1 files changed, 110 insertions, 45 deletions

diff --git a/sha1-file.c b/sha1-file.c
index 03ae9ae93a..ccd34dd9e8 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -74,6 +74,11 @@ static void git_hash_sha1_init(git_hash_ctx *ctx)
 	git_SHA1_Init(&ctx->sha1);
 }
 
+static void git_hash_sha1_clone(git_hash_ctx *dst, const git_hash_ctx *src)
+{
+	git_SHA1_Clone(&dst->sha1, &src->sha1);
+}
+
 static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
 {
 	git_SHA1_Update(&ctx->sha1, data, len);
@@ -90,6 +95,11 @@ static void git_hash_sha256_init(git_hash_ctx *ctx)
 	git_SHA256_Init(&ctx->sha256);
 }
 
+static void git_hash_sha256_clone(git_hash_ctx *dst, const git_hash_ctx *src)
+{
+	git_SHA256_Clone(&dst->sha256, &src->sha256);
+}
+
 static void git_hash_sha256_update(git_hash_ctx *ctx, const void *data, size_t len)
 {
 	git_SHA256_Update(&ctx->sha256, data, len);
@@ -105,6 +115,11 @@ static void git_hash_unknown_init(git_hash_ctx *ctx)
 	BUG("trying to init unknown hash");
 }
 
+static void git_hash_unknown_clone(git_hash_ctx *dst, const git_hash_ctx *src)
+{
+	BUG("trying to clone unknown hash");
+}
+
 static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len)
 {
 	BUG("trying to update unknown hash");
@@ -123,6 +138,7 @@ const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
 		0,
 		0,
 		git_hash_unknown_init,
+		git_hash_unknown_clone,
 		git_hash_unknown_update,
 		git_hash_unknown_final,
 		NULL,
@@ -136,6 +152,7 @@ const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
 		GIT_SHA1_HEXSZ,
 		GIT_SHA1_BLKSZ,
 		git_hash_sha1_init,
+		git_hash_sha1_clone,
 		git_hash_sha1_update,
 		git_hash_sha1_final,
 		&empty_tree_oid,
@@ -149,6 +166,7 @@ const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
 		GIT_SHA256_HEXSZ,
 		GIT_SHA256_BLKSZ,
 		git_hash_sha256_init,
+		git_hash_sha256_clone,
 		git_hash_sha256_update,
 		git_hash_sha256_final,
 		&empty_tree_oid_sha256,
@@ -676,20 +694,15 @@ void add_to_alternates_memory(const char *reference)
 char *compute_alternate_path(const char *path, struct strbuf *err)
 {
 	char *ref_git = NULL;
-	const char *repo, *ref_git_s;
+	const char *repo;
 	int seen_error = 0;
 
-	ref_git_s = real_path_if_valid(path);
-	if (!ref_git_s) {
+	ref_git = real_pathdup(path, 0);
+	if (!ref_git) {
 		seen_error = 1;
 		strbuf_addf(err, _("path '%s' does not exist"), path);
 		goto out;
-	} else
-		/*
-		 * Beware: read_gitfile(), real_path() and mkpath()
-		 * return static buffer
-		 */
-		ref_git = xstrdup(ref_git_s);
+	}
 
 	repo = read_gitfile(ref_git);
 	if (!repo)
@@ -868,9 +881,7 @@ void prepare_alt_odb(struct repository *r)
 /* Returns 1 if we have successfully freshened the file, 0 otherwise. */
 static int freshen_file(const char *fn)
 {
-	struct utimbuf t;
-	t.actime = t.modtime = time(NULL);
-	return !utime(fn, &t);
+	return !utime(fn, NULL);
 }
 
 /*
@@ -971,8 +982,8 @@ void *xmmap(void *start, size_t length,
  * With "map" == NULL, try reading the object named with "oid" using
  * the streaming interface and rehash it to do the same.
  */
-int check_object_signature(const struct object_id *oid, void *map,
-			   unsigned long size, const char *type)
+int check_object_signature(struct repository *r, const struct object_id *oid,
+			   void *map, unsigned long size, const char *type)
 {
 	struct object_id real_oid;
 	enum object_type obj_type;
@@ -982,11 +993,11 @@ int check_object_signature(const struct object_id *oid, void *map,
 	int hdrlen;
 
 	if (map) {
-		hash_object_file(map, size, type, &real_oid);
+		hash_object_file(r->hash_algo, map, size, type, &real_oid);
 		return !oideq(oid, &real_oid) ? -1 : 0;
 	}
 
