wafsamba: add samba_perl.py with SAMBA_CHECK_PERL() higher level check.

This checks for the perl binary, sets PERL and PERL_SPECIFIED
as well es the PERL_ARCH_INSTALL_DIR and PERL_LIB_INSTALL_DIR.

We want to avoid installing the perl modules outside the prefix.
I.e. generally,the perl modules should be installed
under "$prefix/share/perl5".

This improves the fixes for bug #10472.

The new strategy for automatically setting the paths is this:

- if the prefix equals perl's vendorprefix, then
  - PERL_LIB_INSTALL_DIR is set to perl's vendorlib dir
  - PERL_ARCH_INSTALL_DIR is set to perl's vendorarch dir
- otherwise:
  - PERL_LIB_INSTALL_DIR is set to ${DATADIR}/perl5
    (usually ${PREFIX}/share/perl5)
  - PERL_ARCH_INSTALL_DIR is set to ${LIBDIR}/perl5
    (usually ${PREFIX}/lib/perl5)

BUG: https://bugzilla.samba.org/show_bug.cgi?id=10472

Pair-Programmed-With: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Michael Adam <obnox@samba.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
(cherry picked from commit 75c3e240e0703be8c86596e689e466b4dee5e85e)

2 files changed, 63 insertions, 0 deletions

diff --git a/buildtools/wafsamba/samba_perl.py b/buildtools/wafsamba/samba_perl.py
new file mode 100644
index 0000000000..3909aba2ee
--- /dev/null
+++ b/buildtools/wafsamba/samba_perl.py
@@ -0,0 +1,62 @@
+import Build
+from samba_utils import *
+from Configure import conf
+
+done = {}
+
+@conf
+def SAMBA_CHECK_PERL(conf, mandatory=True, version=(5,0,0)):
+    #
+    # TODO: use the @runonce mechanism for this.
+    # The problem is that @runonce currently does
+    # not seem to work together with @conf...
+    # So @runonce (and/or) @conf needs fixing.
+    #
+    if "done" in done:
+        return
+    done["done"] = True
+    conf.find_program('perl', var='PERL', mandatory=mandatory)
+    conf.check_tool('perl')
+    path_perl = conf.find_program('perl')
+    conf.env.PERL_SPECIFIED = (conf.env.PERL != path_perl)
+    conf.check_perl_version(version)
+
+    def read_perl_config_var(cmd):
+        return Utils.to_list(Utils.cmd_output([conf.env.PERL, '-MConfig', '-e', cmd]))
+
+    def check_perl_config_var(var):
+        conf.start_msg("Checking for perl $Config{%s}:" % var)
+        try:
+            v = read_perl_config_var('print $Config{%s}' % var)[0]
+            conf.end_msg("'%s'" % (v), 'GREEN')
+            return v
+        except IndexError:
+            conf.end_msg(False, 'YELLOW')
+            pass
+        return None
+
+    vendor_prefix = check_perl_config_var('vendorprefix')
+
+    perl_arch_install_dir = None
+    if vendor_prefix == conf.env.PREFIX:
+        perl_arch_install_dir = check_perl_config_var('vendorarch');
+    if perl_arch_install_dir is None:
+        perl_arch_install_dir = "${LIBDIR}/perl5";
+    conf.start_msg("PERL_ARCH_INSTALL_DIR: ")
+    conf.end_msg("'%s'" % (perl_arch_install_dir), 'GREEN')
+    conf.env.PERL_ARCH_INSTALL_DIR = perl_arch_install_dir
+
+    perl_lib_install_dir = None
+    if vendor_prefix == conf.env.PREFIX:
+        perl_lib_install_dir = check_perl_config_var('vendorlib');
+    if perl_lib_install_dir is None:
+        perl_lib_install_dir = "${DATADIR}/perl5";
+    conf.start_msg("PERL_LIB_INSTALL_DIR: ")
+    conf.end_msg("'%s'" % (perl_lib_install_dir), 'GREEN')
+    conf.env.PERL_LIB_INSTALL_DIR = perl_lib_install_dir
+
+    perl_inc = read_perl_config_var('print "@INC"')
+    perl_inc.remove('.')
+    conf.start_msg("PERL_INC: ")
+    conf.end_msg("%s" % (perl_inc), 'GREEN')
+    conf.env.PERL_INC = perl_inc
diff --git a/buildtools/wafsamba/wafsamba.py b/buildtools/wafsamba/wafsamba.py
index 3f47a50b5d..032327b246 100644
--- a/buildtools/wafsamba/wafsamba.py
+++ b/buildtools/wafsamba/wafsamba.py
@@ -16,6 +16,7 @@ from samba_patterns import *
 from samba_pidl import *
 from samba_autoproto import *
 from samba_python import *
+from samba_perl import *
 from samba_deps import *
 from samba_bundled import *
 import samba_install