From 23fb84ef13aacdc2efc3b9de079813c14f6838e9 Mon Sep 17 00:00:00 2001
From: Taylor Blau <me@ttaylorr.com>
Date: Mon, 17 Apr 2017 15:29:23 -0600
Subject: [PATCH] commands/uploader: ignore known supporters of the locking API

---
 commands/uploader.go | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/commands/uploader.go b/commands/uploader.go
index 65e54b97..10ba253b 100644
--- a/commands/uploader.go
+++ b/commands/uploader.go
@@ -2,6 +2,7 @@ package commands
 
 import (
 	"fmt"
+	"net/url"
 	"os"
 	"strconv"
 	"strings"
@@ -135,7 +136,7 @@ func verifyLocks(remote string) (ours, theirs []locking.Lock) {
 		} else {
 			ExitWithError(err)
 		}
-	} else if state == verifyStateUnknown {
+	} else if state == verifyStateUnknown && !supportsLockingAPI(endpoint) {
 		Print("Locking support detected on remote %q. Consider enabling it with:", remote)
 		Print("  $ git config 'lfs.%s.locksverify' true", endpoint.Url)
 	}
@@ -143,6 +144,35 @@ func verifyLocks(remote string) (ours, theirs []locking.Lock) {
 	return ours, theirs
 }
 
+var (
+	// hostsWithKnownLockingSupport is a list of scheme-less hostnames
+	// (without port numbers) that are known to implement the LFS locking
+	// API.
+	//
+	// Additions are welcome.
+	hostsWithKnownLockingSupport = []string{
+		"github.com",
+	}
+)
+
+// supportsLockingAPI returns whether or not a given lfsapi.Endpoint "e"
+// is known to support the LFS locking API by whether or not its hostname is
+// included in the list above.
+func supportsLockingAPI(e lfsapi.Endpoint) bool {
+	u, err := url.Parse(e.Url)
+	if err != nil {
+		tracerx.Printf("commands: unable to parse %q to determine locking support: %v", e.Url, err)
+		return false
+	}
+
+	for _, host := range hostsWithKnownLockingSupport {
+		if u.Hostname() == host {
+			return true
+		}
+	}
+	return false
+}
+
 func (c *uploadContext) scannerError() error {
 	c.errMu.Lock()
 	defer c.errMu.Unlock()