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import collections
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import os
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import sqlite3
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from mercurial.i18n import _
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from mercurial.node import sha1nodeconstants
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from mercurial import (
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encoding,
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error,
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pycompat,
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)
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from . import gitutil
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pygit2 = gitutil.get_pygit2()
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_CURRENT_SCHEMA_VERSION = 1
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_SCHEMA = (
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"""
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CREATE TABLE refs (
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-- node and name are unique together. There may be more than one name for
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-- a given node, and there may be no name at all for a given node (in the
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-- case of an anonymous hg head).
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node TEXT NOT NULL,
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name TEXT
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);
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-- The "possible heads" of the repository, which we use to figure out
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-- if we need to re-walk the changelog.
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CREATE TABLE possible_heads (
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node TEXT NOT NULL
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);
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-- The topological heads of the changelog, which hg depends on.
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CREATE TABLE heads (
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node TEXT NOT NULL
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);
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-- A total ordering of the changelog
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CREATE TABLE changelog (
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rev INTEGER NOT NULL PRIMARY KEY,
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node TEXT NOT NULL,
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p1 TEXT,
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p2 TEXT
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);
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CREATE UNIQUE INDEX changelog_node_idx ON changelog(node);
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CREATE UNIQUE INDEX changelog_node_rev_idx ON changelog(rev, node);
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-- Changed files for each commit, which lets us dynamically build
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-- filelogs.
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CREATE TABLE changedfiles (
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node TEXT NOT NULL,
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filename TEXT NOT NULL,
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-- 40 zeroes for deletions
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filenode TEXT NOT NULL,
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-- to handle filelog parentage:
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p1node TEXT,
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p1filenode TEXT,
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p2node TEXT,
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p2filenode TEXT
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);
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CREATE INDEX changedfiles_nodes_idx
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ON changedfiles(node);
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PRAGMA user_version=%d
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"""
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% _CURRENT_SCHEMA_VERSION
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)
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def _createdb(path):
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# print('open db', path)
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# import traceback
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# traceback.print_stack()
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db = sqlite3.connect(encoding.strfromlocal(path))
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db.text_factory = bytes
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res = db.execute('PRAGMA user_version').fetchone()[0]
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# New database.
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if res == 0:
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for statement in _SCHEMA.split(';'):
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db.execute(statement.strip())
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db.commit()
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elif res == _CURRENT_SCHEMA_VERSION:
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pass
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else:
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raise error.Abort(_(b'sqlite database has unrecognized version'))
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db.execute('PRAGMA journal_mode=WAL')
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return db
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_OUR_ORDER = ()
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if pygit2:
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_OUR_ORDER = (
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pygit2.GIT_SORT_TOPOLOGICAL
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| pygit2.GIT_SORT_TIME
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| pygit2.GIT_SORT_REVERSE
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)
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_DIFF_FLAGS = 1 << 21 # GIT_DIFF_FORCE_BINARY, which isn't exposed by pygit2
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def _find_nearest_ancestor_introducing_node(
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db, gitrepo, file_path, walk_start, filenode
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):
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"""Find the nearest ancestor that introduces a file node.
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Args:
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db: a handle to our sqlite database.
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gitrepo: A pygit2.Repository instance.
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file_path: the path of a file in the repo
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walk_start: a pygit2.Oid that is a commit where we should start walking
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for our nearest ancestor.
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Returns:
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A hexlified SHA that is the commit ID of the next-nearest parent.
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"""
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assert isinstance(file_path, str), 'file_path must be str, got %r' % type(
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file_path
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)
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assert isinstance(filenode, str), 'filenode must be str, got %r' % type(
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filenode
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)
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parent_options = {
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row[0].decode('ascii')
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for row in db.execute(
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'SELECT node FROM changedfiles '
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'WHERE filename = ? AND filenode = ?',
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(file_path, filenode),
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)
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}
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inner_walker = gitrepo.walk(walk_start, _OUR_ORDER)
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for w in inner_walker:
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if w.id.hex in parent_options:
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return w.id.hex
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raise error.ProgrammingError(
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'Unable to find introducing commit for %s node %s from %s',
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(file_path, filenode, walk_start),
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)
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def fill_in_filelog(gitrepo, db, startcommit, path, startfilenode):
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"""Given a starting commit and path, fill in a filelog's parent pointers.
