Hi folks,
I've just finished rsyncing/downloading/jigdoizing the entire i386/x86_64 CentOS 4.2 distribution.
If anyone is interested go to
http://mirror.tcs.ii.uj.edu.pl/jigdo/
You'll need to edit the .jigdo file by hand to change the server section
[Servers] CentOS42=file:/opt/mirrors/centos/4.2/
to point to a local mirror (file, http or ftp), ie. to use kernel.org:
[Servers] CentOS42=http://mirrors.kernel.org/centos/4.2/
While doing this I have come upon a few questions:
a) it seems the server cd's have a lot of stuff not present in the normal directory mirror, I guess this is an artifact of the build process? [the template files for the servercd's are ~120MB]
b) what are the .newheaders and .repodata directories on i386 CD1?
c) why do the mirror repodata/*.xml.gz files not match neither the CD nor DVD versions for i386?
d) why does the i386 DVD not match ideally, but the x86_64 DVD matches for _all_ files. The x86_64 CD1 also matches _much_ better than the i386 CD1...
e) why aren't identical files between the two trees hardlinked?
$ ls -ali os/*/CentOS/RPMS/yum*noarch* 278532 -rw-rw-r-- 1 maze maze 395922 Sep 4 19:48 i386/CentOS/RPMS/yum-2.4.0-1.centos4.noarch.rpm 1165388 -rw-rw-r-- 1 maze maze 395922 Oct 10 22:20 x86_64/CentOS/RPMS/yum-2.4.0-1.centos4.noarch.rpm
$ md5sum os/*/CentOS/RPMS/yum*noarch* 371d55a19f8e4ca13d22974128ab4671 i386/CentOS/RPMS/yum-2.4.0-1.centos4.noarch.rpm 371d55a19f8e4ca13d22974128ab4671 x86_64/CentOS/RPMS/yum-2.4.0-1.centos4.noarch.rpm
Just an example of two identical files from my mirror, one of which is wasting space even though contents are identical. I expect we have this situation for almost _all_ i386 packages from the x86_64 distribution...
$ pwd /opt/mirrors/centos/4.2/os/x86_64 $ find|grep "i386.rpm"|while read i;do diff -qr "$i" "../i386/$i";done $ find|grep "i386.rpm"|while read i;do cat "$i";done|wc -c 440745010 $ find|grep "noarch.rpm"|while read i;do diff -qr "$i" "../i386/$i";done $ find|grep "noarch.rpm"|while read i;do cat "$i";done|wc -c 426816227
$ pwd /opt/mirrors/centos/4.2/updates/x86_64 $ find|grep "i386.rpm"|while read i;do diff -qr "$i" "../i386/$i";done $ find|grep "i386.rpm"|while read i;do cat "$i";done|wc -c 12819616 $ find|grep "noarch.rpm"|while read i;do diff -qr "$i" "../i386/$i";done diff: ../i386/./RPMS/createrepo-0.4.3-1.noarch.rpm: No such file or directory $ find|grep "noarch.rpm"|while read i;do cat "$i";done|wc -c 2164495
$ ls RPMS/createrepo-0.4.3-1.noarch.rpm -al -rw-rw-r-- 2 maze maze 18284 Sep 5 13:59 RPMS/createrepo-0.4.3-1.noarch.rpm
That seems to me to be a 880 MB mirror space savings to be made there... Considering the i386/x86_64 mirror takes up 7.7GB (without iso's) that's quite a bit...
I also imagine the noarch files are shared with most of the other architectures... so I'd assume another 400MB per every next arch can be saved...
f) Why aren't jigdo files available on the site? They'd really come in useful, especially in the situation I had where I already had a complete mirror of all the files, but I still had to bittorrent the CD/DVD's even though I had 99% of the required data on disk!
Cheers, MaZe.