travis-ci only unshallow git for installer builds (#3633)

.travis.yml

@@ -2,9 +2,6 @@
 
 language: cpp
 
-git:
-  depth: 1000
-
 env:
   global:
     - SHADOW_BUILD_DIR=/tmp/shadow_build_dir
@@ -79,9 +76,12 @@ cache:
 
 
 before_install:
-  - if [[ "${TRAVIS_PULL_REQUEST}" = "false" && "${CONFIG}" = "debug" ]]; then exit 0; fi
-  - cd ${TRAVIS_BUILD_DIR} && git fetch --unshallow
-  - git fetch --all --tags
+  - if [ "${CONFIG}" = "installer" ]; then
+        cd ${TRAVIS_BUILD_DIR} &&
+        git fetch --unshallow &&
+        git fetch --all --tags
+        ;
+    fi
   - if [ "${TRAVIS_OS_NAME}" = "linux" ]; then
         mkdir -p ~/.config/QtProject/ &&
         cp ${TRAVIS_BUILD_DIR}/test/qtlogging.ini ~/.config/QtProject/
@@ -271,4 +271,3 @@ notifications:
     on_success: change  # options: [always|never|change] default: always
     on_failure: always  # options: [always|never|change] default: always
     on_start: never     # options: [always|never|change] default: always
-