On Tue, Jun 21, 2016 at 04:59:39PM +0300, Yigal Korman wrote: > I have a question regarding this patch in util-linux: > "blkid: don't ignore info about partitions on non-formated devices" > (commit f8098e2b2c0a8a98ccb603f53dfba0cc05683a39) > > I wanted to know what was the trigger for this change? what's the reasoning > behind it? I guess inconsistency with man page: Note that low-level probing also returns information about partition table type (PTTYPE tag) and partitions (PART_ENTRY_* tags). .. and I'm not able to found if someone complained on mailing list. > Background: > I have an Linux automation script that formats a given partition and mounts > it. > In order to verify that the partition is empty (ie no other data exists > there) I've been using 'blkid -p <partition>; [[ $? != 2 ]] && fail". > Which stopped working correctly when I moved to Ubuntu 16.04. > I've tracked the issue to the patch mentioned above. > > To me this patch seems to counter blkid behavior - returning the partition > information when the given device is the partition doesn't describe what > the device contains. Yes, the patch seems pretty controversial. I'll think about revert. > The same way that if /dev/sda is part of LVM, then 'blkid -p /dev/sda' will > return the LVM information, but doing 'blkid -p /dev/mapper/vg-lv' will > return what's inside the logical volume and not the logical volume > information (and nothing if the empty). > > Do you have a suggestion for a different method for testing if a device is > empty? lsblk -n -o FSTYPE /dev/sda1 -- Karel Zak <kzak@xxxxxxxxxx> http://karelzak.blogspot.com -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
