Getting package versions via dpkg-query on startup is very expensive

[Paweł Stołowski]

The plugin executes dpkg-query on startup to get version numbers of 3 important packages (scopes-api, unity8, self). They are then passed to Smart Scopes Server with every request. Using dpkg-query at this stage seems to have big impact on startup time of the Dash (and phone).

Michael Vogt suggested a simple postinst/postrm script that is executed for all 3 packages to put & update their versions via a flat text file, e.g.

::::::::::::::
debian/postinst
::::::::::::::
#!/bin/sh

set -e

if [ "$1" = "configure" ]; then
   dpkg-query -W -f'${Version}' $DPKG_MAINTSCRIPT_PACKAGE \
              > /var/lib/unity-scopes-shell/$DPKG_MAINTSCRIPT_PACKAGE
fi::::::::::::::
debian/postrm
::::::::::::::
#!/bin/sh

set -e

rm -f /var/lib/unity-scopes-shell/$DPKG_MAINTSCRIPT_PACKAGE