Move Titan to separate repository (#293)

* move Titan to separate repository
Signed-off-by: Yi Wu <yiwu@pingcap.com>

.gitmodules

@@ -2,3 +2,6 @@
 	path = librocksdb_sys/rocksdb
 	url = https://github.com/pingcap/rocksdb.git
 	branch = tikv-3.0
+[submodule "titan"]
+	path = librocksdb_sys/libtitan_sys/titan
+	url = https://github.com/pingcap/titan.git

librocksdb_sys/Cargo.toml

@@ -7,6 +7,7 @@ links = "rocksdb"
 
 [dependencies]
 libc = "0.2.11"
+libtitan_sys = { path = "libtitan_sys" }
 
 [dev-dependencies]
 tempdir = "0.3"

librocksdb_sys/build.rs

@@ -117,8 +117,11 @@ fn build_rocksdb() -> Build {
     let cur_dir = env::current_dir().unwrap();
     build.include(cur_dir.join("rocksdb").join("include"));
     build.include(cur_dir.join("rocksdb"));
+    build.include(cur_dir.join("libtitan_sys").join("titan").join("include"));
+    build.include(cur_dir.join("libtitan_sys").join("titan"));
 
     println!("cargo:rustc-link-lib=static=rocksdb");
+    println!("cargo:rustc-link-lib=static=titan");
     println!("cargo:rustc-link-lib=static=z");
     println!("cargo:rustc-link-lib=static=bz2");
     println!("cargo:rustc-link-lib=static=lz4");

librocksdb_sys/crocksdb/c.cc

@@ -45,9 +45,9 @@
 #include "util/file_reader_writer.h"
 #include "util/coding.h"
 
-#include "rocksdb/utilities/titandb/db.h"
-#include "utilities/titandb/blob_format.h"
-#include "utilities/titandb/options.h"
+#include "titan/db.h"
+#include "titan/options.h"
+#include "src/blob_format.h"
 
 #include <stdlib.h>
 

librocksdb_sys/libtitan_sys/Cargo.toml

+[package]
+name = "libtitan_sys"
+version = "0.0.1"
+build = "build.rs"
+links = "titan"
+
+[dependencies]
+libc = "0.2.11"
+
+[build-dependencies]
+cc = "1.0.3"
+cmake = "0.1"
+
+[dependencies.libz-sys]
+version = "1.0.25"
+features = ["static"]
+
+[dependencies.bzip2-sys]
+git = "https://github.com/alexcrichton/bzip2-rs.git"
+
+[dependencies.lz4-sys]
+git = "https://github.com/busyjay/lz4-rs.git"
+branch = "adjust-build"
+
+[dependencies.zstd-sys]
+git = "https://github.com/gyscos/zstd-rs.git"
+
+[dependencies.snappy-sys]
+git = "https://github.com/busyjay/rust-snappy.git"
+branch = "static-link"

librocksdb_sys/libtitan_sys/build.rs

+extern crate cc;
+extern crate cmake;
+
+fn main() {
+    let cur_dir = std::env::current_dir().unwrap();
+    let dst = cmake::Config::new("titan")
+        .define("ROCKSDB_DIR", cur_dir.join("..").join("rocksdb"))
+        .define("WITH_TITAN_TESTS", "OFF")
+        .define("WITH_TITAN_TOOLS", "OFF")
+        .register_dep("Z")
+        .define("WITH_ZLIB", "ON")
+        .register_dep("BZIP2")
+        .define("WITH_BZ2", "ON")
+        .register_dep("LZ4")
+        .define("WITH_LZ4", "ON")
+        .register_dep("ZSTD")
+        .define("WITH_ZSTD", "ON")
+        .register_dep("SNAPPY")
+        .define("WITH_SNAPPY", "ON")
+        .build_target("titan")
+        .build();
+    println!("cargo:rustc-link-search=native={}/build", dst.display());
+    println!("cargo:rustc-link-lib=static=titan");
+}

librocksdb_sys/libtitan_sys/src/lib.rs

+// This file is intented to be empty. It is a placeholder to avoid cargo complain about missing
+// lib.rs.

titan @ c673677c

+Subproject commit c673677c138e2f652b5da332598300762588e4ab

rocksdb @ 87fdda84

-Subproject commit 018aa197230e3deade808fe69dc980772feab449
+Subproject commit 87fdda84d6f4d3568df427d1148d5449328b6e8d