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[libvirt] [PATCH v2] Add a virt-host-validate command to sanity check HV config



From: "Daniel P. Berrange" <berrange redhat com>

To assist people in verifying that their host is operating in an
optimal manner, provide a 'virt-host-validate' command. For each
type of hypervisor, it will check any pre-requisites, or other
good recommendations and report what's working & what is not.

eg

  # virt-host-validate
  QEMU: Checking for device /dev/kvm                                         : FAIL (Check that the 'kvm-intel' or 'kvm-amd' modules are loaded & the BIOS has enabled virtualization)
  QEMU: Checking for device /dev/vhost                                       : WARN (Load the 'vhost_net' module to improve performance of virtio networking)
  QEMU: Checking for device /dev/net/tun                                     : PASS
   LXC: Checking for Linux >= 2.6.26                                         : PASS

This warns people if they have vmx/svm, but don't have /dev/kvm. It
also warns about missing /dev/vhost net.

In version 2:

  - Add to RPM specs
  - Add man page
  - Use getopt to parse --help, --version & --quiet options
  - Don't use VT100 escape codes unless on a tty
  - Disable QEMU / LXC checks if not compiled into libvirt

---
 tools/Makefile.am                 |   33 ++++++-
 tools/virt-host-validate-common.c |  214 +++++++++++++++++++++++++++++++++++++
 tools/virt-host-validate-common.h |   57 ++++++++++
 tools/virt-host-validate-lxc.c    |   37 +++++++
 tools/virt-host-validate-lxc.h    |   27 +++++
 tools/virt-host-validate-qemu.c   |   52 +++++++++
 tools/virt-host-validate-qemu.h   |   27 +++++
 tools/virt-host-validate.c        |  213 ++++++++++++++++++++++++++++++++++++
 8 files changed, 658 insertions(+), 2 deletions(-)
 create mode 100644 tools/virt-host-validate-common.c
 create mode 100644 tools/virt-host-validate-common.h
 create mode 100644 tools/virt-host-validate-lxc.c
 create mode 100644 tools/virt-host-validate-lxc.h
 create mode 100644 tools/virt-host-validate-qemu.c
 create mode 100644 tools/virt-host-validate-qemu.h
 create mode 100644 tools/virt-host-validate.c

diff --git a/tools/Makefile.am b/tools/Makefile.am
index 6705546..6596a51 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -30,14 +30,18 @@ EXTRA_DIST = \
 DISTCLEANFILES =
 
 bin_SCRIPTS = virt-xml-validate virt-pki-validate
-bin_PROGRAMS = virsh
+bin_PROGRAMS = virsh virt-host-validate
 
 if HAVE_SANLOCK
 sbin_SCRIPTS = virt-sanlock-cleanup
 DISTCLEANFILES += virt-sanlock-cleanup
 endif
 
-dist_man1_MANS = virt-xml-validate.1 virt-pki-validate.1 virsh.1
+dist_man1_MANS = \
+		virt-host-validate.1 \
+		virt-pki-validate.1 \
+		virt-xml-validate.1 \
+		virsh.1
 if HAVE_SANLOCK
 dist_man8_MANS = virt-sanlock-cleanup.8
 endif
@@ -56,6 +60,9 @@ virt-pki-validate: virt-pki-validate.in Makefile
 virt-pki-validate.1: virt-pki-validate.in
 	$(AM_V_GEN)$(POD2MAN) $< $(srcdir)/$@
 
+virt-host-validate.1: virt-host-validate.c
+	$(AM_V_GEN)$(POD2MAN) $< $(srcdir)/$@
+
 virt-sanlock-cleanup: virt-sanlock-cleanup.in Makefile
 	$(AM_V_GEN)sed -e 's,[ ]SYSCONFDIR@,$(sysconfdir),' \
 	    -e 's,[ ]LOCALSTATEDIR@,$(localstatedir),' < $< > $@ \
@@ -64,6 +71,28 @@ virt-sanlock-cleanup: virt-sanlock-cleanup.in Makefile
 virt-sanlock-cleanup.8: virt-sanlock-cleanup.in
 	$(AM_V_GEN)$(POD2MAN) $< $(srcdir)/$@
 
