gitlab: check SearchGroup list length

go-gitlab's SearchGroup() doesn't return error in case a group isn't find,
it only returns an empty list. With that, we must make sure we're not
moving that list around.

Signed-off-by: Bruno Meneguele <bmeneg@redhat.com>

cmd/project_create.go

@@ -49,8 +49,7 @@ lab project create -g mygroup myproject    # mygroup/myproject named myproject`,
 			log.Fatal("path or name must be set")
 		}
 		if g != "" && group != "" {
-
-			log.Fatalf("group can be passed by flag or in path not both\n%s", labUsageFormat(cmd))
+			log.Fatalf("group can be passed by flag or in path, but not both\n%s", labUsageFormat(cmd))
 		}
 		if g != "" {
 			group = g

internal/gitlab/gitlab.go

@@ -24,8 +24,12 @@ import (
 	"github.com/zaquestion/lab/internal/git"
 )
 
-// ErrProjectNotFound is returned when a GitLab project cannot be found.
-var ErrProjectNotFound = errors.New("gitlab project not found, verify you have access to the requested resource")
+var (
+	// ErrProjectNotFound is returned when a GitLab project cannot be found.
+	ErrProjectNotFound = errors.New("gitlab project not found, verify you have access to the requested resource")
+	// ErrGroupNotFound is returned when a GitLab group cannot be found.
+	ErrGroupNotFound = errors.New("gitlab group not found")
+)
 
 var (
 	lab   *gitlab.Client
@@ -946,6 +950,11 @@ func GroupSearch(query string) (*gitlab.Group, error) {
 	if err != nil {
 		return nil, err
 	}
+	// SearchGroup doesn't return error if group isn't found. We need to do
+	// it ourselves.
+	if len(list) == 0 {
+		return nil, ErrGroupNotFound
+	}
 	// if we found a group and we aren't looking for a subgroup
 	if len(list) > 0 && len(groups) == 1 {
 		return list[0], nil