link_alt_odb_entries: make empty input a noop

diff --git a/sha1_file.c b/sha1_file.c
index d65ca432459e7be287ec6ed85125a9afa6b74de1..b8b897a30773a4c7312e23a616353989c93f366f 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -428,6 +428,9 @@ static void link_alt_odb_entries(const char *alt, int sep,
        struct strbuf objdirbuf = STRBUF_INIT;
        struct strbuf entry = STRBUF_INIT;
 
+       if (!alt || !*alt)
+               return;
+
        if (depth > 5) {
                error("%s: ignoring alternate object stores, nesting too deep.",
                                relative_base);
@@ -631,7 +634,6 @@ void prepare_alt_odb(void)
                return;
 
        alt = getenv(ALTERNATE_DB_ENVIRONMENT);
-       if (!alt) alt = "";
 
        alt_odb_tail = &alt_odb_list;
        link_alt_odb_entries(alt, PATH_SEP, NULL, 0);