[libvirt] [PATCH 1/5]: Return exitstatus from virStorageBackendRunProgRegex

[Chris Lalancette <clalance redhat com>]

This patch changes things around so that virStorageBackendRunProgRegex() does
*not* virStorageReportError() if the fork()/exec() process it spawned returned a
!= 0 exit code.  Rather, it returns the exitcode in this case, and it is up to
the higher level to determine whether this is a fatal error or not.  The use
case for this change is in the iSCSI stuff; older versions of iscsiadm tools
would return a failure when getting the session number, despite the command
succeeding.

Changes since last time:
1)  Fix up whitespace damage

Signed-off-by: Chris Lalancette <clalance redhat com>


diff -urp libvirt.orig/src/storage_backend.c libvirt.runprogregex/src/storage_backend.c
--- libvirt.orig/src/storage_backend.c	2008-06-06 13:09:57.000000000 +0200
+++ libvirt.runprogregex/src/storage_backend.c	2008-06-16 14:22:12.000000000 +0200
@@ -352,7 +352,8 @@ virStorageBackendRunProgRegex(virConnect
                               const char **regex,
                               int *nvars,
                               virStorageBackendListVolRegexFunc func,
-                              void *data)
+                              void *data,
+                              int *outexit)
 {
     int child = 0, fd = -1, exitstatus, err, failed = 1;
     FILE *list = NULL;
@@ -487,12 +488,8 @@ virStorageBackendRunProgRegex(virConnect
         return -1;
     } else {
         if (WIFEXITED(exitstatus)) {
-            if (WEXITSTATUS(exitstatus) != 0) {
-                virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
-                                      _("non-zero exit status from command %d"),
-                                      WEXITSTATUS(exitstatus));
-                return -1;
-            }
+            if (outexit != NULL)
+                *outexit = WEXITSTATUS(exitstatus);
         } else {
             virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
                                   "%s", _("command did not exit cleanly"));
diff -urp libvirt.orig/src/storage_backend.h libvirt.runprogregex/src/storage_backend.h
--- libvirt.orig/src/storage_backend.h	2008-04-10 18:53:29.000000000 +0200
+++ libvirt.runprogregex/src/storage_backend.h	2008-06-16 14:22:46.000000000 +0200
@@ -133,7 +133,8 @@ int virStorageBackendRunProgRegex(virCon
                                   const char **regex,
                                   int *nvars,
                                   virStorageBackendListVolRegexFunc func,
-                                  void *data);
+                                  void *data,
+                                  int *exitstatus);
 
 int virStorageBackendRunProgNul(virConnectPtr conn,
                                 virStoragePoolObjPtr pool,
diff -urp libvirt.orig/src/storage_backend_iscsi.c libvirt.runprogregex/src/storage_backend_iscsi.c
--- libvirt.orig/src/storage_backend_iscsi.c	2008-06-06 13:09:57.000000000 +0200
+++ libvirt.runprogregex/src/storage_backend_iscsi.c	2008-06-16 14:24:40.000000000 +0200
@@ -124,13 +124,18 @@ virStorageBackendISCSISession(virConnect
     };
     char *session = NULL;
 
+    /* Note that we ignore the exitstatus.  Older versions of iscsiadm tools
+     * returned an exit status of > 0, even if they succeeded.  We will just
+     * rely on whether session got filled in properly.
+     */
     if (virStorageBackendRunProgRegex(conn, pool,
                                       prog,
                                       1,
                                       regexes,
                                       vars,
                                       virStorageBackendISCSIExtractSession,
-                                      &session) < 0)
+                                      &session,
+                                      NULL) < 0)
         return NULL;
 
     if (session == NULL) {
@@ -373,7 +378,7 @@ virStorageBackendISCSIFindLUNs(virConnec
                                          regexes,
                                          vars,
                                          virStorageBackendISCSIMakeLUN,
-                                         (void *)session);
+                                         (void *)session, NULL);
 }
 
 
diff -urp libvirt.orig/src/storage_backend_logical.c libvirt.runprogregex/src/storage_backend_logical.c
--- libvirt.orig/src/storage_backend_logical.c	2008-06-06 13:09:57.000000000 +0200
+++ libvirt.runprogregex/src/storage_backend_logical.c	2008-06-16 14:26:09.000000000 +0200
@@ -214,14 +214,30 @@ virStorageBackendLogicalFindLVs(virConne
         pool->def->name, NULL
     };
 
-    return virStorageBackendRunProgRegex(conn,
-                                         pool,
-                                         prog,
-                                         1,
-                                         regexes,
-                                         vars,
-                                         virStorageBackendLogicalMakeVol,
-                                         vol);
+    int exitstatus;
+
+    if (virStorageBackendRunProgRegex(conn,
+                                      pool,
+                                      prog,
+                                      1,
+                                      regexes,
+                                      vars,
+                                      virStorageBackendLogicalMakeVol,
+                                      vol,
+                                      &exitstatus) < 0) {
+        virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+                              _("lvs command failed"));
+                              return -1;
+    }
+
+    if (exitstatus != 0) {
+        virStorageReportError(conn, VIR_ERR_INTERNAL_ERROR,
+                              _("lvs command failed with exitstatus %d"),
+                              exitstatus);
+        return -1;
+    }
+
+    return 0;
 }
 
 static int
@@ -347,6 +363,7 @@ virStorageBackendLogicalRefreshPool(virC
         "--nosuffix", "--options", "vg_size,vg_free",
         pool->def->name, NULL
     };
+    int exitstatus;
 
     /* Get list of all logical volumes */
     if (virStorageBackendLogicalFindLVs(conn, pool, NULL) < 0) {
@@ -362,7 +379,13 @@ virStorageBackendLogicalRefreshPool(virC
                                       regexes,
                                       vars,
                                       virStorageBackendLogicalRefreshPoolFunc,
-                                      NULL) < 0) {
+                                      NULL,
+                                      &exitstatus) < 0) {
+        virStoragePoolObjClearVols(pool);
+        return -1;
+    }
+
+    if (exitstatus != 0) {
         virStoragePoolObjClearVols(pool);
         return -1;
     }