Overriding variable values at the target level in the bakefile

[guilhemCap]

Description

I'd like to do the following:

Creating a common target and variables, affect it different keys like:

variable "IMAGE" {}
variable "TAG" {}

target "__common__" {
  tags = [
    "ghcr.io/OWNER/${IMAGE}:latest",
    "ghcr.io/OWNER/${IMAGE}:${TAG}"
  ]
  cache-to = [
    {
      type  = "registry"
      ref   = "ghcr.io/OWNER/${IMAGE}:cache"
    }
  ]
  cache-from = [
    {
      type  = "registry"
      ref   = "ghcr.io/OWNER/${IMAGE}:cache"
    }
  ]
}

And then override it at the target level like this:

target "target-1" {
  inherits = ["_common"]
  context = "./docker"
  dockerfile = "Dockerfile"
  vars= {
    image-name = "target-1"
  }
}

I am not sure this feature exists, the current workaround might be to use a matrix strategy and no common target

[tonistiigi]

You can use a matrix or define custom functions that return tags/cache based on input params.