Re: Where is the dependency checker ?
[question about adding and deleting packages from lists easily]
Currently the pkg-order package works by reading in a "New" or
"to-be-installed" packages Packages file. One can also supply a
string containing the output of dpkg --info or dpkg -s (the base
method is there in the library, I haven't written anything that
interfaces with dpkg and a file name like that). In fact the test
method supplies a made up package info strng to add a package for a
test. So adding packages is easy.
The package list is a associative array; you don't like a
package, you can delete it, mark it as on hold, mark it as
failed-dependency, mark it as filed-conflict, or just plain delete
Or, if you set an option/variable, the library may dynamically
ignore packages that fail the dependency/conflict check.
I use the packages file as a facilitatot for the top level of
my application, the library adds a package at a time.
The idea is to have a number of lists of packages (I just used
the installed packages from /var/lib/dpkg/status for my application)
in addition to the new packages list, and we test dependency/ordering
graphs aginst each list in turn, (or all of them at once, if you
wish), each pass marking packages n the new list.
Finally, one could just run the ordering pass on the packages
that survive (you could do this in one fell swoop, if you wish, as
well, as the code is written).
I have to formalize the sequence of runs in my application
(which may impact the low level library, but not by much). I may also
push some routines into the base libraries so that others may use
Any comments are welcome.
"The best index to a person's character is a) how he treats people
who can't do him any good and b) how he treats people who can't fight
back." Abigail Van Buren
Manoj Srivastava <url:mailto:email@example.com>
Mobile, Alabama USA <url:http://www.datasync.com/%7Esrivasta/>
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