Make ':' a restricted character for file names

file names for podman load, save, export, and import cannot
contain ":" in them. It is a reserved character for parsing
filenames.

Signed-off-by: umohnani8 <umohnani@redhat.com>

Closes: #694
Approved by: rhatdan

test/e2e/export_test.go

@@ -3,9 +3,10 @@ package integration
 import (
 	"os"
 
+	"path/filepath"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
-	"path/filepath"
 )
 
 var _ = Describe("Podman export", func() {
@@ -43,4 +44,14 @@ var _ = Describe("Podman export", func() {
 		err = os.Remove(outfile)
 		Expect(err).To(BeNil())
 	})
+
+	It("podman export bad filename", func() {
+		_, ec, cid := podmanTest.RunLsContainer("")
+		Expect(ec).To(Equal(0))
+
+		outfile := filepath.Join(podmanTest.TempDir, "container:with:colon.tar")
+		result := podmanTest.Podman([]string{"export", "-o", outfile, cid})
+		result.WaitWithDefaultTimeout()
+		Expect(result.ExitCode()).To(Not(Equal(0)))
+	})
 })