On Sat, 28 Aug 2010, Sverre Rabbelier wrote:
> While this requires the helper to flush stdout after listing 'gitdir'
> as capability, and read a command (the 'gitdir' response from the
> remote helper infrastructure) right after that, this is more elegant
> and does not require an ad-hoc exchange of values.
>
> CC: Daniel Barkalow <barkalow@xxxxxxxxxxxx>
> ---
>
> Daniel made some fuss about the ad-hoc exchange when I first sent
> the 'export command' series for review, and it's been nagging me.
>
> As you can see in the remote-testgit implementation, it's a bit
> icky on the helper side (you have to flush sdout and read another
> command in the middle of responding to 'capabilities'), but I think
> it's better than the alternative.
I think I was annoyed by it being ad-hoc, rather than having the exchange
of values. I think if you need to get more information to the helper, you
should have a generic mechanism for that, rather than anything that cares
about the particular information involved.
I'm a bit unclear on what change you're making here; it looks like the
helper side is reading another line, but that transport-helper isn't
writing anything new, and you don't have any changes to the documentation
here. Did this change get mixed into a different patch or something?
> git-remote-testgit.py | 29 ++++++++++++++++-------------
> transport-helper.c | 47 ++++++++++++++++++-----------------------------
> 2 files changed, 34 insertions(+), 42 deletions(-)
>
> diff --git a/git-remote-testgit.py b/git-remote-testgit.py
> index 50341ce..e2b213d 100644
> --- a/git-remote-testgit.py
> +++ b/git-remote-testgit.py
> @@ -71,8 +71,24 @@ def do_capabilities(repo, args):
> print "import"
> print "export"
> print "gitdir"
> +
> + sys.stdout.flush()
> + if not read_one_line(repo):
> + die("Expected gitdir, got empty line")
> +
> print "refspec refs/heads/*:%s*" % repo.prefix
>
> + dirname = repo.get_base_path(repo.gitdir)
> +
> + if not os.path.exists(dirname):
> + os.makedirs(dirname)
> +
> + path = os.path.join(dirname, 'testgit.marks')
> +
> + print "*export-marks %s" % path
> + if os.path.exists(path):
> + print "*import-marks %s" % path
> +
> print # end capabilities
>
>
> @@ -142,19 +158,6 @@ def do_export(repo, args):
> if not repo.gitdir:
> die("Need gitdir to export")
>
> - dirname = repo.get_base_path(repo.gitdir)
> -
> - if not os.path.exists(dirname):
> - os.makedirs(dirname)
> -
> - path = os.path.join(dirname, 'testgit.marks')
> - print path
> - if os.path.exists(path):
> - print path
> - else:
> - print ""
> - sys.stdout.flush()
> -
> update_local_repo(repo)
> repo.importer.do_import(repo.gitdir)
> repo.non_local.push(repo.gitdir)
> diff --git a/transport-helper.c b/transport-helper.c
> index 82bdad3..0edc1d5 100644
> --- a/transport-helper.c
> +++ b/transport-helper.c
> @@ -23,6 +23,8 @@ struct helper_data
> push : 1,
> connect : 1,
> no_disconnect_req : 1;
> + char *export_marks;
> + char *import_marks;
> /* These go from remote name (as in "list") to private name */
> struct refspec *refspecs;
> int refspec_nr;
> @@ -179,6 +181,16 @@ static struct child_process *get_helper(struct transport *transport)
> strbuf_addf(&gitdir, "gitdir %s\n", get_git_dir());
> sendline(data, &gitdir);
> strbuf_release(&gitdir);
> + } else if (!prefixcmp(capname, "export-marks ")) {
> + struct strbuf arg = STRBUF_INIT;
> + strbuf_addstr(&arg, "--export-marks=");
> + strbuf_addstr(&arg, capname + strlen("export-marks "));
> + data->export_marks = strbuf_detach(&arg, NULL);
> + } else if (!prefixcmp(capname, "import-marks")) {
> + struct strbuf arg = STRBUF_INIT;
> + strbuf_addstr(&arg, "--import-marks=");
> + strbuf_addstr(&arg, capname + strlen("import-marks "));
> + data->import_marks = strbuf_detach(&arg, NULL);
> } else if (mandatory) {
> die("Unknown mandatory capability %s. This remote "
> "helper probably needs newer version of Git.\n",
> @@ -364,10 +376,9 @@ static int get_importer(struct transport *transport, struct child_process *fasti
>
> static int get_exporter(struct transport *transport,
> struct child_process *fastexport,
> - const char *export_marks,
> - const char *import_marks,
> struct string_list *revlist_args)
> {
> + struct helper_data *data = transport->data;
> struct child_process *helper = get_helper(transport);
> int argc = 0, i;
> memset(fastexport, 0, sizeof(*fastexport));
> @@ -378,10 +389,10 @@ static int get_exporter(struct transport *transport,
> fastexport->argv = xcalloc(5 + revlist_args->nr, sizeof(*fastexport->argv));
> fastexport->argv[argc++] = "fast-export";
> fastexport->argv[argc++] = "--use-done-feature";
> - if (export_marks)
> - fastexport->argv[argc++] = export_marks;
> - if (import_marks)
> - fastexport->argv[argc++] = import_marks;
> + if (data->export_marks)
> + fastexport->argv[argc++] = data->export_marks;
> + if (data->import_marks)
> + fastexport->argv[argc++] = data->import_marks;
>
> for (i = 0; i < revlist_args->nr; i++)
> fastexport->argv[argc++] = revlist_args->items[i].string;
> @@ -708,7 +719,6 @@ static int push_refs_with_export(struct transport *transport,
> struct ref *ref;
> struct child_process *helper, exporter;
> struct helper_data *data = transport->data;
> - char *export_marks = NULL, *import_marks = NULL;
> struct string_list revlist_args = { NULL, 0, 0 };
> struct strbuf buf = STRBUF_INIT;
>
> @@ -716,26 +726,6 @@ static int push_refs_with_export(struct transport *transport,
>
> write_constant(helper->in, "export\n");
>
> - recvline(data, &buf);
> - if (debug)
> - fprintf(stderr, "Debug: Got export_marks '%s'\n", buf.buf);
> - if (buf.len) {
> - struct strbuf arg = STRBUF_INIT;
> - strbuf_addstr(&arg, "--export-marks=");
> - strbuf_addbuf(&arg, &buf);
> - export_marks = strbuf_detach(&arg, NULL);
> - }
> -
> - recvline(data, &buf);
> - if (debug)
> - fprintf(stderr, "Debug: Got import_marks '%s'\n", buf.buf);
> - if (buf.len) {
> - struct strbuf arg = STRBUF_INIT;
> - strbuf_addstr(&arg, "--import-marks=");
> - strbuf_addbuf(&arg, &buf);
> - import_marks = strbuf_detach(&arg, NULL);
> - }
> -
> strbuf_reset(&buf);
>
> for (ref = remote_refs; ref; ref = ref->next) {
> @@ -754,8 +744,7 @@ static int push_refs_with_export(struct transport *transport,
>
> }
>
> - if (get_exporter(transport, &exporter,
> - export_marks, import_marks, &revlist_args))
> + if (get_exporter(transport, &exporter, &revlist_args))
> die("Couldn't run fast-export");
>
> if(finish_command(&exporter))
> --
> 1.7.2.1.240.g6a95c3
>
>
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