update CI (#642)

Changes:
1. Since travis-ci.org is terminated, we are moving CI of this repo to PingCAP internal jenkins CI. Removing all travis related scripts.
2. remove `./rust-toolchain` file, and `Make build` will download the file from latest TiKV master, so we can keep in sync with TiKV.
3. fixing flaky test_auto_roll_max_size_info_log. In the background rocksdb can trigger log rotation. If log rotates exactly when the test check for LOG file existence, the check can fail. Removing the check.
Signed-off-by: Yi Wu <yiwu@pingcap.com>

.gitignore

 *.swo
 *.swp
-target
-Cargo.lock
 *.orig
 *.bk
 _rust_rocksdb*
@@ -12,3 +10,7 @@ tags
 out/
 *.iml
 .vscode
+
+target
+Cargo.lock
+rust-toolchain

.travis.yml

-dist: bionic
-language: rust
-
-rust:
-  - nightly
-
-addons:
-  apt:
-    sources:
-      - llvm-toolchain-bionic-7
-    packages:
-      - clang-format-7
-
-jobs:
-  include:
-  - os: linux
-    rust: nightly
-    env: FEATURES="encryption,jemalloc,portable,sse"
-  - os: linux
-    arch: arm64-graviton2
-    rust: nightly
-  - os: osx
-    osx_image: xcode11.5
-    rust: nightly
-  - env: TASK="clang-format"
-
-env:
-  global:
-  - RUST_BACKTRACE=1
-
-before_script:
-  - rustup component add rustfmt-preview
-  - rustup component add clippy
-
-script:
-  # compiling rocksdb may cost more than 10 minutes, see https://docs.travis-ci.com/user/common-build-problems/#build-times-out-because-no-output-was-received
-  - if [ "${TASK}" == "clang-format" ]; then
-      bash ./travis-build/travis-format.sh;
-    else
-      travis_wait make clippy;
-      cargo fmt --all -- --check;
-      cargo build --features=$FEATURES;
-      cargo test --all --features=$FEATURES;
-    fi

Makefile

 all: format build test
 
-format:
+prepare:
+	curl https://raw.githubusercontent.com/tikv/tikv/master/rust-toolchain > rust-toolchain
+
+format: prepare
 	@cargo fmt --all
 	@scripts/format-diff.sh
 
-build:
+build: prepare
 	@cargo build
 
-test:
+test: prepare
 	@export RUST_BACKTRACE=1 && cargo test -- --nocapture
 
 clean:
@@ -15,7 +18,7 @@ clean:
 	@cd librocksdb_sys && cargo clean
 
 # TODO it could be worth fixing some of these lints
-clippy:
+clippy: prepare
 	@cargo clippy --all -- \
 	-D warnings \
 	-A clippy::redundant_field_names -A clippy::single_match \

rust-toolchain

-nightly-2021-01-25

tests/cases/test_rocksdb_options.rs

@@ -293,8 +293,6 @@ fn test_auto_roll_max_size_info_log() {
         .unwrap();
 
     let db = DB::open(opts, path.path().to_str().unwrap()).unwrap();
-    assert!(Path::new(info_dir.path().join("LOG").to_str().unwrap()).is_file());
-
     drop(db);
 
     // The LOG must be rolled many times.

travis-build/Makefile

-prepare-rustfmt:
-	@[[ "`cargo fmt -- --version`" = "0.2.1-nightly ( )" ]] || cargo install --vers 0.2.1 --force rustfmt-nightly || exit 0
\ No newline at end of file

travis-build/travis-format.sh

-#!/bin/bash
-
-set -ev
-git fetch --depth=1 origin master:master;
-git diff $(git merge-base master HEAD) HEAD ./librocksdb_sys/crocksdb > diff;
-cat diff | clang-format-diff-7 -style=google -p1 > formatted;
-if [ -s formatted ]; then
-  cat formatted;
-  echo "Run \`scripts/format-diff.sh\` to format your code.";
-  exit 1;
-fi;