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Alan McKinnon schrieb am 09.11.2008 07:13: |
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> On Sunday 09 November 2008 06:04:02 Dale wrote: |
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>> meino.cramer@×××.de wrote: |
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>>> Hi, |
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>>> |
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>>> is there a way to list the package, which depend on |
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>>> a given (known) package (in my case a library)? |
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>>> |
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>>> Kind regards, |
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>>> Meino Cramer |
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>> If I understand correctly, equery depends <package name> . That's if I |
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>> understand correctly. If you don't have it, emerge gentoolkit. |
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> |
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> Just be aware that equery depends is somewhat broken |
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> |
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> It lists dependencies in the tree, not dependencies a specific machine is |
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> using. Plus it doesn't find some valid deps either. |
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> |
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> It's still useful, but the user also has to use eix to determine which deps |
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> are valid for them and which are not. |
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> |
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There is a possibility to get the reverse dependencies, but it seems |
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almost nobody is aware of this because this function of portage is |
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mostly used for cleaning up unneeded packages. But in order to remove |
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unneeded packages portage has to know the reverse dependencies of each |
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package to determine if it is unneeded. |
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emerge -pv --depclean atom |
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Always consider that equery and depclean only work on packages that are |
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installed on the system and not for packages that are not. |
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Gentoo-Portage [1] can list the reverse dependencies for packages that |
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are not installed. |
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Note the output of equery is sometimes wrong. To test this let us |
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compare the output of the "emerge -pv depclean atom" with "equery |
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depends atom". For example we want to check the reverse dependencies of |
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x11-libs/gtk+ on my system. |
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It is almost identical besides 1) media-video/mplayer and 2) |
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sys-devel/gcc are listed only in equery and 3) net-www/gnash is only |
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listed in depclean output. |
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1) So why is mplayer listed in equery. The gtk use flag is globally on |
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on my system but I have disabled gtk in package.use so equery is wrong here. |
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2) Now for gcc I have no entry in package.use that disables it so it |
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seems at the first glance equery is right. Lets take a look at the |
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ebuild itself. The following is from the RDEPEND section. |
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|
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!build? ( |
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gcj? ( |
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gtk? ( |
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x11-libs/libXt |
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x11-libs/libX11 |
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x11-libs/libXtst |
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x11-proto/xproto |
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x11-proto/xextproto |
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>=x11-libs/gtk+-2.2 |
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x11-libs/pango |
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) |
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To explain this, it says if the build flag is disabled and gcj and gtk |
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are enabled it will depend on the the packages listed below gtk. I have |
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build and gcj disabled but gtk enabled, so it does not fulfill the |
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conditions needed for a gtk dependency and equery is wrong again. |
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3) Now finally why does depclean list gnash and equery not. The gtk flag |
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is enabled for the ebuild and the dependency list in the ebuild clearly |
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shows: |
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gtk? ( |
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>x11-libs/gtk+-2 |
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x11-libs/pango |
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dev-libs/glib |
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dev-libs/atk |
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) |
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I guess equery gets confused by the following construct in the ebuild |
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which looks similar to the gcc case: |
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!gtk? ( !kde? ( !qt3? ( !sdl? ( ( !fbcon? ( |
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>x11-libs/gtk+-2 |
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x11-libs/pango |
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dev-libs/glib |
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dev-libs/atk |
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=kde-base/kdelibs-3.5* |
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) ) ) ) ) ) |
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This conditions doesn't match on my system so equery does not list |
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gnash. In addition I think such conditions may cause some |
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misunderstanding as they mean if gtk kde qt3 sdl and fbcon are all unset |
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it should depend on gtk and kde which would be rather confusing for the |
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user if he has this flags unset. |
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[1] http://www.gentoo-portage.com/x11-libs/gtk+/RDep#ptabs |
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Regards, |
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Daniel |
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