Add a way to exclude specific packages from the install

When an excluded package is required by another package an error
will be generated.  If the excluded package is only recommended,
no error will be generated.

The lifespan of the exclude_list covers the execution of the process,
so there is no need to free the data.

Upstream-Status: Pending

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Jonathan Liu <net147@gmail.com>

Index: trunk/libopkg/opkg_conf.c
===================================================================
--- trunk.orig/libopkg/opkg_conf.c
+++ trunk/libopkg/opkg_conf.c
@@ -442,6 +442,7 @@ opkg_conf_init(void)
 	pkg_dest_list_init(&conf->pkg_dest_list);
 	pkg_dest_list_init(&conf->tmp_dest_list);
 	nv_pair_list_init(&conf->arch_list);
+	conf->exclude_list = NULL;
 
 	return 0;
 }
Index: trunk/libopkg/opkg_conf.h
===================================================================
--- trunk.orig/libopkg/opkg_conf.h
+++ trunk/libopkg/opkg_conf.h
@@ -49,6 +49,8 @@ struct opkg_conf
      pkg_dest_list_t pkg_dest_list;
      pkg_dest_list_t tmp_dest_list;
      nv_pair_list_t arch_list;
+     size_t exclude_count;
+     char ** exclude_list;
 
      int restrict_to_default_dest;
      pkg_dest_t *default_dest;
Index: trunk/libopkg/pkg_depends.c
===================================================================
--- trunk.orig/libopkg/pkg_depends.c
+++ trunk/libopkg/pkg_depends.c
@@ -212,6 +212,22 @@ pkg_hash_fetch_unsatisfied_dependencies(
 			 continue;
 		    }
 
+		    /* Check for excluded packages */
+		    if (satisfying_pkg != NULL && conf->exclude_list) {
+			int i, exclude = 0;
+			for (i = 0; i < conf->exclude_count; i++) {
+			    if (!strcmp(satisfying_pkg->name, conf->exclude_list[i])) {
+				opkg_msg(NOTICE, "%s: exclude required package %s"
+					"at users request\n",
+					pkg->name, satisfying_pkg->name);
+				exclude = 1;
+				break;
+			    }
+			}
+			if (exclude)
+			    continue;
+		    }
+
 		    opkg_msg(DEBUG, "satisfying_pkg=%p\n", satisfying_pkg);
 		    if (satisfying_pkg != NULL) {
 			 satisfier_entry_pkg = satisfying_pkg;
Index: trunk/src/opkg-cl.c
===================================================================
--- trunk.orig/src/opkg-cl.c
+++ trunk/src/opkg-cl.c
@@ -45,6 +45,7 @@ enum {
 	ARGS_OPT_PREFER_ARCH_TO_VERSION,
 	ARGS_OPT_ADD_ARCH,
 	ARGS_OPT_ADD_DEST,
+	ARGS_OPT_ADD_EXCLUDE,
 	ARGS_OPT_NOACTION,
 	ARGS_OPT_DOWNLOAD_ONLY,
 	ARGS_OPT_NODEPS,
@@ -95,6 +96,7 @@ static struct option long_options[] = {
 	{"offline-root", 1, 0, 'o'},
 	{"add-arch", 1, 0, ARGS_OPT_ADD_ARCH},
 	{"add-dest", 1, 0, ARGS_OPT_ADD_DEST},
+	{"add-exclude", 1, 0, ARGS_OPT_ADD_EXCLUDE},
 	{"test", 0, 0, ARGS_OPT_NOACTION},
 	{"tmp-dir", 1, 0, 't'},
 	{"tmp_dir", 1, 0, 't'},
@@ -198,6 +200,18 @@ args_parse(int argc, char *argv[])
 			}
 			free(tuple);
 			break;
+		case ARGS_OPT_ADD_EXCLUDE:
+			tuple = xstrdup(optarg);
+			if (!conf->exclude_list) {
+				conf->exclude_count = 1;
+				conf->exclude_list = malloc(sizeof(char *) * conf->exclude_count);
+				conf->exclude_list[conf->exclude_count - 1] = tuple;
+			} else {
+				conf->exclude_count++;
+				conf->exclude_list = realloc(conf->exclude_list, sizeof(char *) * conf->exclude_count);
+				conf->exclude_list[conf->exclude_count - 1] = tuple;
+			}
+			break;
 		case ARGS_OPT_NOACTION:
 			conf->noaction = 1;
 			break;
@@ -282,6 +296,7 @@ usage()
 	printf("\t--offline-root <dir>	offline installation of packages.\n");
 	printf("\t--add-arch <arch>:<prio>	Register architecture with given priority\n");
 	printf("\t--add-dest <name>:<path>	Register destination with given path\n");
+	printf("\t--add-exclude <name>		Register package to be excluded from install\n");
 	printf("\t--prefer-arch-to-version\t 	Use the architecture priority package rather\n");
 	printf("\t				than the higher version one if more\n");
 	printf("\t				than one candidate is found.\n");