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Make propagated mount persist outside rootfs 

This persists the "propagated mount" for plugins outside the main
rootfs. This enables `docker plugin upgrade` to not remove potentially
important data during upgrade rather than forcing plugin authors to hard
code a host path to persist data to.

Also migrates old plugins that have a propagated mount which is in the
rootfs on daemon startup.

Signed-off-by: Brian Goff <cpuguy83@gmail.com>
This commit is contained in:
Brian Goff 2017-02-02 23:08:35 -05:00 committed by Tibor Vass
parent 02677bc06e
commit df4e570ff4
1 changed files with 2 additions and 0 deletions
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docs/extend/config.md
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@ -118,6 +118,8 @@ Config provides the base accessible fields for working with V0 plugin format
- **`propagatedMount`** *string* - **`propagatedMount`** *string*
path to be mounted as rshared, so that mounts under that path are visible to docker. This is useful for volume plugins. path to be mounted as rshared, so that mounts under that path are visible to docker. This is useful for volume plugins.
This path will be bind-mounted outisde of the plugin rootfs so it's contents
are preserved on upgrade.
- **`env`** *PluginEnv array* - **`env`** *PluginEnv array*