work on setting the hostname in the patchset

1 files changed, 53 insertions, 0 deletions

diff --git a/hostname.go b/hostname.go
new file mode 100644
index 0000000..85d61c6
--- /dev/null
+++ b/hostname.go
@@ -0,0 +1,53 @@
+// +build linux
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"syscall"
+)
+
+// scutil --get ComputerName
+
+// getDomainName fetches the domain name using the getdomainname syscall.
+func getDomainName() (string, error) {
+	var buf [256]byte
+	err := syscall.Getdomainname(buf[:])
+	if err != nil {
+		return "", fmt.Errorf("failed to get domain name: %w", err)
+	}
+	// Trim null bytes
+	n := 0
+	for ; n < len(buf); n++ {
+		if buf[n] == 0 {
+			break
+		}
+	}
+	return string(buf[:n]), nil
+}
+
+// GetFullHostname returns the hostname + domain name (if set).
+func GetFullHostname() (string, error) {
+	host, err := os.Hostname()
+	if err != nil {
+		return "", fmt.Errorf("failed to get hostname: %w", err)
+	}
+
+	domain, err := getDomainName()
+	if err != nil || domain == "" {
+		return host, nil // fallback to short hostname
+	}
+
+	return fmt.Sprintf("%s.%s", host, domain), nil
+}
+
+func main() {
+	fqdn, err := GetFullHostname()
+	if err != nil {
+		fmt.Println("Error:", err)
+		return
+	}
+	fmt.Println("Hostname + Domain:", fqdn)
+}
+