'Docker cp' with parameter expansion (PowerShell)

Question

I want to copy a directory into a docker container, which is only defined by a certain query. I tried this:

docker cp ../from-here/. $(docker ps -aqf "name=my-ending$"):/to-here

Unforunately this throws this error:

"docker cp" requires exactly 2 arguments.

Running the same command with pasting the real Container ID works.

It seems, that PowerShell in combination with Docker doesn't allow parameter expansion.

Is there an easy work around for this problem in a single line?

score 1 · Accepted Answer · answered Dec 01 '20 at 15:29

1

This works:

docker @("cp", "../from-here/.", "$(docker ps -aqf "name=my-ending$"):/to-here")

answered Dec 01 '20 at 15:29

nilosch

score 0 · Answer 2 · answered Dec 01 '20 at 14:56

0

in power shell you need to use | (pipe) to continue commands

docker cp ../from-here/. | % {docker ps -aqf "name=my-ending$"}:/to-here

answered Dec 01 '20 at 14:56

ozs

Throws the following: `+ CategoryInfo : InvalidArgument: (:) [ForEach-Object], ParameterBindingException` `+ FullyQualifiedErrorId : CannotConvertArgumentNoMessage,Microsoft.PowerShell.Commands.ForEachObjectCommand` – nilosch Dec 01 '20 at 15:28
what about using for-each: Foreach ($docker_container_name in (docker ps -aq)) { $cp_arguments = @("cp","/from_here","$($docker_container_name):/to_here") docker $cp_arguments } – ozs Dec 01 '20 at 15:52

2 Answers2