move more of start.sh into questions.sh to keep start.sh cleaner and...

move more of start.sh into questions.sh to keep start.sh cleaner and encapsulate all of the variable setting in a single script

Based on https://github.com/Toilal/mailinabox/commit/5b23a06a7410e4530a56fd6200a6c46c3c6ea9b6.

setup/questions.sh

@@ -196,3 +196,44 @@ if [ -z "$CSR_COUNTRY" ]; then
 		exit
 	fi
 fi
+
+# Automatic configuration, e.g. as used in our Vagrant configuration.
+if [ "$PUBLIC_IP" = "auto" ]; then
+	# Use a public API to get our public IP address, or fall back to local network configuration.
+	PUBLIC_IP=$(get_publicip_from_web_service 4 || get_default_privateip 4)
+fi
+if [ "$PUBLIC_IPV6" = "auto" ]; then
+	# Use a public API to get our public IPv6 address, or fall back to local network configuration.
+	PUBLIC_IPV6=$(get_publicip_from_web_service 6 || get_default_privateip 6)
+fi
+if [ "$PRIMARY_HOSTNAME" = "auto-easy" ]; then
+	# Generate a probably-unique subdomain under our justtesting.email domain.
+	PRIMARY_HOSTNAME=`echo $PUBLIC_IP | sha1sum | cut -c1-5`.justtesting.email
+fi
+
+# Set STORAGE_USER and STORAGE_ROOT to default values (user-data and /home/user-data), unless
+# we've already got those values from a previous run.
+if [ -z "$STORAGE_USER" ]; then
+	STORAGE_USER=$([[ -z "$DEFAULT_STORAGE_USER" ]] && echo "user-data" || echo "$DEFAULT_STORAGE_USER")
+fi
+if [ -z "$STORAGE_ROOT" ]; then
+	STORAGE_ROOT=$([[ -z "$DEFAULT_STORAGE_ROOT" ]] && echo "/home/$STORAGE_USER" || echo "$DEFAULT_STORAGE_ROOT")
+fi
+
+# Show the configuration, since the user may have not entered it manually.
+echo
+echo "Primary Hostname: $PRIMARY_HOSTNAME"
+echo "Public IP Address: $PUBLIC_IP"
+if [ ! -z "$PUBLIC_IPV6" ]; then
+	echo "Public IPv6 Address: $PUBLIC_IPV6"
+fi
+if [ "$PRIVATE_IP" != "$PUBLIC_IP" ]; then
+	echo "Private IP Address: $PRIVATE_IP"
+fi
+if [ "$PRIVATE_IPV6" != "$PUBLIC_IPV6" ]; then
+	echo "Private IPv6 Address: $PRIVATE_IPV6"
+fi
+if [ -f .git ]; then
+	echo "Mail-in-a-Box Version: " $(git describe)
+fi
+echo

setup/start.sh

@@ -47,71 +47,26 @@ chmod +x /usr/local/bin/mailinabox
 
 # Ask the user for the PRIMARY_HOSTNAME, PUBLIC_IP, PUBLIC_IPV6, and CSR_COUNTRY
 # if values have not already been set in environment variables. When running
-# non-interactively, be sure to set values for all!
+# non-interactively, be sure to set values for all! Also sets STORAGE_USER and
+# STORAGE_ROOT.
 source setup/questions.sh
 
-# Automatic configuration, e.g. as used in our Vagrant configuration.
-if [ "$PUBLIC_IP" = "auto" ]; then
-	# Use a public API to get our public IP address, or fall back to local network configuration.
-	PUBLIC_IP=$(get_publicip_from_web_service 4 || get_default_privateip 4)
-fi
-if [ "$PUBLIC_IPV6" = "auto" ]; then
-	# Use a public API to get our public IPv6 address, or fall back to local network configuration.
-	PUBLIC_IPV6=$(get_publicip_from_web_service 6 || get_default_privateip 6)
-fi
-if [ "$PRIMARY_HOSTNAME" = "auto-easy" ]; then
-	# Generate a probably-unique subdomain under our justtesting.email domain.
-	PRIMARY_HOSTNAME=`echo $PUBLIC_IP | sha1sum | cut -c1-5`.justtesting.email
-fi
-
-# Show the configuration, since the user may have not entered it manually.
-echo
-echo "Primary Hostname: $PRIMARY_HOSTNAME"
-echo "Public IP Address: $PUBLIC_IP"
-if [ ! -z "$PUBLIC_IPV6" ]; then
-	echo "Public IPv6 Address: $PUBLIC_IPV6"
-fi
-if [ "$PRIVATE_IP" != "$PUBLIC_IP" ]; then
-	echo "Private IP Address: $PRIVATE_IP"
-fi
-if [ "$PRIVATE_IPV6" != "$PUBLIC_IPV6" ]; then
-	echo "Private IPv6 Address: $PRIVATE_IPV6"
-fi
-if [ -f .git ]; then
-	echo "Mail-in-a-Box Version: " $(git describe)
-fi
-echo
-
 # Run some network checks to make sure setup on this machine makes sense.
 if [ -z "$SKIP_NETWORK_CHECKS" ]; then
-	. setup/network-checks.sh
-fi
-
-# For the first time (if the config file (/etc/mailinabox.conf) not exists):
-# Create the user named "user-data" and store all persistent user
-# data (mailboxes, etc.) in that user's home directory.
-#
-# If the config file exists:
-# Apply the existing configuration options for STORAGE_USER/ROOT
-if [ -z "$STORAGE_USER" ]; then
-	STORAGE_USER=$([[ -z "$DEFAULT_STORAGE_USER" ]] && echo "user-data" || echo "$DEFAULT_STORAGE_USER")
+	source setup/network-checks.sh
 fi
 
-if [ -z "$STORAGE_ROOT" ]; then
-	STORAGE_ROOT=$([[ -z "$DEFAULT_STORAGE_ROOT" ]] && echo "/home/$STORAGE_USER" || echo "$DEFAULT_STORAGE_ROOT")
-fi
-
-# Create the STORAGE_USER if it not exists
+# Create the STORAGE_USER and STORAGE_ROOT directory if they don't already exist.
+# If the STORAGE_ROOT is missing the mailinabox.version file that lists a
+# migration (schema) number for the files stored there, assume this is a fresh
+# installation to that directory and write the file to contain the current
+# migration number for this version of Mail-in-a-Box.
 if ! id -u $STORAGE_USER >/dev/null 2>&1; then
 	useradd -m $STORAGE_USER
 fi
-
-# Create the STORAGE_ROOT if it not exists
 if [ ! -d $STORAGE_ROOT ]; then
 	mkdir -p $STORAGE_ROOT
 fi
-
-# Create mailinabox.version file if not exists
 if [ ! -f $STORAGE_ROOT/mailinabox.version ]; then
 	echo $(setup/migrate.py --current) > $STORAGE_ROOT/mailinabox.version
 	chown $STORAGE_USER.$STORAGE_USER $STORAGE_ROOT/mailinabox.version