bugGNU GRUB - Bugs: bug #60805, 'grub-install -v' can report an...


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bug #60805: 'grub-install -v' can report an unusable grub-mkimage command

Submitter:  Corey Hickey <bugfood>
Submitted:  Sun 20 Jun 2021 07:49:49 PM UTC
Category:  User Interface Severity:  Major
Priority:  5 - Normal Item Group:  None
Status:  None Privacy:  Public
Assigned to:  None Originator Name: 
Open/Closed:  Open Release:  Git master
Release:  Reproducibility:  Every Time
Planned Release:  None

Sun 20 Jun 2021 07:49:49 PM UTC, original submission:  

Note: I am reporting this based on the Debian package version 2.04-19, but the relevant code appears present in upstream git.

If I run a verbose-grub-install, that reports a grub-mkimage command:

$ sudo grub-install -v /dev/sda 2>&1 | grep grub-mkimage
grub-install: info: grub-mkimage --directory '/usr/lib/grub/i386-pc' --prefix '(mduuid/90aa34c17bd7b3502690763c289ebaf1)/boot/grub' --output '/boot/grub/i386-pc/core.img'  --dtb '' --sbat '' --format 'i386-pc' --compression 'auto'  'ext2' 'part_msdos' 'part_msdos' 'diskfilter' 'mdraid1x' 'biosdisk'

...yet that command cannot be run:

$ sudo grub-mkimage --directory '/usr/lib/grub/i386-pc' --prefix '(mduuid/90aa34c17bd7b3502690763c289ebaf1)/boot/grub' --output '/boot/grub/i386-pc/core.img'  --dtb '' --sbat '' --format 'i386-pc' --compression 'auto'  'ext2' 'part_msdos' 'part_msdos' 'diskfilter' 'mdraid1x' 'biosdisk'
grub-mkimage: error: cannot open `': No such file or directory.

The problem is the "--dtb ''" and "--sbat ''" parts. When grub-install runs, it calls grub_install_generate_image() directly and passes NULL pointers for those options, yet when grub-mkimage is run from the command line, those options are pointers to empty strings. grub_install_generate_image() checks for NULL pointers, but not for empty strings.

I do not know the best solution; either grub-install should omit those options when they are unset or grub-mkimage should accept them and consider empty strings to mean "disabled".


Corey Hickey <bugfood>


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