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authorShawn O. Pearce <spearce@spearce.org>2009-10-31 00:47:28 (GMT)
committerJunio C Hamano <gitster@pobox.com>2009-10-31 02:20:54 (GMT)
commit292ce46b60e2c12450c5c21044acf9c41bd837df (patch)
tree0db25466b9bc4f695240b1b9b0e79bfec30d9c4b
parentcff7123c11aa2b1a849a46028d60b4bc0ab54c51 (diff)
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remote-helpers: Fetch more than one ref in a batch
Some network protocols (e.g. native git://) are able to fetch more than one ref at a time and reduce the overall transfer cost by combining the requests into a single exchange. Instead of feeding each fetch request one at a time to the helper, feed all of them at once so the helper can decide whether or not it should batch them. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> CC: Daniel Barkalow <barkalow@iabervon.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--Documentation/git-remote-helpers.txt14
-rw-r--r--remote-curl.c88
-rw-r--r--transport-helper.c39
3 files changed, 115 insertions, 26 deletions
diff --git a/Documentation/git-remote-helpers.txt b/Documentation/git-remote-helpers.txt
index 173ee23..e44d821 100644
--- a/Documentation/git-remote-helpers.txt
+++ b/Documentation/git-remote-helpers.txt
@@ -36,10 +36,16 @@ Commands are given by the caller on the helper's standard input, one per line.
complete list, outputs a blank line.
'fetch' <sha1> <name>::
- Fetches the given object, writing the necessary objects to the
- database. Outputs a blank line when the fetch is
- complete. Only objects which were reported in the ref list
- with a sha1 may be fetched this way.
+ Fetches the given object, writing the necessary objects
+ to the database. Fetch commands are sent in a batch, one
+ per line, and the batch is terminated with a blank line.
+ Outputs a single blank line when all fetch commands in the
+ same batch are complete. Only objects which were reported
+ in the ref list with a sha1 may be fetched this way.
++
+Optionally may output a 'lock <file>' line indicating a file under
+GIT_DIR/objects/pack which is keeping a pack until refs can be
+suitably updated.
+
Supported if the helper has the "fetch" capability.
diff --git a/remote-curl.c b/remote-curl.c
index 478f3ea..22cd5c5 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -87,6 +87,81 @@ static struct ref *get_refs(void)
return refs;
}
+static int fetch_dumb(int nr_heads, struct ref **to_fetch)
+{
+ char **targets = xmalloc(nr_heads * sizeof(char*));
+ int ret, i;
+
+ for (i = 0; i < nr_heads; i++)
+ targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
+
+ init_walker();
+ walker->get_all = 1;
+ walker->get_tree = 1;
+ walker->get_history = 1;
+ walker->get_verbosely = 0;
+ walker->get_recover = 0;
+ ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
+
+ for (i = 0; i < nr_heads; i++)
+ free(targets[i]);
+ free(targets);
+
+ return ret ? error("Fetch failed.") : 0;
+}
+
+static void parse_fetch(struct strbuf *buf)
+{
+ struct ref **to_fetch = NULL;
+ struct ref *list_head = NULL;
+ struct ref **list = &list_head;
+ int alloc_heads = 0, nr_heads = 0;
+
+ do {
+ if (!prefixcmp(buf->buf, "fetch ")) {
+ char *p = buf->buf + strlen("fetch ");
+ char *name;
+ struct ref *ref;
+ unsigned char old_sha1[20];
+
+ if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
+ die("protocol error: expected sha/ref, got %s'", p);
+ if (p[40] == ' ')
+ name = p + 41;
+ else if (!p[40])
+ name = "";
+ else
+ die("protocol error: expected sha/ref, got %s'", p);
+
+ ref = alloc_ref(name);
+ hashcpy(ref->old_sha1, old_sha1);
+
+ *list = ref;
+ list = &ref->next;
+
+ ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
+ to_fetch[nr_heads++] = ref;
+ }
+ else
+ die("http transport does not support %s", buf->buf);
+
+ strbuf_reset(buf);
+ if (strbuf_getline(buf, stdin, '\n') == EOF)
+ return;
+ if (!*buf->buf)
+ break;
+ } while (1);
