hg-git-serve: src/hgext3rd/hggit_serve/

comparison src/hgext3rd/hggit_serve/_export.py @ 12:f630d9904ea7

Reorganize project into multiple files.

author	Paul Fisher <paul@pfish.zone>
date	Wed, 18 Feb 2026 16:17:05 -0500
parents	src/hgext3rd/hggit_serve.py@ce204bcc4e04
children	00bdfac5416c

comparison

equal deleted inserted replaced

-:ce204bcc4e04
+:f630d9904ea7
+from __future__ import annotations
+import binascii
+import typing as t
+import dulwich.refs
+import mercurial.error as hgerr
+from hggit import git_handler
+if t.TYPE_CHECKING:
+import mercurial.interfaces.repository as hgrepo
+import mercurial.ui as hgui
+class GittyRepo(hgrepo.IRepo, t.Protocol):
+githandler: git_handler.GitHandler
+def is_gitty(repo: hgrepo.IRepo) -> t.TypeGuard[GittyRepo]:
+"""Ensures that we have hg-git installed and active."""
+return hasattr(repo, 'githandler')
+PULL = b'pull'
+PUSH = b'push'
+SERVICE_PERMISSIONS = {
+b'git-upload-pack': PULL,
+b'git-receive-pack': PUSH,
+}
+"""The Mercurial permission corresponding to each Git action.
+These seem backwards because the direction of up/download is relative to
+the server, so when the client pulls, the server is *uploading*,
+and when the client pushes, the server is *downloading*.
+"""
+#
+# Stuff so that we don't try to export revisions while we're importing.
+#
+_ILEVEL_ATTR = '@hggit_import_level'
+"""An attribute that tracks how many "levels deep" we are into importing.
+We set this on the repository object when we're importing and remove it
+when we're done. It's not just a bool in case somebody sets up some crazy
+recursive hook situation where we start importing inside another import.
+"""
+def importing_enter(repo: hgrepo.IRepo) -> None:
+"""Call this before you start importing from Git."""
+level = getattr(repo, _ILEVEL_ATTR, 0) + 1
+setattr(repo, _ILEVEL_ATTR, level)
+def is_importing(repo: hgrepo.IRepo) -> bool:
+"""Call this to check if you're currently importing."""
+return hasattr(repo, _ILEVEL_ATTR)
+def importing_exit(repo: hgrepo.IRepo) -> None:
+"""Call this after you finish importing from Git."""
+level = getattr(repo, _ILEVEL_ATTR) - 1
+if level:
+setattr(repo, _ILEVEL_ATTR, level)
+else:
+delattr(repo, _ILEVEL_ATTR)
+#
+# Export handling.
+#
+def clean_all_refs(refs: dulwich.refs.RefsContainer) -> None:
+"""Removes all refs from the Git repository."""
+def set_head(ui: hgui.ui, repo: GittyRepo, at_name: bytes) -> None:
+"""Creates a HEAD reference in Git referring to the current HEAD."""
+# By default, we use '@', since that's what will be auto checked out.
+current = b'@'
+if current not in repo._bookmarks:
+current = repo._bookmarks.active or current
+# We'll be moving this (possibly fake) bookmark into Git.
+git_current = current
+if current == b'@':
+# @ is a special keyword in Git, so we can't use it as a bookmark.
+git_current = at_name
+git_branch = dulwich.refs.LOCAL_BRANCH_PREFIX + git_current
+if not dulwich.refs.check_ref_format(git_branch):
+# We can't export this ref to Git. Give up.
+ui.warn(f'{git_branch!r} is not a valid branch name for Git.'.encode())
+return
+try:
+# Maybe this is a real bookmark?
+hgnode = repo._bookmarks[current]
+except KeyError:
+# Not a real bookmark. Assume we want the tip of the current branch.
+branch = repo.dirstate.branch()
+try:
+hgnode = repo.branchtip(branch)
+except hgerr.RepoLookupError:
+# This branch somehow doesn't exist???
+ui.warn(f"{branch!r} doesn't seem to exist?".encode())
+return
+hgsha = binascii.hexlify(hgnode)
+gitsha = repo.githandler.map_git_get(hgsha)
+if not gitsha:
+# No Git SHA to match this Hg sha. Give up.
+ui.warn(f'revision {hgsha!r} was not exported to Git'.encode())
+return
+refs = repo.githandler.git.refs
+refs.add_packed_refs({git_branch: gitsha})
+refs.set_symbolic_ref(b'HEAD', git_branch)
+def fix_refs(ui: hgui.ui, repo: GittyRepo) -> None:
+"""After a git export, fix up the refs.
+This ensures that there are no leftover refs from older, removed bookmarks
+and that there is a proper HEAD set so that cloning works.
+"""
+refs = repo.githandler.git.refs
+# dump to allkeys so we explicitly are iterating over a snapshot
+# and not over something while we mutate
+for ref in refs.allkeys():
+refs.remove_if_equals(ref, None)
+repo.githandler.export_hg_tags()
+repo.githandler.update_references()
+default_branch_name = ui.config(
+b'hggit-serve', b'default-branch', b'default'
+)
+set_head(ui, repo, default_branch_name)
+#
+# Hooks
+#
+def _export_hook(ui: hgui.ui, repo: hgrepo.IRepo, **__: object) -> None:
+"""Maybe exports the repository to get after we get new revs."""
+if not is_gitty(repo):
+return
+auto_export = ui.config(b'hggit-serve', b'auto-export')
+if auto_export == b'never':
+return
+if auto_export == b'always' or git_handler.has_gitrepo(repo):
+if is_importing(repo):
+ui.note(b'currently importing revs from git; not exporting\n')
+return
+repo.githandler.export_commits()
+fix_refs(ui, repo)
+def _fix_refs_hook(ui: hgui.ui, repo: hgrepo.IRepo, **__: object) -> None:
+"""Exports to Git and sets up for serving.  See ``_fix_refs``."""
+if not is_gitty(repo):
+return
+fix_refs(ui, repo)
+#
+# Interfacing with Mercurial
+#
+def uipopulate(ui: hgui.ui) -> None:
+# Fix up our tags after a Git export.
+ui.setconfig(
+b'hooks', b'post-git-export.__gitserve_add_tag__', _fix_refs_hook
+)
+# Whenever we get new revisions, export them to the Git repository.
+ui.setconfig(b'hooks', b'txnclose.__gitserve_export__', _export_hook)
+# Don't step on ourselves when importing data from Git.
+ui.setconfig(
+b'hooks',
+b'pre-git-import.__gitserve_suppress_export__',
+lambda _, repo, **__: importing_enter(repo),
+)
+ui.setconfig(
+b'hooks',
+b'post-git-import.__gitserve_suppress_export__',
+lambda _, repo, **__: importing_exit(repo),
+)

Mercurial > hg-git-serve

comparison src/hgext3rd/hggit_serve/_export.py @ 12:f630d9904ea7