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-# common/manifests/defines/replace.pp -- replace a pattern in a file with a string
-# Copyright (C) 2007 David Schmitt <david@schmitt.edv-bus.at>
-# See LICENSE for the full license granted to you.
-
-# A hack to replace all occurrences of a regular expression in a file with a
-# specified string. Sometimes it can be less effort to replace only a single
-# value in a huge config file instead of creating a template out of it. Still,
-# creating a template is often better than this hack.
-#
-# This define uses perl regular expressions.
-#
-# Use this only for very trivial stuff. Usually replacing the whole file is a
-# more stable solution with less maintenance headaches afterwards.
-#
-# Usage:
-#
-# replace { description:
-# file => "filename",
-# pattern => "regexp",
-# replacement => "replacement"
-#
-# Example:
-# To replace the current port in /etc/munin/munin-node.conf
-# with a new port, but only disturbing the file when needed:
-#
-# replace { set_munin_node_port:
-# file => "/etc/munin/munin-node.conf",
-# pattern => "^port (?!$port)[0-9]*",
-# replacement => "port $port"
-# }
-
-define replace($file, $pattern, $replacement) {
- $pattern_no_slashes = slash_escape($pattern)
- $replacement_no_slashes = slash_escape($replacement)
- exec { "replace_${pattern}_${file}":
- command => "/usr/bin/perl -pi -e 's/${pattern_no_slashes}/${replacement_no_slashes}/' '${file}'",
- onlyif => "/usr/bin/perl -ne 'BEGIN { \$ret = 1; } \$ret = 0 if /${pattern_no_slashes}/ && ! /\\Q${replacement_no_slashes}\\E/; END { exit \$ret; }' '${file}'",
- alias => "exec_$name",
- }
-}