Initial multi-os support, see saltstack/salty-vagrant/#1

A sh bootstrapping script is copied to the target VM and used to determine the correct method of installing the Salt binaries.
Any operating system supported by Salt with a sh shell can be added to the bootstrapping script.

bootstrap-salt-minion.sh

@@ -0,0 +1,86 @@
+#!/bin/sh
+LOGFILE=/var/log/bootstrap-salt-minion.log 
+
+log() {
+    message="$@"
+    echo $message
+    echo $message >>$LOGFILE
+}
+
+UNAME=`uname`
+if [ "$UNAME" != "Linux" ] ; then
+    log "Sorry, this OS is not supported."
+    exit 1
+fi
+
+set -e
+trap "echo Installation failed." EXIT
+
+if [ "$UNAME" = "Linux" ] ; then
+    do_with_root() {
+        if [ `whoami` = 'root' ] ; then
+            RESULT=$($*)
+            log $RESULT
+        else
+            log "Salt requires root privileges to install. Please re-run this script as root."
+            exit 1
+        fi
+    }
+ 
+    if [ -f /etc/lsb-release ] ; then
+        OS=$(lsb_release -si)
+        CODENAME=$(lsb_release -sc)
+
+        if [ $OS = 'Ubuntu' ]; then
+            if [ $CODENAME = 'oneiric' ]; then
+                log "Installing for Ubuntu Oneiric."
+                do_with_root apt-get update
+                do_with_root apt-get -y install python-software-properties
+                do_with_root add-apt-repository -y 'deb http://us.archive.ubuntu.com/ubuntu/ oneiric universe'
+                do_with_root add-apt-repository -y ppa:saltstack/salt
+                do_with_root apt-get update
+                do_with_root apt-get -y install msgpack-python salt-minion
+                do_with_root add-apt-repository -y --remove 'deb http://us.archive.ubuntu.com/ubuntu/ oneiric universe'
+            elif [ $CODENAME = 'lucid' -o $CODENAME = 'precise' ]; then
+                log "Installing for Ubuntu Lucid/Precise."
+                do_with_root apt-get update
+                do_with_root apt-get -y install python-software-properties
+                do_with_root add-apt-repository -y ppa:saltstack/salt
+		do_with_root apt-get update
+                do_with_root apt-get -y install salt-minion
+            else
+                log "Ubuntu $CODENAME is not supported."
+                exit 1
+            fi
+        elif [ $OS = 'Debian' ]; then
+            if [ $CODENAME = 'wheezy' -o $CODENAME = 'jessie' ]; then
+                log "Installing for Debian Weezy/Jessie."
+                do_with_root apt-get -y install salt-minion
+            else
+                log "Debian $CODENAME is not supported."
+                exit 1
+            fi
+        else
+            log "Debian variant $OS not supported."
+            exit 1
+        fi
+    elif [ -f /etc/debian_version ] ; then
+        DVER=$(cat /etc/debian_version)
+        if [ $DVER = '6.0'  ]; then
+            log "Installing for Debian Squeeze."
+            do_with_root echo "deb http://backports.debian.org/debian-backports squeeze-backports main" >> /etc/apt/sources.list.d/backports.list
+            do_with_root apt-get update
+            do_with_root apt-get -t squeeze-backports -y install salt-minion
+        else
+            log "Debian version $VER not supported."
+            exit 1
+        fi
+    else
+        log "Unable to install. Bootstrapping only supported on Debian/Ubuntu."
+        exit 1
+    fi
+fi
+
+log "Salt has been installed!"
+trap - EXIT
+