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Container interface: document exposing the host's os-release

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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.
This commit is contained in:
Luca Boccassi 2020-05-22 16:05:12 +01:00
parent b3b1a08a56
commit 34e0d56ce2
2 changed files with 17 additions and 0 deletions
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10
docs/CONTAINER_INTERFACE.md
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@ -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

7
man/os-release.xml
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@ -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>