/
semver.go
299 lines (275 loc) · 6.38 KB
/
semver.go
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package main
import (
"bytes"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"os"
"os/exec"
"regexp"
"runtime"
"strconv"
"strings"
"syscall"
"text/template"
"time"
)
func main() {
var (
tpl *template.Template
format string
output string
export bool
)
flag.StringVar(
&format,
"f",
"ver",
"The output format: env, go, json, mk, rpm, ver")
flag.StringVar(
&output,
"o",
"",
"The output file")
flag.BoolVar(
&export,
"x",
false,
"Export env vars. Used with -f env")
flag.Parse()
if strings.EqualFold("env", format) {
format = "env"
} else if strings.EqualFold("go", format) {
format = "go"
} else if strings.EqualFold("json", format) {
format = "json"
} else if strings.EqualFold("mk", format) {
format = "mk"
} else if strings.EqualFold("rpm", format) {
format = "rpm"
} else if strings.EqualFold("ver", format) {
format = "ver"
} else {
if fileExists(format) {
buf, err := ioutil.ReadFile(format)
if err != nil {
fmt.Fprintf(os.Stderr, "error: read tpl failed: %v\n", err)
os.Exit(1)
}
format = string(buf)
}
tpl = template.Must(template.New("tpl").Parse(format))
format = "tpl"
}
var w io.Writer = os.Stdout
if len(output) > 0 {
fout, err := os.Create(output)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
w = fout
defer fout.Close()
}
gitdesc := chkErr(doExec("git", "describe", "--long", "--dirty"))
rx := regexp.MustCompile(
`^[^\d]*(\d+)\.(\d+)\.(\d+)(?:-([a-zA-Z].+?))?(?:-(\d+)-g(.+?)(?:-(dirty))?)?\s*$`)
m := rx.FindStringSubmatch(gitdesc)
if len(m) == 0 {
fmt.Fprintf(os.Stderr, "error: match git describe failed: %s\n", gitdesc)
os.Exit(1)
}
goos := os.Getenv("XGOOS")
if goos == "" {
goos = runtime.GOOS
}
goarch := os.Getenv("XGOARCH")
if goarch == "" {
goarch = runtime.GOARCH
}
ver := &semver{
GOOS: goos,
GOARCH: goarch,
OS: goosToUname[goos],
Arch: goarchToUname[goarch],
Major: toInt(m[1]),
Minor: toInt(m[2]),
Patch: toInt(m[3]),
Notes: m[4],
Build: toInt(m[5]),
Sha7: m[6],
Sha32: chkErr(doExec("git", "log", "-n1", `--format=%H`)),
Dirty: m[7] != "",
Epoch: toInt64(chkErr(doExec("git", "log", "-n1", `--format=%ct`))),
}
ver.SemVer = ver.String()
ver.SemVerRPM = ver.RPM()
ver.BuildDate = ver.Timestamp().Format("Mon, 02 Jan 2006 15:04:05 MST")
ver.ReleaseDate = ver.Timestamp().Format("06-01-02")
switch format {
case "env":
for _, v := range ver.EnvVars() {
if export {
fmt.Fprint(w, "export ")
}
fmt.Fprintln(w, v)
}
case "go":
case "json":
enc := json.NewEncoder(w)
enc.SetIndent("", " ")
if err := enc.Encode(ver); err != nil {
fmt.Fprintf(os.Stderr, "error: encode to json failed: %v\n", err)
os.Exit(1)
}
case "mk":
for _, v := range ver.EnvVars() {
p := strings.SplitN(v, "=", 2)
key := p[0]
fmt.Fprintf(w, "%s ?=", key)
if len(p) == 1 {
fmt.Fprintln(w)
continue
}
val := p[1]
if strings.HasPrefix(val, `"`) &&
strings.HasSuffix(val, `"`) {
val = val[1 : len(val)-1]
}
val = strings.Replace(val, "$", "$$", -1)
fmt.Fprintf(w, " %s\n", val)
}
case "rpm":
fmt.Fprintln(w, ver.RPM())
case "tpl":
if err := tpl.Execute(w, ver); err != nil {
fmt.Fprintf(os.Stderr, "error: template failed: %v\n", err)
os.Exit(1)
}
case "ver":
fmt.Fprintln(w, ver.String())
}
}
func doExec(cmd string, args ...string) ([]byte, error) {
c := exec.Command(cmd, args...)
