AlternC/install/upgrade_check.sh

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#!/bin/sh -e
# this script will look for upgrade scripts in
# /usr/share/alternc/install/upgrades and execute them based on the
# extension
#
# usage:
# $0 oldvers, where oldvers is the version of the package previously
# installed
#
# an upgrade file is considered only if its basename is a version
# number greater than the $oldvers argument
# remove version from filename by stripping the extension
strip_ext() {
echo $1 | sed 's/\.[^.]*$//'
}
# find the version from a filename by stripping everything but the extension
get_ext() {
echo $1 | sed 's/^.*\.\([^.]*\)$/\1/'
}
oldvers=$1
if [ -z "$oldvers" -o "$oldvers" = '<unknown>' ]; then
# this is not an upgrade
exit 0
fi
. /etc/alternc/local.sh
# the upgrade script we are considering
extensions="*.sql *.sh *.php"
cd /usr/share/alternc/install/upgrades
for file in $extensions
do
if [ -r $file ]; then
# the version in the filename
upvers=`strip_ext $file`
# the extension
ext=`get_ext $file`
if dpkg --compare-versions $upvers gt $oldvers; then
echo running upgrade script $file
# run the proper program to interpret the upgrade script
case "$ext" in
sql)
mysql -f -h $MYSQL_HOST -u $MYSQL_USER -p$MYSQL_PASS $MYSQL_DATABASE \
< $file || true
;;
php)
php -q $file || true
;;
sh)
sh $file || true
;;
esac
fi
fi
done