I noticed this error in CI:
```
20:37:25 INFO: Non-base image count on control daemon to delete is 9
20:37:25 "docker rmi" requires at least 1 argument.
20:37:25 See 'docker rmi --help'.
20:37:25
20:37:25 Usage: docker rmi [OPTIONS] IMAGE [IMAGE...]
20:37:25
20:37:25 Remove one or more images
```
Which indicated that the PowerShell script managed to find images to delete, but
not actually passing the images to `docker rmi`.
The reason for this failing was that the script attempted to convert the
collection/array to a string, which produces;
```powershell
Write-Output $(docker images --format "{{.Repository}}:{{.ID}}" | `
>> select-string -NotMatch "windowsservercore" | `
>> select-string -NotMatch "nanoserver" | `
>> select-string -NotMatch "docker" `
>> ).ToString()
System.Object[]
```
Which, when trying to split by the chosen separator (`:`), will return the same;
```powershell
Write-Output "System.Object[]".Split(":")[0]
```
This patch:
- Adds an intermediate variable (`$allImages`) to make the code better readable
- Switches the separator to `#`, to prevent breaking on images pulled from a
repository with a port in its name (`myregistry:5000/my/image`)
- Switches to use a comma-separated list for `-NotMatch` (for readability)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 5580b79813d3a5d2a7b83bcf1607839a5b0f468d)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: 74fe2c044f56e58356e9f598e5b08d94e676bbd4
Component: engine
8332f4444c