#!/bin/sh set -e help() {    cat <<'EOF'Install a binary release of a Rust crate hosted on GitHub Usage:    install.sh [options] Options:    -h, --help      Display this message    --git SLUG      Get the crate from "https://github/$SLUG"    -f, --force     Force overwriting an existing binary    --crate NAME    Name of the crate to install (default <repository name>)    --tag TAG       Tag (version) of the crate to install (default <latest release>)    --target TARGET Install the release compiled for $TARGET (default <`rustc` host>)    --to LOCATION   Where to install the binary (default ~/.cargo/bin)EOF} say() {    echo "install.sh: $1"} say_err() {    say "$1" >&2} err() {    if [ ! -z $td ]; then        rm -rf $td    fi     say_err "ERROR $1"    exit 1} need() {    if ! command -v $1 > /dev/null 2>&1; then        err "need $1 (command not found)"    fi} force=falsewhile test $# -gt 0; do    case $1 in        --crate)            crate=$2            shift            ;;        --force | -f)            force=true            ;;        --git)            git=$2            shift            ;;        --help | -h)            help            exit 0            ;;        --tag)            tag=$2            shift            ;;        --target)            target=$2            shift            ;;        --to)            dest=$2            shift            ;;        *)            ;;    esac    shiftdone # Dependenciesneed basenameneed curlneed installneed mkdirneed mktempneed tar # Optional dependenciesif [ -z $crate ] || [ -z $tag ] || [ -z $target ]; then    need cutfi if [ -z $tag ]; then    need revfi if [ -z $target ]; then    need grep    need rustcfi if [ -z $git ]; then    err 'must specify a git repository using `--git`. Example: `install.sh --git japaric/cross`'fi url="https://github.com/$git"say_err "GitHub repository: $url" if [ -z $crate ]; then    crate=$(echo $git | cut -d'/' -f2)fi say_err "Crate: $crate" url="$url/releases" if [ -z $tag ]; then    tag=$(curl -s "$url/latest" | cut -d'"' -f2 | rev | cut -d'/' -f1 | rev)    say_err "Tag: latest ($tag)"else    say_err "Tag: $tag"fi if [ -z $target ]; then    target=$(rustc -Vv | grep host | cut -d' ' -f2)fi say_err "Target: $target" if [ -z $dest ]; then    dest="$HOME/.cargo/bin"fi say_err "Installing to: $dest" url="$url/download/$tag/$crate-$tag-$target.tar.gz" say_err "Downloading: $url"td=$(mktemp -d || mktemp -d -t tmp)curl -sL $url | tar -C $td -xz for f in $(cd $td && find . -type f); do    test -x $td/$f || continue     if [ -e "$dest/$f" ] && [ $force = false ]; then        err "$f already exists in $dest"    else        mkdir -p $dest        install -v -m 755 $td/$f $dest    fidone rm -rf $td