upgrade: add --available option

That will make the upgrade prefer packages available in repositories.
This is good if one want's to downgrade packages by removing an experimental
repository. Or to force re-install of locally built vs. repository version
when the package version are same, but checksum is different. Fixes #51.

src/apk_defines.h

@@ -59,6 +59,7 @@ extern unsigned int apk_flags;
 #define APK_PROGRESS		0x0008
 #define APK_UPGRADE		0x0010
 #define APK_RECURSIVE		0x0020
+#define APK_PREFER_AVAILABLE	0x0040
 
 #define apk_error(args...)	apk_log("ERROR: ", args);
 #define apk_warning(args...)	if (apk_verbosity > 0) { apk_log("WARNING: ", args); }

src/state.c

@@ -232,8 +232,25 @@ int apk_state_lock_dependency(struct apk_state *state,
 		if (apk_pkg_get_state(c->pkgs[i]) == APK_PKG_INSTALLED)
 			installed = pkg;
 
-		if (latest == NULL ||
-		    apk_pkg_version_compare(pkg, latest) == APK_VERSION_GREATER)
+		if (latest == NULL) {
+			latest = pkg;
+			continue;
+		}
+
+		if (apk_flags & APK_PREFER_AVAILABLE) {
+			if (latest->repos != 0 && pkg->repos == 0)
+				continue;
+
+			if (latest->repos == 0 && pkg->repos != 0) {
+				latest = pkg;
+				continue;
+			}
+
+			/* Otherwise both are not available, or both are
+			 * available and we just compare the versions then */
+		}
+
+		if (apk_pkg_version_compare(pkg, latest) == APK_VERSION_GREATER)
 			latest = pkg;
 	}
 

src/upgrade.c

@@ -16,6 +16,18 @@
 #include "apk_database.h"
 #include "apk_state.h"
 
+static int upgrade_parse(void *ctx, int optch, int optindex, const char *optarg)
+{
+	switch (optch) {
+	case 'a':
+		apk_flags |= APK_PREFER_AVAILABLE;
+		break;
+	default:
+		return -1;
+	}
+	return 0;
+}
+
 static int upgrade_main(void *ctx, int argc, char **argv)
 {
 	struct apk_database db;
@@ -45,9 +57,16 @@ err:
 	return r;
 }
 
+static struct option upgrade_options[] = {
+	{ "available",	no_argument,		NULL, 'a' },
+};
+
 static struct apk_applet apk_upgrade = {
 	.name = "upgrade",
-	.usage = "",
+	.usage = "[-a|--available]",
+	.num_options = ARRAY_SIZE(upgrade_options),
+	.options = upgrade_options,
+	.parse = upgrade_parse,
 	.main = upgrade_main,
 };