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From: Stefan Beller <sbeller@google.com>
To: git@vger.kernel.org
Cc: pclouds@gmail.com, peff@peff.net, gitster@pobox.com,
	Stefan Beller <sbeller@google.com>
Subject: [RFC/WIP PATCH 04/11] upload-pack-2: Implement the version 2 of upload-pack
Date: Tue, 26 May 2015 15:01:08 -0700	[thread overview]
Message-ID: <1432677675-5118-5-git-send-email-sbeller@google.com> (raw)
In-Reply-To: <1432677675-5118-1-git-send-email-sbeller@google.com>

In upload-pack-2 we send each capability in its own packet.
By reusing the advertise_capabilities and eventually setting it to
NULL we will be able to reuse the methods for refs advertisement.

Signed-off-by: Stefan Beller <sbeller@google.com>
---
 .gitignore      |  1 +
 Makefile        |  2 ++
 upload-pack-2.c |  1 +
 upload-pack.c   | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 4 files changed, 78 insertions(+), 3 deletions(-)
 create mode 120000 upload-pack-2.c

diff --git a/.gitignore b/.gitignore
index a052419..a3c8ab9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -165,6 +165,7 @@
 /git-update-server-info
 /git-upload-archive
 /git-upload-pack
+/git-upload-pack-2
 /git-var
 /git-verify-commit
 /git-verify-pack
diff --git a/Makefile b/Makefile
index 25a453b..0f3ee41 100644
--- a/Makefile
+++ b/Makefile
@@ -560,6 +560,7 @@ PROGRAM_OBJS += sh-i18n--envsubst.o
 PROGRAM_OBJS += shell.o
 PROGRAM_OBJS += show-index.o
 PROGRAM_OBJS += upload-pack.o
+PROGRAM_OBJS += upload-pack-2.o
 PROGRAM_OBJS += remote-testsvn.o
 
 # Binary suffix, set to .exe for Windows builds
@@ -625,6 +626,7 @@ OTHER_PROGRAMS = git$X
 # what test wrappers are needed and 'install' will install, in bindir
 BINDIR_PROGRAMS_NEED_X += git
 BINDIR_PROGRAMS_NEED_X += git-upload-pack
+BINDIR_PROGRAMS_NEED_X += git-upload-pack-2
 BINDIR_PROGRAMS_NEED_X += git-receive-pack
 BINDIR_PROGRAMS_NEED_X += git-upload-archive
 BINDIR_PROGRAMS_NEED_X += git-shell
diff --git a/upload-pack-2.c b/upload-pack-2.c
new file mode 120000
index 0000000..e30a871
--- /dev/null
+++ b/upload-pack-2.c
@@ -0,0 +1 @@
+upload-pack.c
\ No newline at end of file
diff --git a/upload-pack.c b/upload-pack.c
index a5f75b7..84f9ee3 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -716,10 +716,47 @@ static void format_symref_info(struct strbuf *buf, struct string_list *symref)
 		strbuf_addf(buf, " symref=%s:%s", item->string, (char *)item->util);
 }
 
-static const char *advertise_capabilities = "multi_ack thin-pack side-band"
+static char *advertise_capabilities = "multi_ack thin-pack side-band"
 		" side-band-64k ofs-delta shallow no-progress"
 		" include-tag multi_ack_detailed";
 
+/*
+ * Reads the next capability and puts it into dst as a null terminated string.
+ * Returns true if more capabilities can be read.
+ * */
+static int next_capability(char *dst)
+{
+	int len = 0;
+	if (!*advertise_capabilities) {
+		/* make sure to not advertise capabilities afterwards */
+		advertise_capabilities = NULL;
+		return 0;
+	}
+
+	while (advertise_capabilities[len] != '\0' &&
+	       advertise_capabilities[len] != ' ')
+		len ++;
+	strncpy(dst, advertise_capabilities, len);
+	dst[len] = '\0';
+
+	advertise_capabilities += len;
+	if (*advertise_capabilities == ' ')
+		advertise_capabilities++;
+
+	return 1;
+}
+
+static void send_capabilities(void)
+{
+	char buf[100];
+
+	while (next_capability(buf))
+		packet_write(1, "capability:%s\n", buf);
+
+	packet_write(1, "agent:%s\n", git_user_agent_sanitized());
+	packet_flush(1);
+}
+
 static int send_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
 {
 
@@ -794,6 +831,28 @@ static void upload_pack(void)
 	}
 }
 
+static void receive_capabilities(void)
+{
+	int done = 0;
+	while (1) {
+		char *line = packet_read_line(0, NULL);
+		if (!line)
+			break;
+		if (starts_with(line, "capability:"))
+			parse_features(line + strlen("capability:"));
+	}
+}
+
+static void upload_pack_version_2(void)
+{
+	send_capabilities();
+	receive_capabilities();
+
+	/* The rest of the protocol stays the same, capabilities advertising
+	   is disabled though. */
+	upload_pack();
+}
+
 static int upload_pack_config(const char *var, const char *value, void *unused)
 {
 	if (!strcmp("uploadpack.allowtipsha1inwant", var))
@@ -806,16 +865,24 @@ static int upload_pack_config(const char *var, const char *value, void *unused)
 	return parse_hide_refs_config(var, value, "uploadpack");
 }
 
