policy: new applet

to show different versions of package and the repositories from
which it is available from.

src/Makefile

@@ -21,7 +21,7 @@ endif
 progs-y			+= apk
 apk-objs		:= apk.o add.o del.o fix.o update.o info.o \
 			   search.o upgrade.o cache.o ver.o index.o fetch.o \
-			   audit.o verify.o dot.o
+			   audit.o verify.o dot.o policy.o
 
 libapk.so-objs		:= common.o database.o package.o archive.o \
 			   version.o io.o url.o gunzip.o blob.o hash.o print.o \

src/apk_database.h

@@ -97,7 +97,7 @@ struct apk_name {
 };
 
 struct apk_repository {
-	char *url;
+	const char *url;
 	struct apk_checksum csum;
 	apk_blob_t description;
 };

src/database.c

@@ -68,7 +68,7 @@ static const char * const apk_triggers_file = "lib/apk/db/triggers";
 static const char * const apk_triggers_file_tmp = "lib/apk/db/triggers.new";
 static const char * const apk_triggers_file_old = "var/lib/apk/triggers";
 
-static const char * const apk_installed_file = "lib/apk/db/installed";
+const char * const apk_installed_file = "lib/apk/db/installed";
 static const char * const apk_installed_file_tmp = "lib/apk/db/installed.new";
 static const char * const apk_installed_file_old = "var/lib/apk/installed";
 
@@ -609,7 +609,7 @@ int apk_repo_format_real_url(struct apk_database *db, struct apk_repository *rep
 int apk_repo_format_item(struct apk_database *db, struct apk_repository *repo, struct apk_package *pkg,
 			 int *fd, char *buf, size_t len)
 {
-	if (strcmp(repo->url, "cache") == 0) {
+	if (repo->url == apk_linked_cache_dir) {
 		*fd = db->cache_fd;
 		return apk_pkg_format_cache_pkg(APK_BLOB_PTR_LEN(buf, len), pkg);
 	} else {
@@ -1423,7 +1423,7 @@ static int add_repos_from_file(void *ctx, int dirfd, const char *file)
 static void apk_db_setup_repositories(struct apk_database *db)
 {
 	db->repos[APK_REPOSITORY_CACHED] = (struct apk_repository) {
-		.url = "cache",
+		.url = apk_linked_cache_dir,
 		.csum.data = {
 			0xb0,0x35,0x92,0x80,0x6e,0xfa,0xbf,0xee,0xb7,0x09,
 			0xf5,0xa7,0x0a,0x7c,0x17,0x26,0x69,0xb0,0x05,0x38 },
@@ -1737,7 +1737,7 @@ void apk_db_close(struct apk_database *db)
 	}
 
 	for (i = APK_REPOSITORY_FIRST_CONFIGURED; i < db->num_repos; i++) {
-		free(db->repos[i].url);
+		free((void*) db->repos[i].url);
 		free(db->repos[i].description.ptr);
 	}
 	foreach_array_item(ppath, db->protected_paths)

src/policy.c

+/* policy.c - Alpine Package Keeper (APK)
+ *
+ * Copyright (C) 2013 Timo Teräs <timo.teras@iki.fi>
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation. See http://www.gnu.org/ for details.
+ */
+
+#include <stdio.h>
+#include "apk_defines.h"
+#include "apk_applet.h"
+#include "apk_database.h"
+#include "apk_version.h"
+#include "apk_print.h"
+
+extern const char * const apk_installed_file;
+
+static void print_policy(struct apk_database *db, const char *match, struct apk_name *name, void *ctx)
+{
+	struct apk_provider *p;
+	struct apk_repository *repo;
+	int i, j, num = 0;
+/*
+zlib1g policy:
+  2.0:
+    @testing http://nl.alpinelinux.org/alpine/edge/testing
+  1.7:
+    @edge http://nl.alpinelinux.org/alpine/edge/main
+  1.2.3.5 (upgradeable):
+    http://nl.alpinelinux.org/alpine/v2.6/main
+  1.2.3.4 (installed):
+    /media/cdrom/...
+    http://nl.alpinelinux.org/alpine/v2.5/main
+  1.1:
+    http://nl.alpinelinux.org/alpine/v2.4/main
+*/
+	foreach_array_item(p, name->providers) {
+		if (p->pkg->name != name)
+			continue;
+		if (num++ == 0)
+			printf("%s policy:\n", name->name);
+		printf("  " BLOB_FMT ":\n", BLOB_PRINTF(*p->version));
+		if (p->pkg->ipkg != NULL)
+			printf("    %s\n", apk_installed_file);
+		for (i = 0; i < db->num_repos; i++) {
+			repo = &db->repos[i];
+			if (!(BIT(i) & p->pkg->repos))
+				continue;
+			for (j = 0; j < db->num_repo_tags; j++) {
+				if (db->repo_tags[j].allowed_repos & p->pkg->repos)
+					printf("    "BLOB_FMT"%s%s\n",
+						BLOB_PRINTF(db->repo_tags[j].tag),
+						j == 0 ? "" : " ",
+						repo->url);
+			}
+		}
+	}
+}
+
+static int policy_main(void *ctx, struct apk_database *db, struct apk_string_array *args)
+{
+	apk_name_foreach_matching(db, args, apk_foreach_genid(), print_policy, NULL);
+	return 0;
+}
+
+static struct apk_applet apk_policy = {
+	.name = "policy",
+	.help = "Show repository policy for packages.",
+	.open_flags = APK_OPENF_READ,
+	.main = policy_main,
+};
+
+APK_DEFINE_APPLET(apk_policy);
+
+