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[augeas-devel] [Augeas] #50: grub lense on Debian



#50: grub lense on Debian
---------------------------------+------------------------------------------
 Reporter:  micah                |       Owner:  lutter
     Type:  defect               |      Status:  new   
 Priority:  minor                |   Milestone:  next  
Component:  Augeas               |     Version:  0.4.1 
 Keywords:  grub, debian, lense  |  
---------------------------------+------------------------------------------
 Debian does something odd with the grub menu.lst that is not very
 standard, as a result it is not surprising that the augeas lense does not
 know how to deal with it. In the menu.lst there is the following:

 {{{
 ### BEGIN AUTOMAGIC KERNELS
 ## lines between the AUTOMAGIC KERNELS LIST markers will be modified
 ## by the debian update-grub script except for the default options below

 ## DO NOT UNCOMMENT THEM, just edit them to your needs
 }}}

 This describes how there are options between these headers which have
 comments preceeding them that are actually parsed by the 'update-grub'
 command which then generates a new menu.lst based on those values. The
 update-grub command is run after every kernel package change, and various
 other packages. The reason that they are commented out (for better or for
 worse) is because if they were not commented out, they would be
 interpreted by grub on boot, which would fail.

 Some examples of these values:

 {{{
 ## ## Start Default Options ##
 ## default kernel options
 ## default kernel options for automagic boot options
 ## If you want special options for specific kernels use kopt_x_y_z
 ## where x.y.z is kernel version. Minor versions can be omitted.
 ## e.g. kopt=root=/dev/hda1 ro
 ##      kopt_2_6_8=root=/dev/hdc1 ro
 ##      kopt_2_6_8_2_686=root=/dev/hdc2 ro
 # kopt=root=/dev/mapper/pond-root ro

 ## default grub root device
 ## e.g. groot=(hd0,0)
 # groot=(hd0,0)

 ...

 ## should update-grub create memtest86 boot option
 ## e.g. memtest86=true
 ##      memtest86=false
 # memtest86=true
 }}}

 As you can see from the snippets included above, I've got the following
 set:

 # kopt=root=/dev/mapper/pond-root ro

 when update-grub is run, it parses that line and creates the kernel lines
 later in the file based on that and what kernels are installed, for
 example it would create the following set, using the kopt line to add to
 the kernel line appropriately:

 {{{
 title           Debian GNU/Linux, kernel 2.6.26-1-vserver-686
 root            (hd0,0)
 kernel          /vmlinuz-2.6.26-1-vserver-686 root=/dev/mapper/pond-root
 ro
 initrd          /initrd.img-2.6.26-1-vserver-686
 }}}

 The section where these automagic values are parsed and turned into these
 kernel stanzas is ended by the following:

 {{{
 ### END DEBIAN AUTOMAGIC KERNELS LIST
 }}}

-- 
Ticket URL: <https://fedorahosted.org/augeas/ticket/50>
Augeas <http://augeas.net/>
a configuration API



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