[bug #50859] fstype btrfs isn't supported

Follow-up Comment #3, bug #50859 (project findutils):

Hello,

Today tools like "df" are able to display the file system type, but "find"
isn't.

At the same time, "find -fstype btrfs" doesn't seem to work for me even on
btrfs root.

Do you think it would be possible to cherry-pick how "df" does this and do the
same in "find"?

The workaround that Bernhard mentioned back in 2017 sounds like it could work
as well.

I would be happy to test and provide more information if necessary!


$ df --output=fstype,target /mnt/btrfs-root / /etc /.snapshots
Type  Mounted on
btrfs /mnt/btrfs-root
btrfs /
btrfs /
btrfs /.snapshots

$ findmnt -T /mnt/btrfs-root/
TARGET          SOURCE           FSTYPE OPTIONS
/mnt/btrfs-root /dev/mapper/luks btrfs 
rw,noatime,nodiratime,compress=zstd:3,ssd,space_cache,subvolid=5,subvol=/

$ findmnt -T /
TARGET SOURCE                  FSTYPE OPTIONS
/      /dev/mapper/luks[/root] btrfs 
rw,noatime,nodiratime,compress=zstd:3,ssd,space_cache,subvolid=696,subvol=/root

$ findmnt -T /etc
TARGET SOURCE                  FSTYPE OPTIONS
/      /dev/mapper/luks[/root] btrfs 
rw,noatime,nodiratime,compress=zstd:3,ssd,space_cache,subvolid=696,subvol=/root

$ findmnt -T /.snapshots/
TARGET      SOURCE                       FSTYPE OPTIONS
/.snapshots /dev/mapper/luks[/snapshots] btrfs 
rw,noatime,nodiratime,compress=zstd:3,ssd,space_cache,subvolid=261,subvol=/snapshots

$ find /mnt/btrfs-root / /etc /.snapshots -maxdepth 0 -printf '%F\n'
unknown
unknown
unknown
unknown


--
Maxim Baz


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