from typing import Dict from xmlrpc.client import Boolean from lib.db_revision import DBRevision from lib.flat_walker import FlatTreeWalker from lib.request import Request class AbstractWalker: def call(self, node, is_source): pass class PrintWalker(AbstractWalker): def call(self, node, is_source): if is_source: print(" ", node.revision.short_string(), node.revision.files_hash) else: merge_str = "" if node.merged: merge_str = f"merged:{node.merged.revision.short_string()}" print(node.revision.short_string(), node.revision.files_hash, merge_str) class TreeNode: """ Nodes in this "tree" have either no parent (root), one parent (in a chain) or two parents (in this case the merged revision wins in conflicts). """ def __init__(self, rev): self.parent = None self.merged = None self.revision = rev self.merged_into = None self.git_commit = None def walk(self, walker: AbstractWalker): node = self while node: walker.call(node, False) if node.merged: source_node = node.merged while source_node: walker.call(source_node, True) source_node = source_node.parent if source_node and source_node.merged_into: break node = node.parent def print(self): self.walk(PrintWalker()) def as_flat_list(self): """Return the tree as git commits to do""" ftw = FlatTreeWalker() self.walk(ftw) return ftw.flats def as_list(self): """Return a list for test cases""" node = self ret = [] while node: repr = {"commit": node.revision.short_string()} if node.merged: source_node = node.merged repr["merged"] = [] while source_node: repr["merged"].append(source_node.revision.short_string()) source_node = source_node.parent if source_node and source_node.merged_into: break node = node.parent ret.append(repr) return ret class TreeBuilder: def __init__(self, db): self.db = db def revisions_chain(self, project, package): """Build a tree without branches (chain) from a project's history ignoring empty and broken revisions""" revisions = DBRevision.all_revisions(self.db, project, package) revisions.sort() prev = None tree = None for rev in revisions: if rev.broken: continue if prev and prev.files_hash == rev.files_hash: continue prev = rev new_tree = TreeNode(rev) if tree: new_tree.parent = tree tree = new_tree return tree def find_merge(self, revision, source_chain): """For a given revision in the target, find the node in the source chain that matches the files""" node = source_chain candidates = [] while node: # exclude reverts happening after the merge if ( node.revision.commit_time <= revision.commit_time and node.revision.files_hash == revision.files_hash ): candidates.append(node) if node.merged_into: # we can't have candidates that are crossing previous merges # see https://src.opensuse.org/importers/git-importer/issues/14 candidates = [] node = node.parent if candidates: # the first candidate is the youngest one that matches the check. That's # good enough. See FastCGI test case for rev 36 and 38: 37 reverted 36 and # then 38 reverting the revert before it was submitted. return candidates[0] def add_merge_points(self, factory_revisions): """For all target revisions that accepted a request, look up the merge points in the source chains (ignoring the actual revision submitted for now)""" class FindRequestsWalker(AbstractWalker): def __init__(self) -> None: super().__init__() self.requests = set() def call(self, node: TreeNode, _: Boolean) -> None: if not node.revision.request_id: return self.requests.add(node.revision.request_id) class FindMergeWalker(AbstractWalker): def __init__(self, builder: TreeBuilder, requests: Dict) -> None: super().__init__() self.source_revisions = dict() self.builder = builder self.requests = requests def call(self, node, is_source) -> None: # not going to happen, but better safe if is_source: return if not node.revision.request_id: return req = self.requests.get(node.revision.request_id) key = f"{req.source_project}/{req.source_package}" if key not in self.source_revisions: self.source_revisions[key] = self.builder.revisions_chain( req.source_project, req.source_package ) node.merged = self.builder.find_merge( node.revision, self.source_revisions[key] ) # add a reverse lookup if node.merged: node.merged.merged_into = node # walk the tree twice. First we collect all requests to be looked up # to avoid going into the DB a thousand times frqs = FindRequestsWalker() factory_revisions.walk(frqs) requests = dict() with self.db.cursor() as cur: cur.execute( "SELECT * from requests WHERE id = ANY(%s)", (list(frqs.requests),) ) for row in cur.fetchall(): req = Request.from_db(row) requests[req.dbid] = req sw = FindMergeWalker(self, requests) factory_revisions.walk(sw) def prune_loose_end(self, factory_node): """Look for source revisions that end in a new root and prune them""" merge_before_last = None last_merge = None while factory_node: if factory_node.merged: source_node = factory_node.merged while source_node: source_node = source_node.parent if source_node and source_node.merged_into: break merge_before_last = last_merge last_merge = factory_node factory_node = factory_node.parent # a package without requests if not last_merge: return if merge_before_last: # we need to find the last merged_into that didn't end nowhere # and cut the rope there node = merge_before_last.merged last_node = None while node: last_node = node node = node.parent if node and node.merged_into: break if last_node: last_node.parent = None if not last_merge.parent: last_merge.parent = last_merge.merged last_merge.merged.merged_into = None last_merge.merged = None def build(self, project, package): """Create a Factory tree (returning the top)""" factory_revisions = self.revisions_chain(project, package) self.add_merge_points(factory_revisions) # factory_revisions.print() self.prune_loose_end(factory_revisions) # factory_revisions.print() return factory_revisions