The fast-import commands 'cat-blob' and 'ls' can be used by remote-helpers
to retrieve information about blobs and trees that already exist in
fast-import's memory. This requires a channel from fast-import to the
remote-helper.
remote-helpers that use these features shall advertise the new 'bidi-import'
capability to signal that they require the communication channel.
When forking fast-import in transport-helper.c connect it to a dup of
the remote-helper's stdin-pipe. The additional file descriptor is passed
to fast-import via its command line (--cat-blob-fd).
It follows that git and fast-import are connected to the remote-helpers's
stdin.
Because git can send multiple commands to the remote-helper on it's stdin,
it is required that helpers that advertise 'bidi-import' buffer all input
commands until the batch of 'import' commands is ended by a newline
before sending data to fast-import.
This is to prevent mixing commands and fast-import responses on the
helper's stdin.
Signed-off-by: Florian Achleitner <florian.achleitner.2.6.31@xxxxxxxxx>
---
transport-helper.c | 44 +++++++++++++++++++++++++++++++-------------
1 file changed, 31 insertions(+), 13 deletions(-)
diff --git a/transport-helper.c b/transport-helper.c
index cfe0988..3523f1f 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -10,6 +10,7 @@
#include "string-list.h"
#include "thread-utils.h"
#include "sigchain.h"
+#include "argv-array.h"
static int debug;
@@ -19,6 +20,7 @@ struct helper_data {
FILE *out;
unsigned fetch : 1,
import : 1,
+ bidi_import : 1,
export : 1,
option : 1,
push : 1,
@@ -101,6 +103,7 @@ static void do_take_over(struct transport *transport)
static struct child_process *get_helper(struct transport *transport)
{
struct helper_data *data = transport->data;
+ struct argv_array argv = ARGV_ARRAY_INIT;
struct strbuf buf = STRBUF_INIT;
struct child_process *helper;
const char **refspecs = NULL;
@@ -122,11 +125,10 @@ static struct child_process *get_helper(struct transport *transport)
helper->in = -1;
helper->out = -1;
helper->err = 0;
- helper->argv = xcalloc(4, sizeof(*helper->argv));
- strbuf_addf(&buf, "git-remote-%s", data->name);
- helper->argv[0] = strbuf_detach(&buf, NULL);
- helper->argv[1] = transport->remote->name;
- helper->argv[2] = remove_ext_force(transport->url);
+ argv_array_pushf(&argv, "git-remote-%s", data->name);
+ argv_array_push(&argv, transport->remote->name);
+ argv_array_push(&argv, remove_ext_force(transport->url));
+ helper->argv = argv_array_detach(&argv, NULL);
helper->git_cmd = 0;
helper->silent_exec_failure = 1;
@@ -178,6 +180,8 @@ static struct child_process *get_helper(struct transport *transport)
data->push = 1;
else if (!strcmp(capname, "import"))
data->import = 1;
+ else if (!strcmp(capname, "bidi-import"))
+ data->bidi_import = 1;
else if (!strcmp(capname, "export"))
data->export = 1;
else if (!data->refspecs && !prefixcmp(capname, "refspec ")) {
@@ -241,8 +245,7 @@ static int disconnect_helper(struct transport *transport)
close(data->helper->out);
fclose(data->out);
res = finish_command(data->helper);
- free((char *)data->helper->argv[0]);
- free(data->helper->argv);
+ argv_array_free_detached(data->helper->argv);
free(data->helper);
data->helper = NULL;
}
@@ -376,14 +379,23 @@ static int fetch_with_fetch(struct transport *transport,
static int get_importer(struct transport *transport, struct child_process *fastimport)
{
struct child_process *helper = get_helper(transport);
+ struct helper_data *data = transport->data;
+ struct argv_array argv = ARGV_ARRAY_INIT;
+ int cat_blob_fd, code;
memset(fastimport, 0, sizeof(*fastimport));
fastimport->in = helper->out;
- fastimport->argv = xcalloc(5, sizeof(*fastimport->argv));
- fastimport->argv[0] = "fast-import";
- fastimport->argv[1] = "--quiet";
+ argv_array_push(&argv, "fast-import");
+ argv_array_push(&argv, "--quiet");
+ if (data->bidi_import) {
+ cat_blob_fd = xdup(helper->in);
+ argv_array_pushf(&argv, "--cat-blob-fd=%d", cat_blob_fd);
+ }
+ fastimport->argv = argv.argv;
fastimport->git_cmd = 1;
- return start_command(fastimport);
+
+ code = start_command(fastimport);
+ return code;
}
static int get_exporter(struct transport *transport,
@@ -438,11 +450,17 @@ static int fetch_with_import(struct transport *transport,
}
write_constant(data->helper->in, "\n");
+ /*
+ * remote-helpers that advertise the bidi-import capability are required to
+ * buffer the complete batch of import commands until this newline before
+ * sending data to fast-import.
+ * These helpers read back data from fast-import on their stdin, which could
+ * be mixed with import commands, otherwise.
+ */
if (finish_command(&fastimport))
die("Error while running fast-import");
- free(fastimport.argv);
- fastimport.argv = NULL;
+ argv_array_free_detached(fastimport.argv);
/*
* The fast-import stream of a remote helper that advertises
--
1.7.9.5
--
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