make a bash function to use everywhere we apt-get-install (`DEBIAN_FRONTEND=noninteractive apt-get -qq -y `)

ensures the output is quiet

scripts/dkim.sh

@@ -4,8 +4,10 @@
 # After this, you'll still need to run dns_update.sh to get the DKIM
 # signature in the DNS zones.
 
+source scripts/functions.sh # load our functions
+
 # Install DKIM
-apt-get install -q -y opendkim opendkim-tools
+apt_install opendkim opendkim-tools
 
 # Make sure configuration directories exist.
 mkdir -p /etc/opendkim;

scripts/dns.sh

@@ -7,6 +7,8 @@
 #
 # This script will turn on DNS for $PUBLIC_HOSTNAME.
 
+source scripts/functions.sh # load our functions
+
 # Install nsd, our DNS server software.
 
 # ...but first, we have to create the user because the 
@@ -20,7 +22,7 @@ fi
 
 # Okay now install the package.
 
-apt-get -qq -y install nsd
+apt_install nsd
 
 # Prepare nsd's configuration.
 

scripts/functions.sh

@@ -0,0 +1,21 @@
+function apt_install {
+	# Report any packages already installed.
+	PACKAGES=$@
+	TO_INSTALL=""
+	for pkg in $PACKAGES; do
+		if dpkg -s $pkg 2>/dev/null | grep "^Status: install ok installed" > /dev/null; then
+			echo $pkg is already installed \(`dpkg -s $pkg | grep ^Version: | sed -e "s/.*: //"`\)
+		else
+			TO_INSTALL="$TO_INSTALL""$pkg "
+		fi
+	done
+
+	# List the packages about to be installed.
+	if [[ ! -z "$TO_INSTALL" ]]; then
+		echo installing $TO_INSTALL...
+	fi
+
+	# 'DEBIAN_FRONTEND=noninteractive' is to prevent dbconfig-common from asking you questions.
+	DEBIAN_FRONTEND=noninteractive apt-get -qq -y install $PACKAGES > /dev/null;
+}
+

scripts/mail.sh

@@ -12,9 +12,10 @@
 
 # Install packages.
 
+source scripts/functions.sh # load our functions
 source /etc/mailinabox.conf # load global vars
 
-DEBIAN_FRONTEND=noninteractive apt-get -q -y install \
+apt_install \
 	postfix postgrey \
 	dovecot-core dovecot-imapd dovecot-lmtpd dovecot-sqlite sqlite3 \
 	openssl

scripts/spamassassin.sh

@@ -9,8 +9,10 @@
 # plugin. The tools/mail.py tool creates the necessary sieve script for each mail
 # user when the mail user is created.
 
+source scripts/functions.sh # load our functions
+
 # Install packages.
-apt-get -q -y install spampd razor pyzor dovecot-sieve dovecot-antispam
+apt_install spampd razor pyzor dovecot-sieve dovecot-antispam
 
 # Allow spamassassin to download new rules.
 tools/editconf.py /etc/default/spamassassin \

scripts/system.sh

@@ -1,10 +1,12 @@
+source scripts/functions.sh # load our functions
+
 # Base system configuration.
 
 apt-get -q -q update
 apt-get -q -y upgrade
 
 # Install openssh-server to ensure that the end result is consistent across all Mail-in-a-Boxes.
-apt-get -q -y install openssh-server
+apt_install openssh-server
 
 # Check that SSH login with password is disabled. Stop if it's enabled.
 if grep -q "^PasswordAuthentication yes" /etc/ssh/sshd_config \
@@ -18,7 +20,7 @@ if grep -q "^PasswordAuthentication yes" /etc/ssh/sshd_config \
         exit
 fi
 
-apt-get -q -y install python3
+apt_install python3
 
 # Turn on basic services:
 #
@@ -28,11 +30,11 @@ apt-get -q -y install python3
 #
 # These services don't need further configuration and are started immediately after installation.
 
-apt-get -q -y install ntp fail2ban
+apt_install ntp fail2ban
 
 # Turn on the firewall. First allow incoming SSH, then turn on the firewall.
 # Other ports will be opened at the point where we set up those services.
-apt-get -q -y install ufw;
+apt_install ufw
 ufw allow ssh;
 ufw --force enable;
 

scripts/web.sh

@@ -1,12 +1,14 @@
 # HTTP: Turn on a web server serving static files
 #################################################
 
+source scripts/functions.sh # load our functions
+
 # Remove Apache before installing Nginx. Apache may leave
 # some unwanted configuration files around (e.g. a ufw
 # application config), so purge the packages.
 apt-get purge -q -y apache2 apache2.2-common
 
-apt-get install -q -y nginx php5-cgi
+apt_install nginx php5-cgi
 
 rm -f /etc/nginx/sites-enabled/default
 

scripts/webmail.sh

@@ -1,6 +1,7 @@
 # Webmail: Using roundcube
 ##########################
 
+source scripts/functions.sh # load our functions
 source /etc/mailinabox.conf # load global vars
 
 # Ubuntu's roundcube-core has a dependency on Apache & MySQL, which we don't want, so we can't
@@ -8,10 +9,9 @@ source /etc/mailinabox.conf # load global vars
 # dependencies of roundcube that we know we need, and then we'll manually install debs for the
 # roundcube version we want from Debian.
 #
-# 'DEBIAN_FRONTEND=noninteractive' is to prevent dbconfig-common from asking you questions.
 # The dependencies are from 'apt-cache showpkg roundcube-core'.
 
-DEBIAN_FRONTEND=noninteractive apt-get -q -q -y install \
+apt_install \
 	dbconfig-common \
 	php5 php5-sqlite php5-mcrypt php5-intl php5-json php5-common php-auth php-net-smtp php-net-socket php-net-sieve php-mail-mime php-crypt-gpg php5-gd php5-pspell \
 	tinymce libjs-jquery libjs-jquery-mousewheel libmagic1