debugcommands: add a debugpathcopies command
I've been working on storing copy metadata in the changelog instead of
the filelog and this has been useful for debugging.
Do we usually add tests for these?
Differential Revision: https://phab.mercurial-scm.org/D5791
from __future__ import absolute_import
from mercurial.node import hex, nullid
from . import (
basestore,
shallowutil,
)
class unionmetadatastore(basestore.baseunionstore):
def __init__(self, *args, **kwargs):
super(unionmetadatastore, self).__init__(*args, **kwargs)
self.stores = args
self.writestore = kwargs.get(r'writestore')
# If allowincomplete==True then the union store can return partial
# ancestor lists, otherwise it will throw a KeyError if a full
# history can't be found.
self.allowincomplete = kwargs.get(r'allowincomplete', False)
def getancestors(self, name, node, known=None):
"""Returns as many ancestors as we're aware of.
return value: {
node: (p1, p2, linknode, copyfrom),
...
}
"""
if known is None:
known = set()
if node in known:
return []
ancestors = {}
def traverse(curname, curnode):
# TODO: this algorithm has the potential to traverse parts of
# history twice. Ex: with A->B->C->F and A->B->D->F, both D and C
# may be queued as missing, then B and A are traversed for both.
queue = [(curname, curnode)]
missing = []
seen = set()
while queue:
name, node = queue.pop()
if (name, node) in seen:
continue
seen.add((name, node))
value = ancestors.get(node)
if not value:
missing.append((name, node))
continue
p1, p2, linknode, copyfrom = value
if p1 != nullid and p1 not in known:
queue.append((copyfrom or curname, p1))
if p2 != nullid and p2 not in known:
queue.append((curname, p2))
return missing
missing = [(name, node)]
while missing:
curname, curnode = missing.pop()
try:
ancestors.update(self._getpartialancestors(curname, curnode,
known=known))
newmissing = traverse(curname, curnode)
missing.extend(newmissing)
except KeyError:
# If we allow incomplete histories, don't throw.
if not self.allowincomplete:
raise
# If the requested name+node doesn't exist, always throw.
if (curname, curnode) == (name, node):
raise
# TODO: ancestors should probably be (name, node) -> (value)
return ancestors
@basestore.baseunionstore.retriable
def _getpartialancestors(self, name, node, known=None):
for store in self.stores:
try:
return store.getancestors(name, node, known=known)
except KeyError:
pass
raise KeyError((name, hex(node)))
@basestore.baseunionstore.retriable
def getnodeinfo(self, name, node):
for store in self.stores:
try:
return store.getnodeinfo(name, node)
except KeyError:
pass
raise KeyError((name, hex(node)))
def add(self, name, node, data):
raise RuntimeError("cannot add content only to remotefilelog "
"contentstore")
def getmissing(self, keys):
missing = keys
for store in self.stores:
if missing:
missing = store.getmissing(missing)
return missing
def markledger(self, ledger, options=None):
for store in self.stores:
store.markledger(ledger, options)
def getmetrics(self):
metrics = [s.getmetrics() for s in self.stores]
return shallowutil.sumdicts(*metrics)
class remotefilelogmetadatastore(basestore.basestore):
def getancestors(self, name, node, known=None):
"""Returns as many ancestors as we're aware of.
return value: {
node: (p1, p2, linknode, copyfrom),
...
}
"""
data = self._getdata(name, node)
ancestors = shallowutil.ancestormap(data)
return ancestors
def getnodeinfo(self, name, node):
return self.getancestors(name, node)[node]
def add(self, name, node, parents, linknode):
raise RuntimeError("cannot add metadata only to remotefilelog "
"metadatastore")
class remotemetadatastore(object):
def __init__(self, ui, fileservice, shared):
self._fileservice = fileservice
self._shared = shared
def getancestors(self, name, node, known=None):
self._fileservice.prefetch([(name, hex(node))], force=True,
fetchdata=False, fetchhistory=True)
return self._shared.getancestors(name, node, known=known)
def getnodeinfo(self, name, node):
return self.getancestors(name, node)[node]
def add(self, name, node, data):
raise RuntimeError("cannot add to a remote store")
def getmissing(self, keys):
return keys
def markledger(self, ledger, options=None):
pass