[libvirt] [PATCH] vshCommandOpt: Do more checking if skipChecks is set

[Michal Privoznik]

Currently if cmd->skipChecks is set (done only from completers)
some basic checks are skipped because we're working over
partially parsed command. See a26ff63ae4 for more detailed
explanation. Anyway, the referenced commit was too aggressive in
disabling checks and effectively returned success even in clear
case of failure. For instance:

  # domif-getlink --interface <TAB><TAB>

causes virshDomainInterfaceCompleter() to be called, which calls
virshDomainGetXML() which eventually calls
vshCommandOptStringReq(.., name = "domain"); The --domain
argument is required for the command and if not present -1 should
be returned to tell the caller the argument was not found. Well,
zero is returned meaning the argument was not found but it's not
required either.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 tools/vsh.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/tools/vsh.c b/tools/vsh.c
index 37c292a03..73ec007e5 100644
--- a/tools/vsh.c
+++ b/tools/vsh.c
@@ -817,18 +817,17 @@ vshCommandOpt(const vshCmd *cmd, const char *name, vshCmdOpt **opt,
     /* See if option is valid and/or required.  */
     *opt = NULL;
 
-    if (!cmd->skipChecks) {
-        while (valid && valid->name) {
-            if (STREQ(name, valid->name))
-                break;
-            valid++;
-        }
+    while (valid && valid->name) {
+        if (STREQ(name, valid->name))
+            break;
+        valid++;
+    }
 
+    if (!cmd->skipChecks)
         assert(valid && (!needData || valid->type != VSH_OT_BOOL));
 
-        if (valid->flags & VSH_OFLAG_REQ)
-            ret = -1;
-    }
+    if (valid && valid->flags & VSH_OFLAG_REQ)
+        ret = -1;
 
     /* See if option is present on command line.  */
     while (candidate) {
@@ -1065,7 +1064,8 @@ vshCommandOptStringReq(vshControl *ctl,
         error = N_("Option argument is empty");
 
     if (error) {
-        vshError(ctl, _("Failed to get option '%s': %s"), name, _(error));
+        if (!cmd->skipChecks)
+            vshError(ctl, _("Failed to get option '%s': %s"), name, _(error));
         return -1;
     }
 
-- 
2.16.1