Fix git-send-email.

git-send-email depends on Net::SMTP and Net::SMTP::SSL.  Make
sendEmailSupport a config for git, and bring these libraries.  Wrap
the send-email script, or replace with a not supported script.

svn path=/nixpkgs/trunk/; revision=21789

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

@@ -1,9 +1,10 @@
 { fetchurl, stdenv, curl, openssl, zlib, expat, perl, python, gettext, cpio
 , asciidoc, texinfo, xmlto, docbook2x, docbook_xsl, docbook_xml_dtd_45
 , libxslt, tcl, tk, makeWrapper
-, svnSupport, subversion, perlLibs
+, svnSupport, subversion, perlLibs, smtpPerlLibs
 , guiSupport
 , pythonSupport ? true
+, sendEmailSupport
 }:
 
 let
@@ -60,6 +61,18 @@ stdenv.mkDerivation rec {
         notSupported $out/bin/git-svn "reinstall with config git = { svnSupport = true } set"
        '')
 
+   + (if sendEmailSupport then
+      ''# wrap git-send-email
+        gitperllib=$out/lib/perl5/site_perl
+        for i in ${builtins.toString smtpPerlLibs}; do
+          gitperllib=$gitperllib:$i/lib/perl5/site_perl
+        done
+        wrapProgram "$out/libexec/git-core/git-send-email"     \
+                     --set GITPERLLIB "$gitperllib" ''
+       else '' # replace git-send-email by notification script
+        notSupported $out/bin/git-send-email "reinstall with config git = { sendEmailSupport = true } set"
+       '')
+
    + ''# Install man pages and Info manual
        make PERL_PATH="${perl}/bin/perl" cmd-list.made install install-info \
          -C Documentation ''