zulip/scripts/setup/terminate-psql-sessions

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#!/usr/bin/env bash
set -e
vergte() {
[ "$1" = "$(echo -e "$1\\n$2" | sort -V | tail -n1)" ]
}
DEFAULT_USER="postgres"
if [ "$(uname)" = "OpenBSD" ]; then
DEFAULT_USER="_postgresql"
fi
cd /
if [ "$EUID" -eq 0 ]; then
version=$(sudo -u "$DEFAULT_USER" sh -c 'psql -A -t -d postgres -c "show server_version"')
else
version=$(psql -A -t -d postgres -c "show server_version")
fi
major=$(echo "$version" | cut -d. -f1,2)
username=$1
shift
tables=$(echo "'$*'" | sed "s/ /','/g")
if vergte "$major" "9.2"; then
pidname="pid"
else
pidname="procpid"
fi
if [ "$EUID" -eq 0 ]; then
sudo -u "$DEFAULT_USER" sh -c "psql postgres '$DEFAULT_USER'" <<EOF
SELECT pg_terminate_backend($pidname) FROM pg_stat_activity WHERE datname IN ($tables);
EOF
else
psql -h localhost postgres "$username" <<EOF
SELECT pg_terminate_backend($pidname) FROM pg_stat_activity WHERE datname IN ($tables);
EOF
fi