+virt_host_validate_SOURCES = \
+		virt-host-validate.c \
+		virt-host-validate-common.c virt-host-validate-common.h \
+		virt-host-validate-qemu.c virt-host-validate-qemu.h \
+		virt-host-validate-lxc.c virt-host-validate-lxc.h \
+		$(NULL)
+
+virt_host_validate_LDFLAGS = \
+		$(WARN_LDFLAGS) \
+		$(COVERAGE_LDFLAGS) \
+		$(NULL)
+
+virt_host_validate_LDADD = \
+		../src/libvirt.la				\
+		../gnulib/lib/libgnu.la				\
+		$(NULL)
+
+virt_host_validate_CFLAGS = \
+		$(WARN_CFLAGS)					\
+		$(COVERAGE_CFLAGS)				\
+		$(NULL)
+
 virsh_SOURCES =							\
 		console.c console.h				\
 		virsh.c
diff --git a/tools/virt-host-validate-common.c b/tools/virt-host-validate-common.c
new file mode 100644
index 0000000..e8cff85
--- /dev/null
+++ b/tools/virt-host-validate-common.c
@@ -0,0 +1,214 @@
+/*
+ * virt-host-validate-common.c: Sanity check helper APis
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#include <config.h>
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/utsname.h>
+
+#include "util.h"
+#include "memory.h"
+#include "virfile.h"
+#include "virt-host-validate-common.h"
+
+static bool quiet;
+
+void virHostMsgSetQuiet(bool quietFlag)
+{
+    quiet = quietFlag;
+}
+
+void virHostMsgCheck(const char *prefix,
+                     const char *format,
+                     ...)
+{
+    va_list args;
+    char *msg;
+
+    if (quiet)
+        return;
+
+    va_start(args, format);
+    if (virVasprintf(&msg, format, args) < 0) {
+        perror("malloc");
+        abort();
+    }
+    va_end(args);
+
+    fprintf(stdout, _("%6s: Checking %-60s: "), prefix, msg);
+    VIR_FREE(msg);
+}
+
+static bool virHostMsgWantEscape(void)
+{
+    static bool detectTty = true;
+    static bool wantEscape = false;
+    if (detectTty) {
+        if (isatty(STDOUT_FILENO))
+            wantEscape = true;
+        detectTty = false;
+    }
+    return wantEscape;
+}
+
+void virHostMsgPass(void)
+{
+    if (quiet)
+        return;
+
+    if (virHostMsgWantEscape())
+        fprintf(stdout, "\033[32m%s\033[0m\n", _("PASS"));
+    else
+        fprintf(stdout, "%s\n", _("PASS"));
+}
+
+
+static const char * failMessages[] = {
+    N_("FAIL"),
+    N_("WARN"),
+    N_("NOTE"),
+};
+
+verify(ARRAY_CARDINALITY(failMessages) == VIR_HOST_VALIDATE_LAST);
+
+static const char *failEscapeCodes[] = {
+    "\033[31m",
+    "\033[33m",
+    "\033[34m",
+};
+
+verify(ARRAY_CARDINALITY(failEscapeCodes) == VIR_HOST_VALIDATE_LAST);
+
+void virHostMsgFail(virHostValidateLevel level,
+                    const char *hint)
+{
+    if (virHostMsgWantEscape())
+        fprintf(stdout, "%s%s\033[0m (%s)\n",
+                failEscapeCodes[level], _(failMessages[level]), hint);
+    else
+        fprintf(stdout, "%s (%s)\n",
+                _(failMessages[level]), hint);
+}
+
+
+int virHostValidateDevice(const char *hvname,
+                          const char *devname,
+                          virHostValidateLevel level,
+                          const char *hint)
+{
+    virHostMsgCheck(hvname, "for device %s", devname);
+
+    if (access(devname, R_OK|W_OK) < 0) {
+        virHostMsgFail(level, hint);
+        return -1;
+    }
+
+    virHostMsgPass();
+    return 0;
+}
+
+
+int virHostValidateHasCPUFlag(const char *name)
+{
+    FILE *fp = fopen("/proc/cpuinfo", "r");
+    int ret = 0;
+
+    if (!fp)
+        return 0;
+
+    do {
+        char line[1024];
+
+        if (!fgets(line, sizeof(line), fp))
+            break;
+
+        if (strstr(line, name)) {
+            ret = 1;
+            break;
+        }
+    } while (1);
+
+    VIR_FORCE_FCLOSE(fp);
+
+    return ret;
