Colin Watson and my suspicions about search behavior is right:
search does NOT change variable "root" if the device was not found.
But there is a lack of clear wordings of that fact in
grub> help search
text.
So, I changed this bug to NEW again, hoping documentation strings will get
clearer....
** Changed in: grub2 (Ubuntu)
Status: Won't Fix => New
** Description changed:
Binary package hint: grub2
Such an entry:
--------------
- menuentry "Ubuntu, mit Linux 2.6.32-17-generic" --class ubuntu --class
gnu-linux --class gnu --class os {
- recordfail
- insmod ext2
- set root='(/dev/sda,3)'
- search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
- linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash nvidia.modeset=1
- initrd /boot/initrd.img-2.6.32-17-generic
- }
+ menuentry "Ubuntu" --class ubuntu --class gnu-linux --class gnu --class os {
+ recordfail
+ insmod ext2
+ set root='(/dev/sda,3)'
+ search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
+ linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash nvidia.modeset=1
+ initrd /boot/initrd.img-2.6.32-17-generic
+ }
------------
is unneeded complicated. Ubuntu should deliver this output (of upgrade-grub)
instead:
--------------
- menuentry "Ubuntu, mit Linux 2.6.32-17-generic" --class ubuntu --class
gnu-linux --class gnu --class os {
- recordfail
- insmod ext2
- # set root='(/dev/sda,3)'
+ menuentry "Ubuntu" --class ubuntu --class gnu-linux --class gnu --class os {
+ recordfail
+ insmod ext2
+ # set root='(/dev/sda,3)'
# we can comment out "set root" as search will take over setting root
- search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
- linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash nvidia.modeset=1
- initrd /boot/initrd.img-2.6.32-17-generic
- }
+ search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
+ linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash nvidia.modeset=1
+ initrd /boot/initrd.img-2.6.32-17-generic
+ }
------------
- The only reason to "set root" should be, if command "search" has a feature
+ The only reason to "set root" should be, if command "search" has a feature
to NOT manipulate the "root" variable if it fails to find the searched
partition.
** Description changed:
Binary package hint: grub2
Such an entry:
--------------
menuentry "Ubuntu" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(/dev/sda,3)'
search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
- linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash nvidia.modeset=1
+ linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash
initrd /boot/initrd.img-2.6.32-17-generic
}
------------
is unneeded complicated. Ubuntu should deliver this output (of upgrade-grub)
instead:
--------------
menuentry "Ubuntu" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
# set root='(/dev/sda,3)'
# we can comment out "set root" as search will take over setting root
search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash nvidia.modeset=1
initrd /boot/initrd.img-2.6.32-17-generic
}
------------
The only reason to "set root" should be, if command "search" has a feature
to NOT manipulate the "root" variable if it fails to find the searched
partition.
** Description changed:
Binary package hint: grub2
Such an entry:
--------------
menuentry "Ubuntu" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(/dev/sda,3)'
search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash
initrd /boot/initrd.img-2.6.32-17-generic
}
------------
is unneeded complicated. Ubuntu should deliver this output (of upgrade-grub)
instead:
--------------
menuentry "Ubuntu" --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
# set root='(/dev/sda,3)'
# we can comment out "set root" as search will take over setting root
search --no-floppy --fs-uuid --set
67f844a5-1afd-4265-932f-e57e078c0fdc
- linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash nvidia.modeset=1
+ linux /boot/vmlinuz-2.6.32-17-generic root=/dev/sda3 ro quiet
noresume splash
initrd /boot/initrd.img-2.6.32-17-generic
}
------------
The only reason to "set root" should be, if command "search" has a feature
to NOT manipulate the "root" variable if it fails to find the searched
partition.
--
comment out _set_root_ in grub.cfg
https://bugs.launchpad.net/bugs/549227
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