From 24064e96d22c8836fefb3689bd1064fdd9eabfc7 Mon Sep 17 00:00:00 2001
From: Ronnie Sahlberg <ronniesahlberg@gmail.com>
Date: Tue, 2 May 2017 17:36:27 -0700
Subject: [PATCH] Add example util for nfs_link()

Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
---
 examples/Makefile.am |   3 +-
 examples/nfs-ln.c    | 125 +++++++++++++++++++++++++++++++++++++++++++
 lib/libnfs-sync.c    |   3 +-
 3 files changed, 129 insertions(+), 2 deletions(-)
 create mode 100644 examples/nfs-ln.c

diff --git a/examples/Makefile.am b/examples/Makefile.am
index 4e55cb9..a0f95e3 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -1,4 +1,4 @@
-noinst_PROGRAMS = nfsclient-async nfsclient-raw nfsclient-sync nfsclient-bcast nfsclient-listservers nfs-io nfs4-cat portmap-client portmap-server
+noinst_PROGRAMS = nfsclient-async nfsclient-raw nfsclient-sync nfsclient-bcast nfsclient-listservers nfs-io nfs-ln nfs4-cat portmap-client portmap-server
 
 if HAVE_TALLOC_TEVENT
 noinst_PROGRAMS += nfs4-cat-talloc
@@ -22,6 +22,7 @@ nfsclient_sync_LDADD = $(COMMON_LIBS)
 nfsclient_bcast_LDADD = $(COMMON_LIBS)
 nfsclient_listservers_LDADD = $(COMMON_LIBS)
 nfs_io_LDADD = $(COMMON_LIBS)
+nfs_ln_LDADD = $(COMMON_LIBS)
 nfs4_cat_LDADD = $(COMMON_LIBS) -levent
 nfs4_cat_talloc_LDADD = $(COMMON_LIBS) -ltevent -ltalloc
 portmap_client_LDADD = $(COMMON_LIBS)
diff --git a/examples/nfs-ln.c b/examples/nfs-ln.c
new file mode 100644
index 0000000..fb33809
--- /dev/null
+++ b/examples/nfs-ln.c
@@ -0,0 +1,125 @@
+/* -*-  mode:c; tab-width:8; c-basic-offset:8; indent-tabs-mode:nil;  -*- */
+/* 
+   Copyright (C) by Ronnie Sahlberg <ronniesahlberg@gmail.com> 2017
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#define _FILE_OFFSET_BITS 64
+#define _GNU_SOURCE
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef AROS
+#include "aros_compat.h"
+#endif
+ 
+#ifdef WIN32
+#include "win32_compat.h"
+#pragma comment(lib, "ws2_32.lib")
+WSADATA wsaData;
+#define PRId64 "ll"
+#else
+#include <inttypes.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#ifndef AROS
+#include <sys/statvfs.h>
+#endif
+#endif
+
+#ifdef HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include "libnfs.h"
+#include "libnfs-raw.h"
+#include "libnfs-raw-mount.h"
+
+void print_usage(void)
+{
+	fprintf(stderr, "Usage: nfs-ln <url> <old-path> <new-path>\n");
+}
+
+int main(int argc, char *argv[])
+{
+	int ret = 1;
+	struct nfs_context *nfs = NULL;
+	struct nfsfh *nfsfh = NULL;
+	struct nfs_url *url = NULL;
+
+#ifdef WIN32
+	if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0) {
+		printf("Failed to start Winsock2\n");
+		exit(10);
+	}
+#endif
+
+#ifdef AROS
+	aros_init_socket();
+#endif
+
+	if (argc != 4) {
+		print_usage();
+		goto finished;
+	}
+
+	nfs = nfs_init_context();
+	if (nfs == NULL) {
+		printf("failed to init context\n");
+		goto finished;
+	}
+
+	url = nfs_parse_url_full(nfs, argv[1]);
+	if (url == NULL) {
+		fprintf(stderr, "%s\n", nfs_get_error(nfs));
+		goto finished;
+	}
+
+	if (nfs_mount(nfs, url->server, url->path) != 0) {
+ 		fprintf(stderr, "Failed to mount nfs share : %s\n",
+			nfs_get_error(nfs));
+		goto finished;
+	}
+	
+	ret = nfs_link(nfs, argv[2], argv[3]);
+	if (ret) {
+ 		fprintf(stderr, "nfs_link() failed with %s\n",
+			nfs_get_error(nfs));
+		goto finished;
+	}
+
+finished:
+	if (ret > 0) {
+		print_usage();
+	}
+	nfs_destroy_url(url);
+	if (nfs != NULL) {		
+		if (nfsfh) {
+			nfs_close(nfs, nfsfh);
+		}
+		nfs_destroy_context(nfs);
+	}
+	return !!ret;
+}
+
diff --git a/lib/libnfs-sync.c b/lib/libnfs-sync.c
index 7569968..ca924d1 100644
--- a/lib/libnfs-sync.c
+++ b/lib/libnfs-sync.c
@@ -1420,7 +1420,8 @@ int nfs_link(struct nfs_context *nfs, const char *oldpath, const char *newpath)
 	cb_data.is_finished = 0;
 
 	if (nfs_link_async(nfs, oldpath, newpath, link_cb, &cb_data) != 0) {
-		nfs_set_error(nfs, "nfs_link_async failed");
+		nfs_set_error(nfs, "nfs_link_async failed: %s",
+			      nfs_get_error(nfs));
 		return -1;
 	}