pkg: use absolute filenames for packages

src/package.c

@@ -13,6 +13,7 @@
 #include <fcntl.h>
 #include <ctype.h>
 #include <stdio.h>
+#include <limits.h>
 #include <malloc.h>
 #include <string.h>
 #include <stdlib.h>
@@ -325,12 +326,16 @@ struct apk_package *apk_pkg_read(struct apk_database *db, const char *file)
 {
 	struct read_info_ctx ctx;
 	struct apk_bstream *bs;
+	char realfile[PATH_MAX];
+
+	if (realpath(file, realfile) < 0)
+		return NULL;
 
 	ctx.pkg = apk_pkg_new();
 	if (ctx.pkg == NULL)
 		return NULL;
 
-	bs = apk_bstream_from_file(file);
+	bs = apk_bstream_from_file(realfile);
 	if (bs == NULL)
 		goto err;
 
@@ -355,7 +360,7 @@ struct apk_package *apk_pkg_read(struct apk_database *db, const char *file)
 		};
 		apk_deps_add(&ctx.pkg->depends, &dep);
 	}
-	ctx.pkg->filename = strdup(file);
+	ctx.pkg->filename = strdup(realfile);
 
 	return ctx.pkg;
 err: