Programmatically `git checkout .` with dulwich

Question

Having this code

from dulwich.objects import Blob, Tree, Commit, parse_timezone
from dulwich.repo import Repo
from time import time

repo = Repo.init("myrepo", mkdir=True)
blob = Blob.from_string("my file content\n")
tree = Tree()
tree.add("spam", 0100644, blob.id)
commit = Commit()
commit.tree = tree.id


author = "Flav <[email protected]>"
commit.author = commit.committer = author
commit.commit_time = commit.author_time = int(time())
tz = parse_timezone('+0200')[0]
commit.commit_timezone = commit.author_timezone = tz
commit.encoding = "UTF-8"
commit.message = "initial commit"

o_sto = repo.object_store
o_sto.add_object(blob)
o_sto.add_object(tree)
o_sto.add_object(commit)

repo.refs["HEAD"] = commit.id

I end up with the commit in the history, BUT the created file is pending for deletion (git status says so).

A git checkout . fixes it.

My question is: how to do git checkout . programmatically with dulwich?

Answer 1

Git status says it's deleted because the file doesn't exist in the working copy, that's why checking it out fixes the status.

It looks like there's no support for high-level working copy classes and functions in dulwich yet. You'd have to deal with trees and blobs and unpacking objects.

OK, took the challenge: I could make a basic checkout with Dulwich :

#get repository object of current directory
repo = Repo('.')
#get tree corresponding to the head commit
tree_id = repo["HEAD"].tree
#iterate over tree content, giving path and blob sha.
for entry in repo.object_store.iter_tree_contents(tree_id):
  path = entry.in_path(repo.path).path
  dulwich.file.ensure_dir_exists(os.path.split(path)[0])
  with open(path, 'wb') as file:
    #write blob's content to file
    file.write(repo[entry.sha].as_raw_string()) 

It won't delete files that must be deleted, won't care about your index, etc.
See also Mark Mikofski's github project for more complete code based on this.