diff --git a/shard.lock.1 b/shard.lock.1
new file mode 100644
index 0000000..44b13c7
--- /dev/null
+++ b/shard.lock.1
@@ -0,0 +1,46 @@
+version: 2.0
+shards:
+  carbon:
+    git: https://github.com/luckyframework/carbon.git
+    version: 0.2.1
+
+  carbon_smtp_adapter:
+    hg: https://hg.sr.ht/~peterhoeg/dummy
+    version: 0.1.1+hg.commit.4048cd7e156f3d4317e10ebd4e742020c8049310
+
+  email:
+    git: https://github.com/arcage/crystal-email.git
+    version: 0.6.4
+
+  habitat:
+    git: https://github.com/luckyframework/habitat.git
+    version: 0.4.8
+
+  libremiliacr:
+    fossil: https://chiselapp.com/user/MistressRemilia/repository/libremiliacr
+    version: 0.90.6
+
+  lucky_task:
+    git: https://github.com/luckyframework/lucky_task.git
+    version: 0.1.1
+
+  teeplate:
+    git: https://github.com/luckyframework/teeplate.git
+    version: 0.8.5
+
+  version_from_shard:
+    git: https://github.com/hugopl/version_from_shard.git
+    version: 1.2.5
+
+  wordsmith:
+    git: https://github.com/luckyframework/wordsmith.git
+    version: 0.3.0
+
+  yunosynth:
+    fossil: https://chiselapp.com/user/MistressRemilia/repository/yunosynth
+    version: 0.4.2+fossil.commit.e820a8489011d22d43383526726b40695238c79d8e8b335fbf60a42dd0215544
+
+  zstd:
+    git: https://github.com/didactic-drunk/zstd.cr.git
+    version: 1.2.0
+
diff --git a/shard.yml b/shard.yml
index db1c628..0349094 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,4 +1,3 @@
----
 name: crystal2nix
 version: 0.3.0
 license: MIT
@@ -18,12 +17,11 @@ dependencies:
     github: hugopl/version_from_shard
     version: ~> 1.2.4
 
+  carbon_smtp_adapter:
+    hg: https://hg.sr.ht/~peterhoeg/dummy
+    version: ~> 0.1.1
+
 development_dependencies:
   spectator:
     gitlab: arctic-fox/spectator
     version: ~> 0.10.5
-
-dependencies:
-  carbon_smtp_adapter:
-    hg: https://hg.sr.ht/~peterhoeg/dummy
-    version: ~> 0.1.1
\ No newline at end of file
diff --git a/shards.nix b/shards.nix
index 88f502d..e69de29 100644
--- a/shards.nix
+++ b/shards.nix
@@ -1,21 +0,0 @@
-{
-  spectator = {
-    url = "https://gitlab.com/arctic-fox/spectator.git";
-    rev = "v0.10.5";
-    sha256 = "1fgjz5vg59h4m25v4fjklimcdn62ngqbchm00kw1160ggjpgpzw2";
-  };
-  version_from_shard = {
-    url = "https://github.com/hugopl/version_from_shard.git";
-    rev = "v1.2.5";
-    sha256 = "0xizj0q4rd541rwjbx04cjifc2gfx4l5v6q2y7gmd0ndjmkgb8ik";
-  };
-  carbon_smtp_adapter = {
-    hg = "https://hg.sr.ht/~peterhoeg/dummy";
-    rev = "v0.1.1";
-    sha256 = "0kdb0k1xzl4yysfmlif7xmr2mnb3y5f3knqr8dy08f3sq9n31x4z";
-
-  }
-}
-
-    
-   
\ No newline at end of file
diff --git a/spec/repo_spec.cr b/spec/repo_spec.cr
index c889e98..31a355d 100644
--- a/spec/repo_spec.cr
+++ b/spec/repo_spec.cr
@@ -1,6 +1,6 @@
 require "./spec_helper"
 
-Spectator.describe Crystal2Nix::Repo do
+Spectator.describe Repo do
   context "commit" do
     let(:with_commit) {
       <<-EOF
@@ -9,12 +9,8 @@ Spectator.describe Crystal2Nix::Repo do
       EOF
     }
 
-    let(:shard) {
-      Crystal2Nix::Shard.from_yaml(with_commit)
-    }
-
     let(:repo) {
-      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
+      Crystal2Nix::Repo.new(Crystal2Nix::Shard.from_yaml(with_commit))
     }
 
     it "should have the commit as revision" do
@@ -30,56 +26,12 @@ Spectator.describe Crystal2Nix::Repo do
       EOF
     }
 
