add-gomod.sh

#!/usr/bin/env bash
set -euo pipefail
ignore="(go-libp2p-quic-transport|go-libp2p-tls)"   ## regex of modules for whom to bypass automatic gomod migration.
travis_file=$(cat << EOF
os:
  - linux

language: go

go:
  - 1.11.x

env:
  global:
    - GOTFLAGS="-race"
  matrix:
    - BUILD_DEPTYPE=gx
    - BUILD_DEPTYPE=gomod


# disable travis install
install:
  - true

script:
  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)


cache:
  directories:
    - \$GOPATH/src/gx
    - \$GOPATH/pkg/mod
    - \$HOME/.cache/go-build

notifications:
  email: false
EOF
)

## do_convert() performs the conversion. It can be called with an optional argument: the module to start with.
do_convert() {
    modules=()
    for d in $(ls -d */)
    do
        if [[ "$d" < ${1:-} || $(echo $d | grep -cE $ignore) > 0 ]]; then
            echo "skipping $d"
            continue
        fi
        pushd $d > /dev/null
        if [[ -z $(git tag -l | grep -E "^v0.0.1") ]]; then
            ## only convert this module if it hasn't been converted yet.
            modules+=($(echo $d | sed 's/.$//'))     ## remove trailing slash
        fi
        popd > /dev/null
    done
    
    for mod in ${modules[@]}
    do
        echo ""
        echo "**********************************************"
        echo " Processing: $mod"
        echo "**********************************************"
        echo ""
       
        pushd $mod > /dev/null
        git checkout master && git reset --hard && git pull --rebase origin master
        git branch -D gomod || true
        git checkout -b gomod
        rm -rf go.mod go.sum
        GO111MODULE=on go mod init "github.com/libp2p/$mod"
        go build ./... && go mod tidy && go mod verify
        echo "$travis_file" > .travis.yml
        libp2p_deps=$(grep -E '\tgithub.com/libp2p/.* v0.0.0' go.mod) || true  # guard the non-zero exit value of grep from killing the shell
        if [[ -z $libp2p_deps ]]; then
            echo ""
            echo "------------------------------------------------------------"
            echo " module $mod looks ready; branching, committing and tagging."
            echo "------------------------------------------------------------"
            echo ""

            git add go.mod .travis.yml || true   # go.sum might not exist if the module imports nothing
            if [[ -f go.sum ]]; then
                git add go.sum
            fi
            git commit -m "add gomod support // tag v0.0.1."
            git --no-pager log --oneline
            
            push=""
            read -r -n1 -p "push and tag? [y/n] " push
            if [[ "$push" != "y" ]]; then
                popd > /dev/null
                continue
            fi

            git push origin
            git tag "v0.0.1" || true
            git push origin "refs/tags/v0.0.1"
        fi
        popd > /dev/null
    done
}

do_convert "$@"