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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*
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*