From 6ab4055775b0e560d1f2a1be2e7251d872874655 Mon Sep 17 00:00:00 2001 From: Jonathan Tan Date: Thu, 27 Sep 2018 12:24:06 -0700 Subject: transport: list refs before fetch if necessary The built-in bundle transport and the transport helper interface do not work when transport_fetch_refs() is called immediately after transport creation. This will be needed in a subsequent patch, so fix this. Evidence: fetch_refs_from_bundle() relies on data->header being initialized in get_refs_from_bundle(), and fetch() in transport-helper.c relies on either data->fetch or data->import being set by get_helper(), but neither transport_helper_init() nor fetch() calls get_helper(). Up until the introduction of the partial clone feature, this has not been a problem, because transport_fetch_refs() is always called after transport_get_remote_refs(). With the introduction of the partial clone feature, which involves calling transport_fetch_refs() (to fetch objects by their OIDs) without transport_get_remote_refs(), this is still not a problem, but only coincidentally - we do not support partially cloning a bundle, and as for cloning using a transport-helper-using protocol, it so happens that before transport_fetch_refs() is called, fetch_refs() in fetch-object.c calls transport_set_option(), which means that the aforementioned get_helper() is invoked through set_helper_option() in transport-helper.c. This could be fixed by fixing the transports themselves, but it doesn't seem like a good idea to me to open up previously untested code paths; also, there may be transport helpers in the wild that assume that "list" is always called before "fetch". Instead, fix this by having transport_fetch_refs() call transport_get_remote_refs() to ensure that the latter is always called at least once, unless the transport explicitly states that it supports fetching without listing refs. Signed-off-by: Jonathan Tan Signed-off-by: Junio C Hamano --- transport-internal.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'transport-internal.h') diff --git a/transport-internal.h b/transport-internal.h index 1cde6258a7..004bee5e36 100644 --- a/transport-internal.h +++ b/transport-internal.h @@ -6,6 +6,12 @@ struct transport; struct argv_array; struct transport_vtable { + /** + * This transport supports the fetch() function being called + * without get_refs_list() first being called. + */ + unsigned fetch_without_list : 1; + /** * Returns 0 if successful, positive if the option is not * recognized or is inapplicable, and negative if the option -- cgit v1.2.3