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Top Forums UNIX for Advanced & Expert Users CentOS7 restoring file capabilities Post 303026288 by rbatte1 on Friday 23rd of November 2018 11:33:28 AM
Old 11-23-2018
Hello Peasant,

Sorry for the delay, I've been in court for two weeks Smilie . Don't worry, it was only jury service Smilie

Yes! This works wonderfully. I've trimmed it down so finding that the necessary part was just --xattrs-include='security.capability' so I can now prove it with:-
Code:
# tar -cvpzf - --xattrs-include='security.capability' /usr/bin/ping | ( cd /tmp && tar -xzvp --xattrs-include='security.capability' -f - )
tar: Removing leading `/' from member names
/usr/bin/ping
usr/bin/ping

# getcap /tmp/usr/bin/ping
/tmp/usr/bin/ping = cap_net_admin,cap_net_raw+p

This command now works perfectly and I can incorporate it into our kickstart called recovery process with a minor adjustment to the procedure to build the image.

Fantastic.

One wonders why they create so many additional attributes for files and then the default doesn't recover them. I presume it is so that it you try to extract to a server that tar is not expecting them, you don't get horrible errors, but it is frustrating. Oh well Smilie


Thank you very much once again,
Robin
This User Gave Thanks to rbatte1 For This Post:
 

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chroot(1M)						  System Administration Commands						chroot(1M)

NAME
chroot - change root directory for a command SYNOPSIS
/usr/sbin/chroot newroot command DESCRIPTION
The chroot utility causes command to be executed relative to newroot. The meaning of any initial slashes (/) in the path names is changed to newroot for command and any of its child processes. Upon execution, the initial working directory is newroot. Notice that redirecting the output of command to a file, chroot newroot command >x will create the file x relative to the original root of command, not the new one. The new root path name is always relative to the current root. Even if a chroot is currently in effect, the newroot argument is relative to the current root of the running process. This command can be run only by the super-user. RETURN VALUES
The exit status of chroot is the return value of command. EXAMPLES
Example 1: Using the chroot Utility The chroot utility provides an easy way to extract tar files (see tar(1)) written with absolute filenames to a different location. It is necessary to copy the shared libraries used by tar (see ldd(1)) to the newroot filesystem. example# mkdir /tmp/lib; cd /lib example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1 libsec.so.1 /tmp/lib example# cp /usr/bin/tar /tmp example# dd if=/dev/rmt/0 | chroot /tmp tar xvf - ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
cd(1), tar(1), chroot(2), ttyname(3C), attributes(5) NOTES
Exercise extreme caution when referencing device files in the new root file system. References by routines such as ttyname(3C) to stdin, stdout, and stderr will find that the device associated with the file descriptor is unknown after chroot is run. SunOS 5.10 15 Dec 2003 chroot(1M)
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