+
+ if (fetch_dumb(nr_heads, to_fetch))
+ exit(128); /* error already reported */
+ free_refs(list_head);
+ free(to_fetch);
+
+ printf("\n");
+ fflush(stdout);
+ strbuf_reset(buf);
+}
+
int main(int argc, const char **argv)
{
struct strbuf buf = STRBUF_INIT;
@@ -110,17 +185,8 @@ int main(int argc, const char **argv)
if (strbuf_getline(&buf, stdin, '\n') == EOF)
break;
if (!prefixcmp(buf.buf, "fetch ")) {
- char *obj = buf.buf + strlen("fetch ");
- init_walker();
- walker->get_all = 1;
- walker->get_tree = 1;
- walker->get_history = 1;
- walker->get_verbosely = 0;
- walker->get_recover = 0;
- if (walker_fetch(walker, 1, &obj, NULL, NULL))
- die("Fetch failed.");
- printf("\n");
- fflush(stdout);
+ parse_fetch(&buf);
+
} else if (!strcmp(buf.buf, "list")) {
struct ref *refs = get_refs();
struct ref *posn;
diff --git a/transport-helper.c b/transport-helper.c
index f57e84c..9de3408 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -10,6 +10,7 @@ struct helper_data
{
const char *name;
struct child_process *helper;
+ FILE *out;
unsigned fetch : 1;
};
@@ -18,7 +19,6 @@ static struct child_process *get_helper(struct transport *transport)
struct helper_data *data = transport->data;
struct strbuf buf = STRBUF_INIT;
struct child_process *helper;
- FILE *file;
if (data->helper)
return data->helper;
@@ -39,9 +39,9 @@ static struct child_process *get_helper(struct transport *transport)
write_str_in_full(helper->in, "capabilities\n");
- file = xfdopen(helper->out, "r");
+ data->out = xfdopen(helper->out, "r");
while (1) {
- if (strbuf_getline(&buf, file, '\n') == EOF)
+ if (strbuf_getline(&buf, data->out, '\n') == EOF)
exit(128); /* child died, message supplied already */
if (!*buf.buf)
@@ -58,6 +58,7 @@ static int disconnect_helper(struct transport *transport)
if (data->helper) {
write_str_in_full(data->helper->in, "\n");
close(data->helper->in);
+ fclose(data->out);
finish_command(data->helper);
free((char *)data->helper->argv[0]);
free(data->helper->argv);
@@ -70,8 +71,7 @@ static int disconnect_helper(struct transport *transport)
static int fetch_with_fetch(struct transport *transport,
int nr_heads, const struct ref **to_fetch)
{
- struct child_process *helper = get_helper(transport);
- FILE *file = xfdopen(helper->out, "r");
+ struct helper_data *data = transport->data;
int i;
struct strbuf buf = STRBUF_INIT;
@@ -82,12 +82,30 @@ static int fetch_with_fetch(struct transport *transport,
strbuf_addf(&buf, "fetch %s %s\n",
sha1_to_hex(posn->old_sha1), posn->name);
- write_in_full(helper->in, buf.buf, buf.len);
- strbuf_reset(&buf);
+ }
- if (strbuf_getline(&buf, file, '\n') == EOF)
+ strbuf_addch(&buf, '\n');
+ if (write_in_full(data->helper->in, buf.buf, buf.len) != buf.len)
+ die_errno("cannot send fetch to %s", data->name);
+
+ while (1) {
+ strbuf_reset(&buf);
+ if (strbuf_getline(&buf, data->out, '\n') == EOF)
exit(128); /* child died, message supplied already */
+
+ if (!prefixcmp(buf.buf, "lock ")) {
+ const char *name = buf.buf + 5;
+ if (transport->pack_lockfile)
+ warning("%s also locked %s", data->name, name);
+ else
+ transport->pack_lockfile = xstrdup(name);
+ }
+ else if (!buf.len)
+ break;
+ else
+ warning("%s unexpectedly said: '%s'", data->name, buf.buf);
}
+ strbuf_release(&buf);
return 0;
}
@@ -113,21 +131,20 @@ static int fetch(struct transport *transport,
static struct ref *get_refs_list(struct transport *transport, int for_push)
{
+ struct helper_data *data = transport->data;
struct child_process *helper;
struct ref *ret = NULL;
struct ref **tail = &ret;
struct ref *posn;
struct strbuf buf = STRBUF_INIT;
- FILE *file;
helper = get_helper(transport);
write_str_in_full(helper->in, "list\n");
- file = xfdopen(helper->out, "r");
while (1) {
char *eov, *eon;
- if (strbuf_getline(&buf, file, '\n') == EOF)
+ if (strbuf_getline(&buf, data->out, '\n') == EOF)
exit(128); /* child died, message supplied already */
if (!*buf.buf)