new package: openldap (#12748)

* new package: openldap

* fix mistake

* remove template text

* fix build error involving perl

* flake8

* improvements

* introduce multi valued variant for tls support

* improve tls variant

* overwrite build phase as opposed install

* improve style

var/spack/repos/builtin/packages/openldap/package.py

@@ -0,0 +1,92 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class Openldap(AutotoolsPackage):
+    """
+    OpenLDAP Software is an open source implementation of the Lightweight
+    Directory Access Protocol. The suite includes:
+
+    slapd - stand-alone LDAP daemon (server)
+    libraries implementing the LDAP protocol, and
+    utilities, tools, and sample clients.
+    """
+
+    homepage = "https://www.openldap.org/"
+    url      = "ftp://ftp.openldap.org/pub/OpenLDAP/openldap-release/openldap-2.4.9.tgz"
+
+    version('2.4.48', sha256='d9523ffcab5cd14b709fcf3cb4d04e8bc76bb8970113255f372bc74954c6074d')
+
+    variant('client_only', default=True, description='Client only installation')
+    variant('icu', default=False, description='Build with unicode support')
+    # Below, tls=none is not an option from programming point of view
+    # If +client_only, configure arguments for tls won't be enabled
+    variant('tls', default='gnutls', description='Build with TLS support',
+            values=('gnutls', 'openssl'), multi=False)
+
+    variant('perl', default=False, description='Perl backend to Slapd')
+
+    depends_on('icu4c', when='+icu')
+    depends_on('gnutls', when='~client_only tls=gnutls')
+    depends_on('openssl', when='~client_only tls=openssl')
+    depends_on('unixodbc', when='~client_only')
+    depends_on('postgresql', when='~client_only')
+    depends_on('berkeley-db', when='~client_only')  # for slapd
+    # Recommended dependencies by Linux From Scratch
+    # depends_on('cyrus-sasl', when='~client_only') # not avail. in spack yet
+    # depends_on('openslp', when='~client_only') # not avail. in spack yet
+    # depends_on('Pth', when='~client_only') # not avail. in spack yet
+    depends_on('perl', when='~client_only+perl')  # for slapd
+
+    # Ref: http://www.linuxfromscratch.org/blfs/view/svn/server/openldap.html
+    @when('+client_only')
+    def configure_args(self):
+        return ['CPPFLAGS=-D_GNU_SOURCE',
+                '--disable-static',
+                '--enable-dynamic',
+                '--disable-debug',
+                '--disable-slapd',
+                ]
+
+    @when('~client_only')
+    def configure_args(self):
+        # Ref: https://www.openldap.org/lists/openldap-technical/201009/msg00304.html
+        args = ['CPPFLAGS=-D_GNU_SOURCE',  # fixes a build error, see Ref above
+                '--disable-static',
+                '--disable-debug',
+                '--with-cyrus-sasl',
+                '--enable-dynamic',
+                '--enable-crypt',
+                '--enable-spasswd',
+                '--enable-slapd',
+                '--enable-modules',
+                '--enable-rlookups',
+                '--enable-backends=mod',
+                '--disable-ndb',
+                '--disable-sql',
+                '--disable-shell',
+                '--disable-bdb',
+                '--disable-hdb',
+                '--enable-overlays=mod',
+                ]
+
+        if '~client_only' in self.spec:
+            if 'tls=gnutls' in self.spec:
+                args.append('--with-tls=gnutls')
+            if 'tls=openssl' in self.spec:
+                args.append('--with-tls=openssl')
+
+        if '+perl' in self.spec:
+            args.append('--enable-perl')
+        else:
+            args.append('--disable-perl')
+
+        return args
+
+    def build(self, spec, prefix):
+        make('depend')
+        make()