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Description of problem:
When the inode of a file with hardlinks is too large (e.g. on XFS), cpio creates an archive that unpacks to zero-length files

Version-Release number of selected component (if applicable):
cpio 2.10-12.el6_5


How reproducible:
Very, but I don't know the exact inode cutoff.


Steps to Reproduce:

mkdir cpiotest
echo foo > cpiotest/foo
ln cpiotest/foo cpiotest/bar
find cpiotest | cpio -o -H newc > test.cpio
mkdir unpack
cd unpack
cpio -i < ../test.cpio
ls -li cpiotest

Actual results:

If original bar and foo have inode 1257109924:
bar and foo, both 4 bytes and having the same inode

If original bar and foo have inode 2262282261:
bar and foo, both 0 bytes and having the same inode


Expected results:

If original bar and foo have any inode:
bar and foo, both 4 bytes and having the same inode


Additional info:

This looks to have been fixed by the cpio maintainers, see: 
http://lists.gnu.org/archive/html/bug-cpio/2010-02/msg00002.html

Hello Nathan, thanks for the report.  Yes - ino 2262282261 is bigger than
INT_MAX so your case seems to match the upstream fix.  Consider using other
archiving tools or formats (e.g. ustar) if possible.

If this issue is critical or in any way time sensitive, please raise a ticket
through your regular Red Hat support channels to make certain  it receives the
proper attention and prioritization to assure a timely resolution.

For information on how to contact the Red Hat production support team, please
visit:

  https://www.redhat.com/support/process/production/#howto

Pavel

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.

https://rhn.redhat.com/errata/RHBA-2017-0611.html