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Description of problem: blkid writes to default cache file, even when directed to write elsewhere Version-Release number of selected component (if applicable): 2.17.2-12.9.el6_4.3 How reproducible: every time Steps to Reproduce: $ sudo rm /etc/blkid/blkid.tab* $ sudo blkid /dev/sda1 -w /dev/null -o value -s UUID <UUID> is printed $ cat /etc/blkid/blkid.tab <device DEVNO="0x0801" TIME="1378230067.254175" UUID="<UUID>" TYPE="ext4">/dev/sda1</device> Actual results: /etc/blkid/blkid.tab is created with a row for device requested Expected results: because -w /dev/null was specified, no cache should have been written Additional info: as a workaround, specifying -c /dev/null to not read the cache at all will prevent writing
This feature has never been implemented and the latest blkid versions (rhel7 and fedora) do not support -w at all. Maybe we can update RHEL6 blkid.8 man page to document this behaviour. I don't think it make sense to do anything else. Sorry.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2014-1545.html