As of Fedora 15, xz compression has changed - see http://lists.fedoraproject.org/pipermail/devel/2010-October/144651.html Versions of Fedora <= 14 continue to use the old compression, but everything after that (including Rawhide and the current Branched 15) will use the new compression. To use applydeltaiso successfully on a diso which goes from oldiso to newiso, the system must be using the compression corresponding to newiso. For example, a diso for 13->14 requires the old compression, but a diso for 14->15 will require the new compression. This means that it won't be possible to just use a 14->15 diso, or any of the disos for F15 development, on a standard F14 system. It can be done on a F15 or Rawhide system, of course, but this is a Catch-22 for people who want to install F15 from the DVD. It's possible to temporarily modify a F14 system to use the new compression. First, 1) Run "rpm -q xz xz-devel xz-libs xz-lzma-compat xz-debuginfo" to find which xz binary packages are currently installed. Then go to http://koji.fedoraproject.org/koji/buildinfo?buildID=219464 (xz-5.0.1-2.fc15) and download the corresponding RPMs for the correct arch (either i686 or x86_64). In addition, download the xz-compat-libs RPM for the same arch. 2) Run "rpm -q deltaiso deltarpm drpmsync python-deltarpm python3-deltarpm deltarpm-debuginfo" to find which deltarpm binary packages are currently installed. (If you do not already have the deltaiso package installed, install it from the F14 repo.) Then go to http://koji.fedoraproject.org/koji/buildinfo?buildID=202380 (deltarpm-3.6-0.4.20100708git.fc15) and download the corresponding RPMs for the correct arch. In the following example modification, I'm assuming a x86_64 F14 system with xz, xz-libs, deltaiso, deltarpm, and python-deltarpm installed. --- 1) First use yum shell (man yum-shell) to install/update the xz packages, using the following sequence of commands (adjust the "update" command depending on the currently installed packages): config gpgcheck 0 install xz-compat-libs-5.0.1-2.fc15.x86_64.rpm update xz-5.0.1-2.fc15.x86_64.rpm xz-libs-5.0.1-2.fc15.x86_64.rpm run exit 2) Update the deltarpm packages (again, adjust depending on currently installed packages): yum --nogpgcheck update deltaiso-3.6-0.4.20100708git.fc15.x86_64.rpm deltarpm-3.6-0.4.20100708git.fc15.x86_64.rpm python-deltarpm-3.6-0.4.20100708git.fc15.x86_64.rpm --- At this point, your system will be using the new compression, so applydeltaiso will work on disos for F15 and later. HOWEVER, yum-presto in F14 needs the old compression for deltarpms to rebuild properly (otherwise it falls back to downloading full RPMs), so when done rebuilding the diso, reverse the modification as follows: --- 1) First downgrade the deltarpm packages to the original F14 versions with the following command (adjust depending on currently installed packages): yum downgrade deltaiso deltarpm python-deltarpm 2) Use yum shell to remove/downgrade the xz packages to the original F14 versions, with the following sequence of commands (adjust the "downgrade" command as needed): remove xz-compat-libs downgrade xz xz-libs run exit --- Note that in the special case of DVD->netinst disos, which compression is being used doesn't matter (since these particular disos don't actually contain any deltarpms), so this modification isn't necessary. But for the much larger DVD->DVD disos, it is (when the newer ISO is F15 or later). If this modification is attempted with F13 or below, there may be trouble - I tried it on F13 and would have had to remove python-deltarpm and a few packages depending on it on order to be able to do the deltarpm update (there was a python dependency preventing it from working otherwise). This is not too big a deal, since the packages can be reinstalled afterwards. In any case, most people interested in F15 or above are probably already running at least F14.
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