Cache Cargo in Travis.

.travis.yml

@@ -1,4 +1,5 @@
 language: rust
+cache: cargo
 rust:
   - nightly
 script: ./scripts/test.sh

examples/todo/bootstrap.sh

@@ -3,10 +3,12 @@
 SCRIPT_PATH=$(cd "$(dirname "$0")" ; pwd -P)
 DATABASE_URL=${SCRIPT_PATH}/db/db.sql
 
-pushd $SCRIPT_PATH
-  # install the diesel CLI tools
-  cargo install diesel_cli
+pushd $SCRIPT_PATH > /dev/null
+  # install the diesel CLI tools if they're not installed
+  if ! command -v diesel >/dev/null 2>&1; then
+    cargo install diesel_cli
+  fi
 
   # create db/db.sql
   diesel migration --database-url=$DATABASE_URL run
-popd $SCRIPT_PATH
+popd $SCRIPT_PATH > /dev/null

scripts/test.sh

@@ -46,6 +46,9 @@ function check_versions_match() {
   done
 }
 
+# Update dependencies first.
+cargo update
+
 build_and_test "${LIB_DIR}"
 build_and_test "${CODEGEN_DIR}"
 build_and_test "${CONTRIB_DIR}"