URL:
<http://savannah.gnu.org/bugs/?50702>
Summary: grub2-mkconfig very slow
Project: GNU GRUB
Submitted by: pascom
Submitted on: Sun 02 Apr 2017 08:25:42 AM UTC
Category: Configuration
Severity: Major
Priority: 5 - Normal
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name: Pascal COMBES
Originator Email: [email protected]
Open/Closed: Open
Discussion Lock: Any
Release:
Release: 2.02~beta1
Reproducibility: Every Time
Planned Release: None
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Details:
I noticed that upgrading the kernel is very long on my PC (>2min on Intel Core
i7-4800MQ). I investigated and found that grub2-mkconfig took so much time.
Deepening the analysis showed that it was in fact Linux system detection
(90linux-distro) by os-prober bash scripts on an unmounted LVM partition with
an ext4 (detected as ext2 by grub2-mount) filesystem (with lib folder in the
root but I guess the same problem occurs when the partition contains a real
undetected linux-distro).
I finally found out that the problem comes from ls taking very long on the lib
folder of the grub2 mounted filesystem. I do not know if it is a FUSE problem
or a grub2 problem.
My version of gurb2 is 2.02-beta2 (OpensSUSE Leap 42.2)
I think that you will reproduce the problem by:
-Formatting in ext4 an LVM logical volume.
-Putting there a /lib folder with a lot of files and folders (mine has 264
files and folders)
-Unmounting it
-Running os-prober (or grub2-mkconfig with os-probing enabled)
To solve temporarily the problem on my system, I added the (reasonable?)
condition that a linux root filesystem must contain a /usr and a /var folder
(see atttached file), which bypasses the ls check. This will not be sufficient
on a system with a real unknown linux distro.
If you need some help do not hesitate to contact me.
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File Attachments:
-------------------------------------------------------
Date: Sun 02 Apr 2017 08:25:42 AM UTC Name: 90linux-distro Size: 5kB By:
pascom
<http://savannah.gnu.org/bugs/download.php?file_id=40231>
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