diff --git a/README.md b/README.md
index fd7d176..0a3a8d5 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,42 @@ redmine_repository_fetch
 ========================
 
 Redmine plugin to automatically clone and fetch referenced repositories
+
+Currently the plugin hardcodes this config, change it for your use-case:
+
+```
+   PATTERNS = [ 
+     {  :pattern => "/redmine_git_fetch/github.com/",
+        :uri_prefix => "git@github.com:",
+        :key => "/home/redmine/data/keys/id_rsa"
+     },
+     {  :pattern => "/redmine_git_fetch/gitlab.com/",
+        :uri_prefix => "git@gitlab.com:",
+        :key => "/home/redmine/data/keys/id_rsa"
+     },
+     {  :pattern => "/redmine_git_fetch/git.ewdev.ca/",
+        :uri_prefix => "git@git.ewdev.ca:",
+        :key => "/home/redmine/data/keys/id_rsa"
+     }
+   ]
+```
+
+Once you have it setup, do the following:
+
+Add `/redmine_git_fetch/github.com/evolvingweb/sitediff.git` to a repo.  The
+plugin will automatically detect the prefix `/redmine_git_fetch/github.com/`
+and figure out it needs to clone `git@github.com:evolvingweb/sitediff.git`.
+If it's already cloned it will fetch instead. In all cases you need to specify
+a path to a private key to use, since all clones happen over SSH.
+
+Note that `/redmine_git_fetch` folder will get auto-created.
+
+The plugin currently doesn't fetch any repos outside its purview.
+
+It also needs to be run as follows:
+
+```
+bundle exec rails runner "RepositoryFetch.fetch" -e production
+```
+
+Tested on Redmine 2.6.
diff --git a/init.rb b/init.rb
new file mode 100644
index 0000000..280c44b
--- /dev/null
+++ b/init.rb
@@ -0,0 +1,10 @@
+require 'redmine'
+require_dependency "repository_fetch/fetch"
+
+Redmine::Plugin.register :repository_fetch do
+  name 'Repository Fetch'
+  author 'Alex Dergachev'
+  url 'https://github.com/dergachev/redmine_repository_fetch'
+  description 'Automatically clone and fetch referenced repositories'
+  version '0.0.1'
+end
diff --git a/lib/repository_fetch/fetch.rb b/lib/repository_fetch/fetch.rb
new file mode 100644
index 0000000..31691d3
--- /dev/null
+++ b/lib/repository_fetch/fetch.rb
@@ -0,0 +1,62 @@
+module RepositoryFetch
+
+  def self.logger
+    ::Rails.logger
+  end
+
+   PATTERNS = [ 
+     {  :pattern => "/redmine_git_fetch/github.com/",
+        :uri_prefix => "git@github.com:",
+        :key => "/home/redmine/data/keys/id_rsa"
+     },
+     {  :pattern => "/redmine_git_fetch/gitlab.com/",
+        :uri_prefix => "git@gitlab.com:",
+        :key => "/home/redmine/data/keys/id_rsa"
+     },
+     {  :pattern => "/redmine_git_fetch/git.ewdev.ca/",
+        :uri_prefix => "git@git.ewdev.ca:",
+        :key => "/home/redmine/data/keys/id_rsa"
+     }
+   ]
+
+  def self.clone_or_fetch(repository)
+    return unless repository.scm_name == "Git"
+
+    path = repository.url
+
+    p = PATTERNS.find { |p| path.starts_with? p[:pattern] }
+    unless p
+      # TODO: figure out how to handle non-matching repos.
+      # eg. skip them, try fetching them, throw warning or not?
+      proj = repository.project.identifier
+      logger.warn "repository_fetch: no match for '#{path}' in project '#{proj}'"
+      return
+    end
+
+    # If dir exists and non-empty, should be safe to 'git fetch'
+    if Dir.exists?(path) && Dir.entries(path) != [".", ".."]
+      puts "Running git fetch on #{path}"
+      puts self.exec_with_key "git -C #{path} fetch --all", p[:key]
+    else
+      # try cloning the repo
+      url = path.sub( p[:pattern], p[:uri_prefix])
+      puts "Matched new URL, trying to clone: " + url
+      puts self.exec_with_key "git clone --mirror #{url} #{path}", p[:key]
+    end
+  end
+
+  def self.exec_with_key(cmd, keyfile)
+    return `ssh-agent bash -c 'ssh-add #{keyfile}; #{cmd}'`
+  end
+
+  def self.fetch
+    Project.active.has_module(:repository).all.each do |project|
+      project.repositories.each do |repository|
+        self.clone_or_fetch(repository)
+      end
+    end
+  end
+
+  class Fetcher
+  end
+end