[RFC PATCH storage 1/2] nfs: create a helper to run rpcinfo commands

[Maximiliano Sandoval <m.sandoval@proxmox.com>]

Will be used in the next command as a fallback in the NFSv3 case.

Signed-off-by: Maximiliano Sandoval <m.sandoval@proxmox.com>
---
 src/PVE/Storage/NFSPlugin.pm | 25 +++++++++++++++----------
 1 file changed, 15 insertions(+), 10 deletions(-)

diff --git a/src/PVE/Storage/NFSPlugin.pm b/src/PVE/Storage/NFSPlugin.pm
index 4cc02c9e..062b3f32 100644
--- a/src/PVE/Storage/NFSPlugin.pm
+++ b/src/PVE/Storage/NFSPlugin.pm
@@ -171,6 +171,20 @@ sub deactivate_storage {
     }
 }
 
+sub tcp_rpcinfo_cmd {
+    my ($server, $version) = @_;
+
+    my $ip = PVE::JSONSchema::pve_verify_ip($server, 1);
+    if (!defined($ip)) {
+        $ip = PVE::Network::get_ip_from_hostname($server);
+    }
+
+    my $transport = PVE::JSONSchema::pve_verify_ipv4($ip, 1) ? 'tcp' : 'tcp6';
+
+    # nfsv4 uses a pseudo-filesystem always beginning with / no exports are listed
+    return ['/usr/sbin/rpcinfo', '-T', $transport, $ip, 'nfs', $version];
+}
+
 sub check_connection {
     my ($class, $storeid, $scfg) = @_;
 
@@ -181,16 +195,7 @@ sub check_connection {
 
     my $is_v4 = defined($opts) && $opts =~ /vers=4.*/;
     if ($is_v4) {
-        my $ip = PVE::JSONSchema::pve_verify_ip($server, 1);
-        if (!defined($ip)) {
-            $ip = PVE::Network::get_ip_from_hostname($server);
-        }
-
-        my $transport = PVE::JSONSchema::pve_verify_ipv4($ip, 1) ? 'tcp' : 'tcp6';
-
-        # nfsv4 uses a pseudo-filesystem always beginning with /
-        # no exports are listed
-        $cmd = ['/usr/sbin/rpcinfo', '-T', $transport, $ip, 'nfs', '4'];
+        $cmd = tcp_rpcinfo_cmd($server, '4');
     } else {
         $cmd = ['/sbin/showmount', '--no-headers', '--exports', $server];
     }
-- 
2.47.3