forked from adamm/git-importer
215 lines
7.3 KiB
Python
215 lines
7.3 KiB
Python
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
|
|
while node:
|
|
# exclude reverts happening after the merge
|
|
if (
|
|
node.revision.commit_time <= revision.commit_time
|
|
and node.revision.files_hash == revision.files_hash
|
|
):
|
|
return node
|
|
node = node.parent
|
|
|
|
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, package):
|
|
"""Create a Factory tree (returning the top)"""
|
|
factory_revisions = self.revisions_chain("openSUSE:Factory", package)
|
|
self.add_merge_points(factory_revisions)
|
|
# factory_revisions.print()
|
|
self.prune_loose_end(factory_revisions)
|
|
# factory_revisions.print()
|
|
return factory_revisions
|