Top Forums UNIX for Advanced & Expert Users CentOS7 restoring file capabilities Post 303025724 by rbatte1 on Saturday 10th of November 2018 12:42:02 PM
Old 11-10-2018
Yes, we'd tried that without success. I hadn't considered the other file attributes options though. Sadly, it seems no better. A simple test just on CentOS7 gives me this:-
Code:
# tar -cvpzf - --xattrs --acl --selinux /usr/bin/ping | (cd /tmp;tar -xzvp --xattrs --acl --selinux  -f -)
tar: Removing leading `/' from member names
/usr/bin/ping
usr/bin/ping
# getcap -v /usr/bin/ping /tmp/usr/bin/ping
/usr/bin/ping = cap_net_admin,cap_net_raw+p
/tmp/usr/bin/ping

Am I doing something daft? At worst I've scanned all local files and collected the capabilities into a file that then is part of the tarball. On recovery I can apply them within my kickstart file. It's just more steps to wory about.

I have found that simply copying a file loses the capabilities, one has to cp --preserve=xattr source target Maybe I don't understand where these are stored. Maybe I don't need to know, just understand the rules I need to follow Smilie

I know I can achieve it with rsync but I can't neatly use that when doing a PXE recovery and I'd have to get the files out to all the remote locations individually too, which would be a nightmare.

I will keep digging. Any other suggestions to explore very welcome.



Kind regards,
Robin
 

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FILECAP:(8)						  System Administration Utilities					       FILECAP:(8)

NAME
filecap - a program to see capabilities SYNOPSIS
filecap [ -a | -d | /dir | /dir/file [cap1 cap2 ...] ] DESCRIPTION
filecap is a program that prints out a report of programs with file based capabilities. If a file is not in the report or there is no report at all, no capabilities were found. For expedience, the default is to check only the directories in the PATH environmental variable. If the -a command line option is given, then all directories will be checked. If a directory is passed, it will recursively check that directory. If a path to a file is given, it will only check that file. If the path to the file includes capabilities, then they are written to the file. OPTIONS
-a This tells the program to show all capabilities starting from the / directory. Normally the PATH environmental variable is used to show you capabilities on files you are likely to execute. -d This dumps all capabilities for reference. EXAMPLES
To check file capabilities in $PATH: filecap To check file capabilities of whole system: filecap -a To check file capabilities recursively in a directory: filecap /usr To check file capabilities of a specific program: filecap /bin/passwd To list all possible capabilities: filecap -d To set a file capability on a specific program: filecap /bin/ping net_raw net_admin SEE ALSO
pscap(8), netcap(8), capabilities(7). AUTHOR
Steve Grubb Red Hat March 2009 FILECAP:(8)

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