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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
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3
util/editenv.c
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@ -55,7 +55,8 @@ grub_util_create_envblk_file (const char *name)
strerror (errno));
grub_util_file_sync (fp);
if (grub_util_file_sync (fp) < 0)
grub_util_error (_("cannot sync `%s': %s"), namenew, strerror (errno));
free (buf);
fclose (fp);