Restore dnvm scripts (#1761)

* Revert "Remove old artifacts from Home repo (#1754)"

This reverts commit 3b8fc8c650.

* Add back dnvm scripts

dnvm.cmd

@@ -0,0 +1,10 @@
+@Echo off
+
+for /f "delims=" %%i in ('PowerShell -NoProfile -NoLogo -ExecutionPolicy unrestricted -Command "[System.IO.Path]::GetTempFileName()"') do set DNVM_CMD_PATH_FILE="%%i.cmd"
+
+PowerShell -NoProfile -NoLogo -ExecutionPolicy unrestricted -Command "[System.Threading.Thread]::CurrentThread.CurrentCulture = ''; [System.Threading.Thread]::CurrentThread.CurrentUICulture = '';$CmdPathFile='%DNVM_CMD_PATH_FILE%';& '%~dp0dnvm.ps1' %*"
+
+IF EXIST %DNVM_CMD_PATH_FILE% (
+  CALL %DNVM_CMD_PATH_FILE%
+  DEL %DNVM_CMD_PATH_FILE%
+)

dnvminstall.ps1

@@ -0,0 +1,17 @@
+$tempPath = Join-Path $env:TEMP "dnvminstall"
+$dnvmPs1Path = Join-Path $tempPath "dnvm.ps1"
+$dnvmCmdPath = Join-Path $tempPath "dnvm.cmd"
+
+Write-Host "Using temporary directory: $tempPath"
+if (!(Test-Path $tempPath)) { md $tempPath | Out-Null }
+
+
+$webClient = New-Object System.Net.WebClient
+$webClient.Proxy = [System.Net.WebRequest]::DefaultWebProxy
+$webClient.Proxy.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials
+Write-Host "Downloading DNVM.ps1 to $dnvmPs1Path"
+$webClient.DownloadFile('https://raw.githubusercontent.com/aspnet/Home/dev/dnvm.ps1', $dnvmPs1Path)
+Write-Host "Downloading DNVM.cmd to $dnvmCmdPath"
+$webClient.DownloadFile('https://raw.githubusercontent.com/aspnet/Home/dev/dnvm.cmd', $dnvmCmdPath)
+Write-Host "Installing DNVM"
+& $dnvmCmdPath setup

dnvminstall.sh

@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+
+_dnvmsetup_has() {
+    type "$1" > /dev/null 2>&1
+    return $?
+}
+
+_dnvmsetup_update_profile() {
+    local profile="$1"
+    local sourceString="$2"
+    if ! grep -qc 'dnvm.sh' $profile; then
+        echo "Appending source string to $profile"
+        echo "" >> "$profile"
+        echo $sourceString >> "$profile"
+    else
+        echo "=> Source string already in $profile"
+    fi
+}
+
+if [ -z "$DNX_USER_HOME" ]; then
+    eval DNX_USER_HOME=~/.dnx
+fi
+
+if ! _dnvmsetup_has "curl"; then
+    echo "dnvmsetup requires curl to be installed"
+    return 1
+fi
+
+if [ -z "$DNVM_SOURCE" ]; then
+    DNVM_SOURCE="https://raw.githubusercontent.com/aspnet/Home/dev/dnvm.sh"
+fi
+
+# Downloading to $DNVM_DIR
+mkdir -p "$DNX_USER_HOME/dnvm"
+if [ -s "$DNX_USER_HOME/dnvm/dnvm.sh" ]; then
+    echo "dnvm is already installed in $DNX_USER_HOME/dnvm, trying to update"
+else
+    echo "Downloading dnvm as script to '$DNX_USER_HOME/dnvm'"
+fi
+
+curl -s "$DNVM_SOURCE" -o "$DNX_USER_HOME/dnvm/dnvm.sh" || {
+    echo >&2 "Failed to download '$DNVM_SOURCE'.."
+    return 1
+}
+
+echo
+
+# Detect profile file if not specified as environment variable (eg: PROFILE=~/.myprofile).
+if [ -z "$PROFILE" ]; then
+    if [ -f "$HOME/.bash_profile" ]; then
+        PROFILE="$HOME/.bash_profile"
+    elif [ -f "$HOME/.bashrc" ]; then
+        PROFILE="$HOME/.bashrc"
+    elif [ -f "$HOME/.profile" ]; then
+        PROFILE="$HOME/.profile"
+    fi
+fi
+
+if [ -z "$ZPROFILE" ]; then
+    if [ -f "$HOME/.zshrc" ]; then
+        ZPROFILE="$HOME/.zshrc"
+    fi
+fi
+
+SOURCE_STR="[ -s \"$DNX_USER_HOME/dnvm/dnvm.sh\" ] && . \"$DNX_USER_HOME/dnvm/dnvm.sh\" # Load dnvm"
+
+if [ -z "$PROFILE" -a -z "$ZPROFILE" ] || [ ! -f "$PROFILE" -a ! -f "$ZPROFILE" ] ; then
+    if [ -z "$PROFILE" ]; then
+      echo "Profile not found. Tried ~/.bash_profile ~/.zshrc and ~/.profile."
+      echo "Create one of them and run this script again"
+    elif [ ! -f "$PROFILE" ]; then
+      echo "Profile $PROFILE not found"
+      echo "Create it (touch $PROFILE) and run this script again"
+    else
+      echo "Profile $ZPROFILE not found"
+      echo "Create it (touch $ZPROFILE) and run this script again"
+    fi
+    echo "  OR"
+    echo "Append the following line to the correct file yourself:"
+    echo
+    echo " $SOURCE_STR"
+    echo
+else
+    [ -n "$PROFILE" ] && _dnvmsetup_update_profile "$PROFILE" "$SOURCE_STR"
+    [ -n "$ZPROFILE" ] && _dnvmsetup_update_profile "$ZPROFILE" "$SOURCE_STR"
+fi
+
+echo "Type 'source $DNX_USER_HOME/dnvm/dnvm.sh' to start using dnvm"