pkg/system: move memory-info types to pkg/systeminfo

These types and functions are more closely related to the functionality
provided by pkg/systeminfo, and used in conjunction with the other functions
in that package, so moving them there.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/info.go

@@ -18,7 +18,6 @@ import (
 	"github.com/docker/docker/pkg/parsers/operatingsystem"
 	"github.com/docker/docker/pkg/platform"
 	"github.com/docker/docker/pkg/sysinfo"
-	"github.com/docker/docker/pkg/system"
 	"github.com/docker/docker/registry"
 	metrics "github.com/docker/go-metrics"
 	"github.com/opencontainers/selinux/go-selinux"
@@ -252,11 +251,11 @@ func kernelVersion() string {
 	return kernelVersion
 }
 
-func memInfo() *system.MemInfo {
-	memInfo, err := system.ReadMemInfo()
+func memInfo() *sysinfo.Memory {
+	memInfo, err := sysinfo.ReadMemInfo()
 	if err != nil {
 		logrus.Errorf("Could not read system memory info: %v", err)
-		memInfo = &system.MemInfo{}
+		memInfo = &sysinfo.Memory{}
 	}
 	return memInfo
 }

daemon/stats_collector.go

@@ -5,7 +5,7 @@ import (
 	"time"
 
 	"github.com/docker/docker/daemon/stats"
-	"github.com/docker/docker/pkg/system"
+	"github.com/docker/docker/pkg/sysinfo"
 )
 
 // newStatsCollector returns a new statsCollector that collections
@@ -15,7 +15,7 @@ import (
 func (daemon *Daemon) newStatsCollector(interval time.Duration) *stats.Collector {
 	// FIXME(vdemeester) move this elsewhere
 	if runtime.GOOS == "linux" {
-		meminfo, err := system.ReadMemInfo()
+		meminfo, err := sysinfo.ReadMemInfo()
 		if err == nil && meminfo.MemTotal > 0 {
 			daemon.machineMemory = uint64(meminfo.MemTotal)
 		}

pkg/system/meminfo.go → pkg/sysinfo/meminfo.go

@@ -1,7 +1,7 @@
-package system // import "github.com/docker/docker/pkg/system"
+package sysinfo
 
-// MemInfo contains memory statistics of the host system.
-type MemInfo struct {
+// Memory contains memory statistics of the host system.
+type Memory struct {
 	// Total usable RAM (i.e. physical RAM minus a few reserved bits and the
 	// kernel binary code).
 	MemTotal int64

pkg/system/meminfo_linux.go → pkg/sysinfo/meminfo_linux.go

@@ -1,4 +1,4 @@
-package system // import "github.com/docker/docker/pkg/system"
+package sysinfo
 
 import (
 	"bufio"
@@ -9,8 +9,8 @@ import (
 )
 
 // ReadMemInfo retrieves memory statistics of the host system and returns a
-// MemInfo type.
-func ReadMemInfo() (*MemInfo, error) {
+// Memory type.
+func ReadMemInfo() (*Memory, error) {
 	file, err := os.Open("/proc/meminfo")
 	if err != nil {
 		return nil, err
@@ -20,10 +20,10 @@ func ReadMemInfo() (*MemInfo, error) {
 }
 
 // parseMemInfo parses the /proc/meminfo file into
-// a MemInfo object given an io.Reader to the file.
+// a Memory object given an io.Reader to the file.
 // Throws error if there are problems reading from the file
-func parseMemInfo(reader io.Reader) (*MemInfo, error) {
-	meminfo := &MemInfo{}
+func parseMemInfo(reader io.Reader) (*Memory, error) {
+	meminfo := &Memory{}
 	scanner := bufio.NewScanner(reader)
 	memAvailable := int64(-1)
 	for scanner.Scan() {

pkg/system/meminfo_unix_test.go → pkg/sysinfo/meminfo_unix_test.go

@@ -1,7 +1,7 @@
 //go:build linux || freebsd
 // +build linux freebsd
 
-package system // import "github.com/docker/docker/pkg/system"
+package sysinfo
 
 import (
 	"strings"

pkg/sysinfo/meminfo_unsupported.go

@@ -0,0 +1,11 @@
+//go:build !linux && !windows
+// +build !linux,!windows
+
+package sysinfo
+
+import "errors"
+
+// ReadMemInfo is not supported on platforms other than linux and windows.
+func ReadMemInfo() (*Memory, error) {
+	return nil, errors.New("platform and architecture is not supported")
+}

pkg/system/meminfo_windows.go → pkg/sysinfo/meminfo_windows.go

@@ -1,4 +1,4 @@
-package system // import "github.com/docker/docker/pkg/system"
+package sysinfo
 
 import (
 	"unsafe"
@@ -27,16 +27,16 @@ type memorystatusex struct {
 }
 
 // ReadMemInfo retrieves memory statistics of the host system and returns a
-// MemInfo type.
-func ReadMemInfo() (*MemInfo, error) {
+// Memory type.
+func ReadMemInfo() (*Memory, error) {
 	msi := &memorystatusex{
 		dwLength: 64,
 	}
 	r1, _, _ := procGlobalMemoryStatusEx.Call(uintptr(unsafe.Pointer(msi)))
 	if r1 == 0 {
-		return &MemInfo{}, nil
+		return &Memory{}, nil
 	}
-	return &MemInfo{
+	return &Memory{
 		MemTotal:  int64(msi.ullTotalPhys),
 		MemFree:   int64(msi.ullAvailPhys),
 		SwapTotal: int64(msi.ullTotalPageFile),

pkg/system/meminfo_deprecated.go

@@ -0,0 +1,16 @@
+package system
+
+import "github.com/docker/docker/pkg/sysinfo"
+
+// MemInfo contains memory statistics of the host system.
+//
+// Deprecated: use [sysinfo.Memory].
+type MemInfo = sysinfo.Memory
+
+// ReadMemInfo retrieves memory statistics of the host system and returns a
+// MemInfo type.
+//
+// Deprecated: use [sysinfo.ReadMemInfo].
+func ReadMemInfo() (*sysinfo.Memory, error) {
+	return sysinfo.ReadMemInfo()
+}

pkg/system/meminfo_unsupported.go

@@ -1,9 +0,0 @@
-//go:build !linux && !windows
-// +build !linux,!windows
-
-package system // import "github.com/docker/docker/pkg/system"
-
-// ReadMemInfo is not supported on platforms other than linux and windows.
-func ReadMemInfo() (*MemInfo, error) {
-	return nil, ErrNotSupportedPlatform
-}