From 3390e42adb3b84a9d61b3d46f4105f4cb6ba5edd Mon Sep 17 00:00:00 2001 From: Jonathan Tan Date: Mon, 2 Jul 2018 15:39:44 -0700 Subject: fetch-pack: support negotiation tip whitelist During negotiation, fetch-pack eventually reports as "have" lines all commits reachable from all refs. Allow the user to restrict the commits sent in this way by providing a whitelist of tips; only the tips themselves and their ancestors will be sent. Both globs and single objects are supported. This feature is only supported for protocols that support connect or stateless-connect (such as HTTP with protocol v2). This will speed up negotiation when the repository has multiple relatively independent branches (for example, when a repository interacts with multiple repositories, such as with linux-next [1] and torvalds/linux [2]), and the user knows which local branch is likely to have commits in common with the upstream branch they are fetching. [1] https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next/ [2] https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux/ Signed-off-by: Jonathan Tan Signed-off-by: Junio C Hamano --- builtin/fetch.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) (limited to 'builtin/fetch.c') diff --git a/builtin/fetch.c b/builtin/fetch.c index ea5b9669ad..49ab6ac064 100644 --- a/builtin/fetch.c +++ b/builtin/fetch.c @@ -63,6 +63,7 @@ static int shown_url = 0; static struct refspec refmap = REFSPEC_INIT_FETCH; static struct list_objects_filter_options filter_options; static struct string_list server_options = STRING_LIST_INIT_DUP; +static struct string_list negotiation_tip = STRING_LIST_INIT_NODUP; static int git_fetch_config(const char *k, const char *v, void *cb) { @@ -174,6 +175,8 @@ static struct option builtin_fetch_options[] = { TRANSPORT_FAMILY_IPV4), OPT_SET_INT('6', "ipv6", &family, N_("use IPv6 addresses only"), TRANSPORT_FAMILY_IPV6), + OPT_STRING_LIST(0, "negotiation-tip", &negotiation_tip, N_("revision"), + N_("report that we have only objects reachable from this object")), OPT_PARSE_LIST_OBJECTS_FILTER(&filter_options), OPT_END() }; @@ -1049,6 +1052,40 @@ static void set_option(struct transport *transport, const char *name, const char name, transport->url); } + +static int add_oid(const char *refname, const struct object_id *oid, int flags, + void *cb_data) +{ + struct oid_array *oids = cb_data; + + oid_array_append(oids, oid); + return 0; +} + +static void add_negotiation_tips(struct git_transport_options *smart_options) +{ + struct oid_array *oids = xcalloc(1, sizeof(*oids)); + int i; + + for (i = 0; i < negotiation_tip.nr; i++) { + const char *s = negotiation_tip.items[i].string; + int old_nr; + if (!has_glob_specials(s)) { + struct object_id oid; + if (get_oid(s, &oid)) + die("%s is not a valid object", s); + oid_array_append(oids, &oid); + continue; + } + old_nr = oids->nr; + for_each_glob_ref(add_oid, s, oids); + if (old_nr == oids->nr) + warning("Ignoring --negotiation-tip=%s because it does not match any refs", + s); + } + smart_options->negotiation_tips = oids; +} + static struct transport *prepare_transport(struct remote *remote, int deepen) { struct transport *transport; @@ -1075,6 +1112,12 @@ static struct transport *prepare_transport(struct remote *remote, int deepen) filter_options.filter_spec); set_option(transport, TRANS_OPT_FROM_PROMISOR, "1"); } + if (negotiation_tip.nr) { + if (transport->smart_options) + add_negotiation_tips(transport->smart_options); + else + warning("Ignoring --negotiation-tip because the protocol does not support it."); + } return transport; } -- cgit v1.2.3