golang implements chcon

In Linux systems, the security label of a file or directory is part of the SELinux mechanism. To modify security labels, you can use the command line tool chcon. However, how to implement the chcon command in golang?

In golang, it is a common practice to use the exec package to execute external commands. Therefore, the chcon command can be called using the exec package. Use the following code snippet to execute the chcon command:

cmd := exec.Command("chcon", "context", "file")
output, err := cmd.CombinedOutput()
if err != nil {
    log.Fatal(err)
}
fmt.Println(string(output))

In the above code, the Command function accepts the command to be executed and its parameters, and returns a pointer of type Cmd. Use the CombinedOutput method to run a command and return the combined results of standard output and standard error output.

Let’s look at a complete example. The following code implements a command line tool that can change the SELinux security label of a file or directory with a specified path to a specified label:

package main

import (
    "flag"
    "fmt"
    "log"
    "os"
    "os/exec"
)

func main() {
    var context string
    var path string
    flag.StringVar(&context, "c", "", "set SELinux context to `context`")
    flag.StringVar(&path, "p", "", "set SELinux context for `path`")
    flag.Parse()

    if context == "" {
        log.Fatal("missing required option -c")
    }
    if path == "" {
        log.Fatal("missing required option -p")
    }

    cmd := exec.Command("chcon", context, path)
    output, err := cmd.CombinedOutput()
    if err != nil {
        fmt.Fprintf(os.Stderr, "chcon failed: %v
", err)
        os.Exit(1)
    }
    fmt.Println(string(output))
}

In this example In, the flag package is used to parse command line parameters. By determining whether the required parameters are specified, errors in performing unexpected file changes are avoided. Use the fmt.Fprintf function to output error information to the standard error output to notify the user of the operation failure before the program terminates.

Save the above code as chcon.go, use go build to generate the executable file, and place the generated binary file in the PATH environment variable to achieve global calling.

In short, using the exec package to execute external commands can easily implement the chcon command in golang. Using command line parameters to parse package flags can ensure that unexpected errors do not occur during program execution.

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