Package: grub-common Version: 2.02+dfsg1-10 Severity: wishlist Currently grub does not allow you to set Linux boot arguments that apply *only* to the "recovery" mode set in /etc/grub.d/10_linux. Instead, options that you set in GRUB_CMDLINE_LINUX in /etc/default/grub get applied both to recovery modes and prepended to GRUB_CMDLINE_LINUX_DEFAULT for the default boot option. In the process of working on a method to boot from an OpenPGP smartcard (recent support added to cryptsetup-initramfs) I ran into this issue as I needed to override the default /etc/crypttab options with the cryptopts kernel argument in the case a user loses their OpenPGP smartcard and needs to revert to a LUKS passphrase in recovery mode.
Implementing the ability to set kernel command line arguments that only apply during recovery mode would require changes to changes to 3 total lines, one to export the existing GRUB_CMDLINE_LINUX_RECOVERY variable so it can be used in /etc/default/grub: /usr/sbin/grub-mkconfig line 222: GRUB_CMDLINE_LINUX_DEFAULT \ becomes GRUB_CMDLINE_LINUX_DEFAULT \ GRUB_CMDLINE_LINUX_RECOVERY \ And two changes that use variable, if set, instead of overwriting it: /etc/grub.d/10_linux line 91: GRUB_CMDLINE_LINUX_RECOVERY=recovery becomes GRUB_CMDLINE_LINUX_RECOVERY="$GRUB_CMDLINE_LINUX_RECOVERY recovery" /etc/grub.d/10_linux line 93: GRUB_CMDLINE_LINUX_RECOVERY=single becomes GRUB_CMDLINE_LINUX_RECOVERY="$GRUB_CMDLINE_LINUX_RECOVERY single" This change shouldn't have any negative impact on existing users if they don't set the variable, apart from adding a space to their kernel command line for the recovery boot options. -- Kyle Rankin
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