git-cinnabar: 0.5.4 -> 0.5.6

Also add missing installPhase hooks, and clarify license.
I'm assuming GPL-2.0-only, because it doesn't seem to be specified, and
the helper links with git, which is -only.

pkgs/applications/version-management/git-and-tools/git-cinnabar/default.nix

@@ -8,13 +8,13 @@ in
 
 stdenv.mkDerivation rec {
   pname = "git-cinnabar";
-  version = "0.5.4";
+  version = "0.5.6";
 
   src = fetchFromGitHub {
     owner = "glandium";
     repo = "git-cinnabar";
     rev = version;
-    sha256 = "1cjn2cc6mj4m736wxab9s6qx83p5n5ha8cr3x84s9ra6rxs8d7pi";
+    sha256 = "1wbp4xqpkaqhhkjw8rbbsagwiciqffacqqbm4j49q41mlk371ai3";
     fetchSubmodules = true;
   };
 
@@ -27,6 +27,8 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   installPhase = ''
+    runHook preInstall
+
     mkdir -p $out/bin $out/libexec
     install git-cinnabar-helper $out/bin
     install git-cinnabar git-remote-hg $out/libexec
@@ -38,12 +40,14 @@ stdenv.mkDerivation rec {
             --prefix GIT_CINNABAR_EXPERIMENTS , python3 \
             --set PYTHONPATH ${mercurial}/${python3.sitePackages}
     done
+
+    runHook postInstall
   '';
 
   meta = with lib; {
     homepage = "https://github.com/glandium/git-cinnabar";
     description = "git remote helper to interact with mercurial repositories";
-    license = licenses.gpl2;
+    license = licenses.gpl2Only;
     maintainers = with maintainers; [ qyliss ];
     platforms = platforms.all;
   };