bug#64785: Package: coreutils Version: 8.32-4+b1 program=mv

[Nir Oren <niro@edev.co>]

*mv: error message "Directory not empty" is confusing *

description: when you try to move a directory to a location already
containing a directory with the same name it would just write "mv: cannot
move 'A' to 'B': Directory not empty"

first, this is technically a wrong error message because there is no
requirement that the destination would be empty.
the destination might as well be populated with some content, we just
require that it would not contain a directory with the same name.

second, the error message is confusing because it doesn't state that the
problem is with the destination. One can think that the problem is actually
with the source, and that the source directory has some kind of attribute
that would require it to be empty prior to moving.

I would suggest to change the error message to: "*a directory with the same
name already exists at destination*"

reproduction:
$:rm -rf /tmp/node_modules
$:mkdir -p proj1/node_modules
$:touch proj1/node_modules/foo
$:mkdir -p proj2/node_modules
$:touch proj2/node_modules/bar
$:mv proj1/node_modules /tmp
$:mv proj2/node_modules /tmp
mv: cannot move 'proj2/node_modules' to '/tmp/node_modules': Directory not
empty