* How to determine the supported file systems for (uuid ...)?
@ 2024-01-19 6:03 Rodrigo Morales
2024-01-31 16:04 ` Felix Lechner via
0 siblings, 1 reply; 2+ messages in thread
From: Rodrigo Morales @ 2024-01-19 6:03 UTC (permalink / raw)
To: help-guix
In this thread [1], a user reports a problem when finding a partition by
its UUID in Guix. Another user answered the following:
#+BEGIN_QUOTE
The code responsible for that is in (gnu build file-systems). It
currently recognizes only some file system types: ISO9660, ext2/3/4,
Btrfs, FAT32, FAT16, and JFS.
#+END_QUOTE
I confirmed that this is true because (uuid ...) returned the partition
when the file system type was EXT4, but it returned #f when the file
system type was EXFAT.
I was wondering how I could determine the supported file system types
when inspecting the source code at ./gnu/build/file-systems.scm
[2]. Answering this question on my own would have been useful if I
hadn't found the aforementioned thread in the mailing list archive and I
had needed to answer it on the fly.
By inspecting the source code at that file, I noticed a pattern and I
thought that searching all ocurrences of this regular expression could
answer that question:
#+BEGIN_EXAMPLE
^;;;.*file systems
#+END_EXAMPLE
I found these matches.
#+BEGIN_EXAMPLE
10 matches for "^;;;.*file systems" in buffer: file-systems.scm
70:;;; check file systems.
191:;;; Ext2 file systems.
332:;;; Bcachefs file systems.
395:;;; Btrfs file systems.
449:;;; FAT32 file systems.
491:;;; FAT16 file systems.
518:;;; ISO9660 file systems.
578:;;; JFS file systems.
744:;;; NTFS file systems.
786:;;; XFS file systems.
#+END_EXAMPLE
If I use this information for answering my question, then EXT2 is a
supported file system type, but how I could know that EXT3 and EXT4 is
also a supported file system type? Is it because when EXT2 is supported,
then it is highly likely that EXT3 and EXT4 is also supported?
[1] https://mail.gnu.org/archive/html/bug-guix/2020-04/msg00031.html
[2] https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/build/file-systems.scm
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to determine the supported file systems for (uuid ...)?
2024-01-19 6:03 How to determine the supported file systems for (uuid ...)? Rodrigo Morales
@ 2024-01-31 16:04 ` Felix Lechner via
0 siblings, 0 replies; 2+ messages in thread
From: Felix Lechner via @ 2024-01-31 16:04 UTC (permalink / raw)
To: Rodrigo Morales, help-guix
Hi Rodrigo,
On Fri, Jan 19 2024, Rodrigo Morales wrote:
> when EXT2 is supported, then it is highly likely that EXT3 and EXT4 is
> also supported?
Yes, that's because ext3 and ext4 only add better journaling and other
features to what essentially remains ext2 metadata. [1]
Kind regards
Felix
[1] See "backward compatibility,"
https://en.wikipedia.org/wiki/Ext4#Features
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2024-01-19 6:03 How to determine the supported file systems for (uuid ...)? Rodrigo Morales
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