Poor man's vendoring script for Go

go-vendor.sh

#!/bin/sh

set -e

vendor_root='_vendor'

cmd_save () {
    deps="$(go list -f '{{join .Deps "\n"}}' ./...)"

    go list -f '{{if (not .Standard)}}{{.ImportPath}}{{"\t"}}{{.Dir}}{{end}}' $deps | sort \
        | while IFS="$(printf '\t')" read -r path dir; do
            vendor_path="$vendor_root/src/$path"

            if [ -d "$vendor_path" ]; then
                echo "# exists $path"
            else
                p="$(dirname "$vendor_path")"
                mkdir -p "$p"
                echo "cp -R $dir $p"
                cp -R "$dir" "$p"
            fi
        done
}

cmd_list () {
    deps="$(go list -f '{{join .Deps "\n"}}' ./...)"

    go list -f '{{if (not .Standard)}}{{.ImportPath}}{{end}}' $deps
}

cmd_rm () {
    echo rm -rf "$vendor_root"
    rm -rf "$vendor_root"
}

cmd_go () {
    echo "GOPATH=\$PWD/$vendor_root:\$GOPATH"
    echo "go $@"
    GOPATH="$PWD/$vendor_root":$GOPATH go "$@"
}

usage () {
    echo "usage: $0 {save|list|rm|go}" >&2
    exit 1
}

cmd="$1"
shift || usage

case "$cmd" in
    save)
        cmd_save
        ;;

    list)
        cmd_list
        ;;

    rm)
        cmd_rm
        ;;

    go)
        cmd_go "$@"
        ;;

    *)
        usage
        ;;
esac