Introduce predictable environment slugs64295-predictable-environment-slugs

If an environment slug is predictable given only the environment
name, we can use the environment slug earlier in the CI variable
evaluation process as we don't have to wait for the environment
record itself to be persisted.

1 files changed, 38 insertions, 0 deletions

diff --git a/spec/lib/gitlab/slug/environment_spec.rb b/spec/lib/gitlab/slug/environment_spec.rb
new file mode 100644
index 00000000000..7dc583a94b8
--- /dev/null
+++ b/spec/lib/gitlab/slug/environment_spec.rb
@@ -0,0 +1,38 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Slug::Environment do
+  describe '#generate' do
+    {
+      "staging-12345678901234567" => "staging-123456789-q517sa",
+      "9-staging-123456789012345" => "env-9-staging-123-q517sa",
+      "staging-1234567890123456"  => "staging-1234567890123456",
+      "staging-1234567890123456-" => "staging-123456789-q517sa",
+      "production"                => "production",
+      "PRODUCTION"                => "production-q517sa",
+      "review/1-foo"              => "review-1-foo-q517sa",
+      "1-foo"                     => "env-1-foo-q517sa",
+      "1/foo"                     => "env-1-foo-q517sa",
+      "foo-"                      => "foo",
+      "foo--bar"                  => "foo-bar-q517sa",
+      "foo**bar"                  => "foo-bar-q517sa",
+      "*-foo"                     => "env-foo-q517sa",
+      "staging-12345678-"         => "staging-12345678",
+      "staging-12345678-01234567" => "staging-12345678-q517sa",
+      ""                          => "env-q517sa",
+      nil                         => "env-q517sa"
+    }.each do |name, matcher|
+      before do
+        # ('a' * 64).to_i(16).to_s(36).last(6) gives 'q517sa'
+        allow(Digest::SHA2).to receive(:hexdigest).with(name).and_return('a' * 64)
+      end
+
+      it "returns a slug matching #{matcher}, given #{name}" do
+        slug = described_class.new(name).generate
+
+        expect(slug).to match(/\A#{matcher}\z/)
+      end
+    end
+  end
+end