This fix tries to address the issue raised in 29999 where it was not
possible to mask these items (like important non-removable stuff)
from `docker system prune`.
This fix adds `label` and `label!` field for `--filter` in `system prune`,
so that it is possible to selectively prune items like:
```
$ docker container prune --filter label=foo
$ docker container prune --filter label!=bar
```
Additional unit tests and integration tests have been added.
This fix fixes 29999.
Signed-off-by: Yong Tang <yong.tang.github@outlook.com>
This adjusts `command.PromptForConfirmation` in `cli/command/utils.go` to use `bufio`'s `ReadLine` rather than using `fmt.Fscan` for reading input, which makes `<Enter>` properly accept the default value of "No" as one would expect.
This new code actually came from `cli/command/plugin/install.go`'s `acceptPrivileges` function, which I've also refactored here to use `command.PromptForConfirmation` as it should.
Additionally, this updates `cli/command/plugin/upgrade.go`'s `runUpgrade` function to use `command.PromptForConfirmation` for further consistency.
Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>
