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Top Forums UNIX for Advanced & Expert Users CentOS7 restoring file capabilities Post 303025691 by rbatte1 on Friday 9th of November 2018 01:03:10 PM
Old 11-09-2018
CentOS7 restoring file capabilities

Quite an obscure question I think.

We have a rebuild process for remote sites that allows us to PXE rebuild a till (actually a PC with a touch screen and various fancy bits) running CentOS. The current CentOS5 tills work just fine with a tar image restore and some personalisation. Sadly, CentOS7 introduces file capabilities on some critical stuff, such as ping so on the original source till, getcap /usr/bin/ping gives us this:-
Code:
# getcap /usr/bin/ping
/usr/bin/ping = cap_net_admin,cap_net_raw+p

After a tar and restore, these are lost, so ordinary users cannot use ping, which is a shame because the the till believes it cannot post the sales information to the central servers. The actual till software is proprietary, so we can't get into that to change it.

Does anyone know how to take a file and all it's file capabilities so that it can be restored?

An alternate would be to use yum or rpm to either list before or re-apply the required capabilities after the recovery, but I can't find a way to do that either of these. At worst, I might have to use getcap in a massive loop to collect them all then apply them manually after recovery, but I'd rather use the appropriate tools to do it properly.


Does anyone have any suggestions?



Many thanks, in advance,
Robin
 

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dtc_install_centos(8)					      System Manager's Manual					     dtc_install_centos(8)

NAME
dtc_install_centos - bootstrap a CentOS install to use in a chroot or VM SYNOPSIS
dtc_install_centos <install root> <yum environment> DESCRIPTION
This shell script is part of the dtc-xen package, generally to be used by the dtc panel to install a new a Xen VPS server. This script is called by dtc_reinstall_os when the user chooses to install the CentOS operating system. How it works: it generates a temporary yum configuration in the yum environment directory, that directs yum to act inside the install root instead of in the base system; then it kindly requests yum to install the basesystem, centos-release and yum packages onto it. Yum then uses the configuration to download the required (usually, security-updated) packages and then perform the RPM installation process under the install root. It requires both RPM and yum. It does work under Debian (it was developed in Ubuntu first). It should also work on RPM-based systems without destroying the system-wide RPM and yum configurations. OPTION
<install root> Target directory where CentOS will be deployed. Must exist beforehand. <yum environment> Directory where yum will store the repository manifests and configuration. Will be automatically created. Cached RPMs and manifests will be left, as usual, in a directory var/cache/yum inside the install root. EXAMPLE
dtc_install_centos /root/yum /xen/13 This will setup the operating system in /xen/13, with the CentOS configuration folder in /root/yum. BUGS
It's limited to CentOS 5 at the moment. It must be run as root. Under some circumstances, the installation process itself may kill processes running on the host machine. The chroot yum does should be sufficient to avoid this, but we haven't been able, yet, to ascertain why this fails sometimes. SEE ALSO
dtc_reinstall_os(8) VERSION
This documentation describes dtc_install_os version 0.3.1. See http://www.gplhost.com/software-dtc-xen.html for updates. dtc_install_centos(8)
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