-	st = open_istream(oid, &obj_type, &size, NULL);
+	st = open_istream(r, oid, &obj_type, &size, NULL);
 	if (!st)
 		return -1;
 
@@ -994,8 +1005,8 @@ int check_object_signature(const struct object_id *oid, void *map,
 	hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(obj_type), (uintmax_t)size) + 1;
 
 	/* Sha1.. */
-	the_hash_algo->init_fn(&c);
-	the_hash_algo->update_fn(&c, hdr, hdrlen);
+	r->hash_algo->init_fn(&c);
+	r->hash_algo->update_fn(&c, hdr, hdrlen);
 	for (;;) {
 		char buf[1024 * 16];
 		ssize_t readlen = read_istream(st, buf, sizeof(buf));
@@ -1006,9 +1017,9 @@ int check_object_signature(const struct object_id *oid, void *map,
 		}
 		if (!readlen)
 			break;
-		the_hash_algo->update_fn(&c, buf, readlen);
+		r->hash_algo->update_fn(&c, buf, readlen);
 	}
-	the_hash_algo->final_fn(real_oid.hash, &c);
+	r->hash_algo->final_fn(real_oid.hash, &c);
 	close_istream(st);
 	return !oideq(oid, &real_oid) ? -1 : 0;
 }
@@ -1147,6 +1158,8 @@ static int unpack_loose_short_header(git_zstream *stream,
 				     unsigned char *map, unsigned long mapsize,
 				     void *buffer, unsigned long bufsiz)
 {
+	int ret;
+
 	/* Get the data stream */
 	memset(stream, 0, sizeof(*stream));
 	stream->next_in = map;
@@ -1155,7 +1168,11 @@ static int unpack_loose_short_header(git_zstream *stream,
 	stream->avail_out = bufsiz;
 
 	git_inflate_init(stream);
-	return git_inflate(stream, 0);
+	obj_read_unlock();
+	ret = git_inflate(stream, 0);
+	obj_read_lock();
+
+	return ret;
 }
 
 int unpack_loose_header(git_zstream *stream,
@@ -1200,7 +1217,9 @@ static int unpack_loose_header_to_strbuf(git_zstream *stream, unsigned char *map
 	stream->avail_out = bufsiz;
 
 	do {
+		obj_read_unlock();
 		status = git_inflate(stream, 0);
+		obj_read_lock();
 		strbuf_add(header, buffer, stream->next_out - (unsigned char *)buffer);
 		if (memchr(buffer, '\0', stream->next_out - (unsigned char *)buffer))
 			return 0;
@@ -1240,8 +1259,11 @@ static void *unpack_loose_rest(git_zstream *stream,
 		 */
 		stream->next_out = buf + bytes;
 		stream->avail_out = size - bytes;
-		while (status == Z_OK)
+		while (status == Z_OK) {
+			obj_read_unlock();
 			status = git_inflate(stream, Z_FINISH);
+			obj_read_lock();
+		}
 	}
 	if (status == Z_STREAM_END && !stream->avail_in) {
 		git_inflate_end(stream);
@@ -1343,8 +1365,8 @@ static int loose_object_info(struct repository *r,
 	struct strbuf hdrbuf = STRBUF_INIT;
 	unsigned long size_scratch;
 
-	if (oi->delta_base_sha1)
-		hashclr(oi->delta_base_sha1);
+	if (oi->delta_base_oid)
+		oidclr(oi->delta_base_oid);
 
 	/*
 	 * If we don't care about type or size, then we don't
@@ -1411,10 +1433,32 @@ static int loose_object_info(struct repository *r,
 	return (status < 0) ? status : 0;
 }
 
+int obj_read_use_lock = 0;
+pthread_mutex_t obj_read_mutex;
+
+void enable_obj_read_lock(void)
+{
+	if (obj_read_use_lock)
+		return;
+
+	obj_read_use_lock = 1;
+	init_recursive_mutex(&obj_read_mutex);
+}
+
+void disable_obj_read_lock(void)
+{
+	if (!obj_read_use_lock)
+		return;
+
+	obj_read_use_lock = 0;
+	pthread_mutex_destroy(&obj_read_mutex);
+}
+
 int fetch_if_missing = 1;
 
