From a3b69c0d5c80062acf19a8858da2032d7b1b85b3 Mon Sep 17 00:00:00 2001
From: Daiderd Jordan <daiderd@gmail.com>
Date: Sat, 3 Jun 2017 20:45:51 +0200
Subject: [PATCH] fetchgit: add postFetch argument

---
 pkgs/build-support/fetchgit/builder.sh  | 1 +
 pkgs/build-support/fetchgit/default.nix | 5 ++++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/pkgs/build-support/fetchgit/builder.sh b/pkgs/build-support/fetchgit/builder.sh
index 4bbef1d6e62..6ae46469738 100644
--- a/pkgs/build-support/fetchgit/builder.sh
+++ b/pkgs/build-support/fetchgit/builder.sh
@@ -12,4 +12,5 @@ $SHELL $fetcher --builder --url "$url" --out "$out" --rev "$rev" \
   ${fetchSubmodules:+--fetch-submodules} \
   ${branchName:+--branch-name "$branchName"}
 
+runHook postFetch
 stopNest
diff --git a/pkgs/build-support/fetchgit/default.nix b/pkgs/build-support/fetchgit/default.nix
index d85d2c893c5..a5f81ef1794 100644
--- a/pkgs/build-support/fetchgit/default.nix
+++ b/pkgs/build-support/fetchgit/default.nix
@@ -15,6 +15,9 @@ in
 , fetchSubmodules ? true, deepClone ? false
 , branchName ? null
 , name ? urlToName url rev
+, # Shell code executed after the file has been fetched
+  # successfully. This can do things like check or transform the file.
+  postFetch ? ""
 }:
 
 /* NOTE:
@@ -54,7 +57,7 @@ stdenv.mkDerivation {
   outputHashMode = "recursive";
   outputHash = sha256;
 
-  inherit url rev leaveDotGit fetchSubmodules deepClone branchName;
+  inherit url rev leaveDotGit fetchSubmodules deepClone branchName postFetch;
 
   GIT_SSL_CAINFO = "${cacert}/etc/ssl/certs/ca-bundle.crt";