英文:
unable to see command arguments at OS level issued from exec.Command
问题
我的例程应该从相同的go可执行二进制文件（os.Args[0]）中启动10个子进程，并添加一些有效的命令行参数。所有进程应该在指定的秒数内运行，该秒数在其中一个参数中指定。
func spinChildProcesses() {
cmdParts := make([]string, 4)
cmdParts[0] = "-c"
cmdParts[1] = os.Args[0]
cmdParts[2] = "--duration"
cmdParts[3] = "10000"
for i := 0; i < 10; i++ {
proc := exec.Command("bash", cmdParts...)
go proc.Start()
}
}
func main() {
// 不显示解析持续时间参数的代码
// 创建10个子进程
go spinChildProcesses()
// 设置进程的持续时间并终止
time.Sleep(time.Second * time.Duration(duration))
fmt.Println(" - 进程正常终止")
}
当运行上述代码时，查看操作系统级别，可以看到参数没有传递。只有我键入的根进程具有参数：
ps -ef | grep my-test-pr
root 3806 14446 0 15:23 pts/1 00:00:00 ./my-test-pr --duration 10000
root 3810 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3811 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3813 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3814 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3818 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3823 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3824 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3829 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3836 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3840 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
有什么想法为什么参数没有传递给子进程，以及如何确保参数传递给子进程？
英文:
My routine is supposed to spin 10 child processes from the same go executable binary (os.Args[0]), adding some command line arguments that are valid. All processes should live for a number of seconds, which is specified in one of the arguments.
func spinChildProcesses() {
cmdParts := make([]string, 4)
cmdParts[0] = "-c"
cmdParts[1] = os.Args[0]
cmdParts[2] = "--duration"
cmdParts[3] = "10000"
for i := 0; i < 10; i++ {
proc := exec.Command("bash", cmdParts...)
go proc.Start()
}
}
func main() {
# not showing code that parses duration arg
# create 10 child subprocesses
go spinChildProcesses()
// set a duration to the process and terminate
time.Sleep(time.Second * time.Duration(duration))
fmt.Println(" - process terminating normaly")
}
When the above is run, looking at OS level I can see the arguments are not carried out. Only the root process has the arguments which I typed:
ps -ef | grep my-test-pr
root 3806 14446 0 15:23 pts/1 00:00:00 ./my-test-pr --duration 10000
root 3810 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3811 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3813 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3814 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3818 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3823 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3824 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3829 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3836 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
root 3840 3806 0 15:23 pts/1 00:00:00 ./my-test-pr
Any idea why and how to ensure the arguments are passed to the children processes ?
答案1
得分: 3
-c bash标志接受一个字符串参数进行解释。由于-c的参数只是字符串os.Args[0]，所以bash只执行这个字符串，而忽略了其他参数。
要将要执行的二进制文件的参数提供给bash -c，请将它们连接成一个字符串：
var args []string
args = append(args, os.Args[0])
args = append(args, "--duration")
args = append(args, "10000")
for i := 0; i < 10; i++ {
proc := exec.Command("/bin/bash", "-c", strings.Join(args, " "))
go proc.Start()
}
或者直接执行你的二进制文件，而不需要额外的shell。
英文:
The -c bash flag takes a single string argument to interpret. Since the argument to -c is only the string os.Args[0], that is all bash is executing, and the rest of the args are being ignored.
To provide the arguments to your binary to be executed by bash -c, join them into a single string:
var args []string
args = append(args, os.Args[0])
args = append(args, "--duration")
args = append(args, "10000")
for i := 0; i < 10; i++ {
proc := exec.Command("/bin/bash", "-c", stringsJoin(args, " "))
go proc.Start()
}
Or simply exec your binary directly without the extra shell.
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