-int oid_object_info_extended(struct repository *r, const struct object_id *oid,
-			     struct object_info *oi, unsigned flags)
+static int do_oid_object_info_extended(struct repository *r,
+				       const struct object_id *oid,
+				       struct object_info *oi, unsigned flags)
 {
 	static struct object_info blank_oi = OBJECT_INFO_INIT;
 	struct cached_object *co;
@@ -1423,6 +1467,7 @@ int oid_object_info_extended(struct repository *r, const struct object_id *oid,
 	const struct object_id *real = oid;
 	int already_retried = 0;
 
+
 	if (flags & OBJECT_INFO_LOOKUP_REPLACE)
 		real = lookup_replace_object(r, oid);
 
@@ -1440,8 +1485,8 @@ int oid_object_info_extended(struct repository *r, const struct object_id *oid,
 			*(oi->sizep) = co->size;
 		if (oi->disk_sizep)
 			*(oi->disk_sizep) = 0;
-		if (oi->delta_base_sha1)
-			hashclr(oi->delta_base_sha1);
+		if (oi->delta_base_oid)
+			oidclr(oi->delta_base_oid);
 		if (oi->type_name)
 			strbuf_addstr(oi->type_name, type_name(co->type));
 		if (oi->contentp)
@@ -1496,7 +1541,7 @@ int oid_object_info_extended(struct repository *r, const struct object_id *oid,
 	rtype = packed_object_info(r, e.p, e.offset, oi);
 	if (rtype < 0) {
 		mark_bad_packed_object(e.p, real->hash);
-		return oid_object_info_extended(r, real, oi, 0);
+		return do_oid_object_info_extended(r, real, oi, 0);
 	} else if (oi->whence == OI_PACKED) {
 		oi->u.packed.offset = e.offset;
 		oi->u.packed.pack = e.p;
@@ -1507,6 +1552,17 @@ int oid_object_info_extended(struct repository *r, const struct object_id *oid,
 	return 0;
 }
 
+int oid_object_info_extended(struct repository *r, const struct object_id *oid,
+			     struct object_info *oi, unsigned flags)
+{
+	int ret;
+	obj_read_lock();
+	ret = do_oid_object_info_extended(r, oid, oi, flags);
+	obj_read_unlock();
+	return ret;
+}
+
+
 /* returns enum object_type or negative */
 int oid_object_info(struct repository *r,
 		    const struct object_id *oid,
@@ -1543,7 +1599,7 @@ int pretend_object_file(void *buf, unsigned long len, enum object_type type,
 {
 	struct cached_object *co;
 
-	hash_object_file(buf, len, type_name(type), oid);
+	hash_object_file(the_hash_algo, buf, len, type_name(type), oid);
 	if (has_object_file(oid) || find_cached_object(oid))
 		return 0;
 	ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
@@ -1579,6 +1635,7 @@ void *read_object_file_extended(struct repository *r,
 	if (data)
 		return data;
 
+	obj_read_lock();
 	if (errno && errno != ENOENT)
 		die_errno(_("failed to read object %s"), oid_to_hex(oid));
 
@@ -1594,6 +1651,7 @@ void *read_object_file_extended(struct repository *r,
 	if ((p = has_packed_and_bad(r, repl->hash)) != NULL)
 		die(_("packed object %s (stored in %s) is corrupt"),
 		    oid_to_hex(repl), p->pack_name);
+	obj_read_unlock();
 
 	return NULL;
 }
@@ -1647,7 +1705,8 @@ void *read_object_with_reference(struct repository *r,
 	}
 }
 
-static void write_object_file_prepare(const void *buf, unsigned long len,
+static void write_object_file_prepare(const struct git_hash_algo *algo,
+				      const void *buf, unsigned long len,
 				      const char *type, struct object_id *oid,
 				      char *hdr, int *hdrlen)
 {
@@ -1657,10 +1716,10 @@ static void write_object_file_prepare(const void *buf, unsigned long len,
 	*hdrlen = xsnprintf(hdr, *hdrlen, "%s %"PRIuMAX , type, (uintmax_t)len)+1;
 
