Install direnv on a Go-less system using Go in Docker

direnv-build.sh

#! /usr/bin/env bash
#
# Install direnv on a Go-less system using Go in Docker.
#
set -ex

# latest stable release
#DIRENV_VER=v2.32.3
# don't use above as much is fixed in master

#GO_VER=1.21
GO_VER=1-bookworm

main() {
    src
    cd direnv.git
    # much of this tag is b0rk!
    #git switch --detach $DIRENV_VER

    img
    #bld
    #tst
    ins

    cd ..
    cln
}

src() {
    ! test -d direnv.git ||return 0
    git clone git@github.com:direnv/direnv.git direnv.git
}

img() {
    docker build -t build-direnv - <<-EOF
	FROM golang:$GO_VER

	# needed for make test
	COPY --from=koalaman/shellcheck:latest \
	    /bin/shellcheck /bin/shellcheck
	COPY --from=golangci/golangci-lint:latest \
	    /usr/bin/golangci-lint /usr/bin/golangci-lint

	# more shells needed for make test
	RUN apt-get update && apt-get install -y \
	    elvish \
	    fish \
	    tcsh \
	    zsh

	# and Microsoft's PowerShell is a bit trickier
	RUN wget --no-verbose \
	    https://github.com/PowerShell/PowerShell/releases/download/v7.2.16/powershell-lts_7.2.16-1.deb_amd64.deb && \
	    dpkg --install powershell-lts_7.2.16-1.deb_amd64.deb ; \
	    apt-get install --fix-broken --yes && \
	    rm powershell-lts_7.2.16-1.deb_amd64.deb

	# give make build proper perms in .:/direnv
	RUN useradd --uid $UID --gid "${GROUPS[0]}" \
	  --create-home --shell /bin/bash $USER

	# only needed for make man on v2.32.3 (not master anymore)
	#RUN go install github.com/cpuguy83/go-md2man/v2@latest

        # also a legacy artifact of tag v2.32.3
	#RUN chmod -R 777 /go/pkg/mod

	WORKDIR /direnv
	EOF
}

bld() {
    docker run --rm \
      --volume "$PWD:/direnv" \
      --user "$UID:${GROUPS[0]}" \
      build-direnv \
      make
}

tst() {
    docker run --rm \
      --volume "$PWD:/direnv" \
      --user "$UID:${GROUPS[0]}" \
      build-direnv \
      make test
}

ins() {
    docker run --rm \
      --volume "$PWD:/direnv" \
      --volume "$HOME/.local:/.local" \
      --user "$UID:${GROUPS[0]}" \
      build-direnv \
      make install PREFIX=/.local
}

cln() {
    rm --force --recursive direnv.git
    docker image rm build-direnv
}

main
exit 0