From 6810ad40606263944b0d11d0904d2d0d5f57cb39 Mon Sep 17 00:00:00 2001
From: Lzu Tao <taolzu@gmail.com>
Date: Mon, 21 Oct 2019 21:39:39 +0700
Subject: [PATCH 1/3] build: use minimal rustup profile to avoid rust-docs
 components

---
 .travis.yml | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 0e85c20f..35c0d7d9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,14 +1,13 @@
-language: rust
+language: shell
 
 cache: cargo
 
-rust:
-  - nightly
+before_install:
+  - curl -sSL https://sh.rustup.rs | sh -s -- -y --default-toolchain=nightly --profile=minimal
+  - export PATH="$HOME/.cargo/bin:$PATH"
 
 before_script:
   - (cargo install mdbook --force || true)
 
 script:
-  - export PATH=$PATH:/home/travis/.cargo/bin;
   - mdbook test
-

From 7c1607a50f3805dd813100479fd077509c86c5d2 Mon Sep 17 00:00:00 2001
From: Lzu Tao <taolzu@gmail.com>
Date: Mon, 21 Oct 2019 21:40:11 +0700
Subject: [PATCH 2/3] build: cache .cargo/bin only

---
 .travis.yml | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 35c0d7d9..bfcb8ab4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,15 @@
 language: shell
 
-cache: cargo
+cache:
+  directories:
+    - "$HOME/.cargo/bin"
 
 before_install:
   - curl -sSL https://sh.rustup.rs | sh -s -- -y --default-toolchain=nightly --profile=minimal
   - export PATH="$HOME/.cargo/bin:$PATH"
 
-before_script:
-  - (cargo install mdbook --force || true)
+install:
+  - cargo install -Z install-upgrade mdbook
 
 script:
   - mdbook test

From 4b15126000acf2acfdac7102e87c2cb0592143e1 Mon Sep 17 00:00:00 2001
From: Lzu Tao <taolzu@gmail.com>
Date: Mon, 21 Oct 2019 21:46:29 +0700
Subject: [PATCH 3/3] build: use cargo-cache to clean up .cargo dir

---
 .travis.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.travis.yml b/.travis.yml
index bfcb8ab4..e5007e5f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,7 +2,10 @@ language: shell
 
 cache:
   directories:
-    - "$HOME/.cargo/bin"
+    - "$HOME/.cargo"
+before_cache:
+  - cargo install -Z install-upgrade cargo-cache --debug
+  - cargo cache --autoclean
 
 before_install:
   - curl -sSL https://sh.rustup.rs | sh -s -- -y --default-toolchain=nightly --profile=minimal