use cargo install

.travis.yml

@@ -10,7 +10,8 @@ before_install:
 - MAX_LINE_LENGTH=100 bash ci/check_line_lengths.sh src/**/*.md
 install:
 - source ~/.cargo/env || true
-- bash -x ci/install.sh
+- cargo install mdbook --version 0.3.4
+- cargo install mdbook-linkcheck --version 0.5.0
 script:
 - mdbook build
 notifications:

ci/install.sh

@@ -1,24 +0,0 @@
-#!/bin/bash
-
-set -ex
-
-function cargo_install() {
-  local name=$1
-  local version=$2
-
-  if command -v $name >/dev/null 2>&1; then
-    local installed_version=`$name --version | sed -E 's/[a-zA-Z_-]+ v?//g'`
-    if [ "$installed_version" == "$version" ]; then
-        echo "$name $version is already installed at $(command -v $name)"
-    else
-        echo "Forcing install $name $version"
-        cargo install $name --version $version --force
-    fi
-  else
-    echo "Installing $name $version"
-    cargo install $name --version $version
-  fi
-}
-
-cargo_install mdbook 0.3.4
-cargo_install mdbook-linkcheck 0.5.0