Wrap trees and blobs in Python objects (just like commits were already
wrapped), so that StGit code can read and write them.
Signed-off-by: Karl Hasselström <kha@xxxxxxxxxxx>
---
stgit/lib/git.py | 188 +++++++++++++++++++++++++++++++++++++++++++++++-------
1 files changed, 165 insertions(+), 23 deletions(-)
diff --git a/stgit/lib/git.py b/stgit/lib/git.py
index 6ccdfa7..a8881f4 100644
--- a/stgit/lib/git.py
+++ b/stgit/lib/git.py
@@ -182,16 +182,142 @@ class Person(Immutable, Repr):
defaults = cls.user())
return cls.__committer
-class Tree(Immutable, Repr):
- """Represents a git tree object."""
- def __init__(self, sha1):
+class GitObject(Immutable, Repr):
+ """Base class for all git objects. One git object is represented by at
+ most one C{GitObject}, which makes it possible to compare them
+ using normal Python object comparison; it also ensures we don't
+ waste more memory than necessary."""
+
+class BlobData(Immutable, Repr):
+ """Represents the data contents of a git blob object."""
+ def __init__(self, string):
+ self.__string = str(string)
+ str = property(lambda self: self.__string)
+ def commit(self, repository):
+ """Commit the blob.
+ @return: The committed blob
+ @rtype: L{Blob}"""
+ sha1 = repository.run(['git', 'hash-object', '-w', '--stdin']
+ ).raw_input(self.str).output_one_line()
+ return repository.get_blob(sha1)
+
+class Blob(GitObject):
+ """Represents a git blob object. All the actual data contents of the
+ blob object is stored in the L{data} member, which is a
+ L{BlobData} object."""
+ typename = 'blob'
+ default_perm = '100644'
+ def __init__(self, repository, sha1):
+ self.__repository = repository
self.__sha1 = sha1
sha1 = property(lambda self: self.__sha1)
def __str__(self):
- return 'Tree<%s>' % self.sha1
+ return 'Blob<%s>' % self.sha1
+ @property
+ def data(self):
+ return BlobData(self.__repository.cat_object(self.sha1))
+
+class ImmutableDict(dict):
+ """A dictionary that cannot be modified once it's been created."""
+ def error(*args, **kwargs):
+ raise TypeError('Cannot modify immutable dict')
+ __delitem__ = error
+ __setitem__ = error
+ clear = error
+ pop = error
+ popitem = error
+ setdefault = error
+ update = error
+
+class TreeData(Immutable, Repr):
+ """Represents the data contents of a git tree object."""
+ @staticmethod
+ def __x(po):
+ if isinstance(po, GitObject):
+ perm, object = po.default_perm, po
+ else:
+ perm, object = po
+ return perm, object
+ def __init__(self, entries):
+ """Create a new L{TreeData} object from the given mapping from names
+ (strings) to either (I{permission}, I{object}) tuples or just
+ objects."""
+ self.__entries = ImmutableDict((name, self.__x(po))
+ for (name, po) in entries.iteritems())
+ entries = property(lambda self: self.__entries)
+ """Map from name to (I{permission}, I{object}) tuple."""
+ def set_entry(self, name, po):
+ """Create a new L{TreeData} object identical to this one, except that
+ it maps C{name} to C{po}.
+
+ @param name: Name of the changed mapping
+ @type name: C{str}
+ @param po: Value of the changed mapping
+ @type po: L{Blob} or L{Tree} or (C{str}, L{Blob} or L{Tree})
+ @return: The new L{TreeData} object
+ @rtype: L{TreeData}"""
+ e = dict(self.entries)
+ e[name] = self.__x(po)
+ return type(self)(e)
+ def del_entry(self, name):
+ """Create a new L{TreeData} object identical to this one, except that
+ it doesn't map C{name} to anything.
+
+ @param name: Name of the deleted mapping
+ @type name: C{str}
+ @return: The new L{TreeData} object
+ @rtype: L{TreeData}"""
+ e = dict(self.entries)
+ del e[name]
+ return type(self)(e)
+ def commit(self, repository):
+ """Commit the tree.
+ @return: The committed tree
+ @rtype: L{Tree}"""
+ listing = ''.join(
+ '%s %s %s\t%s\0' % (mode, obj.typename, obj.sha1, name)
+ for (name, (mode, obj)) in self.entries.iteritems())
+ sha1 = repository.run(['git', 'mktree', '-z']
+ ).raw_input(listing).output_one_line()
+ return repository.get_tree(sha1)
+ @classmethod
+ def parse(cls, repository, s):
+ """Parse a raw git tree description.
