Initial support for Linux installers. Currently just an amd64 .deb, but more ...

installer/linux/debian_amd64/prerm

+#!/bin/sh
+# prerm script for google-o3d
+
+set -e
+
+# Find out which Debian-derived distro this is.
+. /etc/lsb-release
+if test "$DISTRIB_ID" = Ubuntu; then
+  distro=Ubuntu
+else
+  distro=Other
+fi
+
+# The nspluginwrapper package in Ubuntu behaves differently from upstream. By
+# default it installs the wrapped plugin to multiple directories. -n must be
+# used to suppress this. Additionally, when using -n the directory that it
+# installs to is still different. Hence the logic here.
+if test $distro = Ubuntu; then
+  WRAPPED_PLUGIN_PATH="/usr/lib/nspluginwrapper/plugins/npwrapper.libnpo3dautoplugin.so"
+  APPS="iceape iceweasel mozilla firefox xulrunner midbrowser xulrunner-addons"
+else
+  WRAPPED_PLUGIN_PATH="/usr/lib/mozilla/plugins/npwrapper.libnpo3dautoplugin.so"
+  APPS="iceape iceweasel firefox xulrunner midbrowser xulrunner-addons"
+fi
+
+case "$1" in
+  remove|upgrade|deconfigure)
+    # Remove the symlinks.
+    for app in $APPS; do
+      # Don't fail if it happens to not be there. User might have removed it
+      # themselves, for example.
+      rm -f /usr/lib/$app/plugins/npwrapper.libnpo3dautoplugin.so
+    done
+    if ! which nspluginwrapper 2>&1 > /dev/null; then
+      echo "Warning: nspluginwrapper not found. Some files may be left over." >&2
+    else
+      # Remove the wrapper. Again, don't fail.
+      nspluginwrapper -r $WRAPPED_PLUGIN_PATH || { echo "Warning: Unable to remove wrapped plugin. Some files may be left over." >&2; }
+    fi
+  ;;
+
+  failed-upgrade)
+    # Executing "old-prerm upgrade" failed. This gets called to take over.
+    # If it succeeds, the upgrade continues and postinst is later called.
+    # We don't want users to get stuck on an old version, so we always continue
+    # the upgrade.
+    echo "Warning: continuing upgrade even though old version wasn't successfully deconfigured" >&2
+  ;;
+
+  *)
+    echo "prerm called with unknown argument \`$1'" >&2
+    exit 1
+  ;;
+esac
+
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
+#DEBHELPER#
+
+exit 0