Move setup command handling to its own msetup.py file

1 files changed, 227 insertions, 0 deletions

diff --git a/mesonbuild/msetup.py b/mesonbuild/msetup.py
new file mode 100644
index 0000000..b07e7c4
--- /dev/null
+++ b/mesonbuild/msetup.py
@@ -0,0 +1,227 @@
+# Copyright 2016-2018 The Meson development team
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import time
+import sys, stat
+import datetime
+import os.path
+import platform
+import cProfile as profile
+import argparse
+import traceback
+
+from . import environment, interpreter, mesonlib
+from . import build
+from . import mlog, coredata
+from .mesonlib import MesonException
+from .wrap import WrapMode
+
+def buildparser():
+    parser = argparse.ArgumentParser(prog='meson')
+    coredata.register_builtin_arguments(parser)
+    parser.add_argument('--cross-file', default=None,
+                        help='File describing cross compilation environment.')
+    parser.add_argument('-v', '--version', action='version',
+                        version=coredata.version)
+    # See the mesonlib.WrapMode enum for documentation
+    parser.add_argument('--wrap-mode', default=None,
+                        type=wrapmodetype, choices=WrapMode,
+                        help='Special wrap mode to use')
+    parser.add_argument('--profile-self', action='store_true', dest='profile',
+                        help=argparse.SUPPRESS)
+    parser.add_argument('--fatal-meson-warnings', action='store_true', dest='fatal_warnings',
+                        help='Make all Meson warnings fatal')
+    parser.add_argument('--reconfigure', action='store_true',
+                        help='Set options and reconfigure the project. Useful when new ' +
+                             'options have been added to the project and the default value ' +
+                             'is not working.')
+    parser.add_argument('builddir', nargs='?', default=None)
+    parser.add_argument('sourcedir', nargs='?', default=None)
+    return parser
+
+def wrapmodetype(string):
+    try:
+        return getattr(WrapMode, string)
+    except AttributeError:
+        msg = ', '.join([t.name.lower() for t in WrapMode])
+        msg = 'invalid argument {!r}, use one of {}'.format(string, msg)
+        raise argparse.ArgumentTypeError(msg)
+
+class MesonApp:
+    def __init__(self, options):
+        (self.source_dir, self.build_dir) = self.validate_dirs(options.builddir,
+                                                               options.sourcedir,
+                                                               options.reconfigure)
+        self.options = options
+
+    def has_build_file(self, dirname):
+        fname = os.path.join(dirname, environment.build_filename)
+        return os.path.exists(fname)
+
+    def validate_core_dirs(self, dir1, dir2):
+        if dir1 is None:
+            if dir2 is None:
+                if not os.path.exists('meson.build') and os.path.exists('../meson.build'):
+                    dir2 = '..'
+                else:
+                    raise MesonException('Must specify at least one directory name.')
+            dir1 = os.getcwd()
+        if dir2 is None:
+            dir2 = os.getcwd()
+        ndir1 = os.path.abspath(os.path.realpath(dir1))
+        ndir2 = os.path.abspath(os.path.realpath(dir2))
+        if not os.path.exists(ndir1):
+            os.makedirs(ndir1)
+        if not os.path.exists(ndir2):
+            os.makedirs(ndir2)
+        if not stat.S_ISDIR(os.stat(ndir1).st_mode):
+            raise MesonException('%s is not a directory' % dir1)
+        if not stat.S_ISDIR(os.stat(ndir2).st_mode):
+            raise MesonException('%s is not a directory' % dir2)
+        if os.path.samefile(dir1, dir2):
+            raise MesonException('Source and build directories must not be the same. Create a pristine build directory.')
+        if self.has_build_file(ndir1):
+            if self.has_build_file(ndir2):
+                raise MesonException('Both directories contain a build file %s.' % environment.build_filename)
+            return ndir1, ndir2
+        if self.has_build_file(ndir2):
+            return ndir2, ndir1
+        raise MesonException('Neither directory contains a build file %s.' % environment.build_filename)
+
+    def validate_dirs(self, dir1, dir2, reconfigure):
+        (src_dir, build_dir) = self.validate_core_dirs(dir1, dir2)
+        priv_dir = os.path.join(build_dir, 'meson-private/coredata.dat')
+        if os.path.exists(priv_dir):
+            if not reconfigure:
+                print('Directory already configured.\n'
+                      '\nJust run your build command (e.g. ninja) and Meson will regenerate as necessary.\n'
+                      'If ninja fails, run "ninja reconfigure" or "meson --reconfigure"\n'
+                      'to force Meson to regenerate.\n'
+                      '\nIf build failures persist, manually wipe your build directory to clear any\n'
+                      'stored system data.\n'
+                      '\nTo change option values, run "meson configure" instead.')
