initial commit of v3 migration.

tools/v3migration/v3Changes.md

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+# v2 to v3 changes
+
+
+- create v3 directory
+- Remove process.NetIOCounters (#429)
+- rename memoryLimitInBbytes JSON key in docker (#464)
+- fix cgroup filename (#464)
+- RLimit is now uint64 (#364)
+
+### not yet
+
+- mem.VirtualMemoryStat JSON fields capitalization and TestX_String tests (#545)
+- Determine if process is running in the foreground (#596)

tools/v3migration/v3migration.go

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+package main
+
+import (
+	"flag"
+	"fmt"
+	"go/ast"
+	"go/format"
+	"go/parser"
+	"go/token"
+	"log"
+	"os"
+
+	"golang.org/x/tools/go/ast/astutil"
+)
+
+// https://github.com/shirou/gopsutil/issues/429
+func issue429() error {
+	f := func(filename string) error {
+		fset := token.NewFileSet()
+		expr, err := parser.ParseFile(fset, filename, nil, parser.ParseComments)
+		if err != nil {
+			return err
+		}
+		n := astutil.Apply(expr, func(cr *astutil.Cursor) bool {
+			if cr.Name() == "Decls" {
+				switch n := cr.Node().(type) {
+				case *ast.FuncDecl:
+					if n.Name.Name == "NetIOCounters" || n.Name.Name == ("NetIOCountersWithContext") {
+						cr.Delete()
+					}
+				}
+			}
+			return true
+		}, nil)
+		return replace(filename, fset, n)
+	}
+
+	root := "process/process_"
+	fnames := []string{"darwin.go", "fallback.go", "freebsd.go", "linux.go", "openbsd.go", "posix.go", "windows.go", "test.go"}
+	for _, fname := range fnames {
+		if err := f(root + fname); err != nil {
+			log.Fatalln("run 429:", err)
+		}
+	}
+	return nil
+}
+
+func replace(filename string, fset *token.FileSet, n ast.Node) error {
+	if err := os.Remove(filename); err != nil {
+		return err
+	}
+	fp, err := os.Create(filename)
+	if err != nil {
+		return err
+	}
+	defer fp.Close()
+	if err := format.Node(fp, fset, n); err != nil {
+		return err
+	}
+	fp.WriteString("\n")
+	return nil
+}
+
+func main() {
+	flag.Parse()
+	for _, n := range flag.Args() {
+		fmt.Println("issue:" + n)
+		switch n {
+		case "429":
+			issue429()
+		}
+	}
+
+}

tools/v3migration/v3migration.sh

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+#!/usr/bin/env bash
+
+set -eu
+
+# this scripts is used when migrating v2 to v3.
+# usage: cd ${GOPATH}/src/github.com/shirou/gopsutil && bash tools/v3migration/v3migration.sh
+
+
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+ROOT=$(cd ${DIR}/../.. && pwd)
+
+
+## 1. refresh
+cd ${ROOT}
+
+/bin/rm -rf v3
+
+## 2. copy directories
+# docker is removed, #464 will be fixed
+mkdir -p v3
+cp -rp cpu disk docker host internal load mem net process winservices v3
+
+# build migartion tool
+go build -o v3/v3migration ${DIR}/v3migration.go
+
+
+V3DIR=$(cd ${ROOT}/v3 && pwd)
+cd ${V3DIR}
+
+## 3. mod
+go mod init
+
+###  change import path
+find . -name "*.go" | xargs -I@ sed -i 's|"github.com/shirou/gopsutil/|"github.com/shirou/gopsutil/v3/|g' @
+
+############ Issues
+
+# #429 process.NetIOCounters is pointless on Linux
+./v3migration `pwd` 429
+
+
+# #464 CgroupMem : fix typo and wrong file names
+sed -i 's|memoryLimitInBbytes|memoryLimitInBytes|g' docker/docker.go
+sed -i 's|memoryLimitInBbytes|memory.limit_in_bytes|g' docker/docker_linux.go
+sed -i 's|memoryFailcnt|"memory.failcnt|g' docker/docker_linux.go
+
+
+# fix #346
+sed -i 's/Soft     int32/Soft     uint64/' process/process.go
+sed -i 's/Hard     int32/Hard     uint64/' process/process.go
+sed -i 's| //TODO too small. needs to be uint64||' process/process.go
+sed -i 's|limitToInt(val string) (int32, error)|limitToUint(val string) (uint64, error)|' process/process_*.go
+sed -i 's|limitToInt|limitToUint|' process/process_*.go
+sed -i 's|return int32(res), nil|return uint64(res), nil|' process/process_*.go
+sed -i 's|math.MaxInt32|math.MaxUint64|' process/process_*.go
+
+
+
+############ SHOULD BE FIXED BY HAND
+
+
+