new: fetch all repositories for an org

Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>

repositories.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+
+	"k8s.io/test-infra/prow/github"
+)
+
+// Repository represents the full name of a repo.
+type Repository struct {
+	Org  string
+	Repo string
+}
+
+func getRepositories(ghClient github.Client, org string) ([]Repository, error) {
+	repos := []Repository{}
+	// Obtain all the repositories in the organization
+	res, err := ghClient.GetRepos(org, false)
+	if err != nil {
+		return nil, fmt.Errorf("Unable to obtain GitHub repositories")
+	}
+	for _, v := range res {
+		// Ignore archived repositories
+		if v.Archived {
+			continue
+		}
+		// Ignore private repositories
+		if v.Private {
+			continue
+		}
+		repos = append(repos, Repository{
+			Org:  org,
+			Repo: v.Name,
+		})
+	}
+	if len(repos) == 0 {
+		return nil, fmt.Errorf("Empty repository list")
+	}
+	return repos, nil
+}