Treat tenancy as non enterprise

pkg/auth/auth.go

@@ -3,6 +3,7 @@
 package auth
 
 import (
+	"fmt"
 	"os"
 	"os/exec"
 	"strconv"
@@ -148,8 +149,15 @@ func defaultHost(cfg *config.Config) (string, string) {
 	return github, defaultSource
 }
 
+// TenancyHost is the domain name of a tenancy GitHub instance.
+const tenancyHost = "ghe.com"
+
 func isEnterprise(host string) bool {
-	return host != github && host != localhost
+	return host != github && host != localhost && !isTenancy(host)
+}
+
+func isTenancy(host string) bool {
+	return strings.HasSuffix(host, "."+tenancyHost)
 }
 
 func normalizeHostname(host string) string {
@@ -160,5 +168,21 @@ func normalizeHostname(host string) string {
 	if strings.HasSuffix(hostname, "."+localhost) {
 		return localhost
 	}
+	// This has been copied over from the cli/cli NormalizeHostname function
+	// to ensure compatible behaviour but we don't fully understand when or
+	// why it would be useful here. We can't see what harm will come of
+	// duplicating the logic.
+	if before, found := cutSuffix(hostname, "."+tenancyHost); found {
+		idx := strings.LastIndex(before, ".")
+		return fmt.Sprintf("%s.%s", before[idx+1:], tenancyHost)
+	}
 	return hostname
 }
+
+// Backport strings.CutSuffix from Go 1.20.
+func cutSuffix(s, suffix string) (string, bool) {
+	if !strings.HasSuffix(s, suffix) {
+		return s, false
+	}
+	return s[:len(s)-len(suffix)], true
+}

pkg/auth/auth_test.go

@@ -84,6 +84,30 @@ func TestTokenForHost(t *testing.T) {
 			wantToken:  "yyyyyyyyyyyyyyyyyyyy",
 			wantSource: "oauth_token",
 		},
+		{
+			name:        "token for tenant with GH_TOKEN, GITHUB_TOKEN, and config token",
+			host:        "tenant.ghe.com",
+			ghToken:     "GH_TOKEN",
+			githubToken: "GITHUB_TOKEN",
+			config:      testHostsConfig(),
+			wantToken:   "GH_TOKEN",
+			wantSource:  "GH_TOKEN",
+		},
+		{
+			name:        "token for tenant with GITHUB_TOKEN, and config token",
+			host:        "tenant.ghe.com",
+			githubToken: "GITHUB_TOKEN",
+			config:      testHostsConfig(),
+			wantToken:   "GITHUB_TOKEN",
+			wantSource:  "GITHUB_TOKEN",
+		},
+		{
+			name:       "token for tenant with config token",
+			host:       "tenant.ghe.com",
+			config:     testHostsConfig(),
+			wantToken:  "zzzzzzzzzzzzzzzzzzzz",
+			wantSource: "oauth_token",
+		},
 	}
 
 	for _, tt := range tests {
@@ -171,7 +195,7 @@ func TestKnownHosts(t *testing.T) {
 		{
 			name:      "includes authenticated hosts",
 			config:    testHostsConfig(),
-			wantHosts: []string{"github.com", "enterprise.com"},
+			wantHosts: []string{"github.com", "enterprise.com", "tenant.ghe.com"},
 		},
 		{
 			name:      "includes default host if environment auth token",
@@ -184,7 +208,7 @@ func TestKnownHosts(t *testing.T) {
 			config:    testHostsConfig(),
 			ghHost:    "test.com",
 			ghToken:   "TOKEN",
-			wantHosts: []string{"test.com", "github.com", "enterprise.com"},
+			wantHosts: []string{"test.com", "github.com", "enterprise.com", "tenant.ghe.com"},
 		},
 	}
 
@@ -296,6 +320,10 @@ hosts:
     user: user2
     oauth_token: yyyyyyyyyyyyyyyyyyyy
     git_protocol: https
+  tenant.ghe.com:
+    user: user3
+    oauth_token: zzzzzzzzzzzzzzzzzzzz
+    git_protocol: https
 `
 	return config.ReadFromString(data)
 }