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Discrepancy between df and duf on macOS #205

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sryze opened this issue Oct 16, 2022 · 3 comments · May be fixed by #208
Open

Discrepancy between df and duf on macOS #205

sryze opened this issue Oct 16, 2022 · 3 comments · May be fixed by #208

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@sryze
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sryze commented Oct 16, 2022 •
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When I run duf on a MacBook (macOS 12.6, APFS) it shows different info for some of the system volumes compared to the info printed by df, e.g. "Used" space of /System/Volumes/Preboot and /System/Volumes/VM .

df output:

Screen Shot 2022-10-16 at 19 37 53

duf:

Screen Shot 2022-10-16 at 19 37 46
@Lan-ce-lot
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Lan-ce-lot commented Oct 20, 2022 •
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I found the same problem on my MacBook(macOS 12.51, APFS) too.

df -h
截屏2022-10-20 21 07 52
duf
截屏2022-10-20 21 08 13

In the df, Used+Avail ≤ Size
But in the duf, Used+Avail == Size
So the df might be the problem?

@sryze
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sryze commented Oct 21, 2022

As far as I understand, the free space of an APFS container is shared between all volumes of that container and can be allocated to them on demand, therefore used + available space will not be equal to total size for its volumes.

@sryze
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sryze commented Oct 21, 2022 •
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I found that the information about a volume's used space is provided by the getattrlist() system call, but it's not implemented in Go yet. This is what df uses internally for the "Used" column.

@sryze sryze linked a pull request Oct 23, 2022 that will close this issue
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Implement querying of used space for APFS volumes on macOS sryze/duf
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@sryze @Lan-ce-lot