Check for empty deployment targets and matchers

Fixes #9220

deploy/deployConfig.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !nodeploy
 // +build !nodeploy
 
 package deploy
@@ -24,6 +25,7 @@ import (
 	hglob "github.com/gohugoio/hugo/hugofs/glob"
 	"github.com/gohugoio/hugo/media"
 	"github.com/mitchellh/mapstructure"
+	"github.com/pkg/errors"
 )
 
 const deploymentConfigKey = "deployment"
@@ -124,12 +126,18 @@ func decodeConfig(cfg config.Provider) (deployConfig, error) {
 		return dcfg, err
 	}
 	for _, tgt := range dcfg.Targets {
+		if tgt == nil {
+			return dcfg, errors.New("empty deployment target")
+		}
 		if err := tgt.parseIncludeExclude(); err != nil {
 			return dcfg, err
 		}
 	}
 	var err error
 	for _, m := range dcfg.Matchers {
+		if m == nil {
+			return dcfg, errors.New("empty deployment matcher")
+		}
 		m.re, err = regexp.Compile(m.Pattern)
 		if err != nil {
 			return dcfg, fmt.Errorf("invalid deployment.matchers.pattern: %v", err)

deploy/deployConfig_test.go

@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//go:build !nodeploy
 // +build !nodeploy
 
 package deploy
@@ -21,7 +22,6 @@ import (
 
 	qt "github.com/frankban/quicktest"
 	"github.com/gohugoio/hugo/config"
-
 )
 
 func TestDecodeConfigFromTOML(t *testing.T) {
@@ -169,3 +169,33 @@ func TestDecodeConfigDefault(t *testing.T) {
 	c.Assert(len(dcfg.Targets), qt.Equals, 0)
 	c.Assert(len(dcfg.Matchers), qt.Equals, 0)
 }
+
+func TestEmptyTarget(t *testing.T) {
+	c := qt.New(t)
+
+	tomlConfig := `
+[deployment]
+[[deployment.targets]]
+`
+	cfg, err := config.FromConfigString(tomlConfig, "toml")
+	c.Assert(err, qt.IsNil)
+
+	_, err = decodeConfig(cfg)
+	c.Assert(err, qt.Not(qt.IsNil))
+}
+
+func TestEmptyMatcher(t *testing.T) {
+	c := qt.New(t)
+
+	tomlConfig := `
+[deployment]
+[[deployment.matchers]]
+`
+	cfg, err := config.FromConfigString(tomlConfig, "toml")
+	c.Assert(err, qt.IsNil)
+
+	_, err = decodeConfig(cfg)
+	c.Assert(err, qt.Not(qt.IsNil))
+
+	fmt.Printf("JMM-1: %s", err)
+}