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, 3 insertions, 0 deletions

diff --git a/src/pacman/pacman.c b/src/pacman/pacman.c
index 61e0042a..7d584955 100644
--- a/src/pacman/pacman.c
+++ b/src/pacman/pacman.c
@@ -90,6 +90,7 @@ static void usage(int op, const char * const myname)
 			printf(_("  -k, --dbonly         only remove database entry, do not remove files\n"));
 			printf(_("  -n, --nosave         remove configuration files as well\n"));
 			printf(_("  -s, --recursive      remove dependencies also (that won't break packages)\n"));
+			printf(_("  -u, --unneeded       remove unneeded packages (that won't break packages)\n"));
 		} else if(op == PM_OP_UPGRADE) {
 			printf("%s:  %s {-U --upgrade} [%s] <%s>\n", str_usg, myname, str_opt, str_file);
 			printf("%s:\n", str_opt);
@@ -330,6 +331,7 @@ static int parseargs(int argc, char *argv[])
 		{"unrequired", no_argument,       0, 't'},
 		{"upgrades",   no_argument,       0, 'u'},
 		{"sysupgrade", no_argument,       0, 'u'},
+		{"unneeded",   no_argument,       0, 'u'},
 		{"verbose",    no_argument,       0, 'v'},
 		{"downloadonly", no_argument,     0, 'w'},
 		{"refresh",    no_argument,       0, 'y'},
@@ -472,6 +474,7 @@ static int parseargs(int argc, char *argv[])
 			case 'u':
 				config->op_s_upgrade = 1;
 				config->op_q_upgrade = 1;
+				config->flags |= PM_TRANS_FLAG_UNNEEDED;
 				break;
 			case 'v': (config->verbose)++; break;
 			case 'w':