Switch rails 4 to 5 in gitlab-ci

CI jobs will be triggered both with rails 4 and 5
to make sure we keep backward compatibility if it turns out
we have to switch back to rails 4.

Rails 4 jobs are not allowed to fail for now, these jobs will be
removed in a follow-up MR next cycle.

.gitlab-ci.yml

@@ -75,15 +75,15 @@ stages:
     - mysql:5.7
     - redis:alpine
-.rails5: &rails5
-  allow_failure: true
+.rails4: &rails4
+  allow_failure: false
   only:
     variables:
-      - $CI_COMMIT_REF_NAME =~ /rails5/
-      - $RAILS5_ENABLED
+      - $CI_COMMIT_REF_NAME =~ /norails4/
+      - $RAILS5_DISABLED
   variables:
-    BUNDLE_GEMFILE: "Gemfile.rails5"
-    RAILS5: "true"
+    BUNDLE_GEMFILE: "Gemfile.rails4"
+    RAILS5: "false"
 # Skip all jobs except the ones that begin with 'docs/'.
 # Used for commits including ONLY documentation changes.
@@ -177,17 +177,17 @@ stages:
   <<: *rspec-metadata
   <<: *use-pg
-.rspec-metadata-pg-rails5: &rspec-metadata-pg-rails5
+.rspec-metadata-pg-rails4: &rspec-metadata-pg-rails4
   <<: *rspec-metadata-pg
-  <<: *rails5
+  <<: *rails4
 .rspec-metadata-mysql: &rspec-metadata-mysql
   <<: *rspec-metadata
   <<: *use-mysql
-.rspec-metadata-mysql-rails5: &rspec-metadata-mysql-rails5
+.rspec-metadata-mysql-rails4: &rspec-metadata-mysql-rails4
   <<: *rspec-metadata-mysql
-  <<: *rails5
+  <<: *rails4
 .only-canonical-masters: &only-canonical-masters
   only:
@@ -429,7 +429,7 @@ setup-test-env:
   script:
     - bundle exec ruby -Ispec -e 'require "spec_helper" ; TestEnv.init'
     - scripts/gitaly-test-build # Do not use 'bundle exec' here
-    - BUNDLE_GEMFILE=Gemfile.rails5 bundle install $BUNDLE_INSTALL_FLAGS
+    - BUNDLE_GEMFILE=Gemfile.rails4 bundle install $BUNDLE_INSTALL_FLAGS
   artifacts:
     expire_in: 7d
     paths:
@@ -521,67 +521,67 @@ rspec-mysql 27 30: *rspec-metadata-mysql
 rspec-mysql 28 30: *rspec-metadata-mysql
 rspec-mysql 29 30: *rspec-metadata-mysql
-rspec-pg-rails5 0 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 1 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 2 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 3 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 4 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 5 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 6 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 7 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 8 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 9 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 10 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 11 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 12 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 13 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 14 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 15 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 16 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 17 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 18 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 19 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 20 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 21 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 22 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 23 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 24 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 25 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 26 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 27 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 28 30: *rspec-metadata-pg-rails5
-rspec-pg-rails5 29 30: *rspec-metadata-pg-rails5
-
-rspec-mysql-rails5 0 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 1 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 2 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 3 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 4 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 5 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 6 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 7 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 8 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 9 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 10 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 11 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 12 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 13 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 14 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 15 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 16 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 17 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 18 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 19 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 20 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 21 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 22 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 23 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 24 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 25 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 26 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 27 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 28 30: *rspec-metadata-mysql-rails5
-rspec-mysql-rails5 29 30: *rspec-metadata-mysql-rails5
+rspec-pg-rails4 0 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 1 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 2 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 3 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 4 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 5 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 6 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 7 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 8 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 9 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 10 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 11 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 12 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 13 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 14 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 15 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 16 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 17 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 18 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 19 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 20 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 21 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 22 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 23 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 24 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 25 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 26 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 27 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 28 30: *rspec-metadata-pg-rails4
+rspec-pg-rails4 29 30: *rspec-metadata-pg-rails4
+
+rspec-mysql-rails4 0 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 1 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 2 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 3 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 4 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 5 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 6 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 7 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 8 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 9 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 10 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 11 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 12 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 13 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 14 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 15 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 16 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 17 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 18 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 19 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 20 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 21 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 22 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 23 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 24 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 25 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 26 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 27 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 28 30: *rspec-metadata-mysql-rails4
+rspec-mysql-rails4 29 30: *rspec-metadata-mysql-rails4
 static-analysis:
   <<: *dedicated-no-docs-no-db-pull-cache-job
@@ -627,11 +627,11 @@ downtime_check:
     - /(^docs[\/-].*|.*-docs$)/
     - /(^qa[\/-].*|.*-qa$)/
-rails5_gemfile_lock_check:
+rails4_gemfile_lock_check:
   <<: *dedicated-no-docs-no-db-pull-cache-job
   <<: *except-docs-and-qa
   script:
-    - scripts/rails5-gemfile-lock-check
+    - scripts/rails4-gemfile-lock-check
 ee_compat_check:
   <<: *rake-exec

scripts/rails4-gemfile-lock-check

+#!/usr/bin/env bash
+
+echo -e "=> Checking if Gemfile.rails4.lock is up-to-date...\\n"
+
+cp Gemfile.rails4.lock Gemfile.rails4.lock.orig
+BUNDLE_GEMFILE=Gemfile.rails4 bundle install "$BUNDLE_INSTALL_FLAGS"
+diff -u Gemfile.rails4.lock.orig Gemfile.rails4.lock >/dev/null 2>&1
+
+if [ $? == 1 ]
+then
+  diff -u Gemfile.rails4.lock.orig Gemfile.rails4.lock
+
+  echo -e "\\n✖ ERROR: Gemfile.rails4.lock is not up-to-date!
+         Please run 'BUNDLE_GEMFILE=Gemfile.rails4 bundle install'\\n" >&2
+  exit 1
+fi
+
+echo "✔ Gemfile.rails4.lock is up-to-date"
+exit 0

scripts/rails5-gemfile-lock-check

-#!/usr/bin/env bash
-
-echo -e "=> Checking if Gemfile.rails5.lock is up-to-date...\\n"
-
-cp Gemfile.rails5.lock Gemfile.rails5.lock.orig
-BUNDLE_GEMFILE=Gemfile.rails5 bundle install "$BUNDLE_INSTALL_FLAGS"
-diff -u Gemfile.rails5.lock.orig Gemfile.rails5.lock >/dev/null 2>&1
-
-if [ $? == 1 ]
-then
-  diff -u Gemfile.rails5.lock.orig Gemfile.rails5.lock
-
-  echo -e "\\n✖ ERROR: Gemfile.rails5.lock is not up-to-date!
-         Please run 'BUNDLE_GEMFILE=Gemfile.rails5 bundle install'\\n" >&2
-  exit 1
-fi
-
-echo "✔ Gemfile.rails5.lock is up-to-date"
-exit 0