cp, mv, install: Can't move a file on compressed Btrfs to tmpfs

[oech3]

$ touch a
$ mv a /tmp/a
mv: Permission denied

I know there many bugs about cross-device move of specialzed files. But I can't believe this was broken for a long time.

[cakebaker]

Hm, I can't reproduce it on my machine (with Arch Linux):

$ touch a
$ cargo run -q mv a /tmp/a
$ ls a
ls: cannot access 'a': No such file or directory
$ ls /tmp/a
/tmp/a

[oech3]

Hmm... I reproduced this also with prebuilt 0.4.0 in Arch. Needs additional condition?

[oech3]

$ chmod 777 a
$ run0 mv a /tmp/a
mv: Permission denied

[oech3]

?!
cp: 'a' -> '/tmp/a': Operation not permitted (os error 1)
install: Failed to remove existing file /tmp/a. Error: Os { code: 1, kind: PermissionDenied, message: "Operation not permitted" } install: cannot install a to /tmp/a

[oech3]

@cakebaker Would you test moving compressed a on Btrfs to /tmp?