fetch-pack: check for shallow if depth given

When a repository is first fetched as a shallow clone, either by
git-clone or by fetching into an empty repo, the server's capabilities
are not currently consulted. The client will send shallow requests even
if the server does not understand them, and the resulting error may be
unhelpful to the user. This change pre-emptively checks so we can exit
with a helpful error if necessary.

Signed-off-by: Mike Edgar <adgar@google.com>
Reviewed-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/fetch-pack.c b/fetch-pack.c
index eeee2bb7e08a21dfe091a30c8378da6d488228f5..e3f4ef2c7a5320e959079de12023b0d343e93592 100644 (file)
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -786,7 +786,7 @@ static struct ref *do_fetch_pack(struct fetch_pack_args *args,
        sort_ref_list(&ref, ref_compare_name);
        qsort(sought, nr_sought, sizeof(*sought), cmp_ref_by_name);
 
-       if (is_repository_shallow() && !server_supports("shallow"))
+       if ((args->depth > 0 || is_repository_shallow()) && !server_supports("shallow"))
                die("Server does not support shallow clients");
        if (server_supports("multi_ack_detailed")) {
                if (args->verbose)