c.Stderr = os.Stderr
return c.Output()
}
func chkErr(out []byte, err error) string {
if err == nil {
return strings.TrimSpace(string(out))
}
e, ok := err.(*exec.ExitError)
if !ok {
os.Exit(1)
}
st, ok := e.Sys().(syscall.WaitStatus)
if !ok {
os.Exit(1)
}
os.Exit(st.ExitStatus())
return ""
}
type semver struct {
GOOS string `json:"goos"`
GOARCH string `json:"goarch"`
OS string `json:"os"`
Arch string `json:"arch"`
Major int `json:"major"`
Minor int `json:"minor"`
Patch int `json:"patch"`
Build int `json:"build"`
Notes string `json:"notes"`
Dirty bool `json:"dirty"`
Sha7 string `json:"sha7"`
Sha32 string `json:"sha32"`
Epoch int64 `json:"epoch"`
SemVer string `json:"semver"`
SemVerRPM string `json:"semverRPM"`
BuildDate string `json:"buildDate"`
ReleaseDate string `json:"releaseDate"`
}
func (v *semver) String() string {
buf := &bytes.Buffer{}
fmt.Fprintf(buf, "%d.%d.%d", v.Major, v.Minor, v.Patch)
if len(v.Notes) > 0 {
fmt.Fprintf(buf, "-%s", v.Notes)
}
if v.Build > 0 {
fmt.Fprintf(buf, "+%d", v.Build)
}
if v.Dirty {
fmt.Fprint(buf, "+dirty")
}
return buf.String()
}
func (v *semver) RPM() string {
return strings.Replace(v.String(), "-", "+", -1)
}
func (v *semver) EnvVars() []string {
return []string{
fmt.Sprintf("GOOS=%s", v.GOOS),
fmt.Sprintf("GOARCH=%s", v.GOARCH),
fmt.Sprintf("OS=%s", v.OS),
fmt.Sprintf("ARCH=%s", v.Arch),
fmt.Sprintf("MAJOR=%d", v.Major),
fmt.Sprintf("MINOR=%d", v.Minor),
fmt.Sprintf("PATCH=%d", v.Patch),
fmt.Sprintf("BUILD=%d", v.Build),
fmt.Sprintf("NOTES=\"%s\"", v.Notes),
fmt.Sprintf("DIRTY=%v", v.Dirty),
fmt.Sprintf("SHA7=%s", v.Sha7),
fmt.Sprintf("SHA32=%s", v.Sha32),
fmt.Sprintf("EPOCH=%d", v.Epoch),
fmt.Sprintf("SEMVER=\"%s\"", v.SemVer),
fmt.Sprintf("SEMVER_RPM=\"%s\"", v.SemVerRPM),
fmt.Sprintf("BUILD_DATE=\"%s\"", v.BuildDate),
fmt.Sprintf("RELEASE_DATE=\"%s\"", v.ReleaseDate),
}
}
func (v *semver) Timestamp() time.Time {
return time.Unix(v.Epoch, 0)
}
func toInt(sz string) int {
i, _ := strconv.Atoi(sz)
return i
}
func toInt64(sz string) int64 {
i, _ := strconv.Atoi(sz)
return int64(i)
}
var goosToUname = map[string]string{
"android": "Android",
"darwin": "Darwin",
"dragonfly": "DragonFly",
"freebsd": "kFreeBSD",
"linux": "Linux",
"nacl": "NaCl",
"netbsd": "NetBSD",
"openbsd": "OpenBSD",
"plan9": "Plan9",
"solaris": "Solaris",
"windows": "Windows",
}
var goarchToUname = map[string]string{
"386": "i386",
"amd64": "x86_64",
"amd64p32": "x86_64_P32",
"arm": "ARMv7",
"arm64": "ARMv8",
"mips": "MIPS32",
"mips64": "MIPS64",
"mips64le": "MIPS64LE",
"mipsle": "MIPS32LE",
"ppc64": "PPC64",
"ppc64le": "PPC64LE",
"s390x": "S390X",
}
func fileExists(filePath string) bool {
if _, err := os.Stat(filePath); !os.IsNotExist(err) {
return true
}
return false
}