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author | Matt Turner <mattst88@gentoo.org> | 2024-05-28 13:23:30 -0400 |
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committer | Matt Turner <mattst88@gentoo.org> | 2024-06-07 11:02:43 -0400 |
commit | 772aa90ea8bff350cd31887f37cc8d5cacfa8dad (patch) | |
tree | e149446ac3194d3e1d0754e0c846fcb6404444ed /pym | |
parent | bin/merge-driver-ekeyword: Don't pass program name to main() (diff) | |
download | gentoolkit-772aa90ea8bff350cd31887f37cc8d5cacfa8dad.tar.gz gentoolkit-772aa90ea8bff350cd31887f37cc8d5cacfa8dad.tar.bz2 gentoolkit-772aa90ea8bff350cd31887f37cc8d5cacfa8dad.zip |
bin/merge-driver-ekeyword: Move logic to a separate module
To facilitate unit testing.
Signed-off-by: Matt Turner <mattst88@gentoo.org>
Diffstat (limited to 'pym')
-rw-r--r-- | pym/gentoolkit/merge_driver_ekeyword/__init__.py | 0 | ||||
-rwxr-xr-x | pym/gentoolkit/merge_driver_ekeyword/merge_driver_ekeyword.py | 143 |
2 files changed, 143 insertions, 0 deletions
diff --git a/pym/gentoolkit/merge_driver_ekeyword/__init__.py b/pym/gentoolkit/merge_driver_ekeyword/__init__.py new file mode 100644 index 0000000..e69de29 --- /dev/null +++ b/pym/gentoolkit/merge_driver_ekeyword/__init__.py diff --git a/pym/gentoolkit/merge_driver_ekeyword/merge_driver_ekeyword.py b/pym/gentoolkit/merge_driver_ekeyword/merge_driver_ekeyword.py new file mode 100755 index 0000000..59527bb --- /dev/null +++ b/pym/gentoolkit/merge_driver_ekeyword/merge_driver_ekeyword.py @@ -0,0 +1,143 @@ +#!/usr/bin/python3 +# +# Copyright 2020-2024 Gentoo Authors +# Distributed under the terms of the GNU General Public License v2 or later + +""" +Custom git merge driver for handling conflicts in KEYWORDS assignments + +See https://git-scm.com/docs/gitattributes#_defining_a_custom_merge_driver +""" + +import difflib +import os +import shutil +import sys +import tempfile + +from typing import Optional +from collections.abc import Sequence + +from gentoolkit.ekeyword import ekeyword + + +KeywordChanges = list[tuple[Optional[list[str]], Optional[list[str]]]] + + +def keyword_array(keyword_line: str) -> list[str]: + # Find indices of string inside the double-quotes + i1: int = keyword_line.find('"') + 1 + i2: int = keyword_line.rfind('"') + + # Split into array of KEYWORDS + return keyword_line[i1:i2].split(' ') + + +def keyword_line_changes(old: str, new: str) -> KeywordChanges: + a: list[str] = keyword_array(old) + b: list[str] = keyword_array(new) + + s = difflib.SequenceMatcher(a=a, b=b) + + changes: KeywordChanges = [] + for tag, i1, i2, j1, j2 in s.get_opcodes(): + if tag == 'replace': + changes.append((a[i1:i2], b[j1:j2]),) + elif tag == 'delete': + changes.append((a[i1:i2], None),) + elif tag == 'insert': + changes.append((None, b[j1:j2]),) + else: + assert tag == 'equal' + return changes + + +def keyword_changes(ebuild1: str, ebuild2: str) -> Optional[KeywordChanges]: + with open(ebuild1) as e1, open(ebuild2) as e2: + lines1 = e1.readlines() + lines2 = e2.readlines() + + diff = difflib.unified_diff(lines1, lines2, n=0) + assert next(diff) == '--- \n' + assert next(diff) == '+++ \n' + + hunk: int = 0 + old: str = '' + new: str = '' + + for line in diff: + if line.startswith('@@ '): + if hunk > 0: + break + hunk += 1 + elif line.startswith('-'): + if old or new: + break + old = line + elif line.startswith('+'): + if not old or new: + break + new = line + else: + if 'KEYWORDS=' in old and 'KEYWORDS=' in new: + return keyword_line_changes(old, new) + return None + + +def apply_keyword_changes(ebuild: str, pathname: str, + changes: KeywordChanges) -> int: + result: int = 0 + + with tempfile.TemporaryDirectory() as tmpdir: + # ekeyword will only modify files named *.ebuild, so make a symlink + ebuild_symlink: str = os.path.join(tmpdir, os.path.basename(pathname)) + os.symlink(os.path.join(os.getcwd(), ebuild), ebuild_symlink) + + for removals, additions in changes: + args = [] + if removals: + for rem in removals: + # Drop leading '~' and '-' characters and prepend '^' + i = 1 if rem[0] in ('~', '-') else 0 + args.append('^' + rem[i:]) + if additions: + args.extend(additions) + args.append(ebuild_symlink) + + result = ekeyword.main(args) + if result != 0: + break + + return result + + +def main(argv: Sequence[str]) -> int: + if len(argv) != 4: + return -1 + + O = argv[0] # %O - filename of original + A = argv[1] # %A - filename of our current version + B = argv[2] # %B - filename of the other branch's version + P = argv[3] # %P - original path of the file + + # Get changes to KEYWORDS= from %O to %B + if changes := keyword_changes(O, B): + # Apply %O -> %B changes to %A + result = apply_keyword_changes(A, P, changes) + return result + # Get changes to KEYWORDS= from %O to %A + elif changes := keyword_changes(O, A): + # Apply %O -> %A changes to %B + result = apply_keyword_changes(B, P, changes) + # Merged file should be left in %A + shutil.move(B, A) + return result + else: + try: + os.execlp("git", "git", "merge-file", "-L", "HEAD", "-L", "base", "-L", "ours", A, O, B) + except OSError: + return -1 + + +if __name__ == "__main__": + sys.exit(main(sys.argv[1:])) |