[libvirt] [PATCH] Fix enumeration of partitions in disks with a trailing digit in path

[Eric Blake]

On 06/08/2010 11:27 AM, Daniel P. Berrange wrote:
> Disks with a trailing digit in their path (eg /dev/loop0 or
> /dev/dm0) have an extra 'p' appended before the partition
> number (eg, to form /dev/loop0p1 not /dev/loop01). Fix the
> partition lookup to append this extra 'p' when required
> 
> * src/storage/parthelper.c: Add a 'p' before partition
>   number if required
> ---
>  src/storage/parthelper.c |   15 +++++++++++----
>  1 files changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/src/storage/parthelper.c b/src/storage/parthelper.c
> index 5626cd2..28d88c9 100644
> --- a/src/storage/parthelper.c
> +++ b/src/storage/parthelper.c
> @@ -36,6 +36,8 @@
>  #include <stdio.h>
>  #include <string.h>
>  
> +#include "c-ctype.h"
> +
...
>  
> -    if ((dev = ped_device_get(argv[1])) == NULL) {
> -        fprintf(stderr, "unable to access device %s\n", argv[1]);
> +    path = argv[1];
> +    partsep = c_isdigit(path[strlen(path)-1]) ? "p" : "";

If using gcc and -O, this works just fine (c_isdigit is a macro in that
case).  But if you set CFLAGS=-g, with no optimization (or if you don't
use gcc), then this results in a link error:

libvirt_parthelper-parthelper.o: In function `main':
/home/remote/eblake/libvirt/src/storage/parthelper.c:72: undefined
reference to `c_isdigit'

I'm working on a followup patch, because it is (sometimes) necessary to
link in -lgnulib when building parthelper.

-- 
Eric Blake   eblake at redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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