remote-curl: send the refs to fetch-pack on stdin

Now that we can throw an arbitrary number of refs at fetch-pack using
its --stdin option, we use it in the remote-curl helper to bypass the
OS command line length limit.

Signed-off-by: Ivan Todoroski <grnch@gmx.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/remote-curl.c b/remote-curl.c
index 48c20b86f3cfc6c189972718046a6890aaefacf3..543f2be8b00159e6715f288c624307e5927957fb 100644 (file)
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -290,6 +290,7 @@ static void output_refs(struct ref *refs)
 struct rpc_state {
        const char *service_name;
        const char **argv;
+       struct strbuf *stdin_preamble;
        char *service_url;
        char *hdr_content_type;
        char *hdr_accept;
@@ -535,6 +536,7 @@ static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 {
        const char *svc = rpc->service_name;
        struct strbuf buf = STRBUF_INIT;
+       struct strbuf *preamble = rpc->stdin_preamble;
        struct child_process client;
        int err = 0;
 
@@ -545,6 +547,8 @@ static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
        client.argv = rpc->argv;
        if (start_command(&client))
                exit(1);
+       if (preamble)
+               write_or_die(client.in, preamble->buf, preamble->len);
        if (heads)
                write_or_die(client.in, heads->buf, heads->len);
 
@@ -626,13 +630,14 @@ static int fetch_git(struct discovery *heads,
        int nr_heads, struct ref **to_fetch)
 {
        struct rpc_state rpc;
+       struct strbuf preamble = STRBUF_INIT;
        char *depth_arg = NULL;
-       const char **argv;
        int argc = 0, i, err;
+       const char *argv[15];
 
-       argv = xmalloc((15 + nr_heads) * sizeof(char*));
        argv[argc++] = "fetch-pack";
        argv[argc++] = "--stateless-rpc";
+       argv[argc++] = "--stdin";
        argv[argc++] = "--lock-pack";
        if (options.followtags)
                argv[argc++] = "--include-tag";
@@ -651,24 +656,27 @@ static int fetch_git(struct discovery *heads,
                argv[argc++] = depth_arg;
        }
        argv[argc++] = url;
+       argv[argc++] = NULL;
+
        for (i = 0; i < nr_heads; i++) {
                struct ref *ref = to_fetch[i];
                if (!ref->name || !*ref->name)
                        die("cannot fetch by sha1 over smart http");
-               argv[argc++] = ref->name;
+               packet_buf_write(&preamble, "%s\n", ref->name);
        }
-       argv[argc++] = NULL;
+       packet_buf_flush(&preamble);
 
        memset(&rpc, 0, sizeof(rpc));
        rpc.service_name = "git-upload-pack",
        rpc.argv = argv;
+       rpc.stdin_preamble = &preamble;
        rpc.gzip_request = 1;
 
        err = rpc_service(&rpc, heads);
        if (rpc.result.len)
                safe_write(1, rpc.result.buf, rpc.result.len);
        strbuf_release(&rpc.result);
-       free(argv);
+       strbuf_release(&preamble);
        free(depth_arg);
        return err;
 }