diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ba88a26a9c59..ca8d7b2522a7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -4,18 +4,35 @@ stages:
   - perf
   - cleanup
 
+# 1. Git strategy disabled as shown at:
+#    https://docs.gitlab.com/ee/ci/yaml/README.html#git-strategy
+# 2. Git clean flags disabled as shown at:
+#    https://docs.gitlab.com/ee/ci/yaml/README.html#git-clean-flags
 variables:
   GITLAB_MAKE: "make -f .gitlab.mk"
-  GIT_CLEAN_COMMAND: "git clean -ffdx && git submodule foreach git clean -ffdx && git submodule foreach git status"
+  GIT_STRATEGY: none
   GIT_CLEAN_FLAGS: none
 
-.shell_before_script_template: &shell_cleanup_script
+# 1. Git checkout strategy used from:
+#    https://docs.gitlab.com/ee/ci/yaml/README.html#git-checkout
+# 2. Submodule strategy used from:
+#    https://docs.gitlab.com/ee/ci/yaml/README.html#git-submodule-strategy
+# List of steps:
+# 1) Check/clone the Tarantool repository with submodules.
+# 2) For shell based jobs change ownership of all the sources
+#    to gitlab-runner user (NOTE: in Docker based jobs the
+#    gitlab-runner user is not known).
+# 3) Fetch Tarantool sources with branches and force checkout
+#    of the testing commit.
+# 4) Update submodules recursively (use force where supports).
+# 5) Cleanup all the sources from all files except from repository.
+.docker_before_script_template: &job_ws_preparation_script
   before_script:
-    - /bin/bash -c "${GIT_CLEAN_COMMAND}"
-
-.docker_before_script_template: &docker_cleanup_script
-  before_script:
-    - docker run -w /source -v ${PWD}:/source -i packpack/packpack:el-7 /bin/bash -c "${GIT_CLEAN_COMMAND}"
+    - /bin/bash -c "pwd && ls -d .git || git clone --recurse-submodules ${CI_REPOSITORY_URL} ."
+    - /bin/bash -c "! docker -v || (uid=`id -u` ; gid=`id -g` ; docker run -w /source -v ${PWD}:/source -i packpack/packpack:el-7 /bin/bash -c \"chown -R \$uid:\$gid * .[^.]*\")"
+    - /bin/bash -c "git fetch -p && git checkout -f ${CI_COMMIT_SHORT_SHA}"
+    - /bin/bash -c "git submodule sync --recursive && git submodule update --force --init --recursive || git submodule update --recursive --init"
+    - /bin/bash -c "git clean -ffdx && git submodule foreach git clean -ffdx && git submodule foreach git status"
 
 # Jobs templates
 
@@ -46,21 +63,21 @@ variables:
   stage: test
   tags:
     - docker_test
-  <<: *shell_cleanup_script
+  <<: *job_ws_preparation_script
 
 .docker_test_clang8_template: &docker_test_clang8_definition
   image: "${CI_REGISTRY}/${CI_PROJECT_PATH}/testing/debian-buster:latest"
   stage: test
   tags:
     - docker_test
-  <<: *shell_cleanup_script
+  <<: *job_ws_preparation_script
 
 .pack_template: &pack_definition
   <<: *pack_only_definition
   stage: test
   tags:
     - deploy
-  <<: *docker_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} package
 
@@ -69,7 +86,7 @@ variables:
   stage: test
   tags:
     - deploy_test
-  <<: *docker_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} package
 
@@ -78,7 +95,7 @@ variables:
   stage: test
   tags:
     - deploy
-  <<: *docker_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} deploy
 
@@ -87,13 +104,13 @@ variables:
   stage: test
   tags:
     - deploy_test
-  <<: *docker_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} deploy
 
 .osx_template: &osx_definition
   stage: test
-  <<: *shell_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} test_osx
 
@@ -114,14 +131,14 @@ variables:
     paths:
       - "*_result.txt"
       - "*_t_version.txt"
-  <<: *shell_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} perf_run
 
 .perf_cleanup_definition: &perf_cleanup_definition
   <<: *perf_only_definition
   stage: cleanup
-  <<: *shell_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} perf_cleanup
 
@@ -216,7 +233,7 @@ perf_bootstrap:
   stage: test
   tags:
     - deploy
-  <<: *shell_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} perf_prepare
   after_script:
@@ -534,6 +551,6 @@ static_docker_build:
   stage: test
   tags:
     - deploy_test
-  <<: *docker_cleanup_script
+  <<: *job_ws_preparation_script
   script:
     - ${GITLAB_MAKE} test_static_docker_build