* Add a development environnment installer for minio project with an automatic dependency installation

* Install minio in /home/vadmeste/minio-dev by default
* Check for host architecutre before installing
* Check the minio dev directory before start
* env.sh is always in the root of minio-dev directory, use base dirname instead of hardcoded path
* Explain why we use main function in the script
* env.sh should not mess with GOROOT variable if already defined
* Force the user to set GOROOT var if golang is already installed
* Prettify the script output
* Hide pushd/popd output

minio_install_env.sh

@@ -0,0 +1,161 @@
+#!/usr/bin/env bash
+
+GO_VERSION="1.4.1"
+GOLANG_MD5SUM=""
+YASM_VERSION="1.2.0"
+UNAME=$(uname -sm)
+MINIO_DEV=$HOME/minio-dev
+
+die() {
+    echo -e "\e[31m[!] $@\e[0m"; exit 1
+}
+
+msg() {
+    echo -e "\e[93m[*] $@\e[0m"
+} 
+
+call() {
+    $@ 2>&1 | sed 's/^\(.*\)$/ | \1/g'
+}
+
+push_dir() {
+    pushd $@ >/dev/null
+}
+
+pop_dir() {
+    popd >/dev/null
+}
+
+check_version() {
+    local version=$1 check=$2
+    local highest=$(echo -e "$version\n$check" | sort -nrt. -k1,1 -k2,2 -k3,3 | head -1)
+    [[ "$highest" = "$version" ]] && return 0
+    return 1
+}
+
+is_supported() {
+    local supported
+    case ${UNAME##* } in
+        "x86_64")
+            supported=1
+            ;;
+        "i386") 
+            supported=0
+            ;;
+        *) 
+            supported=0
+            ;;
+    esac
+    if [ $supported -eq 0 ]; then
+        die "Invalid arch: ${UNAME} not supported, please use x86_64/amd64"   
+    fi 
+}
+
+install_go() {
+    msg "Downloading golang.."
+
+    case ${UNAME%% *} in
+        "Linux")
+            os="linux"
+            ;;
+    esac
+    case ${UNAME##* } in
+        "x86_64")
+            arch="amd64"
+            ;;
+    esac
+
+    GOLANG_TARBALL_FNAME="go$GO_VERSION.$os-$arch.tar.gz"
+    GOLANG_TARBALL_URL="https://storage.googleapis.com/golang/$GOLANG_TARBALL_FNAME"
+
+    call curl --progress-bar -C - $GOLANG_TARBALL_URL -o $MINIO_DEV/dls/$GOLANG_TARBALL_FNAME
+
+    call tar -xf $MINIO_DEV/dls/$GOLANG_TARBALL_FNAME -C $MINIO_DEV/deps
+}
+
+install_yasm() {
+
+    msg "Downloading yasm.."
+
+    YASM_TARBALL_FNAME="yasm-$YASM_VERSION.tar.gz"
+    YASM_TARBALL_URL="http://www.tortall.net/projects/yasm/releases/$YASM_TARBALL_FNAME"
+
+    curl --progress-bar -C - $YASM_TARBALL_URL -o $MINIO_DEV/dls/$YASM_TARBALL_FNAME
+
+    call tar -xf $MINIO_DEV/dls/$YASM_TARBALL_FNAME -C $MINIO_DEV/deps/
+    push_dir $MINIO_DEV/deps/yasm-$YASM_VERSION
+    call ./configure
+    call make
+    pop_dir
+}
+
+setup_env() {
+    python_version=$(python --version 2>&1 | sed 's/Python \([0-9]*.[0-9]*\).*/\1/')
+    cat <<EOF > env.sh
+#!/bin/sh
+
+PWD=\$(pwd)
+[[ -z \$GOROOT ]] && export GOROOT=\$PWD/deps/go
+export GOPATH=\$PWD/mygo
+export PATH=\$PWD/deps/go/bin:\$PWD/mygo/bin:\$PWD/deps/yasm-$YASM_VERSION:\$PWD/deps/mkdocs/bin:\$GOPATH/bin:\$PATH
+export PYTHONPATH=\$PYTHONPATH:\$PWD/deps/mkdocs/lib/python$python_version/site-packages/
+EOF
+}
+
+install_mkdocs() {
+    msg "Downloading mkdocs.."
+    mkdir -p $MINIO_DEV/deps/mkdocs
+    call pip install --install-option="--prefix=$MINIO_DEV/deps/mkdocs" mkdocs
+}
+
+install_minio() {
+    msg "Installing minio.."
+    push_dir src
+    call git clone "http://github.com/minio-io/minio"
+    (cd minio; call make)
+    call git clone "http://github.com/minio-io/mc"
+    (cd mc; call make)
+    pop_dir
+}
+
+main() {
+
+    is_supported
+
+    [[ -d ${MINIO_DEV} ]] || \
+       die "You should have an empty working directory before you start.."
+
+    mkdir -p ${MINIO_DEV}/{src,deps,dls,mygo}
+    push_dir ${MINIO_DEV}
+
+    env pip --version >/dev/null
+    [[ $? -ne 0 ]] && die "pip not installed"
+
+    env gcc --version >/dev/null
+    [[ $? -ne 0 ]] && die "gcc not installed"
+
+    check_version "$(env git --version)" "1.0"
+    [[ $? -ne 1 ]] && die "Git not installed"
+
+    check_version "$(env go version 2>/dev/null | sed 's/^.* go\([0-9.]*\).*$/\1/')" "1.4.0"
+    [[ $? -eq 0 ]] && \
+        [[ -z $GOROOT ]] && die "Please setup the goroot variable according to your current installation of golang." \
+        || install_go
+
+    check_version "$(env yasm --version 2>/dev/null)" "1.2.0"
+    [[ $? -eq 0 ]] || install_yasm
+
+    env mkdocs help 2>/dev/null
+    [[ $? -eq 0 ]] || install_mkdocs
+
+    setup_env
+    source env.sh
+    install_minio
+
+    msg "--"
+    msg "Run ''source env.sh'' to setup your work env."
+}
+
+# Putting main function at the end of the script ensures that the execution
+# won't start until the script is entirely downloaded.
+main