On 06/04/2014 03:21 PM, Tomas Mlcoch wrote:
Hi,
as you may know, the primary repodata contains information about header
byte range, e.g.:
<rpm:header-range start="1384" end="1050136"/>
AFAIK, the rpm library doesn't provide any way how to get this information
and tools like createrepo[1] or createrepo_c[2] have to do it by itself.
It would be nice if the rpm library had such functionality included, so all
tools, which need this information, could use a standard way how to get it
and also it would be handy for case that the header format will change in
future.
Is there any plan to add such function into the rpm or it is already there
and I've missed something?
Does something still use that data? AFAIK the header byte range in
repodata is nothing but a hack which yum needed at dawn of times, but
long since unneeded.
Anyway, you can get it indirectly: after rpmReadPackageFile(), Ftell()
on the file descriptor will give you the header end. Substract the size
of RPMTAG_HEADERIMMUTABLE data from the header from the end offset to
get the start offset.
- Panu -
Thanks!
I have no idea if someone uses this.
Personally, I think it could be useful for these who only want to download
headers and operate on them (e.g. extract some additional data that are not
part of repodata but doesn't need the payload). But have no idea if it's a
valid use-case..
BTW, I had a fairly strong sense of deja vu when writing the above...
and now I remembered why: http://rpm.org/ticket/850 :)
- Panu -
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