+                sys.exit(0)
+        else:
+            if reconfigure:
+                print('Directory does not contain a valid build tree:\n{}'.format(build_dir))
+                sys.exit(1)
+        return src_dir, build_dir
+
+    def check_pkgconfig_envvar(self, env):
+        curvar = os.environ.get('PKG_CONFIG_PATH', '')
+        if curvar != env.coredata.pkgconf_envvar:
+            mlog.warning('PKG_CONFIG_PATH has changed between invocations from "%s" to "%s".' %
+                         (env.coredata.pkgconf_envvar, curvar))
+            env.coredata.pkgconf_envvar = curvar
+
+    def generate(self):
+        env = environment.Environment(self.source_dir, self.build_dir, self.options)
+        mlog.initialize(env.get_log_dir(), self.options.fatal_warnings)
+        if self.options.profile:
+            mlog.set_timestamp_start(time.monotonic())
+        with mesonlib.BuildDirLock(self.build_dir):
+            self._generate(env)
+
+    def _generate(self, env):
+        mlog.debug('Build started at', datetime.datetime.now().isoformat())
+        mlog.debug('Main binary:', sys.executable)
+        mlog.debug('Python system:', platform.system())
+        mlog.log(mlog.bold('The Meson build system'))
+        self.check_pkgconfig_envvar(env)
+        mlog.log('Version:', coredata.version)
+        mlog.log('Source dir:', mlog.bold(self.source_dir))
+        mlog.log('Build dir:', mlog.bold(self.build_dir))
+        if env.is_cross_build():
+            mlog.log('Build type:', mlog.bold('cross build'))
+        else:
+            mlog.log('Build type:', mlog.bold('native build'))
+        b = build.Build(env)
+
+        intr = interpreter.Interpreter(b)
+        if env.is_cross_build():
+            mlog.log('Host machine cpu family:', mlog.bold(intr.builtin['host_machine'].cpu_family_method([], {})))
+            mlog.log('Host machine cpu:', mlog.bold(intr.builtin['host_machine'].cpu_method([], {})))
+            mlog.log('Target machine cpu family:', mlog.bold(intr.builtin['target_machine'].cpu_family_method([], {})))
+            mlog.log('Target machine cpu:', mlog.bold(intr.builtin['target_machine'].cpu_method([], {})))
+        mlog.log('Build machine cpu family:', mlog.bold(intr.builtin['build_machine'].cpu_family_method([], {})))
+        mlog.log('Build machine cpu:', mlog.bold(intr.builtin['build_machine'].cpu_method([], {})))
+        if self.options.profile:
+            fname = os.path.join(self.build_dir, 'meson-private', 'profile-interpreter.log')
+            profile.runctx('intr.run()', globals(), locals(), filename=fname)
+        else:
+            intr.run()
+        # Print all default option values that don't match the current value
+        for def_opt_name, def_opt_value, cur_opt_value in intr.get_non_matching_default_options():
+            mlog.log('Option', mlog.bold(def_opt_name), 'is:',
+                     mlog.bold(str(cur_opt_value)),
+                     '[default: {}]'.format(str(def_opt_value)))
+        try:
+            dumpfile = os.path.join(env.get_scratch_dir(), 'build.dat')
+            # We would like to write coredata as late as possible since we use the existence of
+            # this file to check if we generated the build file successfully. Since coredata
+            # includes settings, the build files must depend on it and appear newer. However, due
+            # to various kernel caches, we cannot guarantee that any time in Python is exactly in
+            # sync with the time that gets applied to any files. Thus, we dump this file as late as
+            # possible, but before build files, and if any error occurs, delete it.
+            cdf = env.dump_coredata()
+            if self.options.profile:
+                fname = 'profile-{}-backend.log'.format(intr.backend.name)
+                fname = os.path.join(self.build_dir, 'meson-private', fname)
+                profile.runctx('intr.backend.generate(intr)', globals(), locals(), filename=fname)
+            else:
+                intr.backend.generate(intr)
+            build.save(b, dumpfile)
+            # Post-conf scripts must be run after writing coredata or else introspection fails.
+            intr.backend.run_postconf_scripts()
+        except:
+            if 'cdf' in locals():
+                old_cdf = cdf + '.prev'
+                if os.path.exists(old_cdf):
+                    os.replace(old_cdf, cdf)
+                else:
+                    os.unlink(cdf)
+            raise
+
+def run(args):
+    args = mesonlib.expand_arguments(args)
+    options = buildparser().parse_args(args)
+    coredata.parse_cmd_line_options(options)
+    try:
+        app = MesonApp(options)
+    except Exception as e:
+        # Log directory does not exist, so just print
+        # to stdout.
+        print('Error during basic setup:\n')
+        print(e)
+        return 1
+    try:
+        app.generate()
+    except Exception as e:
+        if isinstance(e, MesonException):
+            mlog.exception(e)
+            # Path to log file
+            mlog.shutdown()
+            logfile = os.path.join(app.build_dir, environment.Environment.log_dir, mlog.log_fname)
+            mlog.log("\nA full log can be found at", mlog.bold(logfile))
+            if os.environ.get('MESON_FORCE_BACKTRACE'):
+                raise
+            return 1
+        else:
+            if os.environ.get('MESON_FORCE_BACKTRACE'):
+                raise
+            traceback.print_exc()
+            return 2
+    finally:
+        mlog.shutdown()
+    return 0