github.com/Asutorufa/yuhaiin@v0.3.6-0.20240502055049-7984da7023a0/pkg/utils/goos/goos.go (about)

     1  // Copyright 2014 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build ignore
     6  
     7  package main
     8  
     9  import (
    10  	"bytes"
    11  	"fmt"
    12  	"log"
    13  	"os"
    14  	"strings"
    15  )
    16  
    17  // Copyright 2015 The Go Authors. All rights reserved.
    18  // Use of this source code is governed by a BSD-style
    19  // license that can be found in the LICENSE file.
    20  
    21  // package goos contains GOOS-specific constants.
    22  
    23  // The next line makes 'go generate' write the zgoos*.go files with
    24  // per-OS information, including constants named Is$GOOS for every
    25  // known GOOS. The constant is 1 on the current system, 0 otherwise;
    26  // multiplying by them is useful for defining GOOS-specific constants.
    27  //
    28  //go:generate go run gengoos.go
    29  
    30  var gooses []string
    31  
    32  func main() {
    33  	data, err := os.ReadFile("syslist.go")
    34  	if err != nil {
    35  		log.Fatal(err)
    36  	}
    37  	const goosPrefix = `var knownOS = map[string]bool{`
    38  	inGOOS := false
    39  	for _, line := range strings.Split(string(data), "\n") {
    40  		if strings.HasPrefix(line, goosPrefix) {
    41  			inGOOS = true
    42  		} else if inGOOS && strings.HasPrefix(line, "}") {
    43  			break
    44  		} else if inGOOS {
    45  			goos := strings.Fields(line)[0]
    46  			goos = strings.TrimPrefix(goos, `"`)
    47  			goos = strings.TrimSuffix(goos, `":`)
    48  			gooses = append(gooses, goos)
    49  		}
    50  	}
    51  
    52  	for _, target := range gooses {
    53  		if target == "nacl" {
    54  			continue
    55  		}
    56  		var tags []string
    57  		if target == "linux" {
    58  			tags = append(tags, "!android") // must explicitly exclude android for linux
    59  		}
    60  		if target == "solaris" {
    61  			tags = append(tags, "!illumos") // must explicitly exclude illumos for solaris
    62  		}
    63  		if target == "darwin" {
    64  			tags = append(tags, "!ios") // must explicitly exclude ios for darwin
    65  		}
    66  		tags = append(tags, target) // must explicitly include target for bootstrapping purposes
    67  		var buf bytes.Buffer
    68  		fmt.Fprintf(&buf, "// Code generated by gengoos.go using 'go generate'. DO NOT EDIT.\n\n")
    69  		fmt.Fprintf(&buf, "//go:build %s\n\n", strings.Join(tags, " && "))
    70  		fmt.Fprintf(&buf, "package goos\n\n")
    71  		fmt.Fprintf(&buf, "const GOOS = `%s`\n\n", target)
    72  		for _, goos := range gooses {
    73  			value := 0
    74  			if goos == target {
    75  				value = 1
    76  			}
    77  			fmt.Fprintf(&buf, "const Is%s = %d\n", strings.Title(goos), value)
    78  		}
    79  		err := os.WriteFile("zgoos_"+target+".go", buf.Bytes(), 0666)
    80  		if err != nil {
    81  			log.Fatal(err)
    82  		}
    83  	}
    84  }