Taskfile example for templated container builds

folder structure

Assumung forlder structure

Taskfile.yml     # root task file (not included in Gist)
Gopkg.tompl      # for dep 
Gopkg.lock       # for dep
vendor/          # generated by dep
cmd/             # go main packacges (compilable programs)
. product-api1/  # example main package
. . main.go
pkg/             # locally shared go packages
docker/
. images/        # docker images
. . Taskfile.yml # taskfile for docker images (included in Gist)
. . product-ap1/ # example docker context folder
. . . Dockerfile
. . . bin/       # generated by Taskfile.yml
. stacks/        # example folder to maintain e.g. deployment Taskfiles, composefiles and/or kuberentes pods.

Taskfile.yml (docker images)

## -- build groups --

default:
  desc: "alias for all"
  deps:
    - all

all:
  desc: "group for building all container images"
  deps:
   - apis
   - maintenance
   - product-web

apis:
  desc: "group for building the product API containers"
  deps:
   - product-api1
   - product-api2
   - product-api3

maintenance:
  desc: "group for building product maintenance containers"
  deps:
    - backup


# -- individual build targets --

product-api1:
  desc: builds the 'company/product-api1' Docker image
  deps:
    - task: tmpl/go-cmd-docker-image
      vars:
        NAME: "product-api1"

product-api2:
  desc: builds the 'company/product-api2' Docker image
  deps:
    - task: tmpl/go-cmd-docker-image
      vars:
        NAME: "product-api2

product-api3:
  desc: builds the 'company/product-api3' Docker image
  deps:
    - task: tmpl/go-cmd-docker-image
      vars:
        NAME: "product-api3

product-web:
  desc: builds the 'company/product-web' Docker image
  dir: backup
  cmds:
    - docker build -t company/product-web .

backup:
  desc: builds the 'company/backup' Docker image
  dir: backup
  cmds:
    - docker build -t company/backup .


## -- template tasks --

tmpl/go-cmd-docker-image:
  dir: "{{.NAME}}"
  deps:
    - task: tmpl/go-build-for-docker
      vars:
        SRC_DIR: 'cmd/{{.NAME}}'
    	TARGET_DIR: 'docker/images/{{.NAME}}/bin'
  cmds:
    - docker build -t company/{{.NAME}} .
    - touch .task-done   # speed up build-process slightly.
  sources:
    - ./**/*
  generates:
    - .task-done

tmpl/go-build-for-docker:
  # reusable task to build a static golang binary intended for Docker scratch images
  dir: ../..
  deps:
    - root/vendor
  cmds:
    - mkdir -p "{{.TARGET_DIR}}"
    - go build -o "{{.TARGET_DIR}}/{{.NAME}}" -ldflags '-s -w' "./{{.SRC_DIR}}"
  env:
    GOOS: "linux"
    GOARCH: "amd64"
    CGO_ENABLED: "0"
  sources:
    - "pkg/**/*.go"
    - "{{.SRC_DIR}}/**/*.go"
    - "vendor/**/*.go"
  generates:
    - "{{.TARGET_DIR}}/{{.NAME}}"


## -- external tasks --

root/vendor:
  # install go vendor dependencies
  dir: ../../
  cmds:
   - task vendor
  # FIXME: should get status of parent task https://github.com/go-task/task/issues/81
  sources:
   - Gopkg.lock
  generates:
    - vendor/**/*.go