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Represent git-submodule as nested projects

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We need a representation of git-submodule in repo; otherwise repo will
not sync submodules, and leave workspace in a broken state.  Of course
this will not be a problem if all projects are owned by the owner of the
manifest file, who may simply choose not to use git-submodule in all
projects.  However, this is not possible in practice because manifest
file owner is unlikely to own all upstream projects.

As git submodules are simply git repositories, it is natural to treat
them as plain repo projects that live inside a repo project.  That is,
we could use recursively declared projects to denote the is-submodule
relation of git repositories.

The behavior of repo remains the same to projects that do not have a
sub-project within.  As for parent projects, repo fetches them and their
sub-projects as normal projects, and then checks out subprojects at the
commit specified in parent's commit object.  The sub-project is fetched
at a path relative to parent project's working directory; so the path
specified in manifest file should match that of .gitmodules file.

If a submodule is not registered in repo manifest, repo will derive its
properties from itself and its parent project, which might not always be
correct.  In such cases, the subproject is called a derived subproject.

To a user, a sub-project is merely a git-submodule; so all tips of
working with a git-submodule apply here, too.  For example, you should
not run `repo sync` in a parent repository if its submodule is dirty.

Change-Id: I541e9e2ac1a70304272dbe09724572aa1004eb5c
This commit is contained in:
Che-Liang Chiou 2012-01-11 11:28:42 +08:00
parent 5c6eeac8f0
commit 69998b0c6f
5 changed files with 340 additions and 54 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
command.py
View File

@ -60,6 +60,32 @@ class Command(object):
"""
raise NotImplementedError
def _ResetPathToProjectMap(self, projects):
self._by_path = dict((p.worktree, p) for p in projects)
def _UpdatePathToProjectMap(self, project):
self._by_path[project.worktree] = project
def _GetProjectByPath(self, path):
project = None
if os.path.exists(path):
oldpath = None
while path \
and path != oldpath \
and path != self.manifest.topdir:
try:
project = self._by_path[path]
break
except KeyError:
oldpath = path
path = os.path.dirname(path)
else:
try:
project = self._by_path[path]
except KeyError:
pass
return project
def GetProjects(self, args, missing_ok=False):
"""A list of projects that match the arguments.
"""
@ -74,40 +100,38 @@ class Command(object):
groups = [x for x in re.split('[,\s]+', groups) if x]
if not args:
for project in all_projects.values():
all_projects_list = all_projects.values()
derived_projects = []
for project in all_projects_list:
if project.Registered:
# Do not search registered subproject for derived projects
# since its parent has been searched already
continue
derived_projects.extend(project.GetDerivedSubprojects())
all_projects_list.extend(derived_projects)
for project in all_projects_list:
if ((missing_ok or project.Exists) and
project.MatchesGroups(groups)):
result.append(project)
else:
by_path = None
self._ResetPathToProjectMap(all_projects.values())
for arg in args:
project = all_projects.get(arg)
if not project:
path = os.path.abspath(arg).replace('\\', '/')
project = self._GetProjectByPath(path)
if not by_path:
by_path = dict()
for p in all_projects.values():
by_path[p.worktree] = p
if os.path.exists(path):
oldpath = None
while path \
and path != oldpath \
and path != self.manifest.topdir:
try:
project = by_path[path]
break
except KeyError:
oldpath = path
path = os.path.dirname(path)
else:
try:
project = by_path[path]
except KeyError:
pass
# If it's not a derived project, update path->project mapping and
# search again, as arg might actually point to a derived subproject.
if project and not project.Derived:
search_again = False
for subproject in project.GetDerivedSubprojects():
self._UpdatePathToProjectMap(subproject)
search_again = True
if search_again:
project = self._GetProjectByPath(path) or project
if not project:
raise NoSuchProjectError(arg)

