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Re: [libvirt] Libvirt config converter can't handle file not ending with new line



On Tue, 7 Nov 2017 12:20:05 +0000
Wei Liu <wei liu2 citrix com> wrote:

> On Mon, Nov 06, 2017 at 09:41:01PM -0700, Jim Fehlig wrote:
> > On 10/30/2017 06:17 AM, Wei Liu wrote:  
> > > Hi Jim
> > > 
> > > I discover a problem when using xen_xl converter. When the file in
> > > question doesn't end with a new line, I get the following error:
> > > 
> > >    error: configuration file syntax error: memory conf:53: expecting a value  
> > 
> > I'm not able to reproduce this issue. The libvirt.git tree I tried was a bit
> > dated, but even after updating to latest master I can't reproduce.
> >   
> > > After digging a bit (but haven't read libvirt code), it appears that the
> > > file didn't end with a new line.  
> > 
> > I tried several files without ending new lines, going both directions
> > (domxml-to-native and domxml-from-native), but didn't see the mentioned
> > error. Perhaps your config is revealing another bug which is being
> > improperly reported. Can you provide an example of the problematic config?
> >   
> 
> I tried to get the exact file that caused the problem but it is already
> destroyed by osstest.
> 
> A similar file:
> 
> http://logs.test-lab.xenproject.org/osstest/logs/115436/test-amd64-amd64-libvirt-pair/debian.guest.osstest.cfg
> 
> If you hexdump -C it, you can see the last character is 0a. Remove it and
> feed the file into the converter.
> Wei.

  The phenonomem you point out is indeed weird.  And my first response
  is that this is a bug parsing the cfg input.  I did little explore and
  think that src/util/virconf.c (virConfParseLong(), virConfParseValue()) 
  should be reworked as pointed out in below context diffs.

	<wtenhave nina:140> git diff
	diff --git a/src/util/virconf.c b/src/util/virconf.c
	index 39c2bd917..bc8e57ec3 100644
	--- a/src/util/virconf.c
	+++ b/src/util/virconf.c
	@@ -352,7 +352,7 @@ virConfParseLong(virConfParserCtxtPtr ctxt, long long *val)
	     } else if (CUR == '+') {
	         NEXT;
	     }
	-    if ((ctxt->cur >= ctxt->end) || (!c_isdigit(CUR))) {
	+    if ((ctxt->cur > ctxt->end) || (!c_isdigit(CUR))) {
	         virConfError(ctxt, VIR_ERR_CONF_SYNTAX, _("unterminated number"));
	         return -1;
	     }
	@@ -456,7 +456,7 @@ virConfParseValue(virConfParserCtxtPtr ctxt)
	     long long l = 0;
	 
	     SKIP_BLANKS;
	-    if (ctxt->cur >= ctxt->end) {
	+    if (ctxt->cur > ctxt->end) {
	         virConfError(ctxt, VIR_ERR_CONF_SYNTAX, _("expecting a value"));
	         return NULL;
	     }

  I did not go beyond this yet.

Rgds,
- Wim.


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