pre-push v1

pre-push

+#!/bin/sh
+# $1 -- Name of the remote to which the push is being done
+remote="$1"
+# $2 -- URL to which the push is being done
+url="$2"
+case $remote in
+    origin)
+        ;;
+    *)
+        echo pre-push: nothing to do for $remote
+        exit 0
+esac
+
+# <local ref> <local sha1> <remote ref> <remote sha1>
+while read local_ref local_sha remote_ref remote_sha
+do
+    echo pre-push: from $local_ref $local_sha
+    echo pre-push: to $remote_ref $remote_sha
+done
+
+exit 1