commit f62d4c4143c9a21e488fca658590e1546700586f
from: Connor Taffe <connor.taffe@liveramp.com>
via: Dan Cross <crossd@gmail.com>
date: Mon Feb 01 01:52:49 2021 UTC

9pfuse: support MacFUSE >=4

MacFUSE 4 removes support for passing device fd to the mount command. Adds
support for the receiving the fd over a socket instead, and updates command paths
and filesystem name.

commit - a72478870ae66b7ac1e73b1d22b578cd31852f33
commit + f62d4c4143c9a21e488fca658590e1546700586f
blob - 4c9aac9bf9b6d7711ce4862f94cd1fb4363366be
blob + ea8e3bbf3d5ff0919638b68843669ee6b71c3d63
--- src/cmd/9pfuse/fuse.c
+++ src/cmd/9pfuse/fuse.c
@@ -798,16 +798,19 @@ mountfuse(char *mtpt)
 	}
 	return fd;
 #elif defined(__APPLE__)
-	int i, pid, fd, r;
+	int i, pid, fd, r, p[2];
 	char buf[20];
 	struct vfsconf vfs;
 	char *f, *v;
 
 	if(getvfsbyname(v="osxfusefs", &vfs) < 0 &&
+	   getvfsbyname(v="macfuse", &vfs) < 0 &&
 	   getvfsbyname(v="osxfuse", &vfs) < 0 &&
 	   getvfsbyname(v="fusefs", &vfs) < 0){
 		if(access((v="osxfusefs", f="/Library/Filesystems/osxfusefs.fs"
 			"/Support/load_osxfusefs"), 0) < 0 &&
+		   access((v="macfuse", f="/Library/Filesystems/macfuse.fs"
+			"/Contents/Resources/load_macfuse"), 0) < 0 &&
 		   access((v="osxfuse", f="/Library/Filesystems/osxfuse.fs"
 			"/Contents/Resources/load_osxfuse"), 0) < 0 &&
 		   access((v="osxfuse", f="/opt/local/Library/Filesystems/osxfuse.fs"
@@ -837,6 +840,32 @@ mountfuse(char *mtpt)
 		}
 	}
 
+	/* MacFUSE >=4 dropped support for passing fd */
+	if (strcmp(v, "macfuse") == 0) {
+		if(socketpair(AF_UNIX, SOCK_STREAM, 0, p) < 0)
+			return -1;
+		pid = fork();
+		if(pid < 0)
+			return -1;
+		if(pid == 0){
+			close(p[1]);
+			snprint(buf, sizeof buf, "%d", p[0]);
+			putenv("_FUSE_COMMFD", buf);
+			putenv("_FUSE_COMMVERS", "2");
+			putenv("_FUSE_CALL_BY_LIB", "1");
+			putenv("_FUSE_DAEMON_PATH",
+				"/Library/Filesystems/macfuse.fs/Contents/Resources/mount_macfus");
+			execl("/Library/Filesystems/macfuse.fs/Contents/Resources/mount_macfuse",
+				"mount_macfuse", mtpt, nil);
+			fprint(2, "exec mount_macfuse: %r\n");
+			_exit(1);
+		}
+		close(p[0]);
+		fd = recvfd(p[1]);
+		close(p[1]);
+		return fd;
+	}
+
 	/* Look for available FUSE device. */
 	/*
 	 * We need to truncate `fs` from the end of the vfs name if