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install.go
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install.go
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package cmd
import (
"fmt"
"io"
"log"
"os"
"path/filepath"
"strings"
)
func InstallAndExit() {
install := (len(os.Args) == 2 && os.Args[1] == "install")
if install {
err := installToSysPath()
if err != nil {
log.Fatal(err)
}
os.Exit(0)
}
}
func installToSysPath() error {
sysPath := os.Getenv("PATH")
sp := strings.Split(sysPath, ":")
exePath, err := os.Executable()
if err != nil {
return err
}
exePath, _ = readlink(exePath)
name := filepath.Base(exePath)
// check if already installed
for _, path := range sp {
target := filepath.Join(path, name)
target, _ = readlink(target)
if target == exePath {
fmt.Printf("already installed in directory: %s\n", path)
return nil
}
}
for _, path := range sp {
target := filepath.Join(path, name)
// err = os.Rename(exePath, target)
err = move(exePath, target)
if err == nil {
fmt.Printf("OK. %s is moved to directory: %s\n", name, path)
return nil
} else {
log.Printf("try move to '%s' failed: %v", path, err)
}
}
return fmt.Errorf("not installed")
}
func readlink(path string) (string, error) {
hold, err := filepath.EvalSymlinks(path)
if err != nil {
return "", err
}
return filepath.Abs(hold)
}
// move and chmod +x
func move(path string, target string) error {
fin, err := os.Open(path)
if err != nil {
return err
}
defer fin.Close()
if _, err = os.Stat(target); err == nil {
err = os.Remove(target)
if err != nil {
return fmt.Errorf("remove target failed: %w", err)
}
}
fout, err := os.Create(target)
if err != nil {
return err
}
defer fout.Close()
_, err = io.Copy(fout, fin)
if err != nil {
return err
}
err = os.Chmod(target, 0755)
if err != nil {
return err
}
err = os.Remove(path)
if err != nil {
log.Printf("WARN remove '%s' failed: %v", path, err)
}
return nil
}