/
chowner.go
47 lines (42 loc) · 1.15 KB
/
chowner.go
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package main
import (
"fmt"
"log"
"os"
"os/user"
"strconv"
)
func main() {
// Check command line arguments
if len(os.Args) != 4 {
fmt.Println("Change the owner of a file.")
fmt.Println("Usage: " + os.Args[0] + " <user> <group> <filepath>")
fmt.Println("Example: " + os.Args[0] + " dano dano test.txt")
fmt.Println("Example: sudo " + os.Args[0] + " root root test.txt")
os.Exit(1)
}
username := os.Args[1]
groupname := os.Args[2]
filePath := os.Args[3]
// Look up user based on name and get ID
userInfo, err := user.Lookup(username)
if err != nil {
log.Fatal("Error looking up user "+username+". ", err)
}
uid, err := strconv.Atoi(userInfo.Uid)
if err != nil {
log.Fatal("Error converting "+userInfo.Uid+" to integer. ", err)
}
// Look up group name and get group ID
group, err := user.LookupGroup(groupname)
if err != nil {
log.Fatal("Error looking up group "+groupname+". ", err)
}
gid, err := strconv.Atoi(group.Gid)
if err != nil {
log.Fatal("Error converting "+group.Gid+" to integer. ", err)
}
fmt.Printf("Changing owner of %s to %s(%d):%s(%d).\n",
filePath, username, uid, groupname, gid)
os.Chown(filePath, uid, gid)
}