On 04.09.2014 17:36, Peter Jones wrote:
> This lets us make /boot/grub2/grubenv a symlink to
> /boot/efi/EFI/fedora/grubenv even though they're different mount points,
> which allows /usr/bin/grub2-editenv to be the same across platforms
> (i.e. UEFI vs BIOS).
>
> Signed-off-by: Peter Jones <pjo...@redhat.com>
> Reviewed-by: Adam Jackson <a...@redhat.com>
> ---
> Makefile.util.def | 9 +++++++++
> util/editenv.c | 46 ++++++++++++++++++++++++++++++++++++++++++++--
> 2 files changed, 53 insertions(+), 2 deletions(-)
>
> diff --git a/Makefile.util.def b/Makefile.util.def
> index 8f40e78..87029a1 100644
> --- a/Makefile.util.def
> +++ b/Makefile.util.def
> @@ -228,8 +228,17 @@ program = {
>
> common = util/grub-editenv.c;
> common = util/editenv.c;
> + common = util/grub-install-common.c;
> common = grub-core/osdep/init.c;
> + common = grub-core/osdep/compress.c;
> + extra_dist = grub-core/osdep/unix/compress.c;
> + extra_dist = grub-core/osdep/basic/compress.c;
> + common = util/mkimage.c;
> + common = grub-core/osdep/config.c;
> + common = util/config.c;
> + common = util/resolve.c;
>
> + ldadd = '$(LIBLZMA)';
> ldadd = libgrubmods.a;
> ldadd = libgrubgcry.a;
> ldadd = libgrubkern.a;
> diff --git a/util/editenv.c b/util/editenv.c
> index c6f8d22..d8d1dad 100644
> --- a/util/editenv.c
> +++ b/util/editenv.c
> @@ -37,6 +37,7 @@ grub_util_create_envblk_file (const char *name)
> FILE *fp;
> char *buf;
> char *namenew;
> + char *rename_target = xstrdup(name);
>
> buf = xmalloc (DEFAULT_ENVBLK_SIZE);
>
> @@ -59,7 +60,48 @@ grub_util_create_envblk_file (const char *name)
> free (buf);
> fclose (fp);
>
> - if (grub_util_rename (namenew, name) < 0)
> - grub_util_error (_("cannot rename the file %s to %s"), namenew, name);
> + ssize_t size = 1;
> + while (1)
> + {
> + char *linkbuf;
> + ssize_t retsize;
> +
> + linkbuf = xmalloc(size+1);
> + retsize = grub_util_readlink (rename_target, linkbuf, size);
If I get this code correctly you essentially canonicalize the link
manually. Why not use already available canonicalization functions?
> + if (retsize < 0 && (errno == ENOENT || errno == EINVAL))
> + {
> + free (linkbuf);
> + break;
> + }
> + else if (retsize < 0)
> + {
> + grub_util_error (_("cannot rename the file %s to %s: %m"), namenew,
> name);
> + free (linkbuf);
> + free (namenew);
> + return;
> + }
> + else if (retsize == size)
> + {
> + free(linkbuf);
> + size += 128;
> + continue;
> + }
> +
> + free (rename_target);
> + linkbuf[retsize] = '\0';
> + rename_target = linkbuf;
> + }
> +
> + int rc = grub_util_rename (namenew, rename_target);
> + if (rc < 0 && errno == EXDEV)
> + {
> + rc = grub_install_copy_file (namenew, rename_target, 1);
> + grub_util_unlink (namenew);
> + }
> +
> + if (rc < 0)
> + grub_util_error (_("cannot rename the file %s to %s: %m"), namenew,
> name);
> +
> free (namenew);
> + free (rename_target);
> }
>
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