Add a --no-prompt flag to install quietly.

build/install-build-deps.sh

Index: build/install-build-deps.sh
===================================================================
--- build/install-build-deps.sh	(revision 132122)
+++ build/install-build-deps.sh	(working copy)
@@ -13,6 +13,7 @@
   echo "Options:"
   echo "--[no-]syms: enable or disable installation of debugging symbols"
   echo "--[no-]lib32: enable or disable installation of 32 bit libraries"
+  echo "--no-prompt: silently select standard options/defaults"
   echo "Script will prompt interactively if options not given."
   exit 1
 }
@@ -24,6 +25,11 @@
   --no-syms)                do_inst_syms=0;;
   --lib32)                  do_inst_lib32=1;;
   --no-lib32)               do_inst_lib32=0;;
+  --no-prompt)              do_default=1
+                            do_inst_syms=${do_inst_syms-0}
+                            do_inst_lib32=${do_inst_lib32-0}

[cmp, 2012/04/21 23:49:26]

Hi Peter,

I still think lines 29-30 should be removed. :)  I thought we agreed --no-prompt
would mean less *and* do less (rather than mean less and do more).  Like I
mentioned over IM, setting the lib32/syms defaults here doesn't lessen the work
someone maintaining the bots has to do, the work stays the same since they'll
need to juggle where to add --lib32, etc.  While leaving lines 29-30 has the
unfortunate side effect of conflating the --no-prompt flag with a prescription
that's not relevant to other users of --no-prompt.

I noticed the title+description still mentions --bot.  That should be updated to
mirror the updated purpose.

You're probably used to working in gerrit which auto-emails when a patch is
updated.  But rietveld doesn't do that, and so I didn't see in my email that
you'd updated this patch.  (I just happened to reload it to check.)  Just a
reminder to remember to press 'publish+mail' to ensure that I see your updates. 
Thanks.

+                            do_quietly="-qq --assume-yes"
+    ;;
   *) usage;;
   esac
   shift
@@ -122,6 +128,9 @@
 # The function will echo the user's selection followed by a newline character.
 # Users can abort the function by pressing CTRL-C. This will call "exit 1".
 yes_no() {
+  if [ 0 -ne "${do_default-0}" ] ; then
+    return $1
+  fi
   local c
   while :; do
     c="$(trap 'stty echo -iuclc icanon 2>/dev/null' EXIT INT TERM QUIT
@@ -180,7 +189,7 @@
 # Intentionally leaving $packages unquoted so it's more readable.
 echo "Packages required: " $packages
 echo
-new_list_cmd="sudo apt-get install --reinstall $(echo $packages)"
+new_list_cmd="sudo apt-get install --reinstall ${do_quietly-} $(echo $packages)"
 if new_list="$(yes n | LANG=C $new_list_cmd)"; then
   # We probably never hit this following line.
   echo "No missing packages, and the packages are up-to-date."
@@ -194,7 +203,7 @@
     echo "No missing packages, and the packages are up-to-date."
   else
     echo "Installing missing packages: $new_list."
-    sudo apt-get install ${new_list}
+    sudo apt-get install ${do_quietly-} ${new_list}
   fi
   echo
 else