Dear Folks, seth vidal wrote: > > First post and I'm completely new to YUM, but as I'm learning I'm also > > documenting my every step as I migrate from RHN to YUM. > > > > Anyhow.. for the sake of documentation I am trying to 'illustrate' how YUM > > 'works.. > > > > And, as I'm reading the 'How it Works' info on the website I'm curious > > about the following line > > > > <snip> > > Every rpm has a header. That header contains a complete file list, > > package descriptions, lists of what features/libs it provides, lists of > > what it requires, what it conflicts with etc. In order for rpm to make a > > decision about what an rpm will need to be installed it needs the > > information in the header. > > </snip> > > > > My question is.. how can I view this 'header'? How can I see exactly what > > YUM see's when it determines what dependencies and such? I imagine this > > is a simple RPM command? > > > > You know all the stuff you see when you do an rpm -qi [somepackage] or > rpm -ql [somepackage] that comes from the header. there is lots of > information in there. > > If you want to read the header yourself you can import it in python and > run something like: > > for key in hdr.keys(): > print hdr[key] After trying to import mach-0-0.4.3-1.fr.i386.hdr, then doing zcat mach-0-0.4.3-1.fr.i386.hdr > mach.py, and also mach.pyc, I failed to import the header: $ python Python 2.2.3 (#1, Oct 15 2003, 23:33:35) [GCC 3.3.1 20030930 (Red Hat Linux 3.3.1-6)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import mach Traceback (most recent call last): File "<stdin>", line 1, in ? ImportError: Bad magic number in mach.pyc Now I tried to learn enough python by reading the source, but still haven't figured out how. Sorry to be so slow. Please give me a clue as to how to do this. I just want to write a very simple utility to show the contents of headers, so I can do showheader mach-0-0.4.3-1.fr.i386.hdr instead of sudo yum install mach .. rpm -qi mach sudo yum remove mach -- Nick Urbanik RHCE nicku(at)vtc.edu.hk Dept. of Information & Communications Technology Hong Kong Institute of Vocational Education (Tsing Yi) Tel: (852) 2436 8576, (852) 2436 8713 Fax: (852) 2436 8526 PGP: 53 B6 6D 73 52 EE 1F EE EC F8 21 98 45 1C 23 7B ID: 7529555D GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24 ID: BB9D2C24
