fix: generate ssh host keys for linux guest (#15303)

Co-authored-by: Qiu Jian <qiujian@yunionyun.com>

pkg/hostman/guestfs/fsdriver/interface.go

@@ -56,6 +56,8 @@ type IDiskPartition interface {
 	IsReadonly() bool
 	GetPhysicalPartitionType() string
 	Zerofree()
+
+	GenerateSshHostKeys() error
 }
 
 type IRootFsDriver interface {

pkg/hostman/guestfs/fsdriver/linux.go

@@ -337,6 +337,14 @@ func (l *sLinuxRootFs) DeployNetworkingScripts(rootFs IDiskPartition, nics []*ty
 			return errors.Wrapf(err, "write %s fail", dockerDaemonConfPath)
 		}
 	}
+	// deploy ssh host key
+	{
+		err := rootFs.GenerateSshHostKeys()
+		if err != nil {
+			// ignore error
+			log.Errorf("rootFs.GenerateSshHostKeys fail %s", err)
+		}
+	}
 	return nil
 }
 

pkg/hostman/guestfs/kvmpart/localfs.go

@@ -310,3 +310,13 @@ func (f *SLocalGuestFS) FilePutContents(sPath, content string, modAppend, caseIn
 		return fmt.Errorf("Cann't put content")
 	}
 }
+
+func (f *SLocalGuestFS) GenerateSshHostKeys() error {
+	cmd := []string{"chroot", f.mountPath, "ssh-keygen", "-A"}
+	output, err := procutils.NewCommand(cmd[0], cmd[1:]...).Output()
+	if err != nil {
+		log.Errorf("ssh-keygen host keys fail: %s, %s", err, output)
+		return fmt.Errorf("%s", output)
+	}
+	return nil
+}

pkg/hostman/guestfs/sshpart/sshpart.go

@@ -610,3 +610,9 @@ func MountSSHRootfs(tool *disktool.SSHPartitionTool, term *ssh.Client, layouts [
 	}
 	return nil, nil, fmt.Errorf("Fail to find rootfs")
 }
+
+func (p *SSHPartition) GenerateSshHostKeys() error {
+	cmd := fmt.Sprintf("/usr/sbin/chroot %s /usr/bin/ssh-keygen -A", p.mountPath)
+	_, err := p.term.Run(cmd)
+	return errors.Wrap(err, "GenerateSshHostKeys")
+}