英文:
Go build & exec: fork/exec: permission denied
问题
我需要使用Go工具链构建一个程序，然后执行它。由于分叉导致权限错误，我想知道是否有办法绕过这个错误或者有什么最佳实践？我认为我的程序与Go test工具类似，尽管go test没有出现这种错误。
package main
import (
"os"
"os/exec"
"flag"
log "github.com/golang/glog"
)
func main() {
flag.Parse()
tdir := "abc"
if err := os.MkdirAll(tdir, 0777); err != nil {
log.Error(err)
return
}
f, err := os.Create(tdir + "/main.go")
if err != nil {
log.Error(err)
return
}
if err = f.Chmod(0777); err != nil {
log.Error(err)
return
}
defer f.Close()
defer os.Remove(f.Name())
if _, err = f.Write([]byte(tpl)); err != nil {
log.Error(err)
return
}
cmd := exec.Command("go", "build", "-o", "edoc")
cmd.Path = tdir
b, err := cmd.CombinedOutput()
if err != nil {
log.Errorf("%s, err %v", b, err)
return
}
}
var tpl = `package main
import (
"fmt"
"flag"
)
func main() {
flag.Parse()
fmt.Printf("Hello World")
}
`
错误信息：
E0202 18:24:42.359008 13600 main.go:36] , err fork/exec abc: permission denied
操作系统：OSX 10.11
英文:
I need to build a program using the Go toolchain and then execute it. For some reasons I get a permission error due the forking. Is there a way to circumvent this error or any best practice? I think my program does something similar with Go test tool, though go test doesn't get this kind of error.
package main
import(
"os"
"os/exec"
"flag"
log "github.com/golang/glog"
)
func main(){
flag.Parse()
tdir := "abc"
if err := os.MkdirAll(tdir, 0777); err !=nil{
log.Error(err)
return
}
f, err := os.Create(tdir + "/main.go")
if err !=nil{
log.Error(err)
return
}
if err = f.Chmod(0777); err !=nil{
log.Error(err)
return
}
defer f.Close()
defer os.Remove(f.Name())
if _, err = f.Write([]byte(tpl)); err !=nil{
log.Error(err)
return
}
cmd := exec.Command("go", "build", "-o", "edoc")
cmd.Path = tdir
b, err := cmd.CombinedOutput()
if err !=nil{
log.Errorf("%s, err %v", b, err)
return
}
}
var tpl = `package main
import(
"fmt"
"flag"
)
func main(){
flag.Parse()
fmt.Printf("Hello World")
}`
Error:
E0202 18:24:42.359008 13600 main.go:36] , err fork/exec abc: permission denied
OS: OSX 10.11
答案1
得分: 4
你正在将命令路径从go二进制文件的位置更改为abc。
type Cmd struct {
// Path是要运行的命令的路径。
//
// 这是唯一必须设置为非零值的字段。如果Path是相对路径，则相对于Dir进行评估。
Path string
如果你想要改变工作目录，请使用Cmd.Dir。
英文:
You're changing the command path from the location of your go binary, to abc.
> type Cmd struct {
> // Path is the path of the command to run.
> //
> // This is the only field that must be set to a non-zero
> // value. If Path is relative, it is evaluated relative
> // to Dir.
> Path string
If you want to change the working directory, use Cmd.Dir
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