store and display public key fingerprint

app/models/key.rb

@@ -15,6 +15,8 @@
 require 'digest/md5'
 class Key < ActiveRecord::Base
+  include Gitlab::Popen
+
   belongs_to :user
   attr_accessible :key, :title
@@ -34,16 +36,10 @@ class Key < ActiveRecord::Base
   def fingerprintable_key
     return true unless key # Don't test if there is no key.
-    file = Tempfile.new('key_file')
-    begin
-      file.puts key
-      file.rewind
-      fingerprint_output = `ssh-keygen -lf #{file.path} 2>&1` # Catch stderr.
-    ensure
-      file.close
-      file.unlink # deletes the temp file
+    unless generate_fingerpint
+      errors.add(:key, "can't be fingerprinted")
+      false
     end
-    errors.add(:key, "can't be fingerprinted") if $?.exitstatus != 0
   end
   # projects that has this key
@@ -54,4 +50,30 @@ class Key < ActiveRecord::Base
   def shell_id
     "key-#{id}"
   end
+
+  private
+
+  def generate_fingerpint
+    cmd_status = 0
+    cmd_output = ''
+    file = Tempfile.new('gitlab_key_file')
+
+    begin
+      file.puts key
+      file.rewind
+      cmd_output, cmd_status = popen("ssh-keygen -lf #{file.path}", '/tmp')
+    ensure
+      file.close
+      file.unlink # deletes the temp file
+    end
+
+    if cmd_status.zero?
+      cmd_output.gsub /([\d\h]{2}:)+[\d\h]{2}/ do |match|
+        self.fingerprint = match
+      end
+      true
+    else
+      false
+    end
+  end
 end

app/views/profiles/keys/_key.html.haml

 %li
   = link_to profile_key_path(key) do
     %strong= key.title
+  %span
+    (#{key.fingerprint})
   %span.cgray
     added
     = time_ago_in_words(key.created_at)
     ago
-  = link_to 'Remove', profile_key_path(key), confirm: 'Are you sure?', method: :delete, class: "btn btn-small btn-remove delete-key pull-right"
+  = link_to 'Remove', profile_key_path(key), confirm: 'Are you sure?', method: :delete, class: "btn btn-small btn-remove delete-key pull-right"

app/views/profiles/keys/show.html.haml

@@ -12,6 +12,9 @@
           %strong= @key.created_at.stamp("Aug 21, 2011")
   .span8
+    %p
+      %span.light Fingerprint:
+      %strong= @key.fingerprint
     %pre.well-pre
       = @key.key

db/migrate/20130624162710_add_fingerprint_to_key.rb

+class AddFingerprintToKey < ActiveRecord::Migration
+  def change
+    add_column :keys, :fingerprint, :string
+    remove_column :keys, :identifier
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
-ActiveRecord::Schema.define(:version => 20130622115340) do
+ActiveRecord::Schema.define(:version => 20130624162710) do
   create_table "deploy_keys_projects", :force => true do |t|
     t.integer  "deploy_key_id", :null => false
@@ -77,11 +77,10 @@ ActiveRecord::Schema.define(:version => 20130622115340) do
     t.datetime "updated_at"
     t.text     "key"
     t.string   "title"
-    t.string   "identifier"
     t.string   "type"
+    t.string   "fingerprint"
   end
-  add_index "keys", ["identifier"], :name => "index_keys_on_identifier"
   add_index "keys", ["user_id"], :name => "index_keys_on_user_id"
   create_table "merge_requests", :force => true do |t|

lib/tasks/migrate/migrate_keys.rake

+desc "GITLAB | Migrate SSH Keys"
+task migrate_keys: :environment do
+  puts "This will add fingerprint to ssh keys in db"
+  ask_to_continue
+
+  Key.find_each(batch_size: 20) do |key|
+    if key.valid? && key.save
+      print '.'
+    else
+      print 'F'
+    end
+  end
+end
+
+