forked from adamm/git-importer
267 lines
8.0 KiB
Python
267 lines
8.0 KiB
Python
import fnmatch
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import logging
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import pathlib
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import subprocess
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import pygit2
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from lib.binary import BINARY
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LFS_SUFFIX = "filter=lfs diff=lfs merge=lfs -text"
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class Git:
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"""Local git repository"""
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def __init__(self, path, committer=None, committer_email=None):
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self.path = pathlib.Path(path)
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self.committer = committer
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self.committer_email = committer_email
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self.repo = None
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def is_open(self):
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return self.repo is not None
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# TODO: Extend it to packages and files
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def exists(self):
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"""Check if the path is a valid git repository"""
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return (self.path / ".git").exists()
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def create(self):
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"""Create a local git repository"""
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self.path.mkdir(parents=True, exist_ok=True)
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# Convert the path to string, to avoid some limitations in
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# older pygit2
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self.repo = pygit2.init_repository(str(self.path))
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return self
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def is_dirty(self):
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"""Check if there is something to commit"""
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assert self.is_open()
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return self.repo.status()
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def branches(self):
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return list(self.repo.branches)
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def branch(self, branch, commit=None):
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if not commit:
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commit = self.repo.head
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else:
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commit = self.repo.get(commit)
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self.repo.branches.local.create(branch, commit)
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def checkout(self, branch):
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"""Checkout into the branch HEAD"""
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new_branch = False
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ref = f"refs/heads/{branch}"
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if branch not in self.branches():
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self.repo.references["HEAD"].set_target(ref)
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new_branch = True
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else:
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self.repo.checkout(ref)
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return new_branch
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def commit(
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self,
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user,
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user_email,
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user_time,
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message,
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parents=None,
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committer=None,
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committer_email=None,
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committer_time=None,
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allow_empty=False,
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):
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"""Add all the files and create a new commit in the current HEAD"""
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assert allow_empty or self.is_dirty()
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if not committer:
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committer = self.committer if self.committer else self.user
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committer_email = (
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self.committer_email if self.committer_email else self.user_email
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)
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committer_time = committer_time if committer_time else user_time
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try:
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self.repo.index.add_all()
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except pygit2.GitError as e:
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if not allow_empty:
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raise e
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self.repo.index.write()
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author = pygit2.Signature(user, user_email, int(user_time.timestamp()))
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committer = pygit2.Signature(
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committer, committer_email, int(committer_time.timestamp())
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)
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if not parents:
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try:
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parents = [self.repo.head.target]
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except pygit2.GitError as e:
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parents = []
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if not allow_empty:
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raise e
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tree = self.repo.index.write_tree()
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return self.repo.create_commit(
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"HEAD", author, committer, message, tree, parents
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)
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def merge(
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self,
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user,
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user_email,
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user_time,
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message,
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commit,
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committer=None,
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committer_email=None,
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committer_time=None,
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clean_on_conflict=True,
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merged=False,
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allow_empty=False,
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):
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new_branch = False
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if not merged:
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try:
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self.repo.merge(commit)
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except KeyError:
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# If it is the first commit, we will have a missing
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# "HEAD", but the files will be there. We can proceed
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# to the commit directly.
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new_branch = True
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if not merged and self.repo.index.conflicts:
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for conflict in self.repo.index.conflicts:
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conflict = [c for c in conflict if c]
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if conflict:
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logging.info(f"CONFLICT {conflict[0].path}")
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if clean_on_conflict:
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self.clean()
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# Now I miss Rust enums
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return "CONFLICT"
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# Some merges are empty in OBS (no changes, not sure
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# why), for now we signal them
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if not allow_empty and not self.is_dirty():
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# I really really do miss Rust enums
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return "EMPTY"
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if new_branch:
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parents = [commit]
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else:
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parents = [
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self.repo.head.target,
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commit,
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]
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commit = self.commit(
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user,
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user_email,
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user_time,
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message,
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parents,
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committer,
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committer_email,
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committer_time,
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allow_empty=allow_empty,
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)
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return commit
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def merge_abort(self):
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self.repo.state_cleanup()
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def last_commit(self):
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try:
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return self.repo.head.target
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except:
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return None
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def branch_head(self, branch):
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return self.repo.references["refs/heads/" + branch].target
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def gc(self):
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logging.info(f"Garbage recollect and repackage {self.path}")
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subprocess.run(
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["git", "gc", "--auto"],
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cwd=self.path,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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)
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def clean(self):
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for path, _ in self.repo.status().items():
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logging.debug(f"Cleaning {path}")
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try:
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(self.path / path).unlink()
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self.repo.index.remove(path)
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except Exception as e:
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logging.warning(f"Error removing file {path}: {e}")
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def add(self, filename):
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self.repo.index.add(filename)
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def add_default_lfs_gitattributes(self, force=False):
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if not (self.path / ".gitattributes").exists() or force:
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with (self.path / ".gitattributes").open("w") as f:
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content = ["## Default LFS"]
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content += [f"*{b} {LFS_SUFFIX}" for b in sorted(BINARY)]
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f.write("\n".join(content))
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f.write("\n")
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self.add(".gitattributes")
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def add_specific_lfs_gitattributes(self, binaries):
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self.add_default_lfs_gitattributes(force=True)
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if binaries:
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with (self.path / ".gitattributes").open("a") as f:
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content = ["## Specific LFS patterns"]
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content += [f"{b} {LFS_SUFFIX}" for b in sorted(binaries)]
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f.write("\n".join(content))
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f.write("\n")
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self.add(".gitattributes")
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def get_specific_lfs_gitattributes(self):
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with (self.path / ".gitattributes").open() as f:
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patterns = [
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line.split()[0]
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for line in f
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if line.strip() and not line.startswith("#")
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]
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binary = {f"*{b}" for b in BINARY}
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return [p for p in patterns if p not in binary]
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def add_lfs(self, filename, sha256, size):
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with (self.path / filename).open("w") as f:
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f.write("version https://git-lfs.github.com/spec/v1\n")
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f.write(f"oid sha256:{sha256}\n")
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f.write(f"size {size}\n")
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self.add(filename)
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if not self.is_lfs_tracked(filename):
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logging.debug(f"Add specific LFS file {filename}")
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specific_patterns = self.get_specific_lfs_gitattributes()
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specific_patterns.append(filename)
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self.add_specific_lfs_gitattributes(specific_patterns)
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def is_lfs_tracked(self, filename):
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with (self.path / ".gitattributes").open() as f:
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patterns = (
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line.split()[0]
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for line in f
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if line.strip() and not line.startswith("#")
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)
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return any(fnmatch.fnmatch(filename, line) for line in patterns)
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def remove(self, filename):
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self.repo.index.remove(filename)
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(self.path / filename).unlink()
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patterns = self.get_specific_lfs_gitattributes()
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if filename in patterns:
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patterns.remove(filename)
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self.add_specific_lfs_gitattributes(patterns)
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