New remove option : -u / --unneeded (FS#6505).

With --unneeded option 'pacman -R' doesn't stop in case of dependency error;
it removes the needed-dependency targets from the target-list instead.  See
also: http://archlinux.org/pipermail/pacman-dev/2007-October/009653.html .

The patch also adds a new causingpkg field to pmdepmissing_t which indicates
the to-be-removed package which would cause a dependency break. This is
needed, because miss->depend.name may be a provision. miss->causingpkg will
be useful in -R dependency error messages too.

[Xavier: renamed inducer to causingpkg, removed the _alpm_pkgname_pkg_cmp
helper function as requested by Aaron. This might be added by a further
commit.  Other small cleanups, updated manpage and bash completion.]

Signed-off-by: Chantry Xavier <shiningxc@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/doc/pacman.8.txt b/doc/pacman.8.txt
index c17700d7..8a3f675d 100644
--- a/doc/pacman.8.txt
+++ b/doc/pacman.8.txt
@@ -233,6 +233,11 @@ Remove Options[[RO]]
 	to a backwards '\--sync' operation, and helps keep a clean system without
 	orphans.
 
+*-u, \--unneeded*::
+	Removes the targets that are not required by any other packages.
+	This is mostly useful when removing a group without using the '-c' option,
+	to avoid breaking any dependencies.
+
 
 Sync Options[[SO]]
 ------------------