Install: Options "-q" (quiet), "-n" (no pull), "-y" (non interactive)

Added several options to the `create-dev-env.sh` script to improve its
ability to be used by another script:

* -y -- non interactive mode (no prompt, proceed immediately)
* -n -- do not attempt to pull edx-platform
* -q -- be more quiet (removes info at beginning & end)

This will be used, in particular, for Vagrant provisioning.

scripts/create-dev-env.sh

@@ -49,8 +49,11 @@ usage() {
 
     Usage: $PROG [-c] [-v] [-h]
 
+            -y        non interactive mode (no prompt, proceed immediately)
             -c        compile scipy and numpy
+            -n        do not attempt to pull edx-platform
             -s        give access to global site-packages for virtualenv
+            -q        be more quiet (removes info at beginning & end)
             -v        set -x + spew
             -h        this
 
@@ -78,10 +81,11 @@ change_git_push_defaults() {
 
 clone_repos() {
 
-    change_git_push_defaults
-
     cd "$BASE"
 
+    if [[ ! $nopull ]]; then
+        change_git_push_defaults
+
         if [[ -d "$BASE/edx-platform/.git" ]]; then
             output "Pulling edx platform"
             cd "$BASE/edx-platform"
@@ -94,6 +98,7 @@ clone_repos() {
             fi
             git clone https://github.com/edx/edx-platform.git
         fi
+    fi
 }
 
 set_base_default() {  # if PROJECT_HOME not set
@@ -149,7 +154,7 @@ if [[ "x$VIRTUAL_ENV" != "x" ]]; then
 fi
 
 # Read arguments
-ARGS=$(getopt "cvhs" "$*")
+ARGS=$(getopt "cvhsynq" "$*")
 if [[ $? != 0 ]]; then
     usage
     exit 1
@@ -170,6 +175,18 @@ while true; do
             verbose=true
             shift
             ;;
+        -y)
+            noninteractive=true
+            shift
+            ;;
+        -q)
+            quiet=true
+            shift
+            ;;
+        -n)
+            nopull=true
+            shift
+            ;;
         -h)
             usage
             exit 0
@@ -181,7 +198,8 @@ while true; do
     esac
 done
 
-cat<<EO
+if [[ ! $quiet ]]; then
+    cat<<EO
 
   This script will setup a local edX environment, this
   includes
@@ -201,10 +219,13 @@ cat<<EO
   shell.
 
 EO
-info
-output "Press return to begin or control-C to abort"
-read dummy
+fi
+    info
 
+if [[ ! $noninteractive ]]; then
+    output "Press return to begin or control-C to abort"
+    read dummy
+fi
 
 # Log all stdout and stderr
 
@@ -225,6 +246,7 @@ case `uname -s` in
         distro=`lsb_release -cs`
         case $distro in
             wheezy|jessie|maya|olivia|nadia|precise|quantal) 
+                if [[ ! $noninteractive ]]; then
                     warning "
                             Debian support is not fully debugged. Assuming you have standard
                             development packages already working like scipy rvm, the 
@@ -236,8 +258,10 @@ case `uname -s` in
                             Press return to continue or control-C to abort"
 
                     read dummy
-                sudo apt-get install git ;;
+                fi
+                sudo apt-get install -yq git ;;  
             squeeze|lisa|katya|oneiric|natty|raring)
+                if [[ ! $noninteractive ]]; then
                     warning "
                               It seems like you're using $distro which has been deprecated.
                               While we don't technically support this release, the install
@@ -248,7 +272,8 @@ case `uname -s` in
 
                               Press return to continue or control-C to abort"
                     read dummy
-                sudo apt-get install git
+                fi
+                sudo apt-get install -yq git
                 ;; 
 
             *)
@@ -529,7 +554,8 @@ git config --global push.default current
 
 ### DONE
 
-cat<<END
+if [[ ! $quiet ]]; then
+    cat<<END
    Success!!
 
    To start using Django you will need to activate the local Python
@@ -567,4 +593,6 @@ cat<<END
 
 
 END
+fi
+
 exit 0