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[Libguestfs] [PATCH 3/5] tools: Make warnings about running on live guests more prominent.



A timely warning not to try running certain tools on live VMs.
Sys::Guestfs::Lib detects this some of the time, but can't do
it always.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.
http://et.redhat.com/~rjones/virt-p2v
>From 5c4bf92bc298e078ceccdde603313282d038544c Mon Sep 17 00:00:00 2001
From: Richard Jones <rjones redhat com>
Date: Mon, 19 Oct 2009 10:45:44 +0100
Subject: [PATCH 3/5] tools: Make warnings about running on live guests more prominent.

Add prominent warnings to the man pages about how it is dangerous
to run these tools against live guests.
---
 tools/virt-edit   |    9 ++++++---
 tools/virt-rescue |   16 ++++++++++------
 2 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/tools/virt-edit b/tools/virt-edit
index 46e86a1..9196a66 100755
--- a/tools/virt-edit
+++ b/tools/virt-edit
@@ -40,14 +40,17 @@ virt-edit - Edit a file in a virtual machine
 
  virt-edit [--options] disk.img [disk.img ...] file
 
+=head1 WARNING
+
+You must I<not> use C<virt-edit> on live virtual machines.  If you do
+this, you risk disk corruption in the VM.  C<virt-edit> tries to stop
+you from doing this, but doesn't catch all cases.
+
 =head1 DESCRIPTION
 
 C<virt-edit> is a command line tool to edit C<file> where C<file>
 exists in the named virtual machine (or disk image).
 
-B<Note> you must I<not> use virt-edit on live virtual machines.  If
-you do this, you risk disk corruption in the VM.
-
 If you want to just view a file, use L<virt-cat(1)>.  For more complex
 cases you should look at the L<guestfish(1)> tool.
 
diff --git a/tools/virt-rescue b/tools/virt-rescue
index 9ad2fa4..4f90ab1 100755
--- a/tools/virt-rescue
+++ b/tools/virt-rescue
@@ -37,6 +37,16 @@ virt-rescue - Run a rescue shell on a virtual machine
 
  virt-rescue [--options] disk.img [disk.img ...]
 
+=head1 WARNING
+
+You must I<not> use C<virt-rescue> on live virtual machines.  Doing so
+will probably result in disk corruption in the VM.  C<virt-rescue>
+tries to stop you from doing this, but doesn't catch all cases.
+
+However if you use the I<--ro> (read only) option, then you can attach
+a shell to a live virtual machine, but the results might be strange or
+inconsistent at times (but you won't get disk corruption).
+
 =head1 DESCRIPTION
 
 virt-rescue gives you a rescue shell and some simple recovery tools
@@ -53,12 +63,6 @@ eg:
  # mount /dev/vg_f11x64/lv_root /sysroot
  # ls /sysroot
 
-B<Note> that the virtual machine must not be powered on when you use
-this tool.  Doing so will probably result in disk corruption in the
-VM.  However if you use the I<--ro> (read only) option, then you can
-attach a shell to a running machine, but the results might be strange
-or inconsistent.
-
 This tool is just designed for quick interactive hacking on a virtual
 machine.  For more structured access to a virtual machine disk image,
 you should use L<guestfs(3)>.  To get a structured shell, use
-- 
1.6.5.rc2


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