Add support for taking over transports that turn out to be smart.
Signed-off-by: Ilari Liusvaara <ilari.liusvaara@xxxxxxxxxxx>
---
transport-helper.c | 28 ++++++++++++++++++++++++-
transport.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++----
transport.h | 10 +++++++++
3 files changed, 89 insertions(+), 6 deletions(-)
diff --git a/transport-helper.c b/transport-helper.c
index 95aaa02..3d99fe1 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -22,6 +22,7 @@ struct helper_data
/* These go from remote name (as in "list") to private name */
struct refspec *refspecs;
int refspec_nr;
+ struct git_transport_options gitoptions;
};
static void sendline(struct helper_data *helper, struct strbuf *buffer)
@@ -63,6 +64,15 @@ static void write_constant(int fd, const char *str)
die_errno("Full write to remote helper failed");
}
+static struct child_process* helper_disown(struct transport *transport)
+{
+ struct helper_data *data = transport->data;
+ struct child_process *child = data->helper;
+ fclose(data->out);
+ free(data);
+ return child;
+}
+
const char* remove_ext_force(const char* url)
{
const char* url2 = url;
@@ -91,6 +101,7 @@ static struct child_process *get_helper(struct transport *transport)
const char **refspecs = NULL;
int refspec_nr = 0;
int refspec_alloc = 0;
+ int duped;
if (data->helper)
return data->helper;
@@ -109,9 +120,21 @@ static struct child_process *get_helper(struct transport *transport)
die("Unable to run helper: git %s", helper->argv[0]);
data->helper = helper;
+ /* Open the output as FILE* so strbuf_getline() can be used.
+ Do this with duped fd because fclose() will close the fd,
+ and stuff like disowning will require the fd to remain.
+
+ Set the stream to unbuffered because some reads are critical
+ in sense that any overreading will cause deadlocks.
+ */
+ duped = dup(helper->out);
+ if (duped < 0)
+ die_errno("Can't dup helper output fd");
+ data->out = xfdopen(duped, "r");
+ setvbuf(data->out, NULL, _IONBF, 0);
+
write_constant(helper->in, "capabilities\n");
- data->out = xfdopen(helper->out, "r");
while (1) {
const char* capname;
int mandatory = 0;
@@ -171,6 +194,7 @@ static int disconnect_helper(struct transport *transport)
strbuf_addf(&buf, "\n");
sendline(data, &buf);
close(data->helper->in);
+ close(data->helper->out);
fclose(data->out);
finish_command(data->helper);
free((char *)data->helper->argv[0]);
@@ -590,5 +614,7 @@ int transport_helper_init(struct transport *transport, const char *name)
transport->fetch = fetch;
transport->push_refs = push_refs;
transport->disconnect = release_helper;
+ transport->disown = helper_disown;
+ transport->smart_options = &(data->gitoptions);
return 0;
}
diff --git a/transport.c b/transport.c
index deaf983..e9802e3 100644
--- a/transport.c
+++ b/transport.c
@@ -398,6 +398,7 @@ struct git_transport_data {
struct git_transport_options options;
struct child_process *conn;
int fd[2];
+ unsigned got_remote_heads : 1;
struct extra_have_objects extra_have;
};
@@ -432,10 +433,15 @@ static int set_git_option(struct git_transport_options *opts,
static int connect_setup(struct transport *transport, int for_push, int verbose)
{
struct git_transport_data *data = transport->data;
+
+ if (data->conn)
+ return 0;
+
data->conn = git_connect(data->fd, transport->url,
for_push ? data->options.receivepack :
data->options.uploadpack,
verbose ? CONNECT_VERBOSE : 0);
+
return 0;
}
@@ -447,6 +453,7 @@ static struct ref *get_refs_via_connect(struct transport *transport, int for_pus
connect_setup(transport, for_push, 0);
get_remote_heads(data->fd[0], &refs, 0, NULL,
for_push ? REF_NORMAL : 0, &data->extra_have);
+ data->got_remote_heads = 1;
return refs;
}
@@ -477,9 +484,10 @@ static int fetch_refs_via_pack(struct transport *transport,
for (i = 0; i < nr_heads; i++)
origh[i] = heads[i] = xstrdup(to_fetch[i]->name);
- if (!data->conn) {
+ if (!data->got_remote_heads) {
connect_setup(transport, 0, 0);
get_remote_heads(data->fd[0], &refs_tmp, 0, NULL, 0, NULL);
+ data->got_remote_heads = 1;
}
refs = fetch_pack(&args, data->fd, data->conn,
@@ -490,6 +498,7 @@ static int fetch_refs_via_pack(struct transport *transport,
if (finish_connect(data->conn))
refs = NULL;
data->conn = NULL;
+ data->got_remote_heads = 0;
free_refs(refs_tmp);
@@ -718,12 +727,13 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re
struct send_pack_args args;
int ret;
- if (!data->conn) {
+ if (!data->got_remote_heads) {
struct ref *tmp_refs;
connect_setup(transport, 1, 0);
get_remote_heads(data->fd[0], &tmp_refs, 0, NULL, REF_NORMAL,
NULL);
+ data->got_remote_heads = 1;
}
memset(&args, 0, sizeof(args));
@@ -741,6 +751,7 @@ static int git_transport_push(struct transport *transport, struct ref *remote_re
