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util: Detect more I/O errors

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Many of GRUB's utilities don't check anywhere near all the possible
write errors.  For example, if grub-install runs out of space when
copying a file, it won't notice.  There were missing checks for the
return values of write, fflush, fsync, and close (or the equivalents on
other OSes), all of which must be checked.

I tried to be consistent with the existing logging practices of the
various hostdisk implementations, but they weren't entirely consistent
to start with so I used my judgement.  The result at least looks
reasonable on GNU/Linux when I provoke a write error:

  Installing for x86_64-efi platform.
  grub-install: error: cannot copy `/usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed' to `/boot/efi/EFI/debian/grubx64.efi': No space left on device.

There are more missing checks in other utilities, but this should fix
the most critical ones.

Fixes Debian bug #922741.

Signed-off-by: Colin Watson <cjwatson@ubuntu.com>
Reviewed-by: Steve McIntyre <93sam@debian.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Colin Watson 2019-02-27 09:10:08 +00:00 • committed by Daniel Kiper
parent 222cb8f6df
commit 62daa27056
10 changed files with 90 additions and 45 deletions
Download patch file Download diff file Expand all files Collapse all files

18
grub-core/osdep/unix/hostdisk.c
View file

@ -177,20 +177,22 @@ grub_util_fd_strerror (void)
static int allow_fd_syncs = 1;
void
int
grub_util_fd_sync (grub_util_fd_t fd)
{
if (allow_fd_syncs)
fsync (fd);
return fsync (fd);
return 0;
}
void
int
grub_util_file_sync (FILE *f)
{
fflush (f);
if (fflush (f) != 0)
return -1;
if (!allow_fd_syncs)
return;
fsync (fileno (f));
return 0;
return fsync (fileno (f));
}
void
@ -199,10 +201,10 @@ grub_util_disable_fd_syncs (void)
allow_fd_syncs = 0;
}
void
int
grub_util_fd_close (grub_util_fd_t fd)
{
close (fd);
return close (fd);
}
char *