diskimage-builder/diskimage_builder/elements/source-repositories/pkg-map

{
  "family": {
    "gentoo": {
      "git": "dev-vcs/git"
    },
    "redhat": {
      "git": "git-core"
    },
    "suse": {
      "git": "git-core"
    }
  },
  "default": {
    "git": "git"
  }
}