anaconda eats grub

[Richard Hally]

So, I thought I'd try an "upgrade an existing installation" with my new 
FC2 TEST 3 CD's since I had a spare RH9 installed system(dual boot with 
win xp) sitting around. Pretty straight forward, then after the "point 
of no return" the install runs for a while doing things in preparation 
for instaling packages and finds that there isn't enough space to do the 
  upgrade. So, I click OK on the error message box and I'm back to the 
point of no return page of the installer. Then it ctl-alt-del, take the 
  CD out so I can try to boot the old install or failing that, the Win 
XP but low and behold on the BIOS screen (after the usual mem check) at 
the point where it usually show the GRUB menu all it shows is the one 
word "GRUB" at the bottom of the screen and nothing else! Can't boot 
'cause grub has been eaten by anaconda when doing an "Upgrade" installation.
Don't you think this situation (not enough space for an upgrade) should 
be handled a little better? There will probably be many people trying to 
"Upgrade" their FC1 to FC2 and a least a few will not realize how much 
additional space it will take and run into this problem. So, part of the 
question is why is GRUB clobbered in an "Upgrade" install before it 
determines if there is enough space?