[SOLVED]Grub recognize Windows 7 as Windows Vista

Question

Hi all.
I just installed Arch on my Thinkpad T420, Everything is ok except Grub recognize Windows 7 as Windows Vista.
I have Windows 7 installed on SSD, on another drive I have 2 NTFS partitions and 1 ext4 partition on which Arch is installed, grub is installed to SSD, both system can boot without problem.
I installed Mint before, it recognizes Windows 7 with no problem.
Can I fix this? I googled this and I think this problem should have been fixed long ago, don't know why the grub os-prober think I have Vista installed, I never installed Vista before.
Last edited by smilinger (2014-12-10 12:57:05)

Answer 1

I think I figured out why. After some digging I found the code in /usr/lib/os-probes/mounted/20microsoft that has a tiny bug.
The problem is the grep options, maybe in other distributions binary files are treated as text by default or something, but apparently in Archlinux it's not, so any OS that's higher than Vista will be recognized as Vista.
Anyway, I pasted the patch here, it's easy to fix.
--- 20microsoft.old 2014-11-04 23:53:28.000000000 +0800
+++ 20microsoft 2014-12-13 21:39:27.471912583 +0800
@@ -31,19 +31,19 @@
for boot in $(item_in_dir boot "$2"); do
bcd=$(item_in_dir bcd "$2/$boot")
if [ -n "$bcd" ]; then
- if grep -qs "W.i.n.d.o.w.s. .8" "$2/$boot/$bcd"; then
+ if grep -aqs "W.i.n.d.o.w.s. .8" "$2/$boot/$bcd"; then
long="Windows 8 (loader)"
- elif grep -qs "W.i.n.d.o.w.s. .7" "$2/$boot/$bcd"; then
+ elif grep -aqs "W.i.n.d.o.w.s. .7" "$2/$boot/$bcd"; then
long="Windows 7 (loader)"
- elif grep -qs "W.i.n.d.o.w.s. .V.i.s.t.a" "$2/$boot/$bcd"; then
+ elif grep -aqs "W.i.n.d.o.w.s. .V.i.s.t.a" "$2/$boot/$bcd"; then
long="Windows Vista (loader)"
- elif grep -qs "W.i.n.d.o.w.s. .S.e.r.v.e.r. .2.0.0.8. .R.2." "$2/$boot/$bcd"; then
+ elif grep -aqs "W.i.n.d.o.w.s. .S.e.r.v.e.r. .2.0.0.8. .R.2." "$2/$boot/$bcd"; then
long="Windows Server 2008 R2 (loader)"
- elif grep -qs "W.i.n.d.o.w.s. .S.e.r.v.e.r. .2.0.0.8." "$2/$boot/$bcd"; then
+ elif grep -aqs "W.i.n.d.o.w.s. .S.e.r.v.e.r. .2.0.0.8." "$2/$boot/$bcd"; then
long="Windows Server 2008 (loader)"
- elif grep -qs "W.i.n.d.o.w.s. .R.e.c.o.v.e.r.y. .E.n.v.i.r.o.n.m.e.n.t" "$2/$boot/$bcd"; then
+ elif grep -aqs "W.i.n.d.o.w.s. .R.e.c.o.v.e.r.y. .E.n.v.i.r.o.n.m.e.n.t" "$2/$boot/$bcd"; then
long="Windows Recovery Environment (loader)"
- elif grep -qs "W.i.n.d.o.w.s. .S.e.t.u.p" "$2/$boot/$bcd"; then
+ elif grep -aqs "W.i.n.d.o.w.s. .S.e.t.u.p" "$2/$boot/$bcd"; then
long="Windows Recovery Environment (loader)"
else
long="Windows Vista (loader)"
Last edited by smilinger (2014-12-13 13:55:04)