"process" substitution executes command immediately after substitution

[jontroncoso]

The command is getting executed before continuing after the substitution. So, if you use the substitution in the middle and have other options after the substitution, the post-substitution options/flags/arguments won't be read.

// composer.json
{
  "scripts": {
    "bash": [
      "docker exec -ti {CONTAINER} bash"
    ]
  },
    "substitution": {
      "enable": true,
      "mapping": {
        "{CONTAINER}": {
          "type": "process",
          "value": "docker ps -aqf ancestor=special-tag"
        }
      }
    }
}

results in

ivr (git)-[1337-ivr-tests]- % composer bash
> docker exec -ti ae055d08efb2
 bash
"docker exec" requires at least 2 arguments.
See 'docker exec --help'.

Usage:  docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

[villfa]

I see there is a line break in your command (between the container id and bash):

> docker exec -ti ae055d08efb2
 bash

It probably comes from docker ps.

You can trim the command result this way:

    "substitution": {
      "enable": true,
      "mapping": {
        "{CONTAINER}": {
          "type": "process",
          "value": "docker ps -aqf ancestor=special-tag",
          "escape": "trim"
        }
      }
    }

[jontroncoso]

@villfa Thank you so much. This resolved this specific issue. However now I have a new issue (which i'm sure is unrelated):

ivr (git)-[DDA-629-IVR-account-balances]- % composer bash
> docker exec -ti 95bf3fa16ef9 bash
the input device is not a TTY
Script docker exec -ti 95bf3fa16ef9 bash handling the bash event returned with error code 1

This appears to be a limitation with composer itself though. Thanks again!

[villfa]

You could try adding < /dev/tty to your script:

"scripts": {
    "bash": [
        "docker exec -ti {CONTAINER} bash < /dev/tty"
    ]
}

Meanwhile I close this issue since your first problem seems fixed.