+}
+
+
+int virHostValidateLinuxKernel(const char *hvname,
+                               int version,
+                               virHostValidateLevel level,
+                               const char *hint)
+{
+    struct utsname uts;
+    int major, minor, micro;
+    unsigned long thisversion;
+
+    uname(&uts);
+
+    virHostMsgCheck(hvname, _("for Linux >= %d.%d.%d"),
+                    ((version >> 16) & 0xff),
+                    ((version >> 8) & 0xff),
+                    (version & 0xff));
+
+    if (STRNEQ(uts.sysname, "Linux")) {
+        virHostMsgFail(level, hint);
+        return -1;
+    }
+
+    if (virParseVersionString(uts.release, &thisversion, true) < 0) {
+        virHostMsgFail(level, hint);
+        return -1;
+    }
+
+    micro = (thisversion & 0xff);
+    minor = ((thisversion >> 8) & 0xff);
+    major = ((thisversion >> 16) & 0xff);
+
+    if (major > ((version >> 16) & 0xff)) {
+        virHostMsgPass();
+        return 0;
+    } else if (major < ((version >> 16) & 0xff)) {
+        virHostMsgFail(level, hint);
+        return -1;
+    }
+
+    if (minor > ((version >> 8) & 0xff)) {
+        virHostMsgPass();
+        return 0;
+    } else if (minor < ((version >> 8) & 0xff)) {
+        virHostMsgFail(level, hint);
+        return -1;
+    }
+
+    if (micro > (version & 0xff)) {
+        virHostMsgPass();
+        return 0;
+    } else if (micro < (version & 0xff)) {
+        virHostMsgFail(level, hint);
+        return -1;
+    }
+
+    virHostMsgPass();
+    return 0;
+}
diff --git a/tools/virt-host-validate-common.h b/tools/virt-host-validate-common.h
new file mode 100644
index 0000000..99b09b6
--- /dev/null
+++ b/tools/virt-host-validate-common.h
@@ -0,0 +1,57 @@
+/*
+ * virt-host-validate-common.h: Sanity check helper APis
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#ifndef __VIRT_HOST_VALIDATE_COMMON_H__
+#define __VIRT_HOST_VALIDATE_COMMON_H__
+
+#include "internal.h"
+
+typedef enum {
+    VIR_HOST_VALIDATE_FAIL,
+    VIR_HOST_VALIDATE_WARN,
+    VIR_HOST_VALIDATE_NOTE,
+
+    VIR_HOST_VALIDATE_LAST,
+} virHostValidateLevel;
+
+extern void virHostMsgSetQuiet(bool quietFlag);
+
+extern void virHostMsgCheck(const char *prefix,
+                            const char *format,
+                            ...) ATTRIBUTE_FMT_PRINTF(2, 3);
+
+extern void virHostMsgPass(void);
+extern void virHostMsgFail(virHostValidateLevel level,
+                           const char *hint);
+
+extern int virHostValidateDevice(const char *hvname,
+                                 const char *devname,
+                                 virHostValidateLevel level,
+                                 const char *hint);
+
+extern int virHostValidateHasCPUFlag(const char *name);
+
+extern int virHostValidateLinuxKernel(const char *hvname,
+                                      int version,
+                                      virHostValidateLevel level,
+                                      const char *hint);
+
+#endif /* __VIRT_HOST_VALIDATE_COMMON_H__ */
diff --git a/tools/virt-host-validate-lxc.c b/tools/virt-host-validate-lxc.c
new file mode 100644
index 0000000..9d69b67
--- /dev/null
+++ b/tools/virt-host-validate-lxc.c
@@ -0,0 +1,37 @@
+/*
+ * virt-host-validate-lxc.c: Sanity check a LXC hypervisor host
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#include <config.h>
+
+#include "virt-host-validate-lxc.h"
+#include "virt-host-validate-common.h"
+
+int virHostValidateLXC(void)
+{
+    int ret = 0;
+
+    if (virHostValidateLinuxKernel("LXC", (2 << 16) | (6 << 8) | 26,
+                                   VIR_HOST_VALIDATE_FAIL,
