Signed-off-by: Stefan Beller <sbel...@google.com>
---
 fetch-pack.h       |  1 +
 remote.c           |  2 ++
 remote.h           |  2 ++
 transport-helper.c |  1 +
 transport.c        | 20 ++++++++++++++++++--
 transport.h        |  8 ++++++++
 6 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/fetch-pack.h b/fetch-pack.h
index bb7fd76..3314362 100644
--- a/fetch-pack.h
+++ b/fetch-pack.h
@@ -8,6 +8,7 @@ struct sha1_array;
 
 struct fetch_pack_args {
        const char *uploadpack;
+       int transport_version;
        int unpacklimit;
        int depth;
        unsigned quiet:1;
diff --git a/remote.c b/remote.c
index 28fd676..760611d 100644
--- a/remote.c
+++ b/remote.c
@@ -9,6 +9,7 @@
 #include "string-list.h"
 #include "mergesort.h"
 #include "argv-array.h"
+#include "transport.h"
 
 enum map_direction { FROM_SRC, FROM_DST };
 
@@ -164,6 +165,7 @@ static struct remote *make_remote(const char *name, int len)
                return ret;
 
        ret = xcalloc(1, sizeof(struct remote));
+       ret->transport_version = DEFAULT_TRANSPORT_VERSION;
        ret->prune = -1;  /* unspecified */
        ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
        remotes[remotes_nr++] = ret;
diff --git a/remote.h b/remote.h
index c21fd37..cdb25d0 100644
--- a/remote.h
+++ b/remote.h
@@ -51,6 +51,8 @@ struct remote {
        const char *receivepack;
        const char *uploadpack;
 
+       int transport_version;
+
        /*
         * for curl remotes only
         */
diff --git a/transport-helper.c b/transport-helper.c
index b934183..3cb386f 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -248,6 +248,7 @@ static int disconnect_helper(struct transport *transport)
 }
 
 static const char *unsupported_options[] = {
+       TRANS_OPT_TRANSPORTVERSION,
        TRANS_OPT_UPLOADPACK,
        TRANS_OPT_RECEIVEPACK,
        TRANS_OPT_THIN,
diff --git a/transport.c b/transport.c
index 095e61f..608b92c 100644
--- a/transport.c
+++ b/transport.c
@@ -151,6 +151,16 @@ static int set_git_option(struct git_transport_options 
*opts,
                                die("transport: invalid depth option '%s'", 
value);
                }
                return 0;
+       } else if (!strcmp(name, TRANS_OPT_TRANSPORTVERSION)) {
+               if (!value)
+                       opts->transport_version = DEFAULT_TRANSPORT_VERSION;
+               else {
+                       char *end;
+                       opts->transport_version = strtol(value, &end, 0);
+                       if (*end)
+                               die("transport: invalid transport version 
option '%s'", value);
+               }
+               return 0;
        }
        return 1;
 }
@@ -203,6 +213,7 @@ static int fetch_refs_via_pack(struct transport *transport,
 
        memset(&args, 0, sizeof(args));
        args.uploadpack = data->options.uploadpack;
+       args.transport_version = data->options.transport_version;
        args.keep_pack = data->options.keep;
        args.lock_pack = 1;
        args.use_thin_pack = data->options.thin;
@@ -694,6 +705,8 @@ struct transport *transport_get(struct remote *remote, 
const char *url)
                ret->connect = connect_git;
                ret->disconnect = disconnect_git;
                ret->smart_options = &(data->options);
+               ret->smart_options->transport_version =
+                       DEFAULT_TRANSPORT_VERSION;
 
                data->conn = NULL;
                data->got_remote_heads = 0;
@@ -706,12 +719,15 @@ struct transport *transport_get(struct remote *remote, 
const char *url)
 
        if (ret->smart_options) {
                ret->smart_options->thin = 1;
-               ret->smart_options->uploadpack = "git-upload-pack";
+               ret->smart_options->uploadpack = DEFAULT_TRANSPORT_UPLOAD_PACK;
                if (remote->uploadpack)
                        ret->smart_options->uploadpack = remote->uploadpack;
-               ret->smart_options->receivepack = "git-receive-pack";
+               ret->smart_options->receivepack = 
DEFAULT_TRANSPORT_RECEIVE_PACK;
                if (remote->receivepack)
                        ret->smart_options->receivepack = remote->receivepack;
+               if (remote->transport_version)
+                       ret->smart_options->transport_version =
+                               remote->transport_version;
        }
 
        return ret;
diff --git a/transport.h b/transport.h
index c681408..af90529 100644
--- a/transport.h
+++ b/transport.h
@@ -13,6 +13,7 @@ struct git_transport_options {
        unsigned self_contained_and_connected : 1;
        unsigned update_shallow : 1;
        int depth;
+       int transport_version;
        const char *uploadpack;
        const char *receivepack;
        struct push_cas_option *cas;
@@ -188,6 +189,13 @@ int transport_restrict_protocols(void);
 /* Send push certificates */
 #define TRANS_OPT_PUSH_CERT "pushcert"
 
+/* Use a new version of the git protocol */
+#define TRANS_OPT_TRANSPORTVERSION "transportversion"
+
+#define DEFAULT_TRANSPORT_VERSION 1
+#define DEFAULT_TRANSPORT_UPLOAD_PACK "git-upload-pack"
+#define DEFAULT_TRANSPORT_RECEIVE_PACK "git-receive-pack"
+
 /**
  * Returns 0 if the option was used, non-zero otherwise. Prints a
  * message to stderr if the option is not used.
-- 
2.8.0.32.g71f8beb.dirty

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