On Wed 03 Feb 2021 at 11:24:38 (-0500), Greg Wooledge wrote: > On Wed, Feb 03, 2021 at 10:02:42AM -0600, David Wright wrote: > > T'other way, I think, but no matter. For the record, there are > > two different "strengths" for fsck: > > > > fastboot|fsck.mode=skip) > > fastboot=y > > ;; > > forcefsck|fsck.mode=force) > > forcefsck=y > > ;; > > fsckfix|fsck.repair=yes) > > fsckfix=y > > ;; > > fsck.repair=no) > > fsckfix=n > > ;; > > Where is this coming from?
>From foo/main/init where foo is $ unmkinitramfs /boot/initrd.img foo/ > > If you have a separate /boot that is not on a filesystem needing > > fscking, then you can use the normal mechanism supported by grub¹. > > > ¹ It writes to the file /boot/grub/grubenv, hence the caution. > > What is the "normal mechanism"? Where is it documented? https://www.gnu.org/software/grub/manual/grub/grub.html > There are no man pages for "grub" or for "grubenv" on my system. > There is a /boot/grub/grubenv file but it consists of one comment line, > ending in a newline, and then enough # characters to make the file size > exactly 1024 bytes. Incomprehensible. I'm guessing the comment is a signature. §15.2 outlines the grubenv method. As Stefan mentioned, grubenv is designed to remain static, and grub-editenv carefully alters its contents. Configuring Grub uses /etc/grub.d/00_header and the variables in /etc/default/grub to write the code at the top of /boot/grub/grub.cfg for juggling the boot selection. You start all this off by editing /etc/default/grub: GRUB_DEFAULT=0 → GRUB_DEFAULT=saved and running grub-set-default 0. Then: $ head -c 72 /boot/grub/grubenv ; echo # GRUB Environment Block saved_entry=0 ################################# $ # grub-reboot 'fsck>fsck' # $ head -c 72 /boot/grub/grubenv ; echo # GRUB Environment Block saved_entry=0 next_entry=fsck>fsck ############ $ I'm doing the next bit now to restore normality, but this would also be done automatically if you boot with a next_entry set, so that the altered boot is a one-off. # grub-set-default 0 # $ head -c 72 /boot/grub/grubenv ; echo # GRUB Environment Block saved_entry=0 ################################# $ Cheers, David.
