This could be used in LinuxKit now, as there are some examples, eg
https://github.com/linuxkit/linuxkit/blob/master/blueprints/docker-for-mac/base.yml#L33
which are creating containers to do a mount.
The main reason though is to in future change the ad hoc code that generates
overlay mounts for writeable containers with a runtime config which does
the same thing; this code needs to create both tmpfs and overlay mounts.
See https://github.com/moby/tool/pull/145
Signed-off-by: Justin Cormack <justin.cormack@docker.com>
This adds support for a runtime configuration file that can do:
- `mkdir` to make a directory at runtime, eg in `/var` or `/tmp`, to avoid workarounds
- `interface` that can create network interfaces in a container or move them
- `bindNS` that can bind mount namespaces of an `onboot` container to a file so a service can be started in that namespace.
It merges the `service` and `onboot` tools (in `init`) to avoid duplication. This also saves some size for
eg LCOW which did not use the `onboot` code in `runc`.
Signed-off-by: Justin Cormack <justin.cormack@docker.com>