preinst is in mariadb-common 1:10.1.29-6.
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 13 14 15 16 17 18 | #!/bin/sh
set -e
if [ "$1" = "install" ] || [ "$1" = "upgrade" ]; then
if dpkg --compare-versions "$2" lt-nl "10.0.20-3~" ; then
# revert fallback my.cnf symlink setup performed by mariadb-common
# from 10.0.17-1~exp2 upto 10.0.20-2
if [ -L /etc/mysql/my.cnf ] && [ -f /etc/mysql/my.cnf.old ]; then
if [ "$(readlink /etc/mysql/my.cnf)" = "mariadb.cnf" ]; then
echo "Reverting my.cnf -> mariadb.cnf symlink setup by mariadb-common"
rm /etc/mysql/my.cnf
mv /etc/mysql/my.cnf.old /etc/mysql/my.cnf
fi
fi
fi
fi
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