close(data->fd[0]);
ret |= finish_connect(data->conn);
data->conn = NULL;
+ data->got_remote_heads = 0;
return ret;
}
@@ -749,7 +760,8 @@ static int disconnect_git(struct transport *transport)
{
struct git_transport_data *data = transport->data;
if (data->conn) {
- packet_flush(data->fd[1]);
+ if (data->got_remote_heads)
+ packet_flush(data->fd[1]);
close(data->fd[0]);
close(data->fd[1]);
finish_connect(data->conn);
@@ -759,6 +771,35 @@ static int disconnect_git(struct transport *transport)
return 0;
}
+void transport_take_over(struct transport *transport)
+{
+ struct git_transport_data *data;
+
+ if (!transport->disown)
+ die("Bug detected: Taking over transport requires non-NULL "
+ "disown method.");
+ if (!transport->smart_options)
+ die("Bug detected: Taking over transport requires non-NULL "
+ "smart_options field.");
+
+ data = xcalloc(1, sizeof(*data));
+ data->options = *transport->smart_options;
+ data->conn = transport->disown(transport);
+ data->fd[0] = data->conn->out;
+ data->fd[1] = data->conn->in;
+ data->got_remote_heads = 0;
+ transport->data = data;
+
+ transport->set_option = NULL;
+ transport->get_refs_list = get_refs_via_connect;
+ transport->fetch = fetch_refs_via_pack;
+ transport->push = NULL;
+ transport->push_refs = git_transport_push;
+ transport->disconnect = disconnect_git;
+ transport->smart_options = &(data->options);
+ transport->disown = NULL;
+}
+
static int is_local(const char *url)
{
const char *colon = strchr(url, ':');
@@ -854,6 +895,7 @@ struct transport *transport_get(struct remote *remote, const char *url)
ret->fetch = fetch_objs_via_rsync;
ret->push = rsync_transport_push;
ret->smart_options = NULL;
+ ret->disown = NULL;
} else if (is_local(url) && is_file(url)) {
struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
ret->data = data;
@@ -861,6 +903,7 @@ struct transport *transport_get(struct remote *remote, const char *url)
ret->fetch = fetch_refs_from_bundle;
ret->disconnect = close_bundle;
ret->smart_options = NULL;
+ ret->disown = NULL;
} else if (!is_url(url)
|| !prefixcmp(url, "file://")
|| !prefixcmp(url, "git://")
@@ -876,8 +919,10 @@ struct transport *transport_get(struct remote *remote, const char *url)
ret->push_refs = git_transport_push;
ret->disconnect = disconnect_git;
ret->smart_options = &(data->options);
+ ret->disown = NULL;
data->conn = NULL;
+ data->got_remote_heads = 0;
} else if (!prefixcmp(url, "http://";)
|| !prefixcmp(url, "https://";)
|| !prefixcmp(url, "ftp://";)) {
@@ -938,9 +983,9 @@ int transport_push(struct transport *transport,
*nonfastforward = 0;
verify_remote_names(refspec_nr, refspec);
- if (transport->push)
+ if (transport->push) {
return transport->push(transport, refspec_nr, refspec, flags);
- if (transport->push_refs) {
+ } else if (transport->push_refs) {
struct ref *remote_refs =
transport->get_refs_list(transport, 1);
struct ref *local_refs = get_local_heads();
@@ -984,6 +1029,7 @@ const struct ref *transport_get_remote_refs(struct transport *transport)
{
if (!transport->remote_refs)
transport->remote_refs = transport->get_refs_list(transport, 0);
+
return transport->remote_refs;
}
@@ -1018,6 +1064,7 @@ int transport_fetch_refs(struct transport *transport, struct ref *refs)
}
rc = transport->fetch(transport, nr_heads, heads);
+
free(heads);
return rc;
}
diff --git a/transport.h b/transport.h
index d0192f9..499962d 100644
--- a/transport.h
+++ b/transport.h
@@ -65,6 +65,15 @@ struct transport {
int (*push_refs)(struct transport *transport, struct ref *refs, int flags);
int (*push)(struct transport *connection, int refspec_nr, const char **refspec, int flags);
+ /**
+ * Disown the transport helper. Releases all resources used
+ * by field pointed by member data, except that the child
+ * process is not released but returned and whatever is pointed
+ * by smart transport options structure is not freed (but the
+ * smart transport options structure itself is).
+ **/
+ struct child_process* (*disown)(struct transport* connection);
+
/** get_refs_list(), fetch(), and push_refs() can keep
* resources (such as a connection) reserved for futher
* use. disconnect() releases these resources.
@@ -128,6 +137,7 @@ int transport_fetch_refs(struct transport *transport, struct ref *refs);
void transport_unlock_pack(struct transport *transport);
int transport_disconnect(struct transport *transport);
char *transport_anonymize_url(const char *url);
+void transport_take_over(struct transport *transport);
/* Transport methods defined outside transport.c */
int transport_helper_init(struct transport *transport, const char *name);
--
1.6.6.rc1.300.gfbc27
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