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Args:
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gitrepo: a pygit2.Repository
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db: a handle to our sqlite database
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startcommit: a hexlified node id for the commit to start at
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path: the path of the file whose parent pointers we should fill in.
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filenode: the hexlified node id of the file at startcommit
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TODO: make filenode optional
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"""
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assert isinstance(
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startcommit, str
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), 'startcommit must be str, got %r' % type(startcommit)
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assert isinstance(
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startfilenode, str
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), 'startfilenode must be str, got %r' % type(startfilenode)
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visit = collections.deque([(startcommit, startfilenode)])
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while visit:
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cnode, filenode = visit.popleft()
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commit = gitrepo[cnode]
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parents = []
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for parent in commit.parents:
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t = parent.tree
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for comp in path.split('/'):
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try:
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t = gitrepo[t[comp].id]
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except KeyError:
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break
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else:
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introducer = _find_nearest_ancestor_introducing_node(
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db, gitrepo, path, parent.id, t.id.hex
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)
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parents.append((introducer, t.id.hex))
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p1node = p1fnode = p2node = p2fnode = gitutil.nullgit
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for par, parfnode in parents:
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found = int(
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db.execute(
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'SELECT COUNT(*) FROM changedfiles WHERE '
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'node = ? AND filename = ? AND filenode = ? AND '
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'p1node NOT NULL',
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(par, path, parfnode),
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).fetchone()[0]
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)
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if found == 0:
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assert par is not None
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visit.append((par, parfnode))
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if parents:
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p1node, p1fnode = parents[0]
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if len(parents) == 2:
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p2node, p2fnode = parents[1]
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if len(parents) > 2:
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raise error.ProgrammingError(
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b"git support can't handle octopus merges"
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)
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db.execute(
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'UPDATE changedfiles SET '
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'p1node = ?, p1filenode = ?, p2node = ?, p2filenode = ? '
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'WHERE node = ? AND filename = ? AND filenode = ?',
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(p1node, p1fnode, p2node, p2fnode, commit.id.hex, path, filenode),
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)
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db.commit()
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def _index_repo(
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gitrepo,
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db,
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logfn=lambda x: None,
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progress_factory=lambda *args, **kwargs: None,
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):
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# Identify all references so we can tell the walker to visit all of them.
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all_refs = gitrepo.listall_references()
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possible_heads = set()
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prog = progress_factory(b'refs')
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for pos, ref in enumerate(all_refs):
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if prog is not None:
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prog.update(pos)
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if not (
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ref.startswith('refs/heads/') # local branch
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or ref.startswith('refs/tags/') # tag
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or ref.startswith('refs/remotes/') # remote branch
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or ref.startswith('refs/hg/') # from this extension
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):
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continue
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try:
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start = gitrepo.lookup_reference(ref).peel(pygit2.GIT_OBJ_COMMIT)
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except ValueError:
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# No commit to be found, so we don't care for hg's purposes.
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continue
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possible_heads.add(start.id)
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# Optimization: if the list of heads hasn't changed, don't
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# reindex, the changelog. This doesn't matter on small
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# repositories, but on even moderately deep histories (eg cpython)
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# this is a very important performance win.
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#
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# TODO: we should figure out how to incrementally index history
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# (preferably by detecting rewinds!) so that we don't have to do a
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# full changelog walk every time a new commit is created.
