postinst is in nginx-extras 1.4.6-1ubuntu3.
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 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | #!/bin/sh
set -e
case "$1" in
abort-upgrade|abort-remove|abort-deconfigure|configure)
;;
*)
echo "postinst called with unknown argument \`$1'" >&2
exit 1
;;
esac
if [ -x /etc/init.d/nginx ]; then
if [ -f /run/nginx.pid ] && pidof /usr/sbin/nginx >/dev/null; then
NGX_PID=`cat /run/nginx.pid`
if kill -s USR2 $NGX_PID 2>/dev/null; then
while [ ! -s /run/nginx.pid.oldbin ] || [ ! -s /run/nginx.pid ]; do
cnt=`expr $cnt + 1`
if [ $cnt -gt 10 ]; then
kill -s KILL $NGX_PID
invoke-rc.d nginx start
exit 0
fi
sleep 1
done
NGX_OLD_PID=`cat /run/nginx.pid.oldbin`
kill -s QUIT $NGX_OLD_PID
fi
else
invoke-rc.d nginx start || exit $?
fi
fi
exit 0
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