Merge pull request #9 from dennisdegreef/supportCustomGnupgHome

Respect the GNUPGHOME environment variable

lookup/localpgp.go

@@ -29,14 +29,27 @@ type LocalPGPService struct {
 // NewLocalPGPService creates a new LocalPGPService if it finds a local
 // public keyring; otherwise it bails.
 func NewLocalPGPService() (*LocalPGPService, error) {
-	ringfile := path.Join(os.Getenv("HOME"), ".gnupg", "pubring.gpg")
 
-	info, err := os.Stat(ringfile)
+	service := &LocalPGPService{}
+	service.buildRingfileName()
+
+	info, err := os.Stat(service.ringfile)
 	if err != nil || info.Size() == 0 {
 		return nil, err
 	}
 
-	return &LocalPGPService{ringfile: ringfile}, nil
+	return service, nil
+}
+
+func (l *LocalPGPService) buildRingfileName() {
+	gnupgHome := path.Join(os.Getenv("HOME"), ".gnupg")
+
+	// Check if an override for GNUPG home is set
+	if os.Getenv("GNUPGHOME") != "" {
+		gnupgHome = os.Getenv("GNUPGHOME")
+	}
+
+	l.ringfile = path.Join(gnupgHome, "pubring.gpg")
 }
 
 // Ring loads the local public keyring so LocalPGPService can use it later. If

lookup/localpgp_test.go

@@ -10,6 +10,7 @@ the source. If not, see http://www.gnu.org/licenses/gpl-2.0.html.
 package lookup
 
 import (
+	"os"
 	"testing"
 
 	"github.com/stretchr/testify/suite"
@@ -48,6 +49,38 @@ func (s *LocalPGPTest) TestIsMatchFailsWithoutMatches() {
 	s.False(local.isMatch("foo", user))
 }
 
+func (s *LocalPGPTest) TestGnupgHomeOverride() {
+	os.Setenv("GNUPGHOME", "/foo")
+	_, err := NewLocalPGPService()
+	s.EqualError(err, "stat /foo/pubring.gpg: no such file or directory")
+	os.Unsetenv("GNUPGHOME")
+}
+
+func (s *LocalPGPTest) TestBuildRingfileName() {
+	cases := []struct {
+		home      string
+		gnupghome string
+		expected  string
+	}{
+		{"/foo/", "", "/foo/.gnupg/pubring.gpg"},
+		{"/foo", "", "/foo/.gnupg/pubring.gpg"},
+		{"foo", "", "foo/.gnupg/pubring.gpg"},
+		{"foo", "/things", "/things/pubring.gpg"},
+		{"foo", "/things/", "/things/pubring.gpg"},
+		{"foo", "things/", "things/pubring.gpg"},
+		{"", "/things/", "/things/pubring.gpg"},
+		{"", "", ".gnupg/pubring.gpg"},
+	}
+
+	for _, c := range cases {
+		os.Setenv("HOME", c.home)
+		os.Setenv("GNUPGHOME", c.gnupghome)
+		local := LocalPGPService{}
+		local.buildRingfileName()
+		s.Equal(c.expected, local.ringfile)
+	}
+}
+
 func TestLocalPGPTest(t *testing.T) {
 	suite.Run(t, new(LocalPGPTest))
 }