+static int endswith(const char *teststring, const char *ending)
+{
+	int slen = strlen(teststring);
+	int elen = strlen(ending);
+	return !strcmp(teststring + slen - elen, ending);
+}
+
 int main(int argc, char **argv)
 {
 	char *dir;
+	const char *cmd;
 	int i;
 	int strict = 0;
 
 	git_setup_gettext();
 
 	packet_trace_identity("upload-pack");
-	git_extract_argv0_path(argv[0]);
+	cmd = git_extract_argv0_path(argv[0]);
 	check_replace_refs = 0;
 
 	for (i = 1; i < argc; i++) {
@@ -857,6 +924,10 @@ int main(int argc, char **argv)
 		die("'%s' does not appear to be a git repository", dir);
 
 	git_config(upload_pack_config, NULL);
-	upload_pack();
+
+	if (endswith(cmd, "-2"))
+		upload_pack_version_2();
+	else
+		upload_pack();
 	return 0;
 }
-- 
2.4.1.345.gab207b6.dirty

  parent reply	other threads:[~2015-05-26 22:01 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-26 22:01 [RFC/WIP PATCH 00/11] Protocol version 2, again! Stefan Beller
2015-05-26 22:01 ` [RFC/WIP PATCH 01/11] upload-pack: make client capability parsing code a separate function Stefan Beller
2015-05-26 22:01 ` [RFC/WIP PATCH 02/11] upload-pack: only accept capabilities on the first "want" line Stefan Beller
2015-05-26 22:17   ` Junio C Hamano
2015-05-26 22:20     ` Stefan Beller
2015-05-26 22:01 ` [RFC/WIP PATCH 03/11] upload-pack: move capabilities out of send_ref Stefan Beller
2015-05-26 22:01 ` Stefan Beller [this message]
2015-05-27  2:30   ` [RFC/WIP PATCH 04/11] upload-pack-2: Implement the version 2 of upload-pack Eric Sunshine
2015-05-27  6:35   ` Jeff King
2015-05-27 17:30     ` Eric Sunshine
2015-05-27 20:14       ` Jeff King
2015-05-27 17:40     ` Stefan Beller
2015-05-27 20:34       ` Jeff King
2015-05-27 20:45         ` Stefan Beller
2015-05-27 21:46           ` Jeff King
2015-05-26 22:01 ` [RFC/WIP PATCH 05/11] transport: add infrastructure to support a protocol version number Stefan Beller
2015-05-27  6:39   ` Jeff King
2015-05-27 19:01     ` Stefan Beller
2015-05-27 20:17       ` Jeff King
2015-05-27 19:10     ` Junio C Hamano
2015-05-26 22:01 ` [RFC/WIP PATCH 06/11] remote.h: add get_remote_capabilities, request_capabilities Stefan Beller
2015-05-27  3:25   ` Eric Sunshine
2015-05-27  6:50     ` Jeff King
2015-05-27 17:19       ` Eric Sunshine
2015-05-27 20:09         ` Jeff King
2015-05-27  6:45   ` Jeff King
2015-05-29 19:39     ` Stefan Beller
2015-05-29 22:08       ` Jeff King
2015-05-26 22:01 ` [RFC/WIP PATCH 07/11] fetch-pack: use the configured transport protocol Stefan Beller
2015-05-26 22:19   ` Junio C Hamano
2015-05-26 22:23     ` Stefan Beller
2015-05-27  6:53   ` Jeff King
2015-05-26 22:01 ` [RFC/WIP PATCH 08/11] transport: connect_setup appends protocol version number Stefan Beller
2015-05-26 22:21   ` Junio C Hamano
2015-05-26 22:31     ` Stefan Beller
2015-05-27  5:09       ` Junio C Hamano
2015-05-27  6:56         ` Jeff King
2015-05-27  3:33   ` Eric Sunshine
2015-05-27  7:02   ` Jeff King
2015-05-26 22:01 ` [RFC/WIP PATCH 09/11] transport: get_refs_via_connect exchanges capabilities before refs Stefan Beller
2015-05-27  5:37   ` Eric Sunshine
2015-05-27  7:06   ` Jeff King
2015-05-26 22:01 ` [RFC/WIP PATCH 10/11] t5544: add a test case for the new protocol Stefan Beller
2015-05-27  5:34   ` Eric Sunshine
2015-05-27  7:12   ` Jeff King
2015-05-26 22:01 ` [RFC/WIP PATCH 11/11] Document protocol version 2 Stefan Beller
2015-05-29 20:35   ` Junio C Hamano
2015-05-29 21:36     ` Stefan Beller
2015-05-29 21:52       ` Junio C Hamano
2015-05-29 22:21         ` Jeff King
2015-06-01 23:14           ` Stefan Beller
2015-06-01 23:40             ` Stefan Beller
2015-06-04 13:18               ` Jeff King
2015-06-04 17:01                 ` Junio C Hamano
2015-06-02 17:06             ` Junio C Hamano
2015-05-27  6:18 ` [RFC/WIP PATCH 00/11] Protocol version 2, again! Jeff King
2015-05-27  7:08   ` Jeff King
2015-06-01 17:49     ` Stefan Beller
2015-06-02 10:10       ` Duy Nguyen
2015-06-04 13:09       ` Jeff King
2015-06-04 16:44         ` Stefan Beller

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