 	/* Sha1.. */
-	the_hash_algo->init_fn(&c);
-	the_hash_algo->update_fn(&c, hdr, *hdrlen);
-	the_hash_algo->update_fn(&c, buf, len);
-	the_hash_algo->final_fn(oid->hash, &c);
+	algo->init_fn(&c);
+	algo->update_fn(&c, hdr, *hdrlen);
+	algo->update_fn(&c, buf, len);
+	algo->final_fn(oid->hash, &c);
 }
 
 /*
@@ -1713,12 +1772,13 @@ static int write_buffer(int fd, const void *buf, size_t len)
 	return 0;
 }
 
-int hash_object_file(const void *buf, unsigned long len, const char *type,
+int hash_object_file(const struct git_hash_algo *algo, const void *buf,
+		     unsigned long len, const char *type,
 		     struct object_id *oid)
 {
 	char hdr[MAX_HEADER_LEN];
 	int hdrlen = sizeof(hdr);
-	write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
+	write_object_file_prepare(algo, buf, len, type, oid, hdr, &hdrlen);
 	return 0;
 }
 
@@ -1876,7 +1936,8 @@ int write_object_file(const void *buf, unsigned long len, const char *type,
 	/* Normally if we have it in the pack then we do not bother writing
 	 * it out into .git/objects/??/?{38} file.
 	 */
-	write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
+	write_object_file_prepare(the_hash_algo, buf, len, type, oid, hdr,
+				  &hdrlen);
 	if (freshen_packed_object(oid) || freshen_loose_object(oid))
 		return 0;
 	return write_loose_object(oid, hdr, hdrlen, buf, len, 0);
@@ -1892,7 +1953,8 @@ int hash_object_file_literally(const void *buf, unsigned long len,
 	/* type string, SP, %lu of the length plus NUL must fit this */
 	hdrlen = strlen(type) + MAX_HEADER_LEN;
 	header = xmalloc(hdrlen);
-	write_object_file_prepare(buf, len, type, oid, header, &hdrlen);
+	write_object_file_prepare(the_hash_algo, buf, len, type, oid, header,
+				  &hdrlen);
 
 	if (!(flags & HASH_WRITE_OBJECT))
 		goto cleanup;
@@ -2002,7 +2064,8 @@ static int index_mem(struct index_state *istate,
 	if (write_object)
 		ret = write_object_file(buf, size, type_name(type), oid);
 	else
-		ret = hash_object_file(buf, size, type_name(type), oid);
+		ret = hash_object_file(the_hash_algo, buf, size,
+				       type_name(type), oid);
 	if (re_allocated)
 		free(buf);
 	return ret;
@@ -2028,8 +2091,8 @@ static int index_stream_convert_blob(struct index_state *istate,
 		ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
 					oid);
 	else
-		ret = hash_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
-				       oid);
+		ret = hash_object_file(the_hash_algo, sbuf.buf, sbuf.len,
+				       type_name(OBJ_BLOB), oid);
 	strbuf_release(&sbuf);
 	return ret;
 }
@@ -2147,7 +2210,8 @@ int index_path(struct index_state *istate, struct object_id *oid,
 		if (strbuf_readlink(&sb, path, st->st_size))
 			return error_errno("readlink(\"%s\")", path);
 		if (!(flags & HASH_WRITE_OBJECT))
-			hash_object_file(sb.buf, sb.len, blob_type, oid);
+			hash_object_file(the_hash_algo, sb.buf, sb.len,
+					 blob_type, oid);
 		else if (write_object_file(sb.buf, sb.len, blob_type, oid))
 			rc = error(_("%s: failed to insert into database"), path);
 		strbuf_release(&sb);
@@ -2448,8 +2512,9 @@ int read_loose_object(const char *path,
 			git_inflate_end(&stream);
 			goto out;
 		}
-		if (check_object_signature(expected_oid, *contents,
-					 *size, type_name(*type))) {
+		if (check_object_signature(the_repository, expected_oid,
+					   *contents, *size,
+					   type_name(*type))) {
 			error(_("hash mismatch for %s (expected %s)"), path,
 			      oid_to_hex(expected_oid));
 			free(*contents);