GNU bug report logs - #80093
libparted: gpt: Partition type is not updated after changing file system

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Pascal Hambourg <pascal <at> plouf.fr.eu.org>
To: bug-parted <at> gnu.org
Subject: libparted: gpt: Partition type is not updated after changing file
 system
Date: Mon, 29 Dec 2025 14:03:19 +0100

Package: parted
Version: 3.6
Severity: minor

Dear maintainer,

In a GPT partition table, when the file system type of a partition is 
set to a Microsoft filesystem (ex: FAT) with ped_partition_set_system(), 
gpt_partition_set_system() sets the partition type to 
PARTITION_BASIC_DATA_GUID (Microsoft basic data partition type GUID), 
resulting in the "msftdata" flag being set. As expected.

However when a partition has the PARTITION_BASIC_DATA_GUID type, if the 
filesystem type is changed to a non-Microsoft filesystem (ex: ext4), 
gpt_partition_set_system() does not reset the partition type to the 
associated partition type GUID (ex: PARTITION_LINUX_DATA_GUID), 
resulting in the "msftdata" flag still being set.

It is the same with the PARTITION_SWAP_GUID partition type.

This is caused by PARTITION_BASIC_DATA_GUID and PARTITION_SWAP_GUID 
being included in skip_set_system_guids[]. Is there a reason for this or 
is it a bug ? Shouldn't all filesystem-specific partition types be 
excluded from this list ?

Message #8 received at 80093 <at> debbugs.gnu.org (full text, mbox):

From: Pascal Hambourg <pascal <at> plouf.fr.eu.org>
To: 80093 <at> debbugs.gnu.org
Subject: Re: libparted: gpt: Partition type is not updated after changing file
 system
Date: Tue, 30 Dec 2025 10:50:45 +0100

Looking at other disk labels, I see that the same issue exists with the 
PARTITION_LINUX_SWAP type in MSDOS.

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