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From: Christian Couder <christian.couder@gmail.com>
To: git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>, Jeff King <peff@peff.net>,
	Ben Peart <Ben.Peart@microsoft.com>,
	Nguyen Thai Ngoc Duy <pclouds@gmail.com>,
	Mike Hommey <mh@glandium.org>,
	Lars Schneider <larsxschneider@gmail.com>,
	Eric Wong <e@80x24.org>,
	Christian Couder <chriscool@tuxfamily.org>
Subject: [RFC/PATCH v4 21/49] odb-helper: add 'store_plain_objects' to 'struct odb_helper'
Date: Tue, 20 Jun 2017 09:54:55 +0200	[thread overview]
Message-ID: <20170620075523.26961-22-chriscool@tuxfamily.org> (raw)
In-Reply-To: <20170620075523.26961-1-chriscool@tuxfamily.org>

This adds a configuration option odb.<helper>.plainObjects and the
corresponding boolean variable called 'store_plain_objects' in
'struct odb_helper' to make it possible for external object
databases to store object as plain objects instead of Git objects.

The existing odb_helper_fetch_object() is renamed
odb_helper_fetch_git_object() and a new odb_helper_fetch_plain_object()
is introduce to deal with external objects that are not in Git format.

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
---
 external-odb.c |   2 +
 odb-helper.c   | 113 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 odb-helper.h   |   1 +
 3 files changed, 114 insertions(+), 2 deletions(-)

diff --git a/external-odb.c b/external-odb.c
index a88837feda..d11fc98719 100644
--- a/external-odb.c
+++ b/external-odb.c
@@ -36,6 +36,8 @@ static int external_odb_config(const char *var, const char *value, void *data)
 
 	if (!strcmp(key, "command"))
 		return git_config_string(&o->cmd, var, value);
+	if (!strcmp(key, "plainobjects"))
+		o->store_plain_objects = git_config_bool(var, value);
 
 	return 0;
 }
diff --git a/odb-helper.c b/odb-helper.c
index af7cc55ca2..b33ee81c97 100644
--- a/odb-helper.c
+++ b/odb-helper.c
@@ -159,8 +159,107 @@ int odb_helper_has_object(struct odb_helper *o, const unsigned char *sha1)
 	return !!odb_helper_lookup(o, sha1);
 }
 
-int odb_helper_fetch_object(struct odb_helper *o, const unsigned char *sha1,
-			    int fd)
+static int odb_helper_fetch_plain_object(struct odb_helper *o,
+					 const unsigned char *sha1,
+					 int fd)
+{
+	struct odb_helper_object *obj;
+	struct odb_helper_cmd cmd;
+	unsigned long total_got = 0;
+
+	char hdr[32];
+	int hdrlen;
+
+	int ret = Z_STREAM_END;
+	unsigned char compressed[4096];
+	git_zstream stream;
+	git_SHA_CTX hash;
+	unsigned char real_sha1[20];
+
+	obj = odb_helper_lookup(o, sha1);
+	if (!obj)
+		return -1;
+
+	if (odb_helper_start(o, &cmd, 0, "get %s", sha1_to_hex(sha1)) < 0)
+		return -1;
+
+	/* Set it up */
+	git_deflate_init(&stream, zlib_compression_level);
+	stream.next_out = compressed;
+	stream.avail_out = sizeof(compressed);
+	git_SHA1_Init(&hash);
+
+	/* First header.. */
+	hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj->type), obj->size) + 1;
+	stream.next_in = (unsigned char *)hdr;
+	stream.avail_in = hdrlen;
+	while (git_deflate(&stream, 0) == Z_OK)
+		; /* nothing */
+	git_SHA1_Update(&hash, hdr, hdrlen);
+
+	for (;;) {
+		unsigned char buf[4096];
+		int r;
+
+		r = xread(cmd.child.out, buf, sizeof(buf));
+		if (r < 0) {
+			error("unable to read from odb helper '%s': %s",
+			      o->name, strerror(errno));
+			close(cmd.child.out);
+			odb_helper_finish(o, &cmd);
+			git_deflate_end(&stream);
+			return -1;
+		}
+		if (r == 0)
+			break;
+
+		total_got += r;
+
+		/* Then the data itself.. */
+		stream.next_in = (void *)buf;
+		stream.avail_in = r;
+		do {
+			unsigned char *in0 = stream.next_in;
+			ret = git_deflate(&stream, Z_FINISH);
+			git_SHA1_Update(&hash, in0, stream.next_in - in0);
+			write_or_die(fd, compressed, stream.next_out - compressed);
+			stream.next_out = compressed;
+			stream.avail_out = sizeof(compressed);
+		} while (ret == Z_OK);
+	}
+
+	close(cmd.child.out);
+	if (ret != Z_STREAM_END) {
+		warning("bad zlib data from odb helper '%s' for %s",
+			o->name, sha1_to_hex(sha1));
+		return -1;
+	}
+	ret = git_deflate_end_gently(&stream);
+	if (ret != Z_OK) {
+		warning("deflateEnd on object %s from odb helper '%s' failed (%d)",
+			sha1_to_hex(sha1), o->name, ret);
+		return -1;
+	}
+	git_SHA1_Final(real_sha1, &hash);
+	if (hashcmp(sha1, real_sha1)) {
+		warning("sha1 mismatch from odb helper '%s' for %s (got %s)",
+			o->name, sha1_to_hex(sha1), sha1_to_hex(real_sha1));
+		return -1;
+	}
+	if (odb_helper_finish(o, &cmd))
+		return -1;
+	if (total_got != obj->size) {
+		warning("size mismatch from odb helper '%s' for %s (%lu != %lu)",
+			o->name, sha1_to_hex(sha1), total_got, obj->size);
+		return -1;
+	}
+
+	return 0;
+}
+
+static int odb_helper_fetch_git_object(struct odb_helper *o,
+				       const unsigned char *sha1,
+				       int fd)
 {
 	struct odb_helper_object *obj;
 	struct odb_helper_cmd cmd;
@@ -248,6 +347,16 @@ int odb_helper_fetch_object(struct odb_helper *o, const unsigned char *sha1,
 	return 0;
 }
 
