github.com/goplus/gop@v1.2.6/env/version.go (about) 1 /* 2 * Copyright (c) 2021 The GoPlus Authors (goplus.org). All rights reserved. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package env 18 19 import ( 20 "bytes" 21 "os" 22 "os/exec" 23 "path/filepath" 24 "strings" 25 ) 26 27 const ( 28 MainVersion = "1.2" 29 ) 30 31 // buildVersion is the GoPlus tree's version string at build time. 32 // This is set by the linker. 33 var ( 34 buildVersion string 35 ) 36 37 func init() { 38 initEnv() 39 } 40 41 func initEnv() { 42 if buildVersion == "" { 43 initEnvByGop() 44 return 45 } 46 if !strings.HasPrefix(buildVersion, "v"+MainVersion+".") { 47 panic("gop/env: [FATAL] Invalid buildVersion: " + buildVersion) 48 } 49 } 50 51 func initEnvByGop() { 52 if fname := filepath.Base(os.Args[0]); !isGopCmd(fname) { 53 if ret, err := gopEnv(); err == nil { 54 parts := strings.SplitN(strings.TrimRight(ret, "\n"), "\n", 3) 55 if len(parts) == 3 { 56 buildVersion, buildDate, defaultGopRoot = parts[0], parts[1], parts[2] 57 } 58 } 59 } 60 } 61 62 var gopEnv = func() (string, error) { 63 var b bytes.Buffer 64 cmd := exec.Command("gop", "env", "GOPVERSION", "BUILDDATE", "GOPROOT") 65 cmd.Stdout = &b 66 err := cmd.Run() 67 return b.String(), err 68 } 69 70 // Installed checks is `gop` installed or not. 71 // If returns false, it means `gop` is not installed or not in PATH. 72 func Installed() bool { 73 return buildVersion != "" 74 } 75 76 // Version returns the GoPlus tree's version string. 77 // It is either the commit hash and date at the time of the build or, 78 // when possible, a release tag like "v1.0.0-rc1". 79 func Version() string { 80 if buildVersion == "" { 81 return "v" + MainVersion + ".x" 82 } 83 return buildVersion 84 }