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Script to purge varnish cache by URL, by regexp or all of it (for Debian)
#!/bin/sh
# purge-cache: Script to purge varnish cache. Defaults are defined in
# /etc/default/varnish.
#
# Cosimo <cosimo@cpan.org>
# Based on reload-vcl, by Stig Sandbeck Mathisen <ssm at debian dot org>
# Settings
defaults=/etc/default/varnish
# Paths
varnishadm=/usr/bin/varnishadm
date=/bin/date
tempfile=/bin/tempfile
# Messages
# msg_no_varnishadm: varnishadm
msg_no_varnishadm="Error: Cannot execute %s\n"
msg_no_management="Error: \$DAEMON_OPTS must contain '-T hostname:port'\n"
# msg_defaults_not_readable: defaults
msg_defaults_not_readable="Error: %s is not readable\n"
# msg_defaults_not_there: defaults
msg_defaults_not_there="Error: %s does not exist\n"
msg_usage="Usage: $0 [-h][-q][-u <url>|-r <regex>|-a]\n\t-h\tdisplay help\n\t-q\tbe quiet\n\t-u\tpurge by exact (relative) url (ex.: /en/products/)\n\t-r\tpurge objects with URL matching a regex (ex.: ^/blogs/)\n\t-a\tpurge all objects from cache\n"
msg_purge_failed="Error: purge command failed\n"
# msg_purge_url: url
msg_purge_url="Purging objects by exact url: %s\n"
# msg_purge_regex: regex
msg_purge_regex="Purging objects with URL matching regex: %s\n"
msg_purge_all="Purging all cache\n"
msg_purge_ok="Purge command successful\n"
# Load defaults file
if [ -f "$defaults" ]
then
if [ -r "$defaults" ]
then
. "$defaults"
else
printf >&2 "$msg_defaults_not_readable" $defaults
exit 1
fi
else
printf >&2 "$msg_defaults_not_there" $defaults
exit 1
fi
# parse command line arguments
while getopts hqu:r:a flag
do
case $flag in
h)
printf >&2 "$msg_usage"
exit 0
;;
u)
purge_method=url
url="$OPTARG"
;;
r)
purge_method=regex
regex="$OPTARG"
;;
a)
purge_method=all
;;
q)
quiet=1
;;
*)
printf >&2 "$msg_usage\n"
exit 1
;;
esac
done
# Parse $DAEMON_OPTS (options must be kept in sync with varnishd).
# Extract the -f and the -T option, and (try to) ensure that the
# management interface is on the form hostname:address
OPTIND=1
while getopts a:b:dFf:g:h:l:n:P:p:s:T:t:u:Vw: flag $DAEMON_OPTS
do
case $flag in
f)
if [ -f "$OPTARG" ]; then
vcl_file="$OPTARG"
fi
;;
T)
if [ -n "$OPTARG" -a "$OPTARG" != "${OPTARG%%:*}" ]
then
mgmt_interface="$OPTARG"
fi
;;
esac
done
# Sanity checks
if [ ! -x "$varnishadm" ]
then
printf >&2 "$msg_no_varnishadm" $varnishadm
exit 1
fi
if [ -z "$mgmt_interface" ]
then
printf >&2 "$msg_no_management"
exit 1
fi
logfile=$($tempfile)
purge_command="vcl.list"
# Now run the purge command against the admin interface
if [[ $purge_method = "url" ]]
then
purge_command="purge req.url == $url"
printf >&2 "$msg_purge_url" $url | grep -v "^$" > $logfile
else
if [[ $purge_method = "regex" ]]
then
purge_command="purge.url $regex"
printf >&2 "$msg_purge_regex" $regex | grep -v "^$" > $logfile
else
if [[ $purge_method = "all" ]]
then
purge_command="purge.url ."
printf >&2 "$msg_purge_all" | grep -v "^$" > $logfile
fi
fi
fi
# For some reason, using:
#
# fi | grep -v "^$" > $logfile
#
# results in purge_command assignment being wiped out
# at the end of the block??
if [ -z "$purge_command" ]
then
printf >&2 "$msg_usage\n"
exit 1
fi
# echo "cmd: $varnishadm -T $mgmt_interface $purge_command"
if $varnishadm -T $mgmt_interface $purge_command
then
printf >&2 "$msg_purge_ok"
else
printf >&2 "$msg_purge_failed"
exitstatus=1
fi | grep -v "^$" > $logfile
# Blather
if [ -z "${quiet}" -o -n "$exitstatus" ]
then
cat >&2 $logfile
fi
# Cleanup
rm -f $logfile
exit $exitstatus
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