[PATCH] virt-admin: Add warning when connection to default daemon fails

[Peter Krempa <pkrempa@xxxxxxxxxx>]

The admin connection defaults to the system-wide 'libvirtd' daemon to
manage (libvirtd:///system). As we've now switched to modular daemons
this will not work for most users out of the box:

 $ virt-admin version
 error: Failed to connect to the admin server
 error: no valid connection
 error: Failed to connect socket to '/run/user/1000/libvirt/libvirt-admin-sock': No such file or directory

As we don't want to assume which daemon the user wants to manage in the
modular topology there's no reasonable default to pick.

Give a hint to the users to use the '-c' if the connection to the
default URI fails:

 $ virt-admin version
 NOTE: Connecting to default daemon. Specify daemon using '-c' (e.g. virtqemud:///system)
 error: Failed to connect to the admin server
 error: no valid connection
 error: Failed to connect socket to '/run/user/1000/libvirt/libvirt-admin-sock': No such file or directory

Signed-off-by: Peter Krempa <pkrempa@xxxxxxxxxx>
---
 tools/virt-admin.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/virt-admin.c b/tools/virt-admin.c
index fa9304c772..aaf6edb9a9 100644
--- a/tools/virt-admin.c
+++ b/tools/virt-admin.c
@@ -102,6 +102,9 @@ vshAdmConnect(vshControl *ctl, unsigned int flags)
     priv->conn = virAdmConnectOpen(ctl->connname, flags);

     if (!priv->conn) {
+        if (!ctl->connname)
+            vshPrintExtra(ctl, "%s", _("NOTE: Connecting to default daemon. Specify daemon using '-c' (e.g. virtqemud:///system)\n"));
+
         if (priv->wantReconnect)
             vshError(ctl, "%s", _("Failed to reconnect to the admin server"));
         else
-- 
2.43.0
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