[libgit2-glib/wip/albfan/python3] Use python3

[Alberto Fanjul <albfan src gnome org>]

commit 8a1da431dcbf4eda612b5189201f502fbf122726
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Fri Jun 28 18:22:50 2019 +0200

    Use python3

 libgit2-glib/meson.build |  5 ++---
 meson.build              | 11 +++--------
 meson_python_compile.py  |  8 +++-----
 3 files changed, 8 insertions(+), 16 deletions(-)
---
diff --git a/libgit2-glib/meson.build b/libgit2-glib/meson.build
index 9158178..3dad497 100644
--- a/libgit2-glib/meson.build
+++ b/libgit2-glib/meson.build
@@ -239,10 +239,9 @@ libgit2_glib_dep = declare_dependency(
 )
 
 if enable_python
-  python.install_sources(
+  install_data(
     'Ggit.py',
-    pure: false,
-    subdir: 'gi/overrides',
+    install_dir: join_paths(python.sysconfig_path('purelib'), 'gi', 'overrides'),
   )
 endif
 
diff --git a/meson.build b/meson.build
index 354ac6d..8b5efe9 100644
--- a/meson.build
+++ b/meson.build
@@ -38,8 +38,8 @@ libversion = '@0@.@1@.@2@'.format(soversion, current, revision)
 darwin_versions = [current + 1, '@0@.@1@'.format(current + 1, revision)]
 
 libgit2_glib_prefix = get_option('prefix')
-libgit2_glib_libdir = get_option('libdir')
-libgit2_glib_datadir = get_option('datadir')
+libgit2_glib_libdir = join_paths(libgit2_glib_prefix, get_option('libdir'))
+libgit2_glib_datadir = join_paths(libgit2_glib_prefix, get_option('datadir'))
 
 libgit2_glib_pkgincludedir = join_paths(get_option('includedir'), libgit2_glib_api_name, 
meson.project_name())
 
@@ -157,12 +157,7 @@ endif
 # Check for python
 enable_python = get_option('python')
 if enable_python
-  python = import('python').find_installation('python3')
-
-  python_req = '3.2.3'
-
-  dependency('pygobject-3.0', version: '>= 3.0.0')
-  assert(python.language_version().version_compare('>= ' + python_req), 'python support was requested, but 
version >= ' + python_req + ' not found.')
+  python = import('python3')
 
   meson.add_install_script('meson_python_compile.py', libgit2_glib_libdir)
 endif
diff --git a/meson_python_compile.py b/meson_python_compile.py
old mode 100644
new mode 100755
index 1fa54ff..1ffe0c0
--- a/meson_python_compile.py
+++ b/meson_python_compile.py
@@ -5,12 +5,10 @@ import subprocess
 import sys
 
 if not os.environ.get('DESTDIR'):
-  prefix = os.environ['MESON_INSTALL_PREFIX']
-
-  libdir = os.path.join(prefix, sys.argv[1])
+  libdir = sys.argv[1]
 
   print('Byte-compiling python modules...')
-  subprocess.call(['python', '-m', 'compileall', '-f', '-q', libdir])
+  subprocess.call(['python3', '-m', 'compileall', '-f', '-q', libdir])
 
   print('Byte-compiling python modules (optimized versions) ...')
-  subprocess.call(['python', '-O', '-m', 'compileall', '-f', '-q', libdir])
+  subprocess.call(['python3', '-O', '-m', 'compileall', '-f', '-q', libdir])