131 lines
3.8 KiB
Python
Executable file
131 lines
3.8 KiB
Python
Executable file
#!/usr/bin/env python
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import argparse
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import os
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import re
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import subprocess
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import sys
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def guess_base_commit(repo):
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"""Guess which commit the patches might be based on"""
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args = [
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'git',
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'-C',
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repo,
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'describe',
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'--tags',
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]
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return subprocess.check_output(args).split('-')[0:2]
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def format_patch(repo, since):
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args = [
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'git',
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'-C',
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repo,
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'format-patch',
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'--keep-subject',
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'--no-stat',
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'--stdout',
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# Per RFC 3676 the signature is separated from the body by a line with
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# '-- ' on it. If the signature option is omitted the signature defaults
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# to the Git version number.
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'--no-signature',
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# The name of the parent commit object isn't useful information in this
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# context, so zero it out to avoid needless patch-file churn.
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'--zero-commit',
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# Some versions of git print out different numbers of characters in the
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# 'index' line of patches, so pass --full-index to get consistent
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# behaviour.
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'--full-index',
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since
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]
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return subprocess.check_output(args)
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def split_patches(patch_data):
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"""Split a concatenated series of patches into N separate patches"""
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patches = []
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patch_start = re.compile('^From [0-9a-f]+ ')
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for line in patch_data.splitlines():
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if patch_start.match(line):
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patches.append([])
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patches[-1].append(line)
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return patches
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def munge_subject_to_filename(subject):
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"""Derive a suitable filename from a commit's subject"""
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if subject.endswith('.patch'):
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subject = subject[:-6]
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return re.sub(r'[^A-Za-z0-9-]+', '_', subject).strip('_').lower() + '.patch'
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def get_file_name(patch):
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"""Return the name of the file to which the patch should be written"""
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for line in patch:
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if line.startswith('Patch-Filename: '):
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return line[len('Patch-Filename: '):]
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# If no patch-filename header, munge the subject.
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for line in patch:
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if line.startswith('Subject: '):
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return munge_subject_to_filename(line[len('Subject: '):])
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def remove_patch_filename(patch):
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"""Strip out the Patch-Filename trailer from a patch's message body"""
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force_keep_next_line = False
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for i, l in enumerate(patch):
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is_patchfilename = l.startswith('Patch-Filename: ')
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next_is_patchfilename = i < len(patch) - 1 and patch[i+1].startswith('Patch-Filename: ')
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if not force_keep_next_line and (is_patchfilename or (next_is_patchfilename and len(l.rstrip()) == 0)):
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pass # drop this line
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else:
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yield l
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force_keep_next_line = l.startswith('Subject: ')
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def main(argv):
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parser = argparse.ArgumentParser()
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parser.add_argument("-o", "--output",
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help="directory into which exported patches will be written")
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parser.add_argument("patch_range",
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nargs='?',
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help="range of patches to export. Defaults to all commits since the "
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"most recent tag or remote branch.")
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args = parser.parse_args(argv)
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repo = '.'
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patch_range = args.patch_range
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if patch_range is None:
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patch_range, num_patches = guess_base_commit(repo)
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sys.stderr.write("Exporting {} patches since {}\n".format(num_patches, patch_range))
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patch_data = format_patch(repo, patch_range)
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patches = split_patches(patch_data)
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out_dir = args.output
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try:
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os.mkdir(out_dir)
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except OSError:
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pass
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# remove old patches, so that deleted commits are correctly reflected in the
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# patch files (as a removed file)
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for p in os.listdir(out_dir):
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if p.endswith('.patch'):
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os.remove(os.path.join(out_dir, p))
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with open(os.path.join(out_dir, '.patches'), 'w') as pl:
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for patch in patches:
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filename = get_file_name(patch)
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with open(os.path.join(out_dir, filename), 'w') as f:
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f.write('\n'.join(remove_patch_filename(patch)).rstrip('\n') + '\n')
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pl.write(filename + '\n')
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if __name__ == '__main__':
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main(sys.argv[1:])
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