Pass upstream client's user agent through to registry on image pulls

Changes how the Engine interacts with Registry servers on image pull.
Previously, Engine sent a User-Agent string to the Registry server
that included only the Engine's version information.  This commit
appends to that string the fields from the User-Agent sent by the
client (e.g., Compose) of the Engine.  This allows Registry server
operators to understand what tools are actually generating pulls on
their registries.

Signed-off-by: Mike Goelzer <mgoelzer@docker.com>
Upstream-commit: d1502afb63a10df0bfce20ae2957774cfb3e58d8
Component: engine
This commit is contained in:
Mike Goelzer
2016-03-08 18:18:53 -08:00
parent 59253b391c
commit 6143e6c8cf
11 changed files with 163 additions and 16 deletions

View File

@ -16,6 +16,9 @@ import (
// APIVersionKey is the client's requested API version.
const APIVersionKey = "api-version"
// UAStringKey is used as key type for user-agent string in net/context struct
const UAStringKey = "upstream-user-agent"
// APIFunc is an adapter to allow the use of ordinary functions as Docker API endpoints.
// Any function that has the appropriate signature can be registered as a API endpoint (e.g. getVersion).
type APIFunc func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error