cli/command: deprecate DockerCli.ContentTrustEnabled

This function was used internally, but is no longer used. Users should check
the value of the `DOCKER_CONTENT_TRUST` environment variable instead.

There are no known external users of this method, so already removing it
from the Cli interface; this method will be removed in the next release.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 11d40488dd)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/cli.go

@@ -50,7 +50,6 @@ type Cli interface {
 	ServerInfo() ServerInfo
 	DefaultVersion() string
 	CurrentVersion() string
-	ContentTrustEnabled() bool
 	BuildKitEnabled() (bool, error)
 	ContextStore() store.Store
 	CurrentContext() string
@@ -160,6 +159,8 @@ func (cli *DockerCli) ServerInfo() ServerInfo {
 
 // ContentTrustEnabled returns whether content trust has been enabled by an
 // environment variable.
+//
+// Deprecated: check the value of the DOCKER_CONTENT_TRUST environment variable to detect whether content-trust is enabled.
 func (cli *DockerCli) ContentTrustEnabled() bool {
 	return cli.contentTrust
 }