|
| 1 | +package cmd |
| 2 | + |
| 3 | +import ( |
| 4 | + "archive/tar" |
| 5 | + "compress/gzip" |
| 6 | + "fmt" |
| 7 | + "github.com/spf13/cobra" |
| 8 | + "io" |
| 9 | + "os" |
| 10 | + "os/exec" |
| 11 | + "path/filepath" |
| 12 | + "runtime" |
| 13 | + "sync" |
| 14 | + "syscall" |
| 15 | +) |
| 16 | + |
| 17 | +// NewInstallCmd returns the install command |
| 18 | +func NewInstallCmd() (cmd *cobra.Command) { |
| 19 | + opt := &installOption{} |
| 20 | + cmd = &cobra.Command{ |
| 21 | + Use: "install", |
| 22 | + PreRunE: opt.preRunE, |
| 23 | + RunE: opt.runE, |
| 24 | + } |
| 25 | + |
| 26 | + flags := cmd.Flags() |
| 27 | + //flags.StringVarP(&opt.Mode, "mode", "m", "package", |
| 28 | + // "If you want to install it via platform package manager") |
| 29 | + flags.BoolVarP(&opt.ShowProgress, "show-progress", "", true, "If show the progress of download") |
| 30 | + flags.IntVarP(&opt.Thread, "thread", "t", 0, |
| 31 | + `Download file with multi-threads. It only works when its value is bigger than 1`) |
| 32 | + flags.BoolVarP(&opt.KeepPart, "keep-part", "", false, |
| 33 | + "If you want to keep the part files instead of deleting them") |
| 34 | + flags.StringVarP(&opt.Provider, "provider", "", ProviderGitHub, "The file provider") |
| 35 | + flags.StringVarP(&opt.OS, "os", "", runtime.GOOS, "The OS of target binary file") |
| 36 | + flags.StringVarP(&opt.Arch, "arch", "", runtime.GOARCH, "The arch of target binary file") |
| 37 | + return |
| 38 | +} |
| 39 | + |
| 40 | +type installOption struct { |
| 41 | + downloadOption |
| 42 | + Mode string |
| 43 | +} |
| 44 | + |
| 45 | +func (o *installOption) runE(cmd *cobra.Command, args []string) (err error) { |
| 46 | + if err = o.downloadOption.runE(cmd, args); err != nil { |
| 47 | + return |
| 48 | + } |
| 49 | + |
| 50 | + if err = o.extractFiles(o.Output, o.name); err == nil { |
| 51 | + err = o.overWriteBinary(fmt.Sprintf("%s/%s", filepath.Dir(o.Output), o.name), fmt.Sprintf("/usr/local/bin/%s", o.name)) |
| 52 | + } else { |
| 53 | + err = fmt.Errorf("cannot extract %s from tar file, error: %v", o.Output, err) |
| 54 | + } |
| 55 | + return |
| 56 | +} |
| 57 | + |
| 58 | +func (o *installOption) overWriteBinary(sourceFile, targetPath string) (err error) { |
| 59 | + switch runtime.GOOS { |
| 60 | + case "linux": |
| 61 | + var cp string |
| 62 | + if cp, err = exec.LookPath("cp"); err == nil { |
| 63 | + err = syscall.Exec(cp, []string{"cp", sourceFile, targetPath}, os.Environ()) |
| 64 | + } |
| 65 | + default: |
| 66 | + sourceF, _ := os.Open(sourceFile) |
| 67 | + targetF, _ := os.OpenFile(targetPath, os.O_CREATE|os.O_RDWR, 0664) |
| 68 | + if _, err = io.Copy(targetF, sourceF); err != nil { |
| 69 | + err = fmt.Errorf("cannot copy %s from %s to %v, error: %v", o.name, sourceFile, targetPath, err) |
| 70 | + } |
| 71 | + } |
| 72 | + return |
| 73 | +} |
| 74 | + |
