rpmmd: Add NEVRA helper functions to PackageSpec

GetEVRA will return the Epoch:Version-Release.Arch string, and
GetNEVRA will return Name-Epoch:Version-Release.Arch
with Epoch being left off if it is zero.

Also includes tests.

internal/rpmmd/repository.go

@@ -198,6 +198,19 @@ type PackageInfo struct {
 	Dependencies []PackageSpec  `json:"dependencies,omitempty"`
 }
 
+// GetEVRA returns the package's Epoch:Version-Release.Arch string
+func (ps *PackageSpec) GetEVRA() string {
+	if ps.Epoch == 0 {
+		return fmt.Sprintf("%s-%s.%s", ps.Version, ps.Release, ps.Arch)
+	}
+	return fmt.Sprintf("%d:%s-%s.%s", ps.Epoch, ps.Version, ps.Release, ps.Arch)
+}
+
+// GetNEVRA returns the package's Name-Epoch:Version-Release.Arch string
+func (ps *PackageSpec) GetNEVRA() string {
+	return fmt.Sprintf("%s-%s", ps.Name, ps.GetEVRA())
+}
+
 func GetVerStrFromPackageSpecList(pkgs []PackageSpec, packageName string) (string, error) {
 	for _, pkg := range pkgs {
 		if pkg.Name == packageName {

internal/rpmmd/repository_test.go

@@ -0,0 +1,53 @@
+package rpmmd
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPackageSpecGetEVRA(t *testing.T) {
+	specs := []PackageSpec{
+		{
+			Name:    "tmux",
+			Epoch:   0,
+			Version: "3.3a",
+			Release: "3.fc38",
+			Arch:    "x86_64",
+		},
+		{
+			Name:    "grub2",
+			Epoch:   1,
+			Version: "2.06",
+			Release: "94.fc38",
+			Arch:    "noarch",
+		},
+	}
+
+	assert.Equal(t, "3.3a-3.fc38.x86_64", specs[0].GetEVRA())
+	assert.Equal(t, "1:2.06-94.fc38.noarch", specs[1].GetEVRA())
+
+}
+
+func TestPackageSpecGetNEVRA(t *testing.T) {
+	specs := []PackageSpec{
+		{
+			Name:    "tmux",
+			Epoch:   0,
+			Version: "3.3a",
+			Release: "3.fc38",
+			Arch:    "x86_64",
+		},
+		{
+			Name:    "grub2",
+			Epoch:   1,
+			Version: "2.06",
+			Release: "94.fc38",
+			Arch:    "noarch",
+		},
+	}
+
+	assert.Equal(t, "tmux-3.3a-3.fc38.x86_64", specs[0].GetNEVRA())
+	assert.Equal(t, "grub2-1:2.06-94.fc38.noarch", specs[1].GetNEVRA())
+
+}