In the previous section the only inputs to the task container were the
image used. Base images, such as Docker images, are relatively static and relatively big, slow things to create. So Concourse supports
inputs into tasks to pass in files/folders for processing.
Consider the working directory of a task that explicitly has no inputs:
cd ../task-inputs fly -t tutorial e -c no_inputs.yml
The task runs
ls -al to show the (empty) contents of the working folder inside the container:
running ls -al total 8 drwxr-xr-x 2 root root 4096 Feb 27 07:23 . drwxr-xr-x 3 root root 4096 Feb 27 07:23 ..
Note that above we used the short-hand form of the execute command in this example, simply e, as the action. Many commands have shortened single character forms, for example fly s is an alias for fly sync.
In the example task
inputs_required.yml we add a single input:
inputs: - name: some-important-input
When we try to execute the task:
fly -t tutorial e -c inputs_required.yml
It will fail:
error: missing required input `some-important-input`
Commonly if wanting to run
fly execute we will want to pass in the local folder (
-i name=path option to configure each of the required
fly -t tutorial e -c inputs_required.yml -i some-important-input=.
fly execute command will upload the
. directory as an input to the container. It will be made available at the path
running ls -alR .: total 12 drwxr-xr-x 3 root root 4096 Dec 18 02:35 . drwxr-xr-x 3 root root 4096 Dec 18 02:35 .. drwxr-xr-x 1 root root 4096 Dec 18 02:35 some-important-input ./some-important-input: total 24 drwxr-xr-x 1 root root 4096 Dec 18 02:35 . drwxr-xr-x 3 root root 4096 Dec 18 02:35 .. -rw-r--r-- 1 501 20 156 Dec 9 22:26 input_parent_dir.yml -rw-r--r-- 1 501 20 162 Dec 9 22:26 inputs_required.yml -rw-r--r-- 1 501 20 123 Dec 9 22:26 no_inputs.yml -rwxr-xr-x 1 501 20 522 Dec 17 21:31 test.sh
To pass in a different directory as an input, provide its absolute or relative path:
fly -t tutorial e -c inputs_required.yml -i some-important-input=../task-hello-world
fly execute -i option can be removed if the current directory is the same name as the required input.
input_parent_dir.yml contains an input
task-inputs which is also the current directory. So the following command will work and return the same results as above:
fly -t tutorial e -c input_parent_dir.yml