15
docs/manifest-format.txt
View File

@ -45,7 +45,8 @@ following DTD:
<!ELEMENT manifest-server (EMPTY)>
<!ATTLIST url CDATA #REQUIRED>
<!ELEMENT project (annotation?)>
<!ELEMENT project (annotation?,
project*)>
<!ATTLIST project name CDATA #REQUIRED>
<!ATTLIST project path CDATA #IMPLIED>
<!ATTLIST project remote IDREF #IMPLIED>
@ -152,7 +153,10 @@ Element project
One or more project elements may be specified. Each element
describes a single Git repository to be cloned into the repo
client workspace.
client workspace. You may specify Git-submodules by creating a
nested project. Git-submodules will be automatically
recognized and inherit their parent's attributes, but those
may be overridden by an explicitly specified project element.
Attribute `name`: A unique name for this project. The project's
name is appended onto its remote's fetch URL to generate the actual
@ -163,7 +167,8 @@ URL to configure the Git remote with. The URL gets formed as:
where ${remote_fetch} is the remote's fetch attribute and
${project_name} is the project's name attribute. The suffix ".git"
is always appended as repo assumes the upstream is a forest of
bare Git repositories.
bare Git repositories. If the project has a parent element, its
name will be prefixed by the parent's.
The project name must match the name Gerrit knows, if Gerrit is
being used for code reviews.
@ -171,6 +176,8 @@ being used for code reviews.
Attribute `path`: An optional path relative to the top directory
of the repo client where the Git working directory for this project
should be placed. If not supplied the project name is used.
If the project has a parent element, its path will be prefixed
by the parent's.
Attribute `remote`: Name of a previously defined remote element.
If not supplied the remote given by the default element is used.
@ -190,6 +197,8 @@ its name:`name` and path:`path`. E.g. for
definition is implicitly in the following manifest groups:
default, name:monkeys, and path:barrel-of. If you place a project in the
group "notdefault", it will not be automatically downloaded by repo.
If the project has a parent element, the `name` and `path` here
are the prefixed ones.
Element annotation
------------------

98
manifest_xml.py
View File

@ -180,20 +180,25 @@ class XmlManifest(object):
root.appendChild(e)
root.appendChild(doc.createTextNode(''))
sort_projects = list(self.projects.keys())
sort_projects.sort()
for p in sort_projects:
p = self.projects[p]
def output_projects(parent, parent_node, projects):
for p in projects:
output_project(parent, parent_node, self.projects[p])
def output_project(parent, parent_node, p):
if not p.MatchesGroups(groups):
continue
return
name = p.name
relpath = p.relpath
if parent:
name = self._UnjoinName(parent.name, name)
relpath = self._UnjoinRelpath(parent.relpath, relpath)
e = doc.createElement('project')
root.appendChild(e)
e.setAttribute('name', p.name)
if p.relpath != p.name:
e.setAttribute('path', p.relpath)
parent_node.appendChild(e)
e.setAttribute('name', name)
if relpath != name:
e.setAttribute('path', relpath)
if not d.remote or p.remote.name != d.remote.name:
e.setAttribute('remote', p.remote.name)
if peg_rev:
@ -231,6 +236,16 @@ class XmlManifest(object):
if p.sync_c:
e.setAttribute('sync-c', 'true')
if p.subprojects:
sort_projects = [subp.name for subp in p.subprojects]
sort_projects.sort()
output_projects(p, e, sort_projects)
sort_projects = [key for key in self.projects.keys()
if not self.projects[key].parent]
sort_projects.sort()
output_projects(None, root, sort_projects)
if self._repo_hooks_project:
