Stage 6 click-testing fixes and production setup

- file_attachment.rb: delete old upload directory before writing replacement
  files; fixes orphaned variants when filename or mime type changes
- assets/edit.html.erb: add file upload field and current file display;
  the form was previously empty and non-functional
- admin.css: fix button_to hover styling; buttons now show orange hover
  to signal interactivity
- test/controllers/users_controller_test.rb: assert input[type=submit]
  not anchor tag for destroy action (button_to change)
- test/test_helper.rb: add I18n.locale reset in setup block
- doc/rc.d_cccms: fix cccms_chdir, add start_precmd for log/pid dirs,
  PATH export for bash wrapper, user/pid/tcp_nopush unicorn fixes
- doc/INSTALL.md: new installation guide covering all non-obvious steps
- Remove parked search migration from doc/ (now in db/migrate/)

2 files changed, 18 insertions, 3 deletions

diff --git a/app/models/concerns/file_attachment.rb b/app/models/concerns/file_attachment.rb
index 5483de5..e9acda6 100644
--- a/app/models/concerns/file_attachment.rb
+++ b/app/models/concerns/file_attachment.rb
@@ -60,6 +60,9 @@ module FileAttachment
     uploaded_file = @pending_upload
     @pending_upload = nil
 
+    old_dir = Rails.root.join("public", "system", "uploads", id.to_s)
+    FileUtils.rm_rf(old_dir) if Dir.exist?(old_dir)
+
     original_path = file_path(:original)
     FileUtils.mkdir_p(File.dirname(original_path))
     FileUtils.cp(uploaded_file.tempfile.path, original_path)
diff --git a/app/views/assets/edit.html.erb b/app/views/assets/edit.html.erb
index e65d600..f198600 100644
--- a/app/views/assets/edit.html.erb
+++ b/app/views/assets/edit.html.erb
@@ -1,12 +1,24 @@
 <h1>Editing asset</h1>
 
-<%= form_for(@asset) do |f| %>
+<%= form_for(@asset, html: { multipart: true }) do |f| %>
   <%= form_error_messages(f) %>
 
+  <% if @asset.upload.present? %>
+    <p>
+      <strong>Current file:</strong>
+      <%= @asset.upload.url %>
+      (<%= number_to_human_size(@asset.upload.size) %>)
+    </p>
+  <% end %>
+
+  <p>
+    <label>Replace file:</label><br>
+    <%= f.file_field :upload %>
+  </p>
+
   <p>
     <%= f.submit 'Update' %>
   </p>
 <% end %>
 
-<%= link_to 'Show', @asset %> |
-<%= link_to 'Back', assets_path %>
+<%= link_to 'Show', @asset %> | <%= link_to 'Back', assets_path %>