[arch-general] Advanced pacman dependency functions

[Alessio 'mOLOk' Bolognino]

On Sat 2007-12-22 12:52 , bardo wrote:
> Hi all.
> 
> I was looking for a way to do a couple of things with pacman that may
> be useful, mainly for package maintainers. Maybe they can already be
> done and I just didn't find out how. I used to use pt-deptree, but it
> hasn't been working for quite some time now.
> 
> The first one is finding all the packages that directly depend on a
> specific package, even if they're not installed. This came to my mind
> considering those upgrades which break other software, like x264 and
> tcl/tk (8.5 has just been released): it could be a lot easier to test
> if all packages work properly with the new version or if it is
> necessary to rebuild them.

Something like this? (proof of concept)

---------------------------------8<------------------------------------
foo() { 
    checkdep=$1
    pkgbuild=$2
    unset depends makedepends
    source $pkgbuild
    for dep in ${depends[@]} ${makedepends[@]}; do
		dep_s=$(echo $dep | sed 's|=.*$||' | sed 's|>.*$||' \
               | sed 's|<.*$||')
        if [[ "$dep_s" == "$checkdep" ]]; then
            echo $pkgbuild
        fi
    done
}

find_dep=$1
for pkg in `find /var/abs -name PKGBUILD`; do
    foo $find_dep $pkg
done
---------------------------------8<------------------------------------

> Second, I often find myself looking for package dependencies along the
> tree, because I need to know, given two packages, if one of the two
> depends on the other or not. This is good when I'm deciding which
> dependencies should be put in a package, becuase the cycle
> edit-makepkg-namcap is sometimes impractical when the package has a
> lot of dependencies.

I think I didn't understand what you need here.
Can you provide a real example where this is useful?

-- 
Alessio 'mOLOk' Bolognino
Arch Linux Trusted User

Please send personal email to themolok at gmail.com

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