refactor init and setns process

Introduce a common parent struct `containerProcess`,
let both `initProcess` and `setnsProcess` are inherited
from it.

Signed-off-by: lfbzhm <[email protected]>

Author: lifubang

libcontainer/container_linux.go

@@ -653,14 +653,16 @@ func (c *Container) newInitProcess(p *Process, cmd *exec.Cmd, comm *processComm)
 	}
 
 	init := &initProcess{
-		cmd:             cmd,
-		comm:            comm,
-		manager:         c.cgroupManager,
+		containerProcess: containerProcess{
+			cmd:           cmd,
+			comm:          comm,
+			manager:       c.cgroupManager,
+			config:        c.newInitConfig(p),
+			process:       p,
+			bootstrapData: data,
+			container:     c,
+		},
 		intelRdtManager: c.intelRdtManager,
-		config:          c.newInitConfig(p),
-		container:       c,
-		process:         p,
-		bootstrapData:   data,
 	}
 	c.initProcess = init
 	return init, nil
@@ -679,15 +681,18 @@ func (c *Container) newSetnsProcess(p *Process, cmd *exec.Cmd, comm *processComm
 		return nil, err
 	}
 	proc := &setnsProcess{
-		cmd:             cmd,
+		containerProcess: containerProcess{
+			cmd:           cmd,
+			comm:          comm,
+			manager:       c.cgroupManager,
+			config:        c.newInitConfig(p),
+			process:       p,
+			bootstrapData: data,
+			container:     c,
+		},
 		cgroupPaths:     state.CgroupPaths,
 		rootlessCgroups: c.config.RootlessCgroups,
 		intelRdtPath:    state.IntelRdtPath,
-		comm:            comm,
-		manager:         c.cgroupManager,
-		config:          c.newInitConfig(p),
-		process:         p,
-		bootstrapData:   data,
 		initProcessPid:  state.InitProcessPid,
 	}
 	if len(p.SubCgroupPaths) > 0 {

libcontainer/process_linux.go

@@ -99,17 +99,22 @@ func (c *processComm) closeParent() {
 	// c.logPipeParent is kept alive for ForwardLogs
 }
 
+type containerProcess struct {
+	cmd           *exec.Cmd
+	comm          *processComm
+	config        *initConfig
+	manager       cgroups.Manager
+	fds           []string
+	process       *Process
+	bootstrapData io.Reader
+	container     *Container
+}
+
 type setnsProcess struct {
-	cmd             *exec.Cmd
-	comm            *processComm
+	containerProcess
 	cgroupPaths     map[string]string
 	rootlessCgroups bool
-	manager         cgroups.Manager
 	intelRdtPath    string
-	config          *initConfig
-	fds             []string
-	process         *Process
-	bootstrapData   io.Reader
 	initProcessPid  int
 }
 
@@ -430,15 +435,8 @@ func (p *setnsProcess) forwardChildLogs() chan error {
 }
 
 type initProcess struct {
-	cmd             *exec.Cmd
-	comm            *processComm
-	config          *initConfig
-	manager         cgroups.Manager
+	containerProcess
 	intelRdtManager *intelrdt.Manager
-	container       *Container
-	fds             []string
-	process         *Process
-	bootstrapData   io.Reader
 }
 
 func (p *initProcess) pid() int {