<div dir="ltr">cpio archives can be trivially appended to— one place that this is really nice is for overlaying a preseed file onto a debian-installer FS image.<div><br></div><div>Mike</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 14 September 2015 at 21:50, Khalid Baheyeldin <span dir="ltr"><<a href="mailto:kb@2bits.com" target="_blank">kb@2bits.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">The cpio tool provides a way for verifying backups, but it is a<br>
two-pass thing and a prerequisite.<br>
<br>
For this to work, you have to use the "crc" output format for the archive:<br>
<br>
cpio -o -H crc .... > archive<br>
<br>
cpio -i --only-verify-crc < archive<br>
<br>
>From the manual for this last option: "When reading a CRC format<br>
archive, only verify the CRC’s of each file in the archive, don’t<br>
actually extract the files"<br>
<br>
cpio is more complicated than tar and has a multitude of output<br>
formats, and that is probably why it never caught on like tar.<br>
--<br>
Khalid M. Baheyeldin<br>
<a href="http://2bits.com" rel="noreferrer" target="_blank">2bits.com</a>, Inc.<br>
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</blockquote></div><br></div>