Re: [Xen-devel] [RFC v5 026/126] python: add commit-per-subsystem.py

[Marc-André Lureau <marcandre.lureau@xxxxxxxxx>]

Hi

On Fri, Oct 11, 2019 at 9:11 PM Vladimir Sementsov-Ogievskiy
<vsementsov@xxxxxxxxxxxxx> wrote:
>
> Add script to automatically commit tree-wide changes per-subsystem.

Oh interesting! I guess it could use a --help or a larger commit
message to explain a bit what it does (I imagine from the rest of the
series, but someone looking at the script without context may wonder;)

You could also fix some pep8/pylint/pycodestyle

>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxx>
> ---
>
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>
>  python/commit-per-subsystem.py | 204 +++++++++++++++++++++++++++++++++
>  1 file changed, 204 insertions(+)
>  create mode 100755 python/commit-per-subsystem.py
>
> diff --git a/python/commit-per-subsystem.py b/python/commit-per-subsystem.py
> new file mode 100755
> index 0000000000..2ccf84cb15
> --- /dev/null
> +++ b/python/commit-per-subsystem.py
> @@ -0,0 +1,204 @@
> +#!/usr/bin/env python3
> +#
> +# Copyright (c) 2019 Virtuozzo International GmbH
> +#
> +# This program is free software; you can redistribute it and/or modify
> +# it under the terms of the GNU General Public License as published by
> +# the Free Software Foundation; either version 2 of the License, or
> +# (at your option) any later version.
> +#
> +# This program is distributed in the hope that it will be useful,
> +# but WITHOUT ANY WARRANTY; without even the implied warranty of
> +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +# GNU General Public License for more details.
> +#
> +# You should have received a copy of the GNU General Public License
> +# along with this program.  If not, see <http://www.gnu.org/licenses/>.
> +#
> +
> +import subprocess
> +import sys
> +import os
> +import glob
> +
> +
> +def git_add(pattern):
> +    subprocess.run(['git', 'add', pattern])
> +
> +
> +def git_commit(msg):
> +    subprocess.run(['git', 'commit', '-m', msg], capture_output=True)
> +
> +
> +def git_changed_files():
> +    ret = subprocess.check_output(['git', 'diff', '--name-only'], 
> encoding='utf-8').split('\n')
> +    if ret[-1] == '':
> +        del ret[-1]
> +    return ret
> +
> +
> +maintainers = sys.argv[1]
> +message = sys.argv[2].strip()
> +
> +subsystem = None
> +
> +remap = {
> +    'Block layer core': 'block',
> +    'Block Jobs': 'block',
> +    'Dirty Bitmaps': 'block',
> +    'Block QAPI, monitor, command line': 'block',
> +    'Block I/O path': 'block',
> +    'Throttling infrastructure': 'block',
> +    'Architecture support': 's390x',
> +    'Guest CPU Cores (KVM)': 'kvm',
> +    'Guest CPU Cores (Xen)': 'xen',
> +    'Guest CPU cores (TCG)': 'tcg',
> +    'Network Block Device (NBD)': 'nbd',
> +    'Parallel NOR Flash devices': 'pflash',
> +    'Firmware configuration (fw_cfg)': 'fw_cfg',
> +    'Block SCSI subsystem': 'scsi',
> +    'Network device backends': 'net',
> +    'Netmap network backend': 'net',
> +    'Host Memory Backends': 'hostmem',
> +    'Cryptodev Backends': 'cryptodev',
> +    'QEMU Guest Agent': 'qga',
> +    'COLO Framework': 'colo',
> +    'Command line option argument parsing': 'cmdline',
> +    'Character device backends': 'chardev'
> +}
> +
> +
> +class Maintainers:
> +    def add(self, subsystem, path, mapper, mapper_name, glob_count=1):
> +        if subsystem in remap:
> +            subsystem = remap[subsystem]
> +        if subsystem not in self.subsystems:
> +            self.subsystems.append(subsystem)
> +
> +        if path[-1] == '/':
> +            path = path[:-1]
> +
> +        if path in mapper:
> +            if mapper[path][1] == glob_count:
> +                print('Warning: "{}" both in "{}" and "{}" in {} mapper with 
> '
> +                      'same glob-count={}. {} ignored for this path.'.format(
> +                        path, mapper[path][0], subsystem, mapper_name, 
> glob_count,
> +                          subsystem))
> +                return
> +            if mapper[path][1] < glob_count:
