su
tune2fs -L sexy /dev/sda1
tune2fs -l /dev/sda1 | grep sexy
Filesystem volume name:   sexy

Package: grub-common
Version: 1.98~20100115-1
Severity: wishlist
Tags: patch



Patch for /etc/grub.d/10_linux,
so you can use LABEL beside UUID and devices.

Activation in /etc/default/grub with:
## MUST BE COMMENTED OUT!!! fails if uncommented!
# GRUB_DISABLE_LINUX_UUID=true
GRUB_ENABLE_LINUX_LABEL=true

Thanks
christian


-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-trunk-686 (SMP w/1 CPU core)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages grub-common depends on:
ii  base-files              5.0.0            Debian base system miscellaneous f
ii  dpkg                    1.15.5.6         Debian package management system
ii  gettext-base            0.17-8           GNU Internationalization utilities
ii  install-info            4.13a.dfsg.1-5   Manage installed documentation in
ii  libc6                   2.10.2-2         GNU C Library: Shared libraries
ii  libfreetype6            2.3.11-1         FreeType 2 font engine, shared lib
ii  zlib1g                  1:1.2.3.4.dfsg-3 compression library - runtime

Versions of packages grub-common recommends:
pn  os-prober                     <none>     (no description available)

Versions of packages grub-common suggests:
pn  grub-emu                      <none>     (no description available)
pn  multiboot-doc                 <none>     (no description available)

-- no debconf information

--- 10_linux   2010-07-12 13:10:04.000000000 +0200
+++ 10_linux_+label   2010-08-18 09:17:33.816200799 +0200
@@ -49,6 +49,12 @@
 LINUX_ROOT_DEVICE=${GRUB_DEVICE}
 else
 LINUX_ROOT_DEVICE=UUID=${GRUB_DEVICE_UUID}
+  GRUB_DEVICE_LABEL="$(blkid -l -t UUID=${GRUB_DEVICE_UUID} -s LABEL -o value)"
+  . /etc/default/grub
+    if [ "x${GRUB_ENABLE_LINUX_LABEL}" = "xtrue" ] \
+    && test -e "/dev/disk/by-label/${GRUB_DEVICE_LABEL}" ; then
+      LINUX_ROOT_DEVICE=LABEL=${GRUB_DEVICE_LABEL}
+    fi
 fi

## note this:
 - it moved after the setting of LINUX_ROOT_DEVICE=UUID=...., the previous was not correct.
 - it sources /etc/default/grub for reading the Value of my Variable GRUB_ENABLE_LINUX_LABEL,
 because that is no Variable in /usr/sbin/update-grub (maybe it will be?).

Also 20_linux_xen can be patched with this.


Activation in /etc/default/grub with:
#GRUB_DISABLE_LINUX_UUID=true (not disable the LINUX_UUID!)
GRUB_ENABLE_LINUX_LABEL=true

if fs_uuid="`${grub_probe} --device ${device} --target=fs_uuid 2> /dev/null`" ; then
    echo "search --no-floppy --fs-uuid --set ${fs_uuid}"
  fi

if label="`${grub_probe} --device ${device} --target=fs_label 2> /dev/null`" ; then
    echo "search --no-floppy --label --set=root ${label}"
  elif fs_uuid="`${grub_probe} --device ${device} --target=fs_uuid 2> /dev/null`" ; then
    echo "search --no-floppy --fs-uuid --set=root ${fs_uuid}"
  fi

menuentry 'Debian GNU/Linux, with Linux 2.6.32-trunk-686' --class debian --class gnu-linux --class gnu --class os {
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos2)'
   search --no-floppy --label --set=root main-root-1
   echo   'Loading Linux 2.6.32-trunk-686 ...'
   linux   /boot/vmlinuz-2.6.32-trunk-686 root=LABEL=main-root-1 ro ramdisk_size=100000 lang=us apm=power-off nomce vga=0x317 acpi_enforce_resources=lax quiet
   echo   'Loading initial ramdisk ...'
   initrd   /boot/initrd.img-2.6.32-trunk-686
}

1. changed /etc/defaults/grub
uncommented this line and used quotes around true:
Code:

GRUB_DISABLE_LINUX_UUID="true"

2. changed /etc/grub.d/10_linux as follows:
Code:

auto_label="`e2label ${GRUB_DEVICE_BOOT} 2>/dev/null`"
  linux_root_device_thisversion="LABEL=${auto_label}"
  cat << EOF
    linux    ${rel_dirname}/${basename} root=${linux_root_device_thisversion} ro ${args}
EOF

3. changed /usr/lib/grub/grub-mkconfig_lib as follows. I know this code could be improved by including it in a proper conditional, but I didn't know how to do that. So it just executes always.
Code:

  # If there's a filesystem UUID that GRUB is capable of identifying, use it;
  # otherwise set root as per value in device.map.
  echo "set root='`${grub_probe} --device ${device} --target=drive`'"
  #if fs_label="`${grub_probe} --device ${device} --target=fs_uuid 2> /dev/null`" ; then
    #echo "search --no-floppy --fs-uuid --set ${fs_uuid}"
  #fi
auto_label="`e2label ${device} 2>/dev/null`"
echo "search --no-floppy --label ${auto_label} --set root"

if label="`${grub_probe} --device ${device} --target=fs_label 2> /dev/null`" ; then
    echo "search --no-floppy --label --set ${label}"
  elif fs_uuid="`${grub_probe} --device ${device} --target=fs_uuid 2> /dev/null`" ; then
    echo "search --no-floppy --fs-uuid --set ${fs_uuid}"
  fi

Those changes generate perfect (as far as I'm concerned) stanzas in grub.cfg. And my test machine boots as expected.

Code:

menuentry "Linux Mint 9, 2.6.32-21-generic (/dev/sda1) -- recovery mode" --class linuxmint --class gnu-linux --class gnu --class os {
    recordfail
    insmod ext2
    set root='(hd0,1)'
    search --no-floppy --label my_label --set root
    echo    'Loading Linux 2.6.32-21-generic ...'
    linux    /boot/vmlinuz-2.6.32-21-generic root=LABEL=my_label ro single
    echo    'Loading initial ramdisk ...'
    initrd    /boot/initrd.img-2.6.32-21-generic
}