Description of problem:

When using yum with the --installroot option, and a kernel is being installed, grubby fails to create an entry in /etc/grub.conf. It fails with the follwoing error: "grubby fatal error: unable to find a suitable template" 


Version-Release number of selected component (if applicable):



How reproducible:
Always


Steps to Reproduce:
1.How we create "/a":

lvcreate -n root2 -L 4G rpool
lvcreate -n var2 -L 2G rpool
mkfs -t ext3 /dev/rpool/root2
mkfs -t ext3 /dev/rpool/var2
mkdir /a
mount /dev/rpool/root2 /a
cp -ax / /a
mount /dev/rpool/var2 /a/var/
cp -ax /var /a
chroot /a
mount /proc
mount /sys
exit
mount --bind /dev /a/dev
mount --bind /boot /a/boot

2.
"yum --installroot=/a upgrade" fails to populate /etc/grub.conf

  
Actual results:

kernel is being installed, grubby fails to create an entry in /etc/grub.conf. It fails with the follwoing error: "grubby fatal error: unable to find a suitable template" 

Expected results:

grub.conf should be automatically populated with the related kernel entries


Additional info:

Grubby upstream has changed the method to determine which device is root and which device the kernel is on.
Compiling grubby from upstream (fedora git repo), and installing, replacing grubby in RHEL5 does succeed and ends up with an entry in /etc/grub.conf but does not reflect the root as provided by "--installroot", but instead the original root device.

This is the code that is goinging wrong in grubby.c:
dev = nashGetPathBySpec(_nash_context, dev);
if (!dev)
return 0;

i = stat(dev, &sb);
if (i)
return 0;

stat("/", &sb2);

if (sb.st_rdev != sb2.st_dev)
return 0;

return 1;

Grubby in fedora, changes to using UUIDs:
dev = getpathbyspec(dev);
if (!dev)
return 0;

rootdev = findDiskForRoot();
if (!rootdev)
return 0;

if (!getuuidbydev(rootdev) || !getuuidbydev(dev)) {
free(rootdev);
return 0;
}

if (strcmp(getuuidbydev(rootdev), getuuidbydev(dev))) {
free(rootdev);
return 0;
}

free(rootdev);

return 1;

Ultimately grubby, rpm, yum needs to be aware of the change of root and cope with this automatically.