-    let(:shard) {
-      Crystal2Nix::Shard.from_yaml(with_version)
-    }
-
     let(:repo) {
-      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
+      Crystal2Nix::Repo.new(Crystal2Nix::Shard.from_yaml(with_version))
     }
 
     it "should prefix version references with a v" do
       expect(repo.rev).to eq("v0.1.1")
     end
   end
-
-  context "http url" do
-    let(:with_http_url) {
-      <<-EOF
-      http: https://example.com/archive.tar.gz
-      EOF
-    }
-
-    let(:shard) {
-      Crystal2Nix::Shard.from_yaml(with_http_url)
-    }
-
-    let(:repo) {
-      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
-    }
-
-    it "should have the correct url" do
-      expect(repo.url).to eq("https://example.com/archive.tar.gz")
-    end
-  end
-
-  context "git without revision" do
-    let(:without_revision) {
-      <<-EOF
-      git: https://github.com/example/repo.git
-      EOF
-    }
-
-    let(:shard) {
-      Crystal2Nix::Shard.from_yaml(without_revision)
-    }
-
-    let(:repo) {
-      Crystal2Nix::Repo.new(shard.url, shard.rev, shard.type)
-    }
-
-    it "should have the correct url" do
-      expect(repo.url).to eq("https://github.com/example/repo.git")
-    end
-  end
-end
+end
\ No newline at end of file
diff --git a/src/worker.cr b/src/worker.cr
index 3842f04..a12ade3 100644
--- a/src/worker.cr
+++ b/src/worker.cr
@@ -1,6 +1,34 @@
+require "json"
+require "yaml"
+
 module Crystal2Nix
   SHARDS_NIX = "shards.nix"
 
+  class PrefetchJSON
+    JSON.mapping({
+      sha256: String
+    })
+  end
+
+  class Repo
+    getter url, rev
+
+    def initialize(shard_info)
+      @url = shard_info["github"]? || shard_info["gitlab"]? || shard_info["url"]?
+      @rev = shard_info["version"]? || "master"
+    end
+  end
+
+  class ShardLock
+    JSON.mapping({
+      shards: Hash(String, Hash(String, String))
+    })
+
+    def self.from_yaml(yaml_str : String)
+      from_json YAML.parse(yaml_str).to_json
+    end
+  end
+
   class Worker
     def initialize(@lock_file : String)
     end
@@ -14,35 +42,36 @@ module Crystal2Nix
             STDERR.puts "Unable to parse repository entry"
             exit 1
           end
+
           sha256 = ""
-          case 
+
+          case
           when repo.url.ends_with?(".git")
-          
-          args = [
-            "--no-deepClone",
-            "--url", repo.url,
-            "--rev", repo.rev,
-          ]
-          Process.run("nix-prefetch-git", args: args) do |x|
-            x.error.each_line { |e| puts e }
-            sha256 = PrefetchJSON.from_json(x.output).sha256
-          end
-        when repo.url.starts_with?("hg://") || repo.url.ends_with?(".hg")
-          args = [
-            "--url", repo.url,
-            "--rev", repo.rev,
-          ]
-          Process.run("nix-prefetch-hg", args: args) do |x|
-            x.error.each_line { |e| puts e }
-            sha256 = PrefetchJSON.from_json(x.output).sha256
+            args = [
+              "--no-deepClone",
+              "--url", repo.url,
+              "--rev", repo.rev,
+            ]
+            Process.run("nix-prefetch-git", args: args) do |x|
+              x.error.each_line { |e| STDERR.puts e }
+              sha256 = PrefetchJSON.from_json(x.output).sha256
+            end
+          when repo.url.starts_with?("hg://") || repo.url.ends_with?(".hg")
+            args = [
+              "--url", repo.url,
+              "--rev", repo.rev,
+            ]
+            Process.run("nix-prefetch-hg", args: args) do |x|
+              x.error.each_line { |e| STDERR.puts e }
+              sha256 = PrefetchJSON.from_json(x.output).sha256
+            end
+          when repo.url.ends_with?(".fossil")
+            STDERR.puts "Fossil repositories are not supported."
+            next
+          else
+            STDERR.puts "Unknown repository type for #{repo.url}"
+            next
           end
-        when repo.url.ends_with?(".fossil")
-          STDERR.puts "Fossil repositories are not supported."
-          next
-        else
-          STDERR.puts "Unknown repository type for #{repo.url}"
-          next
-        end
 
           file.puts %(  #{key} = {)
           file.puts %(    url = "#{repo.url}";)
@@ -54,4 +83,4 @@ module Crystal2Nix
       end
     end
   end
-end
\ No newline at end of file
+end