preinst is in migrationtools 47-8ubuntu2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | #!/bin/sh
set -e
if [ "$1" = "upgrade" ]; then
if dpkg --compare-versions "$2" lt 47-8ubuntu2 ; then
# migrate_common.ph was a stale link, should be removed to
# ensure it's replaced on upgrade
if [ -L /etc/migrationtools/migrate_common.ph ]; then
rm -f /etc/migrationtools/migrate_common.ph
fi
fi
fi
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