171 lines
6.5 KiB
Python
171 lines
6.5 KiB
Python
#! /usr/bin/env python
|
|
#
|
|
# SCons - a Software Constructor
|
|
#
|
|
# MIT License
|
|
#
|
|
# Copyright The SCons Foundation
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining
|
|
# a copy of this software and associated documentation files (the
|
|
# "Software"), to deal in the Software without restriction, including
|
|
# without limitation the rights to use, copy, modify, merge, publish,
|
|
# distribute, sublicense, and/or sell copies of the Software, and to
|
|
# permit persons to whom the Software is furnished to do so, subject to
|
|
# the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included
|
|
# in all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
|
|
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
|
|
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
|
|
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
|
|
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
|
|
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
|
|
"""Show or convert the configuration of an SCons cache directory.
|
|
|
|
A cache of derived files is stored by file signature.
|
|
The files are split into directories named by the first few
|
|
digits of the signature. The prefix length used for directory
|
|
names can be changed by this script.
|
|
"""
|
|
|
|
import argparse
|
|
import glob
|
|
import json
|
|
import os
|
|
|
|
def rearrange_cache_entries(current_prefix_len, new_prefix_len):
|
|
"""Move cache files if prefix length changed.
|
|
|
|
Move the existing cache files to new directories of the
|
|
appropriate name length and clean up the old directories.
|
|
"""
|
|
print('Changing prefix length from', current_prefix_len,
|
|
'to', new_prefix_len)
|
|
dirs = set()
|
|
old_dirs = set()
|
|
for file in glob.iglob(os.path.join('*', '*')):
|
|
name = os.path.basename(file)
|
|
dname = name[:current_prefix_len].upper()
|
|
if dname not in old_dirs:
|
|
print('Migrating', dname)
|
|
old_dirs.add(dname)
|
|
dname = name[:new_prefix_len].upper()
|
|
if dname not in dirs:
|
|
os.mkdir(dname)
|
|
dirs.add(dname)
|
|
os.rename(file, os.path.join(dname, name))
|
|
|
|
# Now delete the original directories
|
|
for dname in old_dirs:
|
|
os.rmdir(dname)
|
|
|
|
|
|
# The configuration dictionary should have one entry per entry in the
|
|
# cache config. The value of each entry should include the following:
|
|
# implicit - (optional) This is to allow adding a new config entry and also
|
|
# changing the behaviour of the system at the same time. This
|
|
# indicates the value the config entry would have had if it had
|
|
# been specified.
|
|
# default - The value the config entry should have if it wasn't previously
|
|
# specified
|
|
# command-line - parameters to pass to ArgumentParser.add_argument
|
|
# converter - (optional) Function to call if conversion is required
|
|
# if this configuration entry changes
|
|
config_entries = {
|
|
'prefix_len': {
|
|
'implicit': 1,
|
|
'default': 2,
|
|
'command-line': {
|
|
'help': 'Length of cache file name used as subdirectory prefix',
|
|
'metavar': '<number>',
|
|
'type': int
|
|
},
|
|
'converter': rearrange_cache_entries
|
|
}
|
|
}
|
|
|
|
|
|
def main():
|
|
parser = argparse.ArgumentParser(
|
|
description='Modify the configuration of an scons cache directory',
|
|
epilog='''
|
|
Unspecified options will not be changed unless they are not
|
|
set at all, in which case they are set to an appropriate default.
|
|
''')
|
|
|
|
parser.add_argument('cache-dir', help='Path to scons cache directory')
|
|
for param in config_entries:
|
|
parser.add_argument('--' + param.replace('_', '-'),
|
|
**config_entries[param]['command-line'])
|
|
parser.add_argument('--version',
|
|
action='version',
|
|
version='%(prog)s 1.0')
|
|
parser.add_argument('--show',
|
|
action="store_true",
|
|
help="show current configuration")
|
|
|
|
# Get the command line as a dict without any of the unspecified entries.
|
|
args = dict([x for x in vars(parser.parse_args()).items() if x[1]])
|
|
|
|
# It seems somewhat strange to me, but positional arguments don't get the -
|
|
# in the name changed to _, whereas optional arguments do...
|
|
cache = args['cache-dir']
|
|
if not os.path.isdir(cache):
|
|
raise RuntimeError("There is no cache directory named %s" % cache)
|
|
os.chdir(cache)
|
|
del args['cache-dir']
|
|
|
|
if not os.path.exists('config'):
|
|
# old config dirs did not have a 'config' file. Try to update.
|
|
# Validate the only files in the directory are directories 0-9, a-f
|
|
expected = ['{:X}'.format(x) for x in range(0, 16)]
|
|
if not set(os.listdir('.')).issubset(expected):
|
|
raise RuntimeError(
|
|
"%s does not look like a valid version 1 cache directory" % cache)
|
|
config = dict()
|
|
else:
|
|
with open('config') as conf:
|
|
config = json.load(conf)
|
|
|
|
if args.get('show', None):
|
|
print("Current configuration in '%s':" % cache)
|
|
print(json.dumps(config, sort_keys=True,
|
|
indent=4, separators=(',', ': ')))
|
|
# in case of the show argument, emit some stats as well
|
|
file_count = 0
|
|
for _, _, files in os.walk('.'):
|
|
file_count += len(files)
|
|
if file_count: # skip config file if it exists
|
|
file_count -= 1
|
|
print("Cache contains %s files" % file_count)
|
|
del args['show']
|
|
|
|
# Find any keys that are not currently set but should be
|
|
for key in config_entries:
|
|
if key not in config:
|
|
if 'implicit' in config_entries[key]:
|
|
config[key] = config_entries[key]['implicit']
|
|
else:
|
|
config[key] = config_entries[key]['default']
|
|
if key not in args:
|
|
args[key] = config_entries[key]['default']
|
|
|
|
# Now go through each entry in args to see if it changes an existing config
|
|
# setting.
|
|
for key in args:
|
|
if args[key] != config[key]:
|
|
if 'converter' in config_entries[key]:
|
|
config_entries[key]['converter'](config[key], args[key])
|
|
config[key] = args[key]
|
|
|
|
# and write the updated config file
|
|
with open('config', 'w') as conf:
|
|
json.dump(config, conf)
|
|
|
|
if __name__ == "__main__":
|
|
main()
|