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#!/bin/sh
new="$1"
old="$2"
pgver=${new%.*}
compare=$(apk version -t "$old" $pgver)
# check if we upgrade from earlier than $pgver and if it is running
if [ "$compare" != "<" ] || ! /etc/init.d/postgresql --quiet status; then
exit 0
fi
if [ -f /etc/conf.d/postgresql ]; then
. /etc/conf.d/postgresql
fi
cat <<EOF
* You are upgrading to postgres $pgver, which is not compatible with the running
* version. See: http://www.postgresql.org/docs/$pgver/static/upgrading.html
*
* The corresponding steps for Alpine Linux is:
*
* pg_dumpall -U ${PGUSER:-postgres} > dumpfile
* /etc/init.d/postgresql stop
* apk add -u postgresql
* /etc/init.d/postgresql setup
* /etc/init.d/postgresql start
* psql -U ${PGUSER:-postgres} -f dumpfile
*
EOF
exit 1
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