Bug 447200

Summary: Shows 0 bytes on apfs-fuse filesystem
Product: [Applications] filelight Reporter: dhoenig
Component: generalAssignee: Martin Sandsmark <martin.sandsmark>
Status: RESOLVED UPSTREAM    
Severity: normal CC: sitter
Priority: NOR    
Version First Reported In: 21.12.0   
Target Milestone: ---   
Platform: Manjaro   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description dhoenig 2021-12-18 19:14:32 UTC 
SUMMARY
***
Analysis of a mounted apfs filesystem via apfs-fuse shows 0 bytes although there is a lot of space allocated by files.
***

The Krusader file system analysis (alt-shift-S) does correctly show the content.
Local paths work fine, too.

STEPS TO REPRODUCE
1. Mount apfs FS via
apfs-fuse -o allow_other /dev/nvme0n1p2 /run/media/MacOS
2.  Start Filelight and have it analyse starting from /run/media/MacOS
3. wait until its finished and check what it found 

OBSERVED RESULT
It says it found 0 bytes only. At the same time, when hovering over the empty circle, it says "3.000.000 files 100%", so it does see the content.

EXPECTED RESULT
The Krusader analysis says something about 900GB, this is expected.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: ?
KDE Plasma Version: 5.23.4
KDE Frameworks Version: 5.89.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
manjaro 21.2rc-1 (testing branch)
Comment 1 Harald Sitter 2022-04-25 22:10:17 UTC 
This is kind of a bug in apfs-fuse as it claims that files occupy no blocks. Since filelight presents block usage (that is effective use on-disk) rather than byte usage (that is theoretical size of the file in bytes). You'll probably see the same result with most proper space usage analyzers. e.g. I know for a fact that the terminal program `ncdu` also would fall into this trap.
Best report it to the authors of apfs-fuse.

stat iTunes.app/Contents/Info.plist                                                                                         
  File: iTunes.app/Contents/Info.plist
  Size: 6809            Blocks: 0          IO Block: 4096   regular file
Device: 67h/103d        Inode: 12885004098  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2019-03-07 07:41:48.000000000 +0100
Modify: 2019-03-07 07:41:48.000000000 +0100
Change: 2020-01-29 12:13:15.683020291 +0100
 Birth: -