Telegraf Build

telegraf-build.sh

#!/bin/bash
# Checks out specified release tag and builds the binary
#

VERBOSITY=0
TEMP_D=""

error() { echo "$@" 1>&2; }
fail() { [ $# -eq 0 ] || error "$@"; exit 1; }
bad_usage() { usage 1>&2; [ $# -eq 0 ] || error "$@"; return 1; }

cleanup() {
    [ -z "${TEMP_D}" ] || [ ! -d "${TEMP_D}" ] || rm -Rf "${TEMP_D}"
}

debug() {
    local level=${1}; shift;
    [ "${level}" -gt "${VERBOSITY}" ] && return
    error "${@}"
}

usage() {
    cat <<EOF
Usage: ${0##*/} [ options ] <tag[s]>

   Will checkout a specific git tag of Telegraf and build the project

   options:
      -g|--go        path to go binary (default: /usr/bin/go)
      -h|--help      this help output
      -v|--verbose   verbose logging
EOF
}

main() {
    local short_opts="hg:v"
    local long_opts="help,go:,verbose"
    local getopt_out=""
    getopt_out=$(getopt --name "${0##*/}" \
        --options "${short_opts}" --long "${long_opts}" -- "$@") ||
        { bad_usage; return; }
    eval set -- "${getopt_out}" ||
        { bad_usage; return; }

    local go_binary="/usr/bin/go"
    local cur="" next=""
    while [ $# -ne 0 ]; do
        cur="$1"; next="$2";
        case "$cur" in
            -g|--go) go_binary=$next;;
            -h|--help) usage ; exit 0;;
            -v|--verbose) VERBOSITY=$((VERBOSITY+1));;
            --) shift; break;;
        esac
        shift;
    done

    ## check arguments here - how many args do you expect?
    [ $# -gt 0 ] || { bad_usage "must provide at least one git tag"; return; }

    DEST_D=$(pwd)
    TEMP_D=$(mktemp -d "${TMPDIR:-/tmp}/${0##*/}.XXXXXX") ||
        fail "failed to make tempdir"
    trap cleanup EXIT

    git version || fail "git binary not found"
    $go_binary version || fail "go binary not found"

    # program starts here
    git clone https://github.com/influxdata/telegraf.git "$TEMP_D" || fail "git checkout failed"
    cd "$TEMP_D" || fail "failed to switch to temporary dir"

    git fetch --all --tags || fail "could not fetch tags"
    for tag in "$@"; do
        echo "checking out and building: $tag"
        git checkout "tags/$tag" -B "$tag" || fail "failed to checkout $tag"
        git show

        $go_binary mod vendor
        time make

        mv telegraf "$DEST_D/telegraf-$tag"
    done

    return 0
}

main "$@"

# vi: ts=4 noexpandtab