"command not found" during checking CI cache

Summary

Since I upgraded to GitLab 8.13, CI builds have been failing to check CI caches.

Steps to reproduce

Run a build on GitLab 8.13.0-ee.

Expected behavior

Getting CI cache successfully.

Actual behavior

Failing because it executes a part of querystring as a command.

Relevant logs and/or screenshots

I blinded something can be sensitive:

if "/usr/bin/gitlab-runner-helper" cache-extractor --file ../../../cache/sub/xxxxxx/test/develop/cache.zip --url https://s3-ap-northeast-1.amazonaws.com/ci-cache.xxxxxx/runner/xxxxxxxx/project/1/test/develop?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxxxxxxxxxxxxxxxxx%2F20161024%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Date=20161024T043409Z&X-Amz-Expires=1800&X-Amz-SignedHeaders=host&X-Amz-Signature=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx >/dev/null 2>/dev/null; then
  echo $'\''\x1b[32;1mSuccessfully extracted cache\x1b[0;m'\''
else
  echo $'\''\x1b[0;1mFailed to extract cache\x1b[0;m'\''
fi

Checking cache for test/develop...
++ ++ X-Amz-Credential=xxxxxxxxxxxxxxxxxxxx%2F20161024%2Fap-northeast-1%2Fs3%2Faws4_request
++ X-Amz-Signature=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
/bin/bash: line 73: X-Amz-Credential=xxxxxxxxxxxxxxxxxxxx%2F20161024%2Fap-northeast-1%2Fs3%2Faws4_request: command not found
/usr/bin/gitlab-runner-helper cache-extractor --file ../../../cache/sub/xxxxxx/test/develop/cache.zip --url 'https://s3-ap-northeast-1.amazonaws.com/ci-cache.xxxxxx/runner/xxxxxxxx/project/1/test/develop?X-Amz-Algorithm=AWS4-HMAC-SHA256'
++ ++ ++ X-Amz-Date=20161024T043409ZX-Amz-Expires=1800

X-Amz-Credential=xxxxxxxxxxxxxxxxxxxx%2F20161024%2Fap-northeast-1%2Fs3%2Faws4_request is a part of querystring to get CI cache from S3. But GitLab CI treats it as a command.

Output of checks

Results of GitLab application Check

Too long to paste but all passed.

Results of GitLab environment info

I blinded the URL:

System information
System:         Ubuntu 14.04
Current User:   git
Using RVM:      no
Ruby Version:   2.3.1p112
Gem Version:    2.6.6
Bundler Version:1.13.5
Rake Version:   10.5.0
Sidekiq Version:4.2.1

GitLab information
Version:        8.13.0-ee
Revision:       562bbc6
Directory:      /opt/gitlab/embedded/service/gitlab-rails
DB Adapter:     PostgreSQL
DB Version:     9.2.18
URL:            http://xxx
HTTP Clone URL: http://xxx/some-group/some-project.git
SSH Clone URL:  git@xxx:some-group/some-project.git
Elasticsearch:  no
Geo:            no
Using LDAP:     no
Using Omniauth: no

GitLab Shell
Version:        3.6.6
Repository storage paths:
- default:      /var/opt/gitlab/git-data/repositories
Hooks:          /opt/gitlab/embedded/service/gitlab-shell/hooks/
Git:            /opt/gitlab/embedded/bin/git