virsh: Require --xpath for *dumpxml

Historically, the dumpxml command reject any unknown arguments,
for instance:

    virsh dumpxml fedora xxx

However, after v8.5.0-rc1~31 the second argument ('xxx') is
treated as an XPath, but it's not that clearly visible.
Therefore, require the --xpath switch, like this:

    virsh dumpxml fedora --xpath xxx

Yes, this breaks already released virsh, but I think we can argue
that the pool of users of this particular function is very small.
We also document the argument being mandatory:

   dumpxml [--inactive] [--security-info] [--update-cpu] [--migratable]
           [--xpath EXPRESSION] [--wrap] domain

The sooner we do this change, the better.

The same applies for other *dumpxml functions (net-dumpxml,
pool-dumpxml, vol-dumpxl to name a few).

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2103524
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

tools/virsh-backup.c

@@ -117,6 +117,7 @@ static const vshCmdOptDef opts_backup_dumpxml[] = {
     VIRSH_COMMON_OPT_DOMAIN_FULL(VIR_CONNECT_LIST_DOMAINS_ACTIVE),
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-checkpoint.c

@@ -854,6 +854,7 @@ static const vshCmdOptDef opts_checkpoint_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-domain.c

@@ -4529,6 +4529,7 @@ static const vshCmdOptDef opts_save_image_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },
@@ -4961,6 +4962,7 @@ static const vshCmdOptDef opts_managed_save_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },
@@ -10469,6 +10471,7 @@ static const vshCmdOptDef opts_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-interface.c

@@ -472,6 +472,7 @@ static const vshCmdOptDef opts_interface_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-network.c

@@ -351,6 +351,7 @@ static const vshCmdOptDef opts_network_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },
@@ -1556,6 +1557,7 @@ static const vshCmdOptDef opts_network_port_dumpxml[] = {
     VIRSH_COMMON_OPT_NETWORK_PORT(0),
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-nodedev.c

@@ -567,6 +567,7 @@ static const vshCmdOptDef opts_node_device_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-nwfilter.c

@@ -188,6 +188,7 @@ static const vshCmdOptDef opts_nwfilter_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },
@@ -610,6 +611,7 @@ static const vshCmdOptDef opts_nwfilter_binding_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-pool.c

@@ -777,6 +777,7 @@ static const vshCmdOptDef opts_pool_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-secret.c

@@ -140,6 +140,7 @@ static const vshCmdOptDef opts_secret_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-snapshot.c

@@ -1609,6 +1609,7 @@ static const vshCmdOptDef opts_snapshot_dumpxml[] = {
     },
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },

tools/virsh-volume.c

@@ -1161,6 +1161,7 @@ static const vshCmdOptDef opts_vol_dumpxml[] = {
     VIRSH_COMMON_OPT_POOL_OPTIONAL,
     {.name = "xpath",
      .type = VSH_OT_STRING,
+     .flags = VSH_OFLAG_REQ_OPT,
      .completer = virshCompleteEmpty,
      .help = N_("xpath expression to filter the XML document")
     },