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Let graphdrivers declare diff stream fidelity 

This allows graphdrivers to declare that they can reproduce the original
diff stream for a layer. If they do so, the layer store will not use
tar-split processing, but will still verify the digest on layer export.
This makes it easier to experiment with non-default diff formats.

Signed-off-by: Alfred Landrum <alfred.landrum@docker.com>
This commit is contained in:
Alfred Landrum 2017-03-20 11:38:17 -07:00 committed by Tibor Vass
parent 98bcbcf774
commit 4b8712eacb
1 changed files with 23 additions and 0 deletions
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23
docs/extend/plugins_graphdriver.md
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@ -84,6 +84,29 @@ The request also includes a list of UID and GID mappings, structed as follows:
Respond with a non-empty string error if an error occurred.
### /GraphDriver.Capabilities
**Request**:
```json
{}
```
Get behavioral characteristics of the graph driver. If a plugin does not handle
this request, the engine will use default values for all capabilities.
**Response**:
```json
{
"ReproducesExactDiffs": false,
}
```
Respond with values of capabilities:
* **ReproducesExactDiffs** Defaults to false. Flags that this driver is capable
of reproducing exactly equivalent diffs for read-only filesystem layers.
### /GraphDriver.Create
**Request**: