[PATCH v2 09/44] transport: add a hash algorithm member

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When connecting to a remote system, we need to know what hash algorithm
it will be using to talk to us.  Add a hash_algo member to struct
transport and add a function to read this data from the transport
object.

Signed-off-by: brian m. carlson <sandals@xxxxxxxxxxxxxxxxxxxx>
---
 transport.c | 8 ++++++++
 transport.h | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/transport.c b/transport.c
index 15f5ba4e8f..b43d985f90 100644
--- a/transport.c
+++ b/transport.c
@@ -311,6 +311,7 @@ static struct ref *handshake(struct transport *transport, int for_push,
 		BUG("unknown protocol version");
 	}
 	data->got_remote_heads = 1;
+	transport->hash_algo = reader.hash_algo;
 
 	if (reader.line_peeked)
 		BUG("buffer must be empty at the end of handshake()");
@@ -996,9 +997,16 @@ struct transport *transport_get(struct remote *remote, const char *url)
 			ret->smart_options->receivepack = remote->receivepack;
 	}
 
+	ret->hash_algo = &hash_algos[GIT_HASH_SHA1];
+
 	return ret;
 }
 
+const struct git_hash_algo *transport_get_hash_algo(struct transport *transport)
+{
+	return transport->hash_algo;
+}
+
 int transport_set_option(struct transport *transport,
 			 const char *name, const char *value)
 {
diff --git a/transport.h b/transport.h
index 4298c855be..2a9f96c05a 100644
--- a/transport.h
+++ b/transport.h
@@ -115,6 +115,8 @@ struct transport {
 	struct git_transport_options *smart_options;
 
 	enum transport_family family;
+
+	const struct git_hash_algo *hash_algo;
 };
 
 #define TRANSPORT_PUSH_ALL			(1<<0)
@@ -243,6 +245,12 @@ int transport_push(struct repository *repo,
 const struct ref *transport_get_remote_refs(struct transport *transport,
 					    const struct argv_array *ref_prefixes);
 
+/*
+ * Fetch the hash algorithm used by a remote.
+ *
+ * This can only be called after fetching the remote refs.
+ */
+const struct git_hash_algo *transport_get_hash_algo(struct transport *transport);
 int transport_fetch_refs(struct transport *transport, struct ref *refs);
 void transport_unlock_pack(struct transport *transport);
 int transport_disconnect(struct transport *transport);



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