mkctr

mkctr: cross platform container builder for go

mkctr is a small go binary which uses GOOS= GOARCH= go build directly to compile go binaries and then uses go-containerregistry to create and publish the new containers based on the desired platforms.

This is inspired by ko which is awesome but doesn't support multiple binaries in a single container.

Usage

mkctr \
  --base="ghcr.io/tailscale/alpine-base:3.14" \
  --gopaths="\
    tailscale.com/cmd/tailscale:/usr/local/bin/tailscale, \
    tailscale.com/cmd/tailscaled:/usr/local/bin/tailscaled" \
  --tags="latest" \
  --repos="tailscale/tailscale" \
  [--target=<target>] \ # e.g. flyio
  [--push] \
  [--] [<cmd>...]

mkctr auto discovers GOOS/GOARCH from the specified base image. If the base image supports multiple platforms, binaries are compiled for each platform as long as it's one of linux/amd64, linux/386, linux/arm, linux/arm64.

Maturity

This is under active development. While Tailscale uses it, backwards compatability is not guaranteed, and some functionality is missing.