The mock plug-in is a stand-alone binary that implements the CSI Controller, Identity, and Node RPCs in addition to the specification's requirements regarding idempotency.
The mock plug-in always starts with a deterministic state and maintains
state for the duration of the process. The state can also be modified.
For example, while the plug-in launches with three volumes, a
CreateVolume RPC will update the plug-in's internal data map so that a
subsequent ListVolumes RPC will indicate four volumes are present.
Per the specification the Mock plug-in starts a gRPC server using the
value of the environment variable CSI_ENDPOINT. The plug-in process
runs in the foreground, logging activity to STDOUT and errors to
STDERR, only returning control to the user when CTRL-C is entered
or the process is sent a kill signal.
$ CSI_ENDPOINT=/tmp/csi.sock mock/mock
INFO 2017/08/22 16:22:15 main.go:154: mock.Serve: /tmp/csi.sock
INFO 2017/08/22 16:22:18 main.go:133: /csi.Controller/CreateVolume: REQ 0001: Version=minor:1 , Name=Test Volume, CapacityRange=required_bytes:10740000000 limit_bytes:107400000000 , VolumeCapabilities=[mount:<fs_type:"ext4" mount_flags:"-o noexec" > ], Parameters=map[tag:gold]
INFO 2017/08/22 16:22:18 main.go:133: /csi.Controller/CreateVolume: REP 0001: Reply=&{volume_info:<capacity_bytes:107400000000 id:<values:<key:"id" value:"4" > values:<key:"name" value:"Test Volume" > > metadata:<> > }
INFO 2017/08/22 16:23:53 main.go:94: received signal: interrupt: shutting down
INFO 2017/08/22 16:23:53 main.go:188: mock.GracefulStop
INFO 2017/08/22 16:23:53 main.go:53: removed sock file: /tmp/csi.sock
INFO 2017/08/22 16:23:53 main.go:64: server stopped gracefully