From 8fd6c63a93c8aa32a2ad2ed960f828b570265709 Mon Sep 17 00:00:00 2001
From: Anand K Mistry <amistry@chromium.org>
Date: Thu, 11 Apr 2019 11:14:13 -0700
Subject: [PATCH] Use a dummy mount mode when the mountpoint /dev/fd/%d

A mountpoint of /dev/fd/%d is special and indicates that the fuse
mountpoint has already been set up. Since the path isn't a directory, it
won't have the expected mode bits which are verified in the ssh
connection setup.
---
 sshfs.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

--- a/sshfs.c
+++ b/sshfs.c
@@ -4027,6 +4027,8 @@ int main(int argc, char *argv[])
 		char *mountpoint;
 		int multithreaded;
 		int foreground;
+		int fuse_fd;
+		int len = 0;
 #if !defined(__APPLE__) && !defined(__CYGWIN__)
 		struct stat st;
 #endif
@@ -4042,12 +4044,17 @@ int main(int argc, char *argv[])
 		}
 
 #if !defined(__APPLE__) && !defined(__CYGWIN__)
-		res = stat(mountpoint, &st);
-		if (res == -1) {
-			perror(mountpoint);
-			exit(1);
+		if (sscanf(mountpoint, "/dev/fd/%u%n", &fuse_fd, &len) == 1 &&
+		    len == strlen(mountpoint)) {
+			sshfs.mnt_mode = S_IFDIR | 0755;
+		} else {
+			res = stat(mountpoint, &st);
+			if (res == -1) {
+				perror(mountpoint);
+				exit(1);
+			}
+			sshfs.mnt_mode = st.st_mode;
 		}
-		sshfs.mnt_mode = st.st_mode;
 #else
 		sshfs.mnt_mode = S_IFDIR | 0755;
 #endif
-- 
2.11.0