+int odb_helper_fetch_object(struct odb_helper *o,
+			    const unsigned char *sha1,
+			    int fd)
+{
+	if (o->store_plain_objects)
+		return odb_helper_fetch_plain_object(o, sha1, fd);
+	else
+		return odb_helper_fetch_git_object(o, sha1, fd);
+}
+
 int odb_helper_for_each_object(struct odb_helper *o,
 			       each_external_object_fn fn,
 			       void *data)
diff --git a/odb-helper.h b/odb-helper.h
index 4e321195e8..3953b9bbaf 100644
--- a/odb-helper.h
+++ b/odb-helper.h
@@ -6,6 +6,7 @@
 struct odb_helper {
 	const char *name;
 	const char *cmd;
+	int store_plain_objects;
 
 	struct odb_helper_object {
 		unsigned char sha1[20];
-- 
2.13.1.565.gbfcd7a9048


  parent reply	other threads:[~2017-06-20  7:58 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-20  7:54 [RFC/PATCH v4 00/49] Add initial experimental external ODB support Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 01/49] builtin/clone: get rid of 'value' strbuf Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 02/49] t0021/rot13-filter: refactor packet reading functions Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 03/49] t0021/rot13-filter: improve 'if .. elsif .. else' style Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 04/49] Add Git/Packet.pm from parts of t0021/rot13-filter.pl Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 05/49] t0021/rot13-filter: use Git/Packet.pm Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 06/49] Git/Packet.pm: improve error message Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 07/49] Git/Packet.pm: add packet_initialize() Christian Couder
2017-06-23 18:55   ` Ben Peart
2017-06-20  7:54 ` [RFC/PATCH v4 08/49] Git/Packet: add capability functions Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 09/49] Add initial external odb support Christian Couder
2017-06-23 19:49   ` Ben Peart
2017-06-20  7:54 ` [RFC/PATCH v4 10/49] external odb foreach Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 11/49] t0400: add 'put' command to odb-helper script Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 12/49] external odb: add write support Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 13/49] external-odb: accept only blobs for now Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 14/49] t0400: add test for external odb write support Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 15/49] Add GIT_NO_EXTERNAL_ODB env variable Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 16/49] Add t0410 to test external ODB transfer Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 17/49] lib-httpd: pass config file to start_httpd() Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 18/49] lib-httpd: add upload.sh Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 19/49] lib-httpd: add list.sh Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 20/49] lib-httpd: add apache-e-odb.conf Christian Couder
2017-06-20  7:54 ` Christian Couder [this message]
2017-06-20  7:54 ` [RFC/PATCH v4 22/49] pack-objects: don't pack objects in external odbs Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 23/49] t0420: add test with HTTP external odb Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 24/49] odb-helper: start fault in implementation Christian Couder
2017-06-20  7:54 ` [RFC/PATCH v4 25/49] external-odb: add external_odb_fault_in_object() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 26/49] odb-helper: add script_mode Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 27/49] Documentation: add read-object-protocol.txt Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 28/49] contrib: add long-running-read-object/example.pl Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 29/49] Add t0410 to test read object mechanism Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 30/49] odb-helper: add read_object_process() Christian Couder
2017-07-10 15:57   ` Ben Peart
2017-06-20  7:55 ` [RFC/PATCH v4 31/49] external-odb: add external_odb_get_capabilities() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 32/49] t04*: add 'get_cap' support to helpers Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 33/49] odb-helper: call odb_helper_lookup() with 'have' capability Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 34/49] odb-helper: fix odb_helper_fetch_object() for read_object Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 35/49] Add t0460 to test passing git objects Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 36/49] odb-helper: add read_packetized_git_object_to_fd() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 37/49] odb-helper: add read_packetized_plain_object_to_fd() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 38/49] Add t0470 to test passing plain objects Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 39/49] odb-helper: add write_object_process() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 40/49] Add t0480 to test "have" capability and plain objects Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 41/49] external-odb: add external_odb_do_fetch_object() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 42/49] odb-helper: advertise 'have' capability Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 43/49] odb-helper: advertise 'put' capability Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 44/49] odb-helper: add have_object_process() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 45/49] clone: add initial param to write_remote_refs() Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 46/49] clone: add --initial-refspec option Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 47/49] clone: disable external odb before initial clone Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 48/49] Add test for 'clone --initial-refspec' Christian Couder
2017-06-20  7:55 ` [RFC/PATCH v4 49/49] t: add t0430 to test cloning using bundles Christian Couder
2017-06-20 13:48 ` [RFC/PATCH v4 00/49] Add initial experimental external ODB support Christian Couder
2017-06-23 18:24 ` Ben Peart
2017-07-01 19:41   ` Christian Couder
2017-07-01 20:12     ` Christian Couder
2017-07-01 20:33     ` Junio C Hamano
2017-07-02  4:25       ` Christian Couder
2017-07-03 16:56         ` Junio C Hamano
2017-07-06 17:36     ` Ben Peart
2017-09-15 12:56       ` Christian Couder
2017-07-12 19:06 ` Jonathan Tan
2017-09-15 13:16   ` Christian Couder

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