Bug#1142788: marked as done (os-prober fails to detect Windows Boot Manager under tr_TR.UTF-8 locale)

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Your message dated Thu, 30 Jul 2026 12:48:48 +0000
with message-id <[email protected]>
and subject line Bug#1142788: fixed in os-prober 1.85
has caused the Debian Bug report #1142788,
regarding os-prober fails to detect Windows Boot Manager under tr_TR.UTF-8 =
locale
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact [email protected]
immediately.)


--=20
1142788: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=3D1142788
Debian Bug Tracking System
Contact [email protected] with problems

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Message-ID: <[email protected]>
Date: Sun, 26 Jul 2026 03:23:34 +0300
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To: [email protected]
From: Erol SANER <[email protected]>
Subject: os-prober fails to detect Windows Boot Manager under tr_TR.UTF-8
 locale
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Package: os-prober
Version: 1.83
Severity: normal

Dear Debian os-prober maintainers,

I would like to report what appears to be a locale-dependent bug in
os-prober affecting Windows Boot Manager detection.

System
------

Distribution: Debian 13 (Trixie)
Package: os-prober 1.83
Locale: tr_TR.UTF-8
Boot mode: UEFI
Disk layout:
   - EFI System Partition (FAT32)
   - Windows Boot Manager
   - Debian GNU/Linux

Problem
-------

Running:

     sudo update-grub

does not detect the existing Windows Boot Manager.

The generated GRUB configuration only contains Linux entries.

However, running:

     sudo LC_ALL=C update-grub

correctly reports:

     Found Windows Boot Manager on
     /dev/nvme0n1p2@/EFI/Microsoft/Boot/bootmgfw.efi

and Windows is added to the GRUB menu.

Investigation
-------------

The EFI System Partition was verified to be correct.

The following all succeed:

- EFI partition mounts correctly.
- /boot/efi/EFI exists.
- /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi exists.
- efibootmgr shows Windows Boot Manager.
- The Microsoft probe:

       /usr/lib/os-probes/mounted/efi/20microsoft /boot/efi/EFI

   correctly detects Windows.

Tracing os-prober using:

     sh -x /usr/bin/os-prober

showed that it executes:

     /usr/lib/os-probes/mounted/05efi

Tracing that script further shows that it exits with:

     /boot/efi does not have /EFI directory

even though the directory exists.

The relevant helper function is:

     item_in_dir()

defined in:

     /usr/share/os-prober/common.sh

which performs:

     ls -1 "$2" | grep -i "^$1$"

Additional testing showed:

Under tr_TR.UTF-8:

     ls -1 /boot/efi | grep -i '^efi$'

returns no output.

Under the C locale:

     LC_ALL=C sh -c 'ls -1 /boot/efi | grep -i "^efi$"'

correctly returns:

     EFI

This strongly suggests that the failure is locale-dependent.

Expected behaviour
------------------

Windows Boot Manager should be detected regardless of the user's locale.

Workaround
----------

Running:

     sudo LC_ALL=C update-grub

correctly detects Windows and generates the expected GRUB entry.

Possible cause
--------------

The failure appears to be related to locale-sensitive case-insensitive
matching inside item_in_dir(). The helper should ideally perform the
comparison in a locale-independent manner.

Investigation performed by:

     Erol Saner
     ChatGPT (OpenAI)

Thank you for maintaining Debian and for your time reviewing this report.

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From: Debian FTP Masters <[email protected]>
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To: [email protected]
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Subject: Bug#1142788: fixed in os-prober 1.85
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Source: os-prober
Source-Version: 1.85
Done: Holger Wansing <[email protected]>

We believe that the bug you reported is fixed in the latest version of
os-prober, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Holger Wansing <[email protected]> (supplier of updated os-prober package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Thu, 30 Jul 2026 14:26:34 +0200
Source: os-prober
Architecture: source
Version: 1.85
Distribution: unstable
Urgency: medium
Maintainer: Debian Install System Team <[email protected]>
Changed-By: Holger Wansing <[email protected]>
Closes: 1142788
Changes:
 os-prober (1.85) unstable; urgency=3Dmedium
 .
   * Team upload
 .
   * Make sure, that the grep call for finding /boot/efi/EFI is locale-
     independent (add "LC_ALL=3DC"). Closes: #1142788.
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