root.appendChild(doc.createTextNode(''))
e = doc.createElement('repo-hooks')
@ -383,11 +398,15 @@ class XmlManifest(object):
for node in itertools.chain(*node_list):
if node.nodeName == 'project':
project = self._ParseProject(node)
def recursively_add_projects(project):
if self._projects.get(project.name):
raise ManifestParseError(
'duplicate project %s in %s' %
(project.name, self.manifestFile))
self._projects[project.name] = project
for subproject in project.subprojects:
recursively_add_projects(subproject)
recursively_add_projects(project)
if node.nodeName == 'repo-hooks':
# Get the name of the project and the (space-separated) list of enabled.
repo_hooks_project = self._reqatt(node, 'in-project')
@ -537,11 +556,19 @@ class XmlManifest(object):
return '\n'.join(cleanLines)
def _ParseProject(self, node):
def _JoinName(self, parent_name, name):
return os.path.join(parent_name, name)
def _UnjoinName(self, parent_name, name):
return os.path.relpath(name, parent_name)
def _ParseProject(self, node, parent = None):
"""
reads a <project> element from the manifest file
"""
name = self._reqatt(node, 'name')
if parent:
name = self._JoinName(parent.name, name)
remote = self._get_remote(node)
if remote is None:
@ -586,37 +613,66 @@ class XmlManifest(object):
groups = node.getAttribute('groups')
groups = [x for x in re.split('[,\s]+', groups) if x]
default_groups = ['all', 'name:%s' % name, 'path:%s' % path]
groups.extend(set(default_groups).difference(groups))
if self.IsMirror:
worktree = None
gitdir = os.path.join(self.topdir, '%s.git' % name)
if parent is None:
relpath, worktree, gitdir = self.GetProjectPaths(name, path)
else:
worktree = os.path.join(self.topdir, path).replace('\\', '/')
gitdir = os.path.join(self.repodir, 'projects/%s.git' % path)
relpath, worktree, gitdir = self.GetSubprojectPaths(parent, path)
default_groups = ['all', 'name:%s' % name, 'path:%s' % relpath]
groups.extend(set(default_groups).difference(groups))
project = Project(manifest = self,
name = name,
remote = remote.ToRemoteSpec(name),
gitdir = gitdir,
worktree = worktree,
relpath = path,
relpath = relpath,
revisionExpr = revisionExpr,
revisionId = None,
rebase = rebase,
groups = groups,
sync_c = sync_c,
upstream = upstream)
upstream = upstream,
parent = parent)
for n in node.childNodes:
if n.nodeName == 'copyfile':
self._ParseCopyFile(project, n)
if n.nodeName == 'annotation':
self._ParseAnnotation(project, n)
if n.nodeName == 'project':
project.subprojects.append(self._ParseProject(n, parent = project))
return project
def GetProjectPaths(self, name, path):
relpath = path
if self.IsMirror:
worktree = None
gitdir = os.path.join(self.topdir, '%s.git' % name)
else:
worktree = os.path.join(self.topdir, path).replace('\\', '/')
gitdir = os.path.join(self.repodir, 'projects', '%s.git' % path)
return relpath, worktree, gitdir
def GetSubprojectName(self, parent, submodule_path):
return os.path.join(parent.name, submodule_path)
def _JoinRelpath(self, parent_relpath, relpath):
return os.path.join(parent_relpath, relpath)
def _UnjoinRelpath(self, parent_relpath, relpath):
return os.path.relpath(relpath, parent_relpath)
def GetSubprojectPaths(self, parent, path):
relpath = self._JoinRelpath(parent.relpath, path)
gitdir = os.path.join(parent.gitdir, 'subprojects', '%s.git' % path)
if self.IsMirror:
worktree = None
else:
worktree = os.path.join(parent.worktree, path).replace('\\', '/')
return relpath, worktree, gitdir
def _ParseCopyFile(self, project, node):
src = self._reqatt(node, 'src')
dest = self._reqatt(node, 'dest')

