fix virsh's regression

This patch does the following things:
1. The return value of cmdSchedInfoUpdate() can be -1, 0 and 1. So the
   type of return value should be int not bool.(This function is not a
   entry of a virsh command, but the name of this function likes cmdXXX)

2. The type of cmdSchedinfo()'s, cmdFreecell()'s, cmdPoolList()'s and
   cmdVolList()'s return value is bool not int, so change the type of
   variable ret_val, func_ret and functionReturn.

3. Add a variable functionReturn for cmdMigrate(), cmdAttachInterface(),
   cmdDetachInterface(), cmdAttachDisk() and cmdDetachDisk() to save the
   return value.

4. Change the type of variable ret in the function cmdAttachDevice(),
   cmdDetachDevice(), cmdUpdateDevice(), cmdAttachInterface(),
   cmdDetachInterface(), cmdAttachDisk() and cmdDetachDisk() to int, as
   we use it to save the return value of virXXX() and the type of virXXX()'s
   return value is int not bool.

5. Do some cleanup when virBuff.error is 1.

The bug 1-4 were introduced by commit b56fa5bb.

tools/virsh.c

@@ -1593,7 +1593,7 @@ static const vshCmdOptDef opts_schedinfo[] = {
     {NULL, 0, 0, NULL}
 };
 
-static bool
+static int
 cmdSchedInfoUpdate(vshControl *ctl, const vshCmd *cmd,
                    virSchedParameterPtr param)
 {
@@ -1696,7 +1696,7 @@ cmdSchedinfo(vshControl *ctl, const vshCmd *cmd)
     int nparams = 0;
     int update = 0;
     int i, ret;
-    int ret_val = false;
+    bool ret_val = false;
 
     if (!vshConnectionUsability(ctl, ctl->conn))
         return false;
@@ -2288,7 +2288,7 @@ static const vshCmdOptDef opts_freecell[] = {
 static bool
 cmdFreecell(vshControl *ctl, const vshCmd *cmd)
 {
-    int func_ret = false;
+    bool func_ret = false;
     int ret;
     int cell = -1, cell_given;
     unsigned long long memory;
@@ -3847,6 +3847,7 @@ cmdMigrate (vshControl *ctl, const vshCmd *cmd)
     virDomainPtr dom = NULL;
     int p[2] = {-1, -1};
     int ret = -1;
+    bool functionReturn = false;
     virThread workerThread;
     struct pollfd pollfd;
     char retchar;
@@ -3921,15 +3922,15 @@ repoll:
         if (ret > 0) {
             if (saferead(p[0], &retchar, sizeof(retchar)) > 0) {
                 if (retchar == '0') {
-                    ret = true;
+                    functionReturn = true;
                     if (verbose) {
                         /* print [100 %] */
                         print_job_progress(0, 1);
                     }
                 } else
-                    ret = false;
+                    functionReturn = false;
             } else
-                ret = false;
+                functionReturn = false;
             break;
         }
 
@@ -3937,11 +3938,11 @@ repoll:
             if (errno == EINTR) {
                 if (intCaught) {
                     virDomainAbortJob(dom);
-                    ret = false;
                     intCaught = 0;
                 } else
                     goto repoll;
             }
+            functionReturn = false;
             break;
         }
 
@@ -3975,7 +3976,7 @@ cleanup:
     virDomainFree(dom);
     VIR_FORCE_CLOSE(p[0]);
     VIR_FORCE_CLOSE(p[1]);
-    return ret;
+    return functionReturn;
 }
 
 /*
@@ -5952,7 +5953,8 @@ cmdPoolList(vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
 {
     virStoragePoolInfo info;
     char **poolNames = NULL;
-    int i, functionReturn, ret;
+    int i, ret;
+    bool functionReturn;
     int numActivePools = 0, numInactivePools = 0, numAllPools = 0;
     size_t stringLength = 0, nameStrLength = 0;
     size_t autostartStrLength = 0, persistStrLength = 0;
@@ -7525,7 +7527,8 @@ cmdVolList(vshControl *ctl, const vshCmd *cmd ATTRIBUTE_UNUSED)
     double val;
     int details = vshCommandOptBool(cmd, "details");
     int numVolumes = 0, i;
-    int ret, functionReturn;
+    int ret;
+    bool functionReturn;
     int stringLength = 0;
     size_t allocStrLength = 0, capStrLength = 0;
     size_t nameStrLength = 0, pathStrLength = 0;
@@ -8904,7 +8907,7 @@ cmdAttachDevice(vshControl *ctl, const vshCmd *cmd)
     virDomainPtr dom;
     const char *from = NULL;
     char *buffer;
-    bool ret = true;
+    int ret;
     unsigned int flags;
 
     if (!vshConnectionUsability(ctl, ctl->conn))
@@ -8969,7 +8972,7 @@ cmdDetachDevice(vshControl *ctl, const vshCmd *cmd)
     virDomainPtr dom;
     const char *from = NULL;
     char *buffer;
-    bool ret = true;
+    int ret;
     unsigned int flags;
 
