, 0 deletions
diff --git a/docs/CONTAINER_INTERFACE.md b/docs/CONTAINER_INTERFACE.md index 71f9185c58..a36d2edc72 100644 --- a/docs/CONTAINER_INTERFACE.md +++ b/docs/CONTAINER_INTERFACE.md @@ -121,6 +121,16 @@ manager, please consider supporting the following interfaces. `container_ttys=pts/7 pts/8 pts/14` it will spawn three additional login gettys on ptys 7, 8, and 14. +4. To allow applications to detect the OS version and other metadata of the host + running the container manager, if this is considered desirable, please parse + the host's `/etc/os-release` and set a `$container_host_<key>=<VALUE>` + environment variable for the ID fields described by the [os-release + interface](https://www.freedesktop.org/software/systemd/man/os-release.html), eg: + `$container_host_id=debian` + `$container_host_build_id=2020-06-15` + `$container_host_variant_id=server` + `$container_host_version_id=10` + ## Advanced Integration 1. Consider syncing `/etc/localtime` from the host file system into the diff --git a/man/os-release.xml b/man/os-release.xml index a2e3d0d8ac..675daf3ede 100644 --- a/man/os-release.xml +++ b/man/os-release.xml @@ -339,6 +339,13 @@ name in order to avoid name clashes. Applications reading this file must ignore unknown fields. Example: <literal>DEBIAN_BTS="debbugs://bugs.debian.org/"</literal></para> + + <para>Container and sandbox runtime managers may make the host's + identification data available to applications by providing the host's + <filename>/etc/os-release</filename> and + <filename>/usr/lib/os-release</filename> as respectively + <filename>/run/host/etc/os-release</filename> and + <filename>/run/host/usr/lib/os-release</filename>.</para> </refsect1> <refsect1> |