1 files changed, 31 insertions, 2 deletions
diff --git a/get_linux.go b/get_linux.go
index 9db8611..e7cd6d0 100644
--- a/get_linux.go
+++ b/get_linux.go
@@ -4,10 +4,39 @@ package hostname
 // data to and from config files
 
 import (
+	"bytes"
+	"fmt"
 	"os"
+	"os/exec"
+	"strings"
 )
 
 func osGetHostname() (string, error) {
-	hostname, err := os.Hostname()
-	return hostname, err
+	host, err := os.Hostname()
+	if err != nil {
+		return host, fmt.Errorf("failed to get hostname: %w", err)
+	}
+
+	domain, err := getDomainName()
+	if err != nil || domain == "" {
+		return host, err
+	}
+
+	return fmt.Sprintf("%s.%s", host, domain), nil
+}
+
+// getDomainName executes the 'domainname' command and returns its output.
+func getDomainName() (string, error) {
+	cmd := exec.Command("domainname")
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	if err := cmd.Run(); err != nil {
+		return "", fmt.Errorf("failed to execute 'domainname': %w", err)
+	}
+	domain := strings.TrimSpace(out.String())
+	if domain == "(none)" {
+		return "", ErrorDomainNameMisconfigured
+	}
+
+	return domain, nil
 }