Xml in packaging system
leimy2k at mac.com
Fri Oct 31 12:42:37 PST 2003
This is very cool... At first glance it looks like
build the package.
Now you have a set of port rules?
Am I way off?
If not I really like it :). How would this differ from expect?
I think I missed something.
On Oct 31, 2003, at 12:25 PM, Matthew Dillon wrote:
What I envision in a packaging system is something that makes the
port maintainer's life as easy as possible.
Lets say you are developing a new port, libabcd, which depends on a
number of other libraries which are also ports in the system.
As a developer I want to be able to do something like this:
% vfsenvironment empty 'csh'
(Now you would be in a vfs-sandboxed shell. You can map-in other
which you have already installed on the system):
% vfsrecord "build_depend"
ok, recording mappings as 'build_depend'
% vfsmap libgettextsrc:0.12.11
% vfsmap libexpat (map in the highest installed version)
% vfsmap libc
% vfsmap gmake
% vfsrename /usr/local/bin/gmake /usr/local/bin/make
Once you have built an environment you could then attempt to build
your new port natively simply by running the port's native build
(at least initially). If things are missing you can vfsunmap and
additional required elements.
Modifications to the port distribution itself could also be done
the VFS. In this case the VFS would be acting like a unionfs in
would record whiteouts (deletions) and copy files that are
a higher layer which would be stored in the VFS environment
memory (sufficient as long as no more then 2G worth of changes are
% vfsunion ~dillon/original_distribution work
(make your modifications to the work. edit files, rm files,
When you are satisfied that the build is working you can save the
state, which will also 'diff' any modifications you have made and
file/directory deletions. The output file would be human readable
human editable (though it's easier for the developer to just enter
vfs environment and make modifications within the environment)
% vfsrecord -w
all changes recorded in 'build_depend.vfs'
Ok. So there you have it, you now have the VFS environment and the
patches required to build your new port!
Similar action would be taken for install and run-time
Run-time dependancies would be more restrictive since under normal
conditions you might not want to have to run every port wrapped in
VFS. e.g. simple ports like when you run 'less'. But more
ports, like OpenOffice, might always run in some sort of VFS
Note that the VFS environment I am contemplating does not take over
the entire filesystem space. That is, in the above example, the
directories /usr/local/lib and /usr/local/bin would be selectively
and/or modified within the VFS but other directories, like your
directory for example (really all other directories not involved
mapping operations) would simply be passed through. You would
explicitly tell the VFS to map something as a union in order for
to record your modifications within that target.
In anycase, that is my idea... to approach it from the port
point of view rather then from a technical standpoint.
<dillon at xxxxxxxxxxxxx>
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