pkg/mgrconfig: move Subsystem from pkg/cover

mgrconfig used to be "leaf" package that can be imported by anything.
Recently it started importing pkg/cover for Subsystem definition.
It leads to the following import cycle if I try to import
pkg/host from pkg/cover:

package github.com/google/syzkaller/pkg/bisect
	imports github.com/google/syzkaller/pkg/build
	imports github.com/google/syzkaller/pkg/mgrconfig
	imports github.com/google/syzkaller/pkg/cover
	imports github.com/google/syzkaller/pkg/host
	imports github.com/google/syzkaller/pkg/csource
	imports github.com/google/syzkaller/pkg/mgrconfig:
import cycle not allowed

Move Subsystem into pkg/mgrconfig itself.

5 files changed, 15 insertions, 14 deletions

diff --git a/pkg/cover/cover.go b/pkg/cover/cover.go
index 572d5e5da..814ae4fb6 100644
--- a/pkg/cover/cover.go
+++ b/pkg/cover/cover.go
@@ -6,11 +6,6 @@ package cover
 
 type Cover map[uint32]struct{}
 
-type Subsystem struct {
-	Name  string   `json:"name"`
-	Paths []string `json:"path"`
-}
-
 func (cov *Cover) Merge(raw []uint32) {
 	c := *cov
 	if c == nil {
diff --git a/pkg/cover/html.go b/pkg/cover/html.go
index 1757964b5..b21b7a95a 100644
--- a/pkg/cover/html.go
+++ b/pkg/cover/html.go
@@ -18,6 +18,7 @@ import (
 	"strings"
 
 	"github.com/google/syzkaller/pkg/cover/backend"
+	"github.com/google/syzkaller/pkg/mgrconfig"
 )
 
 func (rg *ReportGenerator) DoHTML(w io.Writer, progs []Prog) error {
@@ -199,7 +200,7 @@ func (rg *ReportGenerator) DoCSVFiles(w io.Writer, progs []Prog) error {
 	return writer.WriteAll(d)
 }
 
-func groupCoverByFilePrefixes(datas []fileStats, subsystems []Subsystem) map[string]map[string]string {
+func groupCoverByFilePrefixes(datas []fileStats, subsystems []mgrconfig.Subsystem) map[string]map[string]string {
 	d := make(map[string]map[string]string)
 
 	for _, subsystem := range subsystems {
diff --git a/pkg/cover/report.go b/pkg/cover/report.go
index 94540b6c8..b838d5f5f 100644
--- a/pkg/cover/report.go
+++ b/pkg/cover/report.go
@@ -8,6 +8,7 @@ import (
 	"sort"
 
 	"github.com/google/syzkaller/pkg/cover/backend"
+	"github.com/google/syzkaller/pkg/mgrconfig"
 	"github.com/google/syzkaller/sys/targets"
 )
 
@@ -16,7 +17,7 @@ type ReportGenerator struct {
 	srcDir    string
 	objDir    string
 	buildDir  string
-	subsystem []Subsystem
+	subsystem []mgrconfig.Subsystem
 	*backend.Impl
 }
 
@@ -27,13 +28,13 @@ type Prog struct {
 
 var RestorePC = backend.RestorePC
 
-func MakeReportGenerator(target *targets.Target, vm, objDir, srcDir, buildDir string,
-	subsystem []Subsystem, moduleObj []string, modules map[string]backend.KernelModule) (*ReportGenerator, error) {
+func MakeReportGenerator(target *targets.Target, vm, objDir, srcDir, buildDir string, subsystem []mgrconfig.Subsystem,
+	moduleObj []string, modules map[string]backend.KernelModule) (*ReportGenerator, error) {
 	impl, err := backend.Make(target, vm, objDir, srcDir, buildDir, moduleObj, modules)
 	if err != nil {
 		return nil, err
 	}
-	subsystem = append(subsystem, Subsystem{
+	subsystem = append(subsystem, mgrconfig.Subsystem{
 		Name:  "all",
 		Paths: []string{""},
 	})
diff --git a/pkg/cover/report_test.go b/pkg/cover/report_test.go
index 4b0dabc8e..239ca106f 100644
--- a/pkg/cover/report_test.go
+++ b/pkg/cover/report_test.go
@@ -22,6 +22,7 @@ import (
 	"time"
 
 	"github.com/google/syzkaller/pkg/cover/backend"
+	"github.com/google/syzkaller/pkg/mgrconfig"
 	"github.com/google/syzkaller/pkg/osutil"
 	"github.com/google/syzkaller/pkg/symbolizer"
 	_ "github.com/google/syzkaller/sys"
@@ -180,7 +181,7 @@ func generateReport(t *testing.T, target *targets.Target, test Test) ([]byte, []
 	}
 	defer os.RemoveAll(dir)
 	bin := buildTestBinary(t, target, test, dir)
-	subsystem := []Subsystem{
+	subsystem := []mgrconfig.Subsystem{
 		{
 			Name: "sound",
 			Paths: []string{
diff --git a/pkg/mgrconfig/config.go b/pkg/mgrconfig/config.go
index 5400ad952..14cbd6599 100644
--- a/pkg/mgrconfig/config.go
+++ b/pkg/mgrconfig/config.go
@@ -5,8 +5,6 @@ package mgrconfig
 
 import (
 	"encoding/json"
-
-	"github.com/google/syzkaller/pkg/cover"
 )
 
 type Config struct {
@@ -55,7 +53,7 @@ type Config struct {
 	//		{ "name": "sound", "path": ["sound", "techpack/audio"]},
 	//		{ "name": "mydriver": "path": ["mydriver_path"]}
 	//	]
-	KernelSubsystem []cover.Subsystem `json:"kernel_subsystem,omitempty"`
+	KernelSubsystem []Subsystem `json:"kernel_subsystem,omitempty"`
 	// Arbitrary optional tag that is saved along with crash reports (e.g. branch/commit).
 	Tag string `json:"tag,omitempty"`
 	// Location of the disk image file.
@@ -160,6 +158,11 @@ type Config struct {
 	Derived `json:"-"`
 }
 
+type Subsystem struct {
+	Name  string   `json:"name"`
+	Paths []string `json:"path"`
+}
+
 type covFilterCfg struct {
 	Files     []string `json:"files"`
 	Functions []string `json:"functions"`