[Libguestfs] [PATCH 3/3] daemon: Fix hexdump to work on absolute symbolic links

[Jim Meyering]

Richard W.M. Jones wrote:
...
> Subject: [PATCH 3/3] daemon: Fix hexdump to work on absolute symbolic links (RHBZ#579608).
...

This looks fine.
Glad you caught the s/perror/reply_with_error/ problem
you mentioned in the follow-up comment.

>  char *
>  do_hexdump (const char *path)
>  {
> -  char *buf;
> -  int r;
> +  int fd, flags, r;

I have to say I would find it easier to read/review
if each of these three declarations were moved down to
its point of first use.

>    char *out, *err;
>
> -  buf = sysroot_path (path);
> -  if (!buf) {
> -    reply_with_perror ("malloc");
> +  CHROOT_IN;
> +  fd = open (path, O_RDONLY);
> +  CHROOT_OUT;
> +
> +  if (fd == -1) {
> +    perror (path);
>      return NULL;
>    }
>
> -  r = command (&out, &err, "hexdump", "-C", buf, NULL);
> -  free (buf);
> +  flags = COMMAND_FLAG_CHROOT_COPY_FILE_TO_STDIN | fd;
> +  r = commandf (&out, &err, flags, "hexdump", "-C", NULL);
>    if (r == -1) {
>      reply_with_error ("%s: %s", path, err);
>      free (err);