github.com/ethereum/go-ethereum@v1.14.3/internal/build/gotool.go (about) 1 // Copyright 2021 The go-ethereum Authors 2 // This file is part of the go-ethereum library. 3 // 4 // The go-ethereum library is free software: you can redistribute it and/or modify 5 // it under the terms of the GNU Lesser General Public License as published by 6 // the Free Software Foundation, either version 3 of the License, or 7 // (at your option) any later version. 8 // 9 // The go-ethereum library is distributed in the hope that it will be useful, 10 // but WITHOUT ANY WARRANTY; without even the implied warranty of 11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 // GNU Lesser General Public License for more details. 13 // 14 // You should have received a copy of the GNU Lesser General Public License 15 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>. 16 17 package build 18 19 import ( 20 "fmt" 21 "log" 22 "os" 23 "os/exec" 24 "path/filepath" 25 "runtime" 26 "strings" 27 ) 28 29 type GoToolchain struct { 30 Root string // GOROOT 31 32 // Cross-compilation variables. These are set when running the go tool. 33 GOARCH string 34 GOOS string 35 CC string 36 } 37 38 // Go creates an invocation of the go command. 39 func (g *GoToolchain) Go(command string, args ...string) *exec.Cmd { 40 tool := g.goTool(command, args...) 41 42 // Configure environment for cross build. 43 if g.GOARCH != "" && g.GOARCH != runtime.GOARCH { 44 tool.Env = append(tool.Env, "CGO_ENABLED=1") 45 tool.Env = append(tool.Env, "GOARCH="+g.GOARCH) 46 } 47 if g.GOOS != "" && g.GOOS != runtime.GOOS { 48 tool.Env = append(tool.Env, "GOOS="+g.GOOS) 49 } 50 // Configure C compiler. 51 if g.CC != "" { 52 tool.Env = append(tool.Env, "CC="+g.CC) 53 } else if os.Getenv("CC") != "" { 54 tool.Env = append(tool.Env, "CC="+os.Getenv("CC")) 55 } 56 // CKZG by default is not portable, append the necessary build flags to make 57 // it not rely on modern CPU instructions and enable linking against. 58 tool.Env = append(tool.Env, "CGO_CFLAGS=-O2 -g -D__BLST_PORTABLE__") 59 60 return tool 61 } 62 63 func (g *GoToolchain) goTool(command string, args ...string) *exec.Cmd { 64 if g.Root == "" { 65 g.Root = runtime.GOROOT() 66 } 67 tool := exec.Command(filepath.Join(g.Root, "bin", "go"), command) // nolint: gosec 68 tool.Args = append(tool.Args, args...) 69 tool.Env = append(tool.Env, "GOROOT="+g.Root) 70 71 // Forward environment variables to the tool, but skip compiler target settings. 72 // TODO: what about GOARM? 73 skip := map[string]struct{}{"GOROOT": {}, "GOARCH": {}, "GOOS": {}, "GOBIN": {}, "CC": {}} 74 for _, e := range os.Environ() { 75 if i := strings.IndexByte(e, '='); i >= 0 { 76 if _, ok := skip[e[:i]]; ok { 77 continue 78 } 79 } 80 tool.Env = append(tool.Env, e) 81 } 82 return tool 83 } 84 85 // DownloadGo downloads the Go binary distribution and unpacks it into a temporary 86 // directory. It returns the GOROOT of the unpacked toolchain. 87 func DownloadGo(csdb *ChecksumDB) string { 88 version, err := Version(csdb, "golang") 89 if err != nil { 90 log.Fatal(err) 91 } 92 // Shortcut: if the Go version that runs this script matches the 93 // requested version exactly, there is no need to download anything. 94 activeGo := strings.TrimPrefix(runtime.Version(), "go") 95 if activeGo == version { 96 log.Printf("-dlgo version matches active Go version %s, skipping download.", activeGo) 97 return runtime.GOROOT() 98 } 99 100 ucache, err := os.UserCacheDir() 101 if err != nil { 102 log.Fatal(err) 103 } 104 105 // For Arm architecture, GOARCH includes ISA version. 106 os := runtime.GOOS 107 arch := runtime.GOARCH 108 if arch == "arm" { 109 arch = "armv6l" 110 } 111 file := fmt.Sprintf("go%s.%s-%s", version, os, arch) 112 if os == "windows" { 113 file += ".zip" 114 } else { 115 file += ".tar.gz" 116 } 117 url := "https://golang.org/dl/" + file 118 dst := filepath.Join(ucache, file) 119 if err := csdb.DownloadFile(url, dst); err != nil { 120 log.Fatal(err) 121 } 122 123 godir := filepath.Join(ucache, fmt.Sprintf("geth-go-%s-%s-%s", version, os, arch)) 124 if err := ExtractArchive(dst, godir); err != nil { 125 log.Fatal(err) 126 } 127 goroot, err := filepath.Abs(filepath.Join(godir, "go")) 128 if err != nil { 129 log.Fatal(err) 130 } 131 return goroot 132 } 133 134 // Version returns the versions defined in the checksumdb. 135 func Version(csdb *ChecksumDB, version string) (string, error) { 136 for _, l := range csdb.allChecksums { 137 if !strings.HasPrefix(l, "# version:") { 138 continue 139 } 140 v := strings.Split(l, ":")[1] 141 parts := strings.Split(v, " ") 142 if len(parts) != 2 { 143 log.Print("Erroneous version-string", "v", l) 144 continue 145 } 146 if parts[0] == version { 147 return parts[1], nil 148 } 149 } 150 return "", fmt.Errorf("no version found for '%v'", version) 151 } 152 153 // DownloadAndVerifyChecksums downloads all files and checks that they match 154 // the checksum given in checksums.txt. 155 // This task can be used to sanity-check new checksums. 156 func DownloadAndVerifyChecksums(csdb *ChecksumDB) { 157 var ( 158 base = "" 159 ucache = os.TempDir() 160 ) 161 for _, l := range csdb.allChecksums { 162 if strings.HasPrefix(l, "# https://") { 163 base = l[2:] 164 continue 165 } 166 if strings.HasPrefix(l, "#") { 167 continue 168 } 169 hashFile := strings.Split(l, " ") 170 if len(hashFile) != 2 { 171 continue 172 } 173 file := hashFile[1] 174 url := base + file 175 dst := filepath.Join(ucache, file) 176 if err := csdb.DownloadFile(url, dst); err != nil { 177 log.Print(err) 178 } 179 } 180 }