[PATCH v3 0/4] support remote archive from stateless transport

From: Jiang Xin <zhiyou.jx@alibaba-inc.com>

"git archive --remote=<remote>" learned to talk over the smart http (aka stateless) transport.

range-diff v2...v3

1:  4497404900 = 1:  e660fc79b6 transport-helper: no connection restriction in connect_helper
-:  ---------- > 2:  e3dc18caa9 transport-helper: call do_take_over() in process_connect
2:  9bfaa1a904 ! 3:  01699822c3 transport-helper: run do_take_over in connect_helper
    @@ Metadata
     Author: Jiang Xin <zhiyou.jx@alibaba-inc.com>
     
      ## Commit message ##
    -    transport-helper: run do_take_over in connect_helper
    +    transport-helper: call do_take_over() in connect_helper
     
         After successfully connecting to the smart transport by calling
    -    "process_connect_service()" in "connect_helper()", run "do_take_over()"
    -    to replace the old vtable with a new one which has methods ready for
    -    the smart transport connection.
    +    process_connect_service() in connect_helper(), run do_take_over() to
    +    replace the old vtable with a new one which has methods ready for the
    +    smart transport connection.
     
    -    The subsequent commit introduces remote archive for a stateless-rpc
    -    connection. But without running "do_take_over()", it may fail to call
    -    "transport_disconnect()" in "run_remote_archiver()" of
    -    "builtin/archive.c". This is because for a stateless connection or a
    -    service like "git-upload-pack-archive", the remote helper may receive a
    -    SIGPIPE signal and exit early. To have a graceful disconnect method by
    -    calling "do_take_over()" will solve this issue.
    +    The connect_helper() function is used as the connect method of the
    +    vtable in "transport-helper.c", and it is called by transport_connect()
    +    in "transport.c" to setup a connection. The only place that we call
    +    transport_connect() so far is in "builtin/archive.c". Without running
    +    do_take_over(), it may fail to call transport_disconnect() in
    +    run_remote_archiver() of "builtin/archive.c". This is because for a
    +    stateless connection or a service like "git-upload-pack-archive", the
    +    remote helper may receive a SIGPIPE signal and exit early. To have a
    +    graceful disconnect method by calling do_take_over() will solve this
    +    issue.
    +
    +    The subsequent commit will introduce remote archive over a stateless-rpc
    +    connection.
     
         Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
     
3:  1e305394ee ! 4:  a38ac182d6 archive: support remote archive from stateless transport
    @@ Commit message
             capabilities when connecting to remote-helper, so do not send them
             in "remote-curl.c" for the "git-upload-archive" service.
     
    +    Helped-by: Eric Sunshine <sunshine@sunshineco.com>
         Signed-off-by: Jiang Xin <zhiyou.jx@alibaba-inc.com>
     
      ## http-backend.c ##
    @@ http-backend.c: static void check_content_type(struct strbuf *hdr, const char *a
      static void service_rpc(struct strbuf *hdr, char *service_name)
      {
     -	const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
    -+	const char *argv[4];
    ++	struct strvec argv = STRVEC_INIT;
      	struct rpc_service *svc = select_service(hdr, service_name);
      	struct strbuf buf = STRBUF_INIT;
      
    -+	if (!strcmp(service_name, "git-upload-archive")) {
    -+		argv[1] = ".";
    -+		argv[2] = NULL;
    -+	} else {
    -+		argv[1] = "--stateless-rpc";
    -+		argv[2] = ".";
    -+		argv[3] = NULL;
    -+	}
    ++	strvec_push(&argv, svc->name);
    ++	if (strcmp(service_name, "git-upload-archive"))
    ++		strvec_push(&argv, "--stateless-rpc");
    ++	strvec_push(&argv, ".");
     +
      	strbuf_reset(&buf);
      	strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
      	check_content_type(hdr, buf.buf);
    +@@ http-backend.c: static void service_rpc(struct strbuf *hdr, char *service_name)
    + 
    + 	end_headers(hdr);
    + 
    +-	argv[0] = svc->name;
    +-	run_service(argv, svc->buffer_input);
    ++	run_service(argv.v, svc->buffer_input);
    + 	strbuf_release(&buf);
    ++	strvec_clear(&argv);
    + }
    + 
    + static int dead;
     @@ http-backend.c: static struct service_cmd {
      	{"GET", "/objects/pack/pack-[0-9a-f]{64}\\.idx$", get_idx_file},
      
---

Jiang Xin (4):
  transport-helper: no connection restriction in connect_helper
  transport-helper: call do_take_over() in process_connect
  transport-helper: call do_take_over() in connect_helper
  archive: support remote archive from stateless transport

 http-backend.c         | 15 +++++++++++----
 remote-curl.c          | 14 +++++++++++---
 t/t5003-archive-zip.sh | 30 ++++++++++++++++++++++++++++++
 transport-helper.c     | 29 +++++++++++++----------------
 4 files changed, 65 insertions(+), 23 deletions(-)