debian: preserve user options on upgrade

debian/changelog

@@ -6,6 +6,7 @@ shellinabox (2.15-1) UNRELEASED; urgency=medium
   * move lintian exception in d/shellinabox.lintian
   * change urls to new GitHub repos
   * Closing release coordination metabug (Closes: #785181)
+  * keep user preferences on upgrade (Closes: #786441)
 
  -- Alexandre Detiste <alexandre.detiste@gmail.com>  Tue, 12 May 2015 14:06:55 +0200
 

debian/rules

@@ -20,12 +20,11 @@ ENABLED=debian/shellinabox/etc/shellinabox/options-enabled
 override_dh_install:
 	dh_install
 	install -D -m644 shellinabox/black-on-white.css "$(AVAILABLE)/00+Black on White.css"
-	install -D -m644 shellinabox/white-on-black.css "$(AVAILABLE)/00_White on Black.css"
+	install -D -m644 shellinabox/white-on-black.css "$(AVAILABLE)/00_White On Black.css"
 	install -D -m644 shellinabox/color.css          "$(AVAILABLE)/01+Color Terminal.css"
 	install -D -m644 shellinabox/monochrome.css     "$(AVAILABLE)/01_Monochrome.css"
 	install -D -m644 debian/README.available        "$(AVAILABLE)/README"
 	install -D -m644 debian/README.enabled          "$(ENABLED)/README"
-	cd "$(ENABLED)" && ln -s ../options-available/*.css .
 
 	# info duplicated in debian/copyright
 	# and /usr/share/common-licenses/GPL-2

debian/shellinabox.postinst

@@ -29,6 +29,16 @@ case "$1" in
 	# can write the certificate even when the daemon has given-up
 	# root privileges.
 #      chown shellinabox:shellinabox /var/lib/shellinabox
+
+      # new install, enable all options
+      if [ -z "$2" ]; then
+         (cd /etc/shellinabox/options-enabled; ln -s ../options-available/*.css .)
+      # upgrade from <= v2.14, re-enable saved options
+      elif [ -d /etc/shellinabox/options-enabled-save ]; then
+         mv /etc/shellinabox/options-enabled-save/*.css /etc/shellinabox/options-enabled
+         rm -r /etc/shellinabox/options-enabled-save
+      fi
+      # future upgrades: no-op
     ;;
 
     abort-upgrade|abort-remove|abort-deconfigure)

debian/shellinabox.postrm

@@ -33,6 +33,7 @@ case "$1" in
         deluser  --quiet --system shellinabox > /dev/null || true
         delgroup --quiet --system shellinabox > /dev/null || true
 	[ ! -d "$d" ] || rmdir "$d" || true    # deluser can't do this for /var
+	rm -rf "/etc/shellinabox/options-enabled"
 	exit 0
     ;;
 esac

debian/shellinabox.preinst

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+set -e
+
+# summary of how this script can be called:
+#        * <new-preinst> `install'
+#        * <new-preinst> `install' <old-version>
+#        * <new-preinst> `upgrade' <old-version>
+#        * <old-preinst> `abort-upgrade' <new-version>
+# for details, see http://www.debian.org/doc/debian-policy/ or
+# the debian-policy package
+
+case "$1" in
+    upgrade)
+	# save old configuration
+	test -d /etc/shellinabox/options-enabled || exit 0
+	if dpkg --compare-versions "$2" le "2.14-1"; then
+		mkdir -p /etc/shellinabox/options-enabled-save
+		cp -a /etc/shellinabox/options-enabled/*.css /etc/shellinabox/options-enabled-save
+	fi
+    ;;
+
+    install|abort-upgrade)
+    ;;
+
+    *)
+        echo "preinst called with unknown argument \`$1'" >&2
+        exit 1
+    ;;
+esac
+
+#DEBHELPER#