> +                # silently ignore worse match
> +                return
> +
> +        mapper[path] = (subsystem, glob_count)
> +
> +    def __init__(self, file_name):
> +        self.map_file = {}
> +        self.map_glob_file = {}
> +        self.map_dir = {}
> +        self.map_glob_dir = {}
> +        self.map_unmaintained_dir = {
> +            'python': ('python', 1),
> +            'hw/misc': ('misc', 1)
> +        }
> +        self.subsystems = ['python', 'misc']
> +        subsystem = None
> +
> +        with open(file_name) as f:
> +            mode2 = False
> +            prevline = ''
> +            for line in f:
> +                line = line.rstrip()
> +                if not line:
> +                    continue
> +                if len(line) >= 2 and line[1] == ':':
> +                    if line[0] == 'F':
> +                        fname = line[3:]
> +                        if fname in ['*', '*/']:
> +                            continue
> +                        if os.path.isfile(fname):
> +                            self.add(subsystem, fname, self.map_file, 'file')
> +                        elif os.path.isdir(fname):
> +                            self.add(subsystem, fname, self.map_dir, 'dir')
> +                        else:
> +                            paths = glob.glob(fname)
> +                            if not paths:
> +                                print('Warning: nothing corresponds to 
> "{}"'.format(fname))
> +                                continue
> +
> +                            n = len(paths)
> +                            for f in paths:
> +                                if os.path.isfile(f):
> +                                    self.add(subsystem, f, 
> self.map_glob_file, 'glob-file', n)
> +                                else:
> +                                    assert os.path.isdir(f)
> +                                    self.add(subsystem, f, 
> self.map_glob_dir, 'glob-dir', n)
> +                elif line[:3] == '---':
> +                    subsystem = prevline
> +                    if subsystem == 'Devices':
> +                        mode2 = True
> +                elif mode2:
> +                    subsystem = line
> +                prevline = line
> +
> +    def find_in_map_dir(self, file_name, mapper):
> +        while file_name != '' and file_name not in mapper:
> +            file_name = os.path.dirname(file_name)
> +
> +        return None if file_name == '' else mapper[file_name][0]
> +
> +    def find_in_map_file(self, file_name, mapper):
> +        if file_name in mapper:
> +            return mapper[file_name][0]
> +
> +    def find_subsystem(self, file_name):
> +        s = self.find_in_map_file(file_name, self.map_file)
> +        if s is not None:
> +            return s
> +
> +        s = self.find_in_map_file(file_name, self.map_glob_file)
> +        if s is not None:
> +            return s
> +
> +        s = self.find_in_map_dir(file_name, self.map_dir)
> +        if s is not None:
> +            return s
> +
> +        s = self.find_in_map_dir(file_name, self.map_glob_dir)
> +        if s is not None:
> +            return s
> +
> +        s = self.find_in_map_dir(file_name, self.map_unmaintained_dir)
> +        if s is not None:
> +            return s
> +
> +        self.subsystems.append(file_name)
> +        return file_name
> +
> +
> +def commit(subsystem):
> +    msg = subsystem
> +    if msg in remap:
> +        msg = remap[msg]
> +    msg += ': ' + message
> +    git_commit(msg)
> +
> +mnt = Maintainers(maintainers)
> +res = {}
> +for f in git_changed_files():
> +    s = mnt.find_subsystem(f)
> +    if s in res:
> +        res[s].append(f)
> +    else:
> +        res[s] = [f]
> +
> +for s in mnt.subsystems:
> +    if s in res:
> +        print(s)
> +        for f in res[s]:
> +            print('  ', f)
> +
> +for s in mnt.subsystems:
> +    if s in res:
> +        for f in res[s]:
> +            git_add(f)
> +        commit(s)
> --
> 2.21.0
>
>


-- 
Marc-André Lureau

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