Currently when attempting to sync a group where all packages are
ignored (either by ignorepkg, ignoregroup or --needed) pacman
will error with "target not found".

Instead, if a group has no packages, check if the group exists
and only throw an error if it does not.

Signed-off-by: morganamilo <morganam...@gmail.com>

diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
index 2d3d198a..316853bb 100644
--- a/lib/libalpm/alpm.h
+++ b/lib/libalpm/alpm.h
@@ -1446,6 +1446,8 @@ int alpm_extract_keyid(alpm_handle_t *handle, const char 
*identifier,
 
 alpm_list_t *alpm_find_group_pkgs(alpm_list_t *dbs, const char *name);
 
+int alpm_group_exists(alpm_list_t *dbs, const char *name);
+
 /*
  * Sync
  */
diff --git a/lib/libalpm/sync.c b/lib/libalpm/sync.c
index 05f58fad..57058782 100644
--- a/lib/libalpm/sync.c
+++ b/lib/libalpm/sync.c
@@ -313,6 +313,26 @@ alpm_list_t SYMEXPORT *alpm_find_group_pkgs(alpm_list_t 
*dbs,
        return pkgs;
 }
 
+/** Check if a group exists across a list of databases.
+ * @param dbs the list of alpm_db_t *
+ * @param name the name of the group
+ * @return 1 if the group exists, 0 if it does not
+ */
+int SYMEXPORT alpm_group_exists(alpm_list_t *dbs,
+               const char *name)
+{
+       alpm_list_t *i;
+       for(i = dbs; i; i = i->next) {
+               alpm_db_t *db = i->data;
+
+               if (alpm_db_get_group(db, name)) {
+                       return 1;
+               }
+       }
+
+       return 0;
+}
+
 /** Compute the size of the files that will be downloaded to install a
  * package.
  * @param newpkg the new package to upgrade to
diff --git a/src/pacman/sync.c b/src/pacman/sync.c
index ef8faedf..32df6e04 100644
--- a/src/pacman/sync.c
+++ b/src/pacman/sync.c
@@ -543,6 +543,10 @@ static int process_group(alpm_list_t *dbs, const char 
*group, int error)
        int count = alpm_list_count(pkgs);
 
        if(!count) {
+               if(alpm_group_exists(dbs, group)) {
+                       return 0;
+               }
+
                pm_printf(ALPM_LOG_ERROR, _("target not found: %s\n"), group);
                return 1;
        }
-- 
2.19.1

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