180
project.py
View File

@ -22,6 +22,7 @@ import shutil
import stat
import subprocess
import sys
import tempfile
import time
from color import Coloring
@ -484,7 +485,28 @@ class Project(object):
rebase = True,
groups = None,
sync_c = False,
upstream = None):
upstream = None,
parent = None,
is_derived = False):
"""Init a Project object.
Args:
manifest: The XmlManifest object.
name: The `name` attribute of manifest.xml's project element.
remote: RemoteSpec object specifying its remote's properties.
gitdir: Absolute path of git directory.
worktree: Absolute path of git working tree.
relpath: Relative path of git working tree to repo's top directory.
revisionExpr: The `revision` attribute of manifest.xml's project element.
revisionId: git commit id for checking out.
rebase: The `rebase` attribute of manifest.xml's project element.
groups: The `groups` attribute of manifest.xml's project element.
sync_c: The `sync-c` attribute of manifest.xml's project element.
upstream: The `upstream` attribute of manifest.xml's project element.
parent: The parent Project object.
is_derived: False if the project was explicitly defined in the manifest;
True if the project is a discovered submodule.
"""
self.manifest = manifest
self.name = name
self.remote = remote
@ -507,6 +529,9 @@ class Project(object):
self.groups = groups
self.sync_c = sync_c
self.upstream = upstream
self.parent = parent
self.is_derived = is_derived
self.subprojects = []
self.snapshots = {}
self.copyfiles = []
@ -526,6 +551,14 @@ class Project(object):
# project containing repo hooks.
self.enabled_repo_hooks = []
@property
def Registered(self):
return self.parent and not self.is_derived
@property
def Derived(self):
return self.is_derived
@property
def Exists(self):
return os.path.isdir(self.gitdir)
@ -1370,6 +1403,151 @@ class Project(object):
return kept
## Submodule Management ##
def GetRegisteredSubprojects(self):
result = []
def rec(subprojects):
if not subprojects:
return
result.extend(subprojects)
for p in subprojects:
rec(p.subprojects)
rec(self.subprojects)
return result
def _GetSubmodules(self):
# Unfortunately we cannot call `git submodule status --recursive` here
# because the working tree might not exist yet, and it cannot be used
# without a working tree in its current implementation.
def get_submodules(gitdir, rev, path):
# Parse .gitmodules for submodule sub_paths and sub_urls
sub_paths, sub_urls = parse_gitmodules(gitdir, rev)
if not sub_paths:
return []
# Run `git ls-tree` to read SHAs of submodule object, which happen to be
# revision of submodule repository
sub_revs = git_ls_tree(gitdir, rev, sub_paths)
submodules = []
for sub_path, sub_url in zip(sub_paths, sub_urls):
try:
sub_rev = sub_revs[sub_path]
except KeyError:
# Ignore non-exist submodules
continue
sub_gitdir = self.manifest.GetSubprojectPaths(self, sub_path)[2]
submodules.append((sub_rev, sub_path, sub_url))
return submodules
re_path = re.compile(r'submodule.(\w+).path')
re_url = re.compile(r'submodule.(\w+).url')
def parse_gitmodules(gitdir, rev):
cmd = ['cat-file', 'blob', '%s:.gitmodules' % rev]
try:
p = GitCommand(None, cmd, capture_stdout = True, capture_stderr = True,
bare = True, gitdir = gitdir)
except GitError as e:
return [], []
if p.Wait() != 0:
return [], []
gitmodules_lines = []
fd, temp_gitmodules_path = tempfile.mkstemp()
try:
os.write(fd, p.stdout)
os.close(fd)
cmd = ['config', '--file', temp_gitmodules_path, '--list']
p = GitCommand(None, cmd, capture_stdout = True, capture_stderr = True,
bare = True, gitdir = gitdir)
if p.Wait() != 0:
return [], []
gitmodules_lines = p.stdout.split('\n')
except GitError as e:
return [], []
finally:
os.remove(temp_gitmodules_path)
names = set()
paths = {}
urls = {}
for line in gitmodules_lines:
if not line:
continue
key, value = line.split('=')
m = re_path.match(key)
if m:
names.add(m.group(1))
paths[m.group(1)] = value
continue
m = re_url.match(key)
if m:
names.add(m.group(1))
urls[m.group(1)] = value
continue
names = sorted(names)
return [paths[name] for name in names], [urls[name] for name in names]
def git_ls_tree(gitdir, rev, paths):
cmd = ['ls-tree', rev, '--']
cmd.extend(paths)
try:
p = GitCommand(None, cmd, capture_stdout = True, capture_stderr = True,
bare = True, gitdir = gitdir)
except GitError:
return []
if p.Wait() != 0:
return []
objects = {}
for line in p.stdout.split('\n'):
if not line.strip():
continue
object_rev, object_path = line.split()[2:4]
objects[object_path] = object_rev
return objects
try:
rev = self.GetRevisionId()
except GitError:
return []
return get_submodules(self.gitdir, rev, '')
def GetDerivedSubprojects(self):
result = []
if not self.Exists:
# If git repo does not exist yet, querying its submodules will
# mess up its states; so return here.
return result
for rev, path, url in self._GetSubmodules():
name = self.manifest.GetSubprojectName(self, path)
project = self.manifest.projects.get(name)
if project and project.Registered:
# If it has been registered, skip it because we are searching
# derived subprojects, but search for its derived subprojects.
result.extend(project.GetDerivedSubprojects())
continue
relpath, worktree, gitdir = self.manifest.GetSubprojectPaths(self, path)
remote = RemoteSpec(self.remote.name,
url = url,
review = self.remote.review)
subproject = Project(manifest = self.manifest,
name = name,
remote = remote,
gitdir = gitdir,
worktree = worktree,
relpath = relpath,
revisionExpr = self.revisionExpr,
revisionId = rev,
rebase = self.rebase,
groups = self.groups,
sync_c = self.sync_c,
parent = self,
is_derived = True)
result.append(subproject)
result.extend(subproject.GetDerivedSubprojects())
return result
## Direct Git Commands ##
def _RemoteFetch(self, name=None,

21
subcmds/sync.py
View File

@ -503,12 +503,31 @@ uncommitted changes are present' % project.relpath
to_fetch.append(rp)
to_fetch.extend(all_projects)
self._Fetch(to_fetch, opt)
fetched = self._Fetch(to_fetch, opt)
_PostRepoFetch(rp, opt.no_repo_verify)
if opt.network_only:
# bail out now; the rest touches the working tree
return
# Iteratively fetch missing and/or nested unregistered submodules
previously_missing_set = set()
while True:
self.manifest._Unload()
all = self.GetProjects(args, missing_ok=True)
missing = []
for project in all:
if project.gitdir not in fetched:
missing.append(project)
if not missing:
break
# Stop us from non-stopped fetching actually-missing repos: If set of
# missing repos has not been changed from last fetch, we break.
missing_set = set(p.name for p in missing)
if previously_missing_set == missing_set:
break
previously_missing_set = missing_set
fetched.update(self._Fetch(missing, opt))
if self.manifest.IsMirror:
# bail out now, we have no working tree
return