Forum: CFEngine Help
Subject: issue using PCRE regex to filter part of the line
Author: milindk
Link to topic: https://cfengine.com/forum/read.php?3,24600,24600#msg-24600
I want to append every kernel like in grub.conf with elevator=noop , but I want
to filter the lines from appending the elevator=noop if the line already
contains elevator keyword , the position of keyword may vary in the file
I tried using regex with lookback/lookahead options to filter out the lines
something similar to * (?!elevator=.*) * but not able to filter out lines
any other way I can achive this
sample file is
title Red Hat Enterprise Linux Server (2.6.18-274.3.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-274.3.1.el5 ro root=/dev/vg_root/lv_root
pci=bfsort crashkernel=128M@16M iommu=soft
initrd /initrd-2.6.18-274.3.1.el5.img
title Red Hat Enterprise Linux Server (2.6.18-194.32.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-194.32.1.el5 ro root=/dev/vg_root/lv_root
pci=bfsort crashkernel=128M@16M elevator=noop
initrd /initrd-2.6.18-194.32.1.el5.img
title Red Hat Enterprise Linux Server (2.6.18-194.32.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-234.32.1.el5 ro root=/dev/vg_root/lv_root
pci=bfsort elevator=deadline crashkernel=128M@16M
initrd /initrd-2.6.18-194.32.1.el5.img
title Red Hat Enterprise Linux Server (2.6.18-194.32.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-194.32.1.el5 ro root=/dev/vg_root/lv_root
pci=bfsort crashkernel=128M@16M
initrd /initrd-2.6.18-194.32.1.el5.img
In this example I do not want promise bundle to touch line with elevator=* but
only append the one that does not have elevator keyword
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