Le 30/10/2015 16:25, Andrei Borzenkov a écrit : > 30.10.2015 15:37, Arbiel (gmx) пишет: > >>>> 3) To complement this grub script, I want to write a bash script to >>>> set >>>> a environment variable which the grub script has to reset. grub >>>> seems to >>>> not support save_env to a grubenv file located on a logical volume. Is >>>> it possible to replace the load_env and a save_env commands by >>>> identically named functions which would use these 2 commands with >>>> the -f >>>> parameter (and doing so, would allow for the correct operation of >>>> recordfail) ? >>>> >>> There is no support for writing on top of diskfilter devices - LVM, >>> Linux MD etc. It may be possible to implement limited support for >>> linear and RAID0 type of storage. Anything else is too complicated to >>> warrant doing it. I would be happy if someone could suggest >>> implementation that allowed environment block to be located anywhere, >>> not only as file on a filesystem. openSUSE does something similar for >>> btrfs as special case. My suggestion would be : not really anywhere, but in core.img. I understand this would increase core.img's size by one block, which could be a major drawback for older system. So, the inclusion of the environment block into core.img should be controlled by a "--grubenv-incore" parameter in grub-install. And this parameter could also be discarted if there is not enough available room. grub's load_env and save_env commands, linux grub-install and grub-editenv commands should be the only ones to be modified. If this suggestion fits you, I'm sure you will find a way to assume compatibility with the current situation.
>> My question was maybe not clear enough. I meant in "to replace
>> load_env …"
>> writing in my script sort of an alias to overwrite the commands.
>>
>
> Can you "replace write system call" to write to a file system that is
> mounted read-only?
I do not understand your question. I was refering to something similar
to the bash "builtin" builtin. Bash manual reads :
builtin [shell-builtin [args]]
Run a shell builtin, passing it args, and return its exit status. This
is useful when defining a shell function with the same name as a shell
builtin, retaining the functionality of the builtin within the function.
The return status is non-zero if shell-builtin is not a shell builtin
command.
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