[libvirt] [PATCH][RFC] helper of copy-storage-* features

[li guang]

在 2012-10-18四的 06:52 -0600，Eric Blake写道：
> On 10/17/2012 08:50 PM, Doug Goldstein wrote:
> > On Sun, Oct 14, 2012 at 9:48 PM, liguang <lig.fnst at cn.fujitsu.com> wrote:
> >> help to create disk images copy-storage-* required,
> >> try to do non-shared migration without bothering to
> >> create disk images at target by hand.
> >>
> 
> >> +char *virDirOfFile(const char *file)
> 
> Poor naming.  Better might be virDirName, to match what we are wrapping.
> 
> >> +{
> >> +    char *p, *tmp;
> >> +
> >> +    if (file == NULL)
> >> +        return NULL;
> >> +    if ((tmp = strdup(file)) == NULL)
> >> +        return NULL;
> >> +    if ((p = strrchr(file, '/')) == NULL)
> >> +        return getcwd(tmp, strlen(file));
> >> +    if (strlen(p) == 0)
> >> +        return NULL;
> >> +    tmp[strlen(file) - strlen(p)] = '\0';
> >> +
> >> +    return tmp;
> >> +}
> > 
> > Eric probably knows better than I do but it seems like we can probably
> > pull in dirname() from gnulib for this rather than implementing our
> > own version.
> 
> 'git grep mdir_name' - we're already using the gnulib interface in two
> places.  It does not handle NULL input, but that would imply you just write:
> 
> char *
> virDirName(const char *file)
> {
>     if (!file)
>         return NULL;
>     return mdir_name(file);
> }
> 
> and let the caller deal with NULL return.  Then again, if the caller is
> going to virReportOOMError(), it may be better to just use mdir_name()
> directly, and guarantee that the caller doesn't pass in NULL in the
> first place.
> 

OK, I'll use mdir_name directly, new patch will come up later.

Thanks!

-- 
liguang    lig.fnst at cn.fujitsu.com
FNST linux kernel team