| 75 | +func (o *installOption) extractFiles(tarFile, targetName string) (err error) { |
| 76 | + var f *os.File |
| 77 | + var gzf *gzip.Reader |
| 78 | + if f, err = os.Open(tarFile); err != nil { |
| 79 | + return |
| 80 | + } |
| 81 | + defer func() { |
| 82 | + _ = f.Close() |
| 83 | + }() |
| 84 | + |
| 85 | + if gzf, err = gzip.NewReader(f); err != nil { |
| 86 | + return |
| 87 | + } |
| 88 | + |
| 89 | + tarReader := tar.NewReader(gzf) |
| 90 | + var header *tar.Header |
| 91 | + for { |
| 92 | + if header, err = tarReader.Next(); err == io.EOF { |
| 93 | + err = nil |
| 94 | + break |
| 95 | + } else if err != nil { |
| 96 | + break |
| 97 | + } |
| 98 | + name := header.Name |
| 99 | + |
| 100 | + switch header.Typeflag { |
| 101 | + case tar.TypeReg: |
| 102 | + if name != targetName { |
| 103 | + continue |
| 104 | + } |
| 105 | + var targetFile *os.File |
| 106 | + if targetFile, err = os.OpenFile(fmt.Sprintf("%s/%s", filepath.Dir(tarFile), name), |
| 107 | + os.O_CREATE|os.O_RDWR, os.FileMode(header.Mode)); err != nil { |
| 108 | + break |
| 109 | + } |
| 110 | + if _, err = io.Copy(targetFile, tarReader); err != nil { |
| 111 | + break |
| 112 | + } |
| 113 | + _ = targetFile.Close() |
| 114 | + } |
| 115 | + } |
| 116 | + return |
| 117 | +} |
| 118 | + |
| 119 | +func execCommand(name string, arg ...string) (err error) { |
| 120 | + command := exec.Command(name, arg...) |
| 121 | + |
| 122 | + var stdout []byte |
| 123 | + var errStdout error |
| 124 | + stdoutIn, _ := command.StdoutPipe() |
| 125 | + stderrIn, _ := command.StderrPipe() |
| 126 | + err = command.Start() |
| 127 | + if err != nil { |
| 128 | + return err |
| 129 | + } |
| 130 | + |
| 131 | + // cmd.Wait() should be called only after we finish reading |
| 132 | + // from stdoutIn and stderrIn. |
| 133 | + // wg ensures that we finish |
| 134 | + var wg sync.WaitGroup |
| 135 | + wg.Add(1) |
| 136 | + go func() { |
| 137 | + stdout, errStdout = copyAndCapture(os.Stdout, stdoutIn) |
| 138 | + wg.Done() |
| 139 | + }() |
| 140 | + |
| 141 | + copyAndCapture(os.Stderr, stderrIn) |
| 142 | + |
| 143 | + wg.Wait() |
| 144 | + |
| 145 | + err = command.Wait() |
| 146 | + return |
| 147 | +} |
| 148 | + |
| 149 | +func copyAndCapture(w io.Writer, r io.Reader) ([]byte, error) { |
| 150 | + var out []byte |
| 151 | + buf := make([]byte, 1024, 1024) |
| 152 | + for { |
| 153 | + n, err := r.Read(buf[:]) |
| 154 | + if n > 0 { |
| 155 | + d := buf[:n] |
| 156 | + out = append(out, d...) |
| 157 | + _, err := w.Write(d) |
| 158 | + if err != nil { |
| 159 | + return out, err |
| 160 | + } |
| 161 | + } |
| 162 | + if err != nil { |
| 163 | + // Read returns io.EOF at the end of file, which is not an error for us |
| 164 | + if err == io.EOF { |
| 165 | + err = nil |
| 166 | + } |
| 167 | + return out, err |
| 168 | + } |
| 169 | + } |
| 170 | +} |
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