1 files changed, 10 insertions, 0 deletions
diff --git a/pkgs/build-support/fetchgitrevision/default.nix b/pkgs/build-support/fetchgitrevision/default.nix
new file mode 100644
index 000000000000..d1e96f4bee5b
--- /dev/null
+++ b/pkgs/build-support/fetchgitrevision/default.nix
@@ -0,0 +1,10 @@
+runCommand: git: repository: branch:
+  import (runCommand "head-revision"
+    { buildInputs = [ git ];
+      dummy = builtins.currentTime;
+    }
+    ''
+      rev=$(git ls-remote ${repository} | grep "refs/${branch}$" | awk '{ print $1 }')
+      echo "[ \"$rev\" ]" > $out
+      echo Latest revision in ${branch} is $rev
+    '');