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cache_heads = {
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pycompat.sysstr(x[0])
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for x in db.execute('SELECT node FROM possible_heads')
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}
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walker = None
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cur_cache_heads = {h.hex for h in possible_heads}
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if cur_cache_heads == cache_heads:
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return
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logfn(b'heads mismatch, rebuilding dagcache\n')
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for start in possible_heads:
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if walker is None:
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walker = gitrepo.walk(start, _OUR_ORDER)
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else:
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walker.push(start)
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# Empty out the existing changelog. Even for large-ish histories
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# we can do the top-level "walk all the commits" dance very
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# quickly as long as we don't need to figure out the changed files
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# list.
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db.execute('DELETE FROM changelog')
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if prog is not None:
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prog.complete()
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prog = progress_factory(b'commits')
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# This walker is sure to visit all the revisions in history, but
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# only once.
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for pos, commit in enumerate(walker):
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if prog is not None:
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prog.update(pos)
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p1 = p2 = gitutil.nullgit
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if len(commit.parents) > 2:
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raise error.ProgrammingError(
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(
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b"git support can't handle octopus merges, "
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b"found a commit with %d parents :("
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)
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% len(commit.parents)
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)
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if commit.parents:
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p1 = commit.parents[0].id.hex
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if len(commit.parents) == 2:
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p2 = commit.parents[1].id.hex
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db.execute(
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'INSERT INTO changelog (rev, node, p1, p2) VALUES(?, ?, ?, ?)',
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(pos, commit.id.hex, p1, p2),
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)
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num_changedfiles = db.execute(
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"SELECT COUNT(*) from changedfiles WHERE node = ?",
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(commit.id.hex,),
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).fetchone()[0]
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if not num_changedfiles:
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files = {}
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# I *think* we only need to check p1 for changed files
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# (and therefore linkrevs), because any node that would
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# actually have this commit as a linkrev would be
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# completely new in this rev.
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p1 = commit.parents[0].id.hex if commit.parents else None
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if p1 is not None:
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patchgen = gitrepo.diff(p1, commit.id.hex, flags=_DIFF_FLAGS)
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else:
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patchgen = commit.tree.diff_to_tree(
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swap=True, flags=_DIFF_FLAGS
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)
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new_files = (p.delta.new_file for p in patchgen)
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files = {
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nf.path: nf.id.hex
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for nf in new_files
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if nf.id.raw != sha1nodeconstants.nullid
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}
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for p, n in files.items():
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# We intentionally set NULLs for any file parentage
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# information so it'll get demand-computed later. We
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# used to do it right here, and it was _very_ slow.
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db.execute(
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'INSERT INTO changedfiles ('
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'node, filename, filenode, p1node, p1filenode, p2node, '
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'p2filenode) VALUES(?, ?, ?, ?, ?, ?, ?)',
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(commit.id.hex, p, n, None, None, None, None),
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)
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db.execute('DELETE FROM heads')
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db.execute('DELETE FROM possible_heads')
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for hid in possible_heads:
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h = hid.hex
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db.execute('INSERT INTO possible_heads (node) VALUES(?)', (h,))
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haschild = db.execute(
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'SELECT COUNT(*) FROM changelog WHERE p1 = ? OR p2 = ?', (h, h)
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).fetchone()[0]
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if not haschild:
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db.execute('INSERT INTO heads (node) VALUES(?)', (h,))
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db.commit()
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if prog is not None:
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prog.complete()
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def get_index(
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gitrepo, logfn=lambda x: None, progress_factory=lambda *args, **kwargs: None
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):
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cachepath = os.path.join(
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pycompat.fsencode(gitrepo.path), b'..', b'.hg', b'cache'
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)
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if not os.path.exists(cachepath):
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os.makedirs(cachepath)
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dbpath = os.path.join(cachepath, b'git-commits.sqlite')
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db = _createdb(dbpath)
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# TODO check against gitrepo heads before doing a full index
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# TODO thread a ui.progress call into this layer
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_index_repo(gitrepo, db, logfn, progress_factory)
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return db
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