+
+ @return: A new L{TreeData} object
+ @rtype: L{TreeData}"""
+ entries = {}
+ for line in s.split('\0')[:-1]:
+ m = re.match(r'^([0-7]{6}) ([a-z]+) ([0-9a-f]{40})\t(.*)$', line)
+ assert m
+ perm, type, sha1, name = m.groups()
+ entries[name] = (perm, repository.get_object(type, sha1))
+ return cls(entries)
+
+class Tree(GitObject):
+ """Represents a git tree object. All the actual data contents of the
+ tree object is stored in the L{data} member, which is a
+ L{TreeData} object."""
+ typename = 'tree'
+ default_perm = '040000'
+ def __init__(self, repository, sha1):
+ self.__sha1 = sha1
+ self.__repository = repository
+ self.__data = None
+ sha1 = property(lambda self: self.__sha1)
+ @property
+ def data(self):
+ if self.__data == None:
+ self.__data = TreeData.parse(
+ self.__repository,
+ self.__repository.run(['git', 'ls-tree', '-z', self.sha1]
+ ).raw_output())
+ return self.__data
+ def __str__(self):
+ return 'Tree<sha1: %s>' % self.sha1
class CommitData(Immutable, Repr):
- """Represents the actual data contents of a git commit object."""
+ """Represents the data contents of a git commit object."""
def __init__(self, tree = NoValue, parents = NoValue, author = NoValue,
committer = NoValue, message = NoValue, defaults = NoValue):
d = make_defaults(defaults)
@@ -238,8 +364,30 @@ class CommitData(Immutable, Repr):
return ('CommitData<tree: %s, parents: %s, author: %s,'
' committer: %s, message: "%s">'
) % (tree, parents, self.author, self.committer, self.message)
+ def commit(self, repository):
+ """Commit the commit.
+ @return: The committed commit
+ @rtype: L{Commit}"""
+ c = ['git', 'commit-tree', self.tree.sha1]
+ for p in self.parents:
+ c.append('-p')
+ c.append(p.sha1)
+ env = {}
+ for p, v1 in ((self.author, 'AUTHOR'),
+ (self.committer, 'COMMITTER')):
+ if p != None:
+ for attr, v2 in (('name', 'NAME'), ('email', 'EMAIL'),
+ ('date', 'DATE')):
+ if getattr(p, attr) != None:
+ env['GIT_%s_%s' % (v1, v2)] = str(getattr(p, attr))
+ sha1 = repository.run(c, env = env).raw_input(self.message
+ ).output_one_line()
+ return repository.get_commit(sha1)
@classmethod
def parse(cls, repository, s):
+ """Parse a raw git commit description.
+ @return: A new L{CommitData} object
+ @rtype: L{CommitData}"""
cd = cls(parents = [])
lines = list(s.splitlines(True))
for i in xrange(len(lines)):
@@ -259,10 +407,11 @@ class CommitData(Immutable, Repr):
assert False
assert False
-class Commit(Immutable, Repr):
+class Commit(GitObject):
"""Represents a git commit object. All the actual data contents of the
commit object is stored in the L{data} member, which is a
L{CommitData} object."""
+ typename = 'commit'
def __init__(self, repository, sha1):
self.__sha1 = sha1
self.__repository = repository
@@ -367,7 +516,8 @@ class Repository(RunWithEnv):
def __init__(self, directory):
self.__git_dir = directory
self.__refs = Refs(self)
- self.__trees = ObjectCache(lambda sha1: Tree(sha1))
+ self.__blobs = ObjectCache(lambda sha1: Blob(self, sha1))
+ self.__trees = ObjectCache(lambda sha1: Tree(self, sha1))
self.__commits = ObjectCache(lambda sha1: Commit(self, sha1))
self.__default_index = None
self.__default_worktree = None
@@ -429,26 +579,18 @@ class Repository(RunWithEnv):
).output_one_line())
except run.RunException:
raise RepositoryException('%s: No such revision' % rev)
+ def get_blob(self, sha1):
+ return self.__blobs[sha1]
def get_tree(self, sha1):
return self.__trees[sha1]
def get_commit(self, sha1):
return self.__commits[sha1]
- def commit(self, commitdata):
- c = ['git', 'commit-tree', commitdata.tree.sha1]
- for p in commitdata.parents:
- c.append('-p')
- c.append(p.sha1)
- env = {}
- for p, v1 in ((commitdata.author, 'AUTHOR'),
- (commitdata.committer, 'COMMITTER')):
- if p != None:
- for attr, v2 in (('name', 'NAME'), ('email', 'EMAIL'),
- ('date', 'DATE')):
- if getattr(p, attr) != None:
- env['GIT_%s_%s' % (v1, v2)] = str(getattr(p, attr))
- sha1 = self.run(c, env = env).raw_input(commitdata.message
- ).output_one_line()
- return self.get_commit(sha1)
+ def get_object(self, type, sha1):
+ return { Blob.typename: self.get_blob,
+ Tree.typename: self.get_tree,
+ Commit.typename: self.get_commit }[type](sha1)
+ def commit(self, objectdata):
+ return objectdata.commit(self)
@property
def head_ref(self):
try:
--
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