add update 'none' flag to disable update of submodule by default

diff --git a/setup.c b/setup.c
index ce87900ce3c68ace0f231827bdda0e9a65ef15b3..5ea5502e4881a806ebb3aa9fd38f146cf9f65cf9 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -710,6 +710,11 @@ const char *setup_git_directory_gently(int *nongit_ok)
        const char *prefix;
 
        prefix = setup_git_directory_gently_1(nongit_ok);
+       if (prefix)
+               setenv("GIT_PREFIX", prefix, 1);
+       else
+               setenv("GIT_PREFIX", "", 1);
+
        if (startup_info) {
                startup_info->have_repository = !nongit_ok || !*nongit_ok;
                startup_info->prefix = prefix;