The recent rework changes how we detect hard links.
[OLD BEHAVIOR]
We trusted st_nlink and st_ino, reuse them without extra sanity
checks.
That behavior has problems handling cross mount-point or hard links out
of the rootdir cases.
[NEW BEHAVIOR]
The new refactored code will treat every inode, no matter if it's a
hardlink, as a new inode.
This means we will break the hard link detection, and every hard link
will be created as a different inode.
For the most common use case, like populating a rootfs, it's totally
fine.
[EXTRA WARNING]
But for cases where the user have extra hard links inside the rootdir,
output a warning just to inform the end user.
This will not cause any content difference, just breaking the hard links
into new inodes.
Signed-off-by: Qu Wenruo <wqu@suse.com>
27974edb4d