+                                   _("Upgrade to a kernel supporting namespaces")) < 0)
+        ret = -1;
+
+    return ret;
+}
diff --git a/tools/virt-host-validate-lxc.h b/tools/virt-host-validate-lxc.h
new file mode 100644
index 0000000..ef824be
--- /dev/null
+++ b/tools/virt-host-validate-lxc.h
@@ -0,0 +1,27 @@
+/*
+ * virt-host-validate-lxc.h: Sanity check a LXC hypervisor host
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#ifndef __VIRT_HOST_VALIDATE_LXC_H__
+#define __VIRT_HOST_VALIDATE_LXC_H__
+
+extern int virHostValidateLXC(void);
+
+#endif /* __VIRT_HOST_VALIDATE_LXC_H__ */
diff --git a/tools/virt-host-validate-qemu.c b/tools/virt-host-validate-qemu.c
new file mode 100644
index 0000000..d3a82cc
--- /dev/null
+++ b/tools/virt-host-validate-qemu.c
@@ -0,0 +1,52 @@
+/*
+ * virt-host-validate-qemu.c: Sanity check a QEMU hypervisor host
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#include <config.h>
+
+#include "virt-host-validate-qemu.h"
+#include "virt-host-validate-common.h"
+
+int virHostValidateQEMU(void)
+{
+    int ret = 0;
+
+    if (virHostValidateHasCPUFlag("svm") ||
+        virHostValidateHasCPUFlag("vmx")) {
+        if (virHostValidateDevice("QEMU", "/dev/kvm",
+                                  VIR_HOST_VALIDATE_FAIL,
+                                  _("Check that the 'kvm-intel' or 'kvm-amd' modules are "
+                                    "loaded & the BIOS has enabled virtualization")) < 0)
+            ret = -1;
+    }
+
+    if (virHostValidateDevice("QEMU", "/dev/vhost-net",
+                              VIR_HOST_VALIDATE_WARN,
+                              _("Load the 'vhost_net' module to improve performance "
+                                "of virtio networking")) < 0)
+        ret = -1;
+
+    if (virHostValidateDevice("QEMU", "/dev/net/tun",
+                              VIR_HOST_VALIDATE_FAIL,
+                              _("Load the 'tun' module to enable networking for QEMU guests")) < 0)
+        ret = -1;
+
+    return ret;
+}
diff --git a/tools/virt-host-validate-qemu.h b/tools/virt-host-validate-qemu.h
new file mode 100644
index 0000000..3e79d51
--- /dev/null
+++ b/tools/virt-host-validate-qemu.h
@@ -0,0 +1,27 @@
+/*
+ * virt-host-validate-qemu.h: Sanity check a QEMU hypervisor host
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#ifndef __VIRT_HOST_VALIDATE_QEMU_H__
+#define __VIRT_HOST_VALIDATE_QEMU_H__
+
+extern int virHostValidateQEMU(void);
+
+#endif /* __VIRT_HOST_VALIDATE_QEMU_H__ */
diff --git a/tools/virt-host-validate.c b/tools/virt-host-validate.c
new file mode 100644
index 0000000..06fee58
--- /dev/null
+++ b/tools/virt-host-validate.c
@@ -0,0 +1,213 @@
+/*
+ * virt-host-check.c: Sanity check a hypervisor host
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
+ *
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <gettext.h>
+#include <getopt.h>
+
+#include "internal.h"
+#include "configmake.h"
+
+#include "virt-host-validate-common.h"
+#if WITH_QEMU
+#include "virt-host-validate-qemu.h"
+#endif
+#if WITH_LXC
+#include "virt-host-validate-lxc.h"
+#endif
+
+static void
+show_help(FILE *out, const char *argv0)
+{
+    fprintf(out,
+            _("\n"
+              "syntax: %s [OPTIONS] [HVTYPE]\n"
+              "\n"
+              " Hypervisor types:\n"
+              "\n"
+              "   - qemu\n"
+              "   - lxc\n"
+              "\n"
+              " Options:\n"
+              "   -h, --help     Display command line help\n"
+              "   -v, --version  Display command version\n"
+              "   -q, --quiet    Don't display progress information\n"
