r2558 actually enabled this code path which was (almost) never executed
before in probe():
if (S_ISREG (st.st_mode))
{
/* Regular file. Verify that we can read it properly. */
grub_file_t file;
grub_util_info ("reading %s via OS facilities", path);
filebuf_via_sys = grub_util_read_image (path);
grub_util_info ("reading %s via GRUB facilities", path);
asprintf (&grub_path, "(%s)%s", drive_name, path);
file = grub_file_open (grub_path);
filebuf_via_grub = xmalloc (file->size);
grub_file_read (file, filebuf_via_grub, file->size);
grub_util_info ("comparing");
if (memcmp (filebuf_via_grub, filebuf_via_sys, file->size))
grub_util_error ("files differ");
}
printf ("%s\n", fs->name);
If /boot is on a seperate partition and you run `grub-probe -t
fs /boot/grub/core.img' grub_file_open returns 0 because grub_path is
the full system path and not a relative path which GRUB needs.
--
Felix Zielcke
Proud Debian Maintainer
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