aliases

aliases

aliases is a tool for resolving command dependencies with containers.

• YAML-based command definition
• Version of command with the environment variable
• Call another dependent command from the command

Install

$ go get github.com/k-kinzal/aliases

Get Started

~/.aliases/aliases.yaml

/usr/local/bin/kubectl:
  image: chatwork/kubectl
  tag: 1.11.2
  volume:
  - $HOME/.kube:/root/.kube
  - $PWD:/kube
  workdir: /kube

/usr/local/bin/alpine:
  image: alpine
  tag: 3.8
  volume:
  - $PWD:/work
  workdir: /work
  dependencies:
  - /usr/local/bin/kubectl

$ eval "$(aliases gen)"

or

$ eval "$(aliases gen --export)"

Using the option of --export can be used as a command instead of an alias.

CLI

$ aliases --help
NAME:
   aliases - Generate alias for command on the container

USAGE:
   aliases [global options] command [command options] [arguments...]

VERSION:
   v0.5.1

COMMANDS:
     gen      Generate aliases
     run      Run aliases command
     home     Get aliases home path
     help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --config value, -c value  Load configuration file
   --home value              Home directory for aliases [$ALIASES_HOME]
   --verbose, -v             enable verbose output
   --help                    show help
   --version                 print the version

Version Environment variable

If /usr/local/bin/kubectl is defined, you can specify the version in the environment variable with _VERSION in the suffix with kubectl in the file name capitalized.

$ KUBECTL_VERSION=1.11.3 kubectl get all

When version environment variable is specified, a command is executed by overwriting tag defined by YAML.

Expand Environment Variables

env:
  $ENV1: $ENV2

volume:
- $ENV1:$ENV2:rw

user: $ENV1:$ENV2

Environmental variables expand with parameters expressed like this. Env1 expands at the timing when aliases generates a command. Env2 expands at the timing when you executed a command generated by aliases

Expand commands

tty: $(if tty >/dev/null; then echo "true"; else echo "false"; fi)

volume:
- $(helm home):/root/.helm

When you enclose the command with $(...), the STDOUT of the command is set as the parameter. Command expanded at the timing when you executed a command generated by aliases.

Note: Always execute the generated command on the machine (host or docker) that executed the alias.

Special Environment Variable

$PWD is a special environment variable. The $PWD specified on the left always points to $PWD of the host.

Extend entrypoint

/usr/local/bin/helm:
  image: chatwork/helm
  tag: 2.12.3
  volume:
  - $HOME/.helm:/root/.helm
  - $PWD:/helm
  workdir: /helm
  dependencies:
  - /bin/bash:
      image: bash
      tag: 5.0.2
  - /bin/curl:
      image: byrnedo/alpine-curl
      tag: 0.1.7
  entrypoint: |
    #!/bin/sh
    if [ -f $(helm home)/plugins/helm-import ]; then
      helm plugin install https://github.com/k-kinzal/helm-import --version v0.2.1
    if
    helm "$@"

If you want to extend entrypoint, please define a string with shebang in entrypoint.

NOTE: Please understand that extend entrypoint is less reproducible. It should be included in the docker image if possible.

Dependencies commands.

aliases can define commands that depend on commands.

/usr/local/bin/sops:
  image: mozilla/sops
  tag: a2d0328e35e6e37b51f3ad468dc6f213c7b44014 
  env:
    AWS_ACCESS_KEY_ID: ${AWS_ACCESS_KEY_ID}
    AWS_SECRET_ACCESS_KEY: ${AWS_SECRET_ACCESS_KEY}
    AWS_PROFILE: ${AWS_PROFILE}
    AWS_DEFAULT_REGION: ${AWS_DEFAULT_REGION}
  volume:
  - $PWD:/sops
  workdir: /sops

/usr/local/bin/helm:
  image: chatwork/helm
  tag: 2.12.3
  volume:
  - $HOME/.helm:/root/.helm
  - $PWD:/helm
  workdir: /helm
  dependencies:
  - /usr/local/bin/sops
  - /bin/bash:
      image: bash
      tag: 5.0.2
  - /bin/curl:
      image: byrnedo/alpine-curl
      tag: 0.1.7

For dependency, reference to another command defined or define command. If you want to define a command that can only be called from a command, please recursively define the dependency.

Also, parent commands inherit dependent parameters.

$ AWS_ACCESS_KEY_ID=xxx AWS_SECRET_ACCESS_KEY=xxx helm secrets enc ...

If the same parameter exists, the parent parameter takes precedence.

How to debug aliases

If you do not get what you expected, please use the aliases run command.

$ aliases run -it --entrypoint '' [command] sh

aliases run command overwrites the option of your defined command and executes it.

$ aliases --verbose run -it --entrypoint '' [command] sh
docker run --entrypoint "" --interactive --network "host" --rm --tty [your image] sh

If you want to show the docker run command, please specify the option of --verbose.

for CircleCI

aliases supports CircleCI Orb. You can quickly execute precisely the same commands on local and CI.

version: "2.1"

orbs:
  aliases: k-kinzal/aliases@0.2.1

jobs:
  aliases:
    machine: true
    steps:
    - checkout
    - aliases/install
    - aliases/gen
    - run: [your command]

workflows:
  version: 2

  aliases:
    jobs:
    - aliases

However, since A uses privileged and volume, please use Machine Executor.

License