+              "\n"),
+            argv0);
+}
+
+static void
+show_version(FILE *out, const char *argv0)
+{
+    fprintf(out, "version: %s %s\n", argv0, VERSION);
+}
+
+static const struct option argOptions[] = {
+    { "help", 0, NULL, 'h', },
+    { "version", 0, NULL, 'v', },
+    { "quiet", 0, NULL, 'q', },
+    { NULL, 0, NULL, '\0', }
+};
+
+int
+main(int argc, char **argv)
+{
+    const char *hvname = NULL;
+    int c;
+    int ret = EXIT_SUCCESS;
+    bool quiet = false;
+
+    if (!setlocale(LC_ALL, "")) {
+        perror("setlocale");
+        /* failure to setup locale is not fatal */
+    }
+    if (!bindtextdomain(PACKAGE, LOCALEDIR)) {
+        perror("bindtextdomain");
+        return EXIT_FAILURE;
+    }
+    if (!textdomain(PACKAGE)) {
+        perror("textdomain");
+        return EXIT_FAILURE;
+    }
+
+    while ((c = getopt_long(argc, argv, "hvq", argOptions, NULL)) != -1) {
+        switch (c) {
+        case 'v':
+            show_version(stdout, argv[0]);
+            return EXIT_SUCCESS;
+
+        case 'h':
+            show_help(stdout, argv[0]);
+            return EXIT_SUCCESS;
+
+        case 'q':
+            quiet = true;
+            break;
+
+        case '?':
+        default:
+            show_help(stderr, argv[0]);
+            return EXIT_FAILURE;
+        }
+    }
+
+    if ((argc-optind) > 2) {
+        fprintf(stderr, _("%s: too many command line arguments\n"), argv[0]);
+        show_help(stderr, argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    if (argc > 1)
+        hvname = argv[optind];
+
+    virHostMsgSetQuiet(quiet);
+
+#if WITH_QEMU
+    if ((!hvname || STREQ(hvname, "qemu")) &&
+        virHostValidateQEMU() < 0)
+        ret = EXIT_FAILURE;
+#endif
+
+#if WITH_LXC
+    if ((!hvname || STREQ(hvname, "lxc")) &&
+        virHostValidateLXC() < 0)
+        ret = EXIT_FAILURE;
+#endif
+
+    return ret;
+}
+
+/*
+
+=pod
+
+=head1 NAME
+
+  virt-host-validate - validate host virtualization setup
+
+=head1 SYNOPSIS
+
+  virt-host-validate [OPTIONS...] [HV-TYPE]
+
+=head1 DESCRIPTION
+
+This tool validates that the host is configured in a suitable
+way to run libvirt hypervisor drivers. If invoked without any
+arguments it will check support for all hypervisor drivers it
+is aware of. Optionally it can be given a particular hypervisor
+type ('qemu' or 'lxc') to restrict the checks to those relevant
+for that virtualization technology
+
+=head1 OPTIONS
+
+=over 4
+
+=item C<-v>, C<--version>
+
+Display the command version
+
+=item C<-h>, C<--help>
+
+Display the command line help
+
+=item C<-q>, C<--quiet>
+
+Don't display details of individual checks being performed.
+Only display output if a check does not pass.
+
+=back
+
+=head1 EXIT STATUS
+
+Upon successful validation, an exit status of 0 will be set. Upon
+failure a non-zero status will be set.
+
+=head1 AUTHOR
+
+Daniel P. Berrange
+
+=head1 BUGS
+
+Report any bugs discovered to the libvirt community via the
+mailing list C<http://libvirt.org/contact.html> or bug tracker C<http://libvirt.org/bugs.html>.
+Alternatively report bugs to your software distributor / vendor.
+
+=head1 COPYRIGHT
+
+Copyright (C) 2012 by Red Hat, Inc.
+
+=head1 LICENSE
+
+virt-host-validate is distributed under the terms of the GNU GPL v2+.
+This is free software; see the source for copying conditions. There
+is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
+PURPOSE
+
+=head1 SEE ALSO
+
+C<virsh(1)>, C<virt-pki-validate>, C<virt-xml-validate>
+
+=cut
+
+*/
-- 
1.7.7.6


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