On Fri, Mar 12, 2010 at 09:50:01AM -0700, Eric Blake wrote:
> Common Unix practice is to prefer VISUAL over EDITOR, particularly if
> the editor of choice spawns a new window. Thus, it is also common to
> see settings like EDITOR='emacs -nw', with the expectation that the
> shell will parse this as an argument to 'emacs' and not try to invoke
> a file containing a space.
>
> If a user puts junk in EDITOR, they deserve what they get (much more
> than virsh will misbehave); furthermore, sudo scrubs EDITOR by
> default. So the blind use of metacharacters in EDITOR should not be
> considered too much of a security issue.
>
> * tools/virsh.c (editFile): Prefer VISUAL over EDITOR. Don't
> reject shell metacharacters in EDITOR.
> * tools/virsh.pod (edit, net-edit, ENVIRONMENT): Document VISUAL.
> ---
> tools/virsh.c | 19 ++++++++-----------
> tools/virsh.pod | 15 ++++++++++-----
> 2 files changed, 18 insertions(+), 16 deletions(-)
>
> diff --git a/tools/virsh.c b/tools/virsh.c
> index aa85ee6..9f3b197 100644
> --- a/tools/virsh.c
> +++ b/tools/virsh.c
> @@ -7381,20 +7381,17 @@ editFile (vshControl *ctl, const char *filename)
> char *command;
> int command_ret;
>
> - editor = getenv ("EDITOR");
> + editor = getenv ("VISUAL");
> + if (!editor) editor = getenv ("EDITOR");
> if (!editor) editor = "vi"; /* could be cruel & default to ed(1) here */
>
> - /* Check the editor doesn't contain shell meta-characters, and if
> - * it does, refuse to run.
> + /* Check that filename doesn't contain shell meta-characters, and
> + * if it does, refuse to run. Follow the Unix conventions for
> + * EDITOR: the user can intentionally specify command options, so
> + * we don't protect any shell metacharacters there. Lots more
> + * than virsh will misbehave if EDITOR has bogus contents (which
> + * is why sudo scrubs it by default).
> */
> - if (strspn (editor, ACCEPTED_CHARS) != strlen (editor)) {
> - vshError(ctl,
> - _("%s: $EDITOR environment variable contains shell meta or "
> - "other unacceptable characters"),
> - editor);
> - return -1;
> - }
> - /* Same for the filename. */
> if (strspn (filename, ACCEPTED_CHARS) != strlen (filename)) {
> vshError(ctl,
> _("%s: temporary filename contains shell meta or other "
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index 302de18..3707916 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
> @@ -332,8 +332,8 @@ This is equivalent to:
> virsh define domain.xml
> except that it does some error checking.
>
> -The editor used can be supplied by the C<$EDITOR> environment
> -variable, or if that is not defined defaults to C<vi>.
> +The editor used can be supplied by the C<$VISUAL> or C<$EDITOR> environment
> +variables, and defaults to C<vi>.
>
> =item B<migrate> optional I<--live> I<--suspend> I<domain-id> I<desturi> I<migrateuri>
>
> @@ -557,8 +557,8 @@ This is equivalent to:
> virsh define network.xml
> except that it does some error checking.
>
> -The editor used can be supplied by the C<$EDITOR> environment
> -variable, or if that is not defined defaults to C<vi>.
> +The editor used can be supplied by the C<$VISUAL> or C<$EDITOR> environment
> +variables, and defaults to C<vi>.
>
> =item B<net-list> optional I<--inactive> or I<--all>
>
> @@ -639,10 +639,15 @@ of C<virsh>
> The hypervisor to connect to by default. Set this to a URI, in the same
> format as accepted by the B<connect> option.
>
> -=item EDITOR
> +=item VISUAL
>
> The editor to use by the B<edit> and B<net-edit> options.
>
> +=item EDITOR
> +
> +The editor to use by the B<edit> and B<net-edit> options, if C<VISUAL>
> +is not set.
> +
> =item LIBVIRT_DEBUG=LEVEL
>
> Turn on verbose debugging of all libvirt API calls. Valid levels are
> --
ACK
This fixes this bug too https://bugzilla.redhat.com/show_bug.cgi?id=487738
Regards,
Daniel
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