     if (!vshConnectionUsability(ctl, ctl->conn))
@@ -9035,7 +9038,7 @@ cmdUpdateDevice(vshControl *ctl, const vshCmd *cmd)
     virDomainPtr dom;
     const char *from = NULL;
     char *buffer;
-    bool ret = true;
+    int ret;
     unsigned int flags;
 
     if (!vshConnectionUsability(ctl, ctl->conn))
@@ -9110,7 +9113,8 @@ cmdAttachInterface(vshControl *ctl, const vshCmd *cmd)
     const char *mac = NULL, *target = NULL, *script = NULL,
                 *type = NULL, *source = NULL, *model = NULL;
     int typ;
-    bool ret = false;
+    int ret;
+    bool functionReturn = false;
     unsigned int flags;
     virBuffer buf = VIR_BUFFER_INITIALIZER;
     char *xml;
@@ -9165,7 +9169,7 @@ cmdAttachInterface(vshControl *ctl, const vshCmd *cmd)
 
     if (virBufferError(&buf)) {
         vshPrint(ctl, "%s", _("Failed to allocate XML buffer"));
-        return false;
+        goto cleanup;
     }
 
     xml = virBufferContentAndReset(&buf);
@@ -9183,17 +9187,16 @@ cmdAttachInterface(vshControl *ctl, const vshCmd *cmd)
 
     if (ret != 0) {
         vshError(ctl, "%s", _("Failed to attach interface"));
-        ret = false;
     } else {
         vshPrint(ctl, "%s", _("Interface attached successfully\n"));
-        ret = true;
+        functionReturn = true;
     }
 
  cleanup:
     if (dom)
         virDomainFree(dom);
     virBufferFreeAndReset(&buf);
-    return ret;
+    return functionReturn;
 }
 
 /*
@@ -9226,7 +9229,8 @@ cmdDetachInterface(vshControl *ctl, const vshCmd *cmd)
     char *doc;
     char buf[64];
     int i = 0, diff_mac;
-    bool ret = false;
+    int ret;
+    int functionReturn = false;
     unsigned int flags;
 
     if (!vshConnectionUsability(ctl, ctl->conn))
@@ -9322,10 +9326,9 @@ cmdDetachInterface(vshControl *ctl, const vshCmd *cmd)
 
     if (ret != 0) {
         vshError(ctl, "%s", _("Failed to detach interface"));
-        ret = false;
     } else {
         vshPrint(ctl, "%s", _("Interface detached successfully\n"));
-        ret = true;
+        functionReturn = true;
     }
 
  cleanup:
@@ -9337,7 +9340,7 @@ cmdDetachInterface(vshControl *ctl, const vshCmd *cmd)
         xmlFreeDoc(xml);
     if (xml_buf)
         xmlBufferFree(xml_buf);
-    return ret;
+    return functionReturn;
 }
 
 /*
@@ -9368,7 +9371,8 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
     virDomainPtr dom = NULL;
     const char *source = NULL, *target = NULL, *driver = NULL,
                 *subdriver = NULL, *type = NULL, *mode = NULL;
-    bool isFile = false, ret = false;
+    bool isFile = false, functionReturn = false;
+    int ret;
     unsigned int flags;
     const char *stype = NULL;
     virBuffer buf = VIR_BUFFER_INITIALIZER;
@@ -9460,17 +9464,16 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
 
     if (ret != 0) {
         vshError(ctl, "%s", _("Failed to attach disk"));
-        ret = false;
     } else {
         vshPrint(ctl, "%s", _("Disk attached successfully\n"));
-        ret = true;
+        functionReturn = true;
     }
 
  cleanup:
     if (dom)
         virDomainFree(dom);
     virBufferFreeAndReset(&buf);
-    return ret;
+    return functionReturn;
 }
 
 /*
@@ -9501,7 +9504,8 @@ cmdDetachDisk(vshControl *ctl, const vshCmd *cmd)
     const char *target = NULL;
     char *doc;
     int i = 0, diff_tgt;
-    bool ret = false;
+    int ret;
+    bool functionReturn = false;
     unsigned int flags;
 
     if (!vshConnectionUsability(ctl, ctl->conn))
@@ -9582,10 +9586,9 @@ cmdDetachDisk(vshControl *ctl, const vshCmd *cmd)
 
     if (ret != 0) {
         vshError(ctl, "%s", _("Failed to detach disk"));
-        ret = false;
     } else {
         vshPrint(ctl, "%s", _("Disk detached successfully\n"));
-        ret = true;
+        functionReturn = true;
     }
 
  cleanup:
@@ -9597,7 +9600,7 @@ cmdDetachDisk(vshControl *ctl, const vshCmd *cmd)
         xmlBufferFree(xml_buf);
     if (dom)
         virDomainFree(dom);
-    return ret;
+    return functionReturn;
 }
 
 /*