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bug#39670: Cannot mount NFS share as user or root

From: maxim . cournoyer
Subject: bug#39670: Cannot mount NFS share as user or root
Date: Thu, 20 Feb 2020 11:25:37 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)


Maxim Cournoyer <address@hidden> writes:
> I encountered this too.  Perhaps we should patch some references to
> mount.nfs (from nfs-utils) in the util-linux package which provides
> 'mount'.
> In the meantime, you should use "mount.nfs" directly.

I've looked into patching util-linux to reference explicitly the
mount.nfs helper, and I think this should do it:

--8<---------------cut here---------------start------------->8---
modified   libmount/src/context.c
@@ -1939,8 +1939,13 @@ int mnt_context_prepare_helper(struct libmnt_context 
*cxt, const char *name,
                struct stat st;
                int rc;
-               rc = snprintf(helper, sizeof(helper), "%s/%s.%s",
-                                               path, name, type);
+               if (startswith(type, "nfs")) {
+                 rc = snprintf(helper, sizeof(helper), 
+               } else {
+                 rc = snprintf(helper, sizeof(helper), "%s/%s.%s",
+                               path, name, type);
+               }
                path = strtok_r(NULL, ":", &p);
                if (rc < 0 || (size_t) rc >= sizeof(helper))

--8<---------------cut here---------------end--------------->8---

But, adding nfs-utils to util-linux creates a dependency cycle which is
bothersome to resolve (nfs-utils requires eudev through lvm2, as well as
util-linux itself).

I've also realised that when I was using 'sudo mount.nfs ...' it
wouldn't work because it'd look up the root user's PATH for the helper.
'sudo -E mount.nfs ...' should work.

We should document that the 'nfs-utils' package needs to be